'use strict';

var stream = require('stream');
var zlib = require('zlib');
var CryptoJS = require('crypto-js');
var fs = require('fs');
var fontkit = require('fontkit');
var events = require('events');
var LineBreaker = require('linebreak');
var exif = require('jpeg-exif');
var PNG = require('png-js');

/*
PDFAbstractReference - abstract class for PDF reference
*/

class PDFAbstractReference {
  toString() {
    throw new Error('Must be implemented by subclasses');
  }
}

/*
PDFTree - abstract base class for name and number tree objects
*/
class PDFTree {
  constructor(options = {}) {
    this._items = {};
    // disable /Limits output for this tree
    this.limits = typeof options.limits === 'boolean' ? options.limits : true;
  }
  add(key, val) {
    return this._items[key] = val;
  }
  get(key) {
    return this._items[key];
  }
  toString() {
    // Needs to be sorted by key
    const sortedKeys = Object.keys(this._items).sort((a, b) => this._compareKeys(a, b));
    const out = ['<<'];
    if (this.limits && sortedKeys.length > 1) {
      const first = sortedKeys[0],
        last = sortedKeys[sortedKeys.length - 1];
      out.push(`  /Limits ${PDFObject.convert([this._dataForKey(first), this._dataForKey(last)])}`);
    }
    out.push(`  /${this._keysName()} [`);
    for (let key of sortedKeys) {
      out.push(`    ${PDFObject.convert(this._dataForKey(key))} ${PDFObject.convert(this._items[key])}`);
    }
    out.push(']');
    out.push('>>');
    return out.join('\n');
  }
  _compareKeys( /*a, b*/
  ) {
    throw new Error('Must be implemented by subclasses');
  }
  _keysName() {
    throw new Error('Must be implemented by subclasses');
  }
  _dataForKey( /*k*/
  ) {
    throw new Error('Must be implemented by subclasses');
  }
}

/*
PDFObject - converts JavaScript types into their corresponding PDF types.
By Devon Govett
*/
const pad = (str, length) => (Array(length + 1).join('0') + str).slice(-length);
const escapableRe = /[\n\r\t\b\f()\\]/g;
const escapable = {
  '\n': '\\n',
  '\r': '\\r',
  '\t': '\\t',
  '\b': '\\b',
  '\f': '\\f',
  '\\': '\\\\',
  '(': '\\(',
  ')': '\\)'
};

// Convert little endian UTF-16 to big endian
const swapBytes = function (buff) {
  const l = buff.length;
  if (l & 0x01) {
    throw new Error('Buffer length must be even');
  } else {
    for (let i = 0, end = l - 1; i < end; i += 2) {
      const a = buff[i];
      buff[i] = buff[i + 1];
      buff[i + 1] = a;
    }
  }
  return buff;
};
class PDFObject {
  static convert(object, encryptFn = null) {
    // String literals are converted to the PDF name type
    if (typeof object === 'string') {
      return `/${object}`;

      // String objects are converted to PDF strings (UTF-16)
    } else if (object instanceof String) {
      let string = object;
      // Detect if this is a unicode string
      let isUnicode = false;
      for (let i = 0, end = string.length; i < end; i++) {
        if (string.charCodeAt(i) > 0x7f) {
          isUnicode = true;
          break;
        }
      }

      // If so, encode it as big endian UTF-16
      let stringBuffer;
      if (isUnicode) {
        stringBuffer = swapBytes(Buffer.from(`\ufeff${string}`, 'utf16le'));
      } else {
        stringBuffer = Buffer.from(string.valueOf(), 'ascii');
      }

      // Encrypt the string when necessary
      if (encryptFn) {
        string = encryptFn(stringBuffer).toString('binary');
      } else {
        string = stringBuffer.toString('binary');
      }

      // Escape characters as required by the spec
      string = string.replace(escapableRe, c => escapable[c]);
      return `(${string})`;

      // Buffers are converted to PDF hex strings
    } else if (Buffer.isBuffer(object)) {
      return `<${object.toString('hex')}>`;
    } else if (object instanceof PDFAbstractReference || object instanceof PDFTree) {
      return object.toString();
    } else if (object instanceof Date) {
      let string = `D:${pad(object.getUTCFullYear(), 4)}` + pad(object.getUTCMonth() + 1, 2) + pad(object.getUTCDate(), 2) + pad(object.getUTCHours(), 2) + pad(object.getUTCMinutes(), 2) + pad(object.getUTCSeconds(), 2) + 'Z';

      // Encrypt the string when necessary
      if (encryptFn) {
        string = encryptFn(Buffer.from(string, 'ascii')).toString('binary');

        // Escape characters as required by the spec
        string = string.replace(escapableRe, c => escapable[c]);
      }
      return `(${string})`;
    } else if (Array.isArray(object)) {
      const items = object.map(e => PDFObject.convert(e, encryptFn)).join(' ');
      return `[${items}]`;
    } else if ({}.toString.call(object) === '[object Object]') {
      const out = ['<<'];
      for (let key in object) {
        const val = object[key];
        out.push(`/${key} ${PDFObject.convert(val, encryptFn)}`);
      }
      out.push('>>');
      return out.join('\n');
    } else if (typeof object === 'number') {
      return PDFObject.number(object);
    } else {
      return `${object}`;
    }
  }
  static number(n) {
    if (n > -1e21 && n < 1e21) {
      return Math.round(n * 1e6) / 1e6;
    }
    throw new Error(`unsupported number: ${n}`);
  }
}

/*
PDFReference - represents a reference to another object in the PDF object heirarchy
By Devon Govett
*/
class PDFReference extends PDFAbstractReference {
  constructor(document, id, data = {}) {
    super();
    this.document = document;
    this.id = id;
    this.data = data;
    this.gen = 0;
    this.compress = this.document.compress && !this.data.Filter;
    this.uncompressedLength = 0;
    this.buffer = [];
  }
  write(chunk) {
    if (!Buffer.isBuffer(chunk)) {
      chunk = Buffer.from(chunk + '\n', 'binary');
    }
    this.uncompressedLength += chunk.length;
    if (this.data.Length == null) {
      this.data.Length = 0;
    }
    this.buffer.push(chunk);
    this.data.Length += chunk.length;
    if (this.compress) {
      return this.data.Filter = 'FlateDecode';
    }
  }
  end(chunk) {
    if (chunk) {
      this.write(chunk);
    }
    return this.finalize();
  }
  finalize() {
    this.offset = this.document._offset;
    const encryptFn = this.document._security ? this.document._security.getEncryptFn(this.id, this.gen) : null;
    if (this.buffer.length) {
      this.buffer = Buffer.concat(this.buffer);
      if (this.compress) {
        this.buffer = zlib.deflateSync(this.buffer);
      }
      if (encryptFn) {
        this.buffer = encryptFn(this.buffer);
      }
      this.data.Length = this.buffer.length;
    }
    this.document._write(`${this.id} ${this.gen} obj`);
    this.document._write(PDFObject.convert(this.data, encryptFn));
    if (this.buffer.length) {
      this.document._write('stream');
      this.document._write(this.buffer);
      this.buffer = []; // free up memory
      this.document._write('\nendstream');
    }
    this.document._write('endobj');
    this.document._refEnd(this);
  }
  toString() {
    return `${this.id} ${this.gen} R`;
  }
}

/*
PDFPage - represents a single page in the PDF document
By Devon Govett
*/

const DEFAULT_MARGINS = {
  top: 72,
  left: 72,
  bottom: 72,
  right: 72
};
const SIZES = {
  '4A0': [4767.87, 6740.79],
  '2A0': [3370.39, 4767.87],
  A0: [2383.94, 3370.39],
  A1: [1683.78, 2383.94],
  A2: [1190.55, 1683.78],
  A3: [841.89, 1190.55],
  A4: [595.28, 841.89],
  A5: [419.53, 595.28],
  A6: [297.64, 419.53],
  A7: [209.76, 297.64],
  A8: [147.4, 209.76],
  A9: [104.88, 147.4],
  A10: [73.7, 104.88],
  B0: [2834.65, 4008.19],
  B1: [2004.09, 2834.65],
  B2: [1417.32, 2004.09],
  B3: [1000.63, 1417.32],
  B4: [708.66, 1000.63],
  B5: [498.9, 708.66],
  B6: [354.33, 498.9],
  B7: [249.45, 354.33],
  B8: [175.75, 249.45],
  B9: [124.72, 175.75],
  B10: [87.87, 124.72],
  C0: [2599.37, 3676.54],
  C1: [1836.85, 2599.37],
  C2: [1298.27, 1836.85],
  C3: [918.43, 1298.27],
  C4: [649.13, 918.43],
  C5: [459.21, 649.13],
  C6: [323.15, 459.21],
  C7: [229.61, 323.15],
  C8: [161.57, 229.61],
  C9: [113.39, 161.57],
  C10: [79.37, 113.39],
  RA0: [2437.8, 3458.27],
  RA1: [1729.13, 2437.8],
  RA2: [1218.9, 1729.13],
  RA3: [864.57, 1218.9],
  RA4: [609.45, 864.57],
  SRA0: [2551.18, 3628.35],
  SRA1: [1814.17, 2551.18],
  SRA2: [1275.59, 1814.17],
  SRA3: [907.09, 1275.59],
  SRA4: [637.8, 907.09],
  EXECUTIVE: [521.86, 756.0],
  FOLIO: [612.0, 936.0],
  LEGAL: [612.0, 1008.0],
  LETTER: [612.0, 792.0],
  TABLOID: [792.0, 1224.0]
};
class PDFPage {
  constructor(document, options = {}) {
    this.document = document;
    this.size = options.size || 'letter';
    this.layout = options.layout || 'portrait';

    // process margins
    if (typeof options.margin === 'number') {
      this.margins = {
        top: options.margin,
        left: options.margin,
        bottom: options.margin,
        right: options.margin
      };

      // default to 1 inch margins
    } else {
      this.margins = options.margins || DEFAULT_MARGINS;
    }

    // calculate page dimensions
    const dimensions = Array.isArray(this.size) ? this.size : SIZES[this.size.toUpperCase()];
    this.width = dimensions[this.layout === 'portrait' ? 0 : 1];
    this.height = dimensions[this.layout === 'portrait' ? 1 : 0];
    this.content = this.document.ref();

    // Initialize the Font, XObject, and ExtGState dictionaries
    this.resources = this.document.ref({
      ProcSet: ['PDF', 'Text', 'ImageB', 'ImageC', 'ImageI']
    });

    // The page dictionary
    this.dictionary = this.document.ref({
      Type: 'Page',
      Parent: this.document._root.data.Pages,
      MediaBox: [0, 0, this.width, this.height],
      Contents: this.content,
      Resources: this.resources
    });
    this.markings = [];
  }

  // Lazily create these objects
  get fonts() {
    const data = this.resources.data;
    return data.Font != null ? data.Font : data.Font = {};
  }
  get xobjects() {
    const data = this.resources.data;
    return data.XObject != null ? data.XObject : data.XObject = {};
  }
  get ext_gstates() {
    const data = this.resources.data;
    return data.ExtGState != null ? data.ExtGState : data.ExtGState = {};
  }
  get patterns() {
    const data = this.resources.data;
    return data.Pattern != null ? data.Pattern : data.Pattern = {};
  }
  get colorSpaces() {
    const data = this.resources.data;
    return data.ColorSpace || (data.ColorSpace = {});
  }
  get annotations() {
    const data = this.dictionary.data;
    return data.Annots != null ? data.Annots : data.Annots = [];
  }
  get structParentTreeKey() {
    const data = this.dictionary.data;
    return data.StructParents != null ? data.StructParents : data.StructParents = this.document.createStructParentTreeNextKey();
  }
  maxY() {
    return this.height - this.margins.bottom;
  }
  write(chunk) {
    return this.content.write(chunk);
  }
  end() {
    this.dictionary.end();
    this.resources.end();
    return this.content.end();
  }
}

/*
PDFNameTree - represents a name tree object
*/
class PDFNameTree extends PDFTree {
  _compareKeys(a, b) {
    return a.localeCompare(b);
  }
  _keysName() {
    return "Names";
  }
  _dataForKey(k) {
    return new String(k);
  }
}

/**
 * Check if value is in a range group.
 * @param {number} value
 * @param {number[]} rangeGroup
 * @returns {boolean}
 */
function inRange(value, rangeGroup) {
  if (value < rangeGroup[0]) return false;
  let startRange = 0;
  let endRange = rangeGroup.length / 2;
  while (startRange <= endRange) {
    const middleRange = Math.floor((startRange + endRange) / 2);

    // actual array index
    const arrayIndex = middleRange * 2;

    // Check if value is in range pointed by actual index
    if (value >= rangeGroup[arrayIndex] && value <= rangeGroup[arrayIndex + 1]) {
      return true;
    }
    if (value > rangeGroup[arrayIndex + 1]) {
      // Search Right Side Of Array
      startRange = middleRange + 1;
    } else {
      // Search Left Side Of Array
      endRange = middleRange - 1;
    }
  }
  return false;
}

// prettier-ignore-start
/**
 * A.1 Unassigned code points in Unicode 3.2
 * @link https://tools.ietf.org/html/rfc3454#appendix-A.1
 */
const unassigned_code_points = [0x0221, 0x0221, 0x0234, 0x024f, 0x02ae, 0x02af, 0x02ef, 0x02ff, 0x0350, 0x035f, 0x0370, 0x0373, 0x0376, 0x0379, 0x037b, 0x037d, 0x037f, 0x0383, 0x038b, 0x038b, 0x038d, 0x038d, 0x03a2, 0x03a2, 0x03cf, 0x03cf, 0x03f7, 0x03ff, 0x0487, 0x0487, 0x04cf, 0x04cf, 0x04f6, 0x04f7, 0x04fa, 0x04ff, 0x0510, 0x0530, 0x0557, 0x0558, 0x0560, 0x0560, 0x0588, 0x0588, 0x058b, 0x0590, 0x05a2, 0x05a2, 0x05ba, 0x05ba, 0x05c5, 0x05cf, 0x05eb, 0x05ef, 0x05f5, 0x060b, 0x060d, 0x061a, 0x061c, 0x061e, 0x0620, 0x0620, 0x063b, 0x063f, 0x0656, 0x065f, 0x06ee, 0x06ef, 0x06ff, 0x06ff, 0x070e, 0x070e, 0x072d, 0x072f, 0x074b, 0x077f, 0x07b2, 0x0900, 0x0904, 0x0904, 0x093a, 0x093b, 0x094e, 0x094f, 0x0955, 0x0957, 0x0971, 0x0980, 0x0984, 0x0984, 0x098d, 0x098e, 0x0991, 0x0992, 0x09a9, 0x09a9, 0x09b1, 0x09b1, 0x09b3, 0x09b5, 0x09ba, 0x09bb, 0x09bd, 0x09bd, 0x09c5, 0x09c6, 0x09c9, 0x09ca, 0x09ce, 0x09d6, 0x09d8, 0x09db, 0x09de, 0x09de, 0x09e4, 0x09e5, 0x09fb, 0x0a01, 0x0a03, 0x0a04, 0x0a0b, 0x0a0e, 0x0a11, 0x0a12, 0x0a29, 0x0a29, 0x0a31, 0x0a31, 0x0a34, 0x0a34, 0x0a37, 0x0a37, 0x0a3a, 0x0a3b, 0x0a3d, 0x0a3d, 0x0a43, 0x0a46, 0x0a49, 0x0a4a, 0x0a4e, 0x0a58, 0x0a5d, 0x0a5d, 0x0a5f, 0x0a65, 0x0a75, 0x0a80, 0x0a84, 0x0a84, 0x0a8c, 0x0a8c, 0x0a8e, 0x0a8e, 0x0a92, 0x0a92, 0x0aa9, 0x0aa9, 0x0ab1, 0x0ab1, 0x0ab4, 0x0ab4, 0x0aba, 0x0abb, 0x0ac6, 0x0ac6, 0x0aca, 0x0aca, 0x0ace, 0x0acf, 0x0ad1, 0x0adf, 0x0ae1, 0x0ae5, 0x0af0, 0x0b00, 0x0b04, 0x0b04, 0x0b0d, 0x0b0e, 0x0b11, 0x0b12, 0x0b29, 0x0b29, 0x0b31, 0x0b31, 0x0b34, 0x0b35, 0x0b3a, 0x0b3b, 0x0b44, 0x0b46, 0x0b49, 0x0b4a, 0x0b4e, 0x0b55, 0x0b58, 0x0b5b, 0x0b5e, 0x0b5e, 0x0b62, 0x0b65, 0x0b71, 0x0b81, 0x0b84, 0x0b84, 0x0b8b, 0x0b8d, 0x0b91, 0x0b91, 0x0b96, 0x0b98, 0x0b9b, 0x0b9b, 0x0b9d, 0x0b9d, 0x0ba0, 0x0ba2, 0x0ba5, 0x0ba7, 0x0bab, 0x0bad, 0x0bb6, 0x0bb6, 0x0bba, 0x0bbd, 0x0bc3, 0x0bc5, 0x0bc9, 0x0bc9, 0x0bce, 0x0bd6, 0x0bd8, 0x0be6, 0x0bf3, 0x0c00, 0x0c04, 0x0c04, 0x0c0d, 0x0c0d, 0x0c11, 0x0c11, 0x0c29, 0x0c29, 0x0c34, 0x0c34, 0x0c3a, 0x0c3d, 0x0c45, 0x0c45, 0x0c49, 0x0c49, 0x0c4e, 0x0c54, 0x0c57, 0x0c5f, 0x0c62, 0x0c65, 0x0c70, 0x0c81, 0x0c84, 0x0c84, 0x0c8d, 0x0c8d, 0x0c91, 0x0c91, 0x0ca9, 0x0ca9, 0x0cb4, 0x0cb4, 0x0cba, 0x0cbd, 0x0cc5, 0x0cc5, 0x0cc9, 0x0cc9, 0x0cce, 0x0cd4, 0x0cd7, 0x0cdd, 0x0cdf, 0x0cdf, 0x0ce2, 0x0ce5, 0x0cf0, 0x0d01, 0x0d04, 0x0d04, 0x0d0d, 0x0d0d, 0x0d11, 0x0d11, 0x0d29, 0x0d29, 0x0d3a, 0x0d3d, 0x0d44, 0x0d45, 0x0d49, 0x0d49, 0x0d4e, 0x0d56, 0x0d58, 0x0d5f, 0x0d62, 0x0d65, 0x0d70, 0x0d81, 0x0d84, 0x0d84, 0x0d97, 0x0d99, 0x0db2, 0x0db2, 0x0dbc, 0x0dbc, 0x0dbe, 0x0dbf, 0x0dc7, 0x0dc9, 0x0dcb, 0x0dce, 0x0dd5, 0x0dd5, 0x0dd7, 0x0dd7, 0x0de0, 0x0df1, 0x0df5, 0x0e00, 0x0e3b, 0x0e3e, 0x0e5c, 0x0e80, 0x0e83, 0x0e83, 0x0e85, 0x0e86, 0x0e89, 0x0e89, 0x0e8b, 0x0e8c, 0x0e8e, 0x0e93, 0x0e98, 0x0e98, 0x0ea0, 0x0ea0, 0x0ea4, 0x0ea4, 0x0ea6, 0x0ea6, 0x0ea8, 0x0ea9, 0x0eac, 0x0eac, 0x0eba, 0x0eba, 0x0ebe, 0x0ebf, 0x0ec5, 0x0ec5, 0x0ec7, 0x0ec7, 0x0ece, 0x0ecf, 0x0eda, 0x0edb, 0x0ede, 0x0eff, 0x0f48, 0x0f48, 0x0f6b, 0x0f70, 0x0f8c, 0x0f8f, 0x0f98, 0x0f98, 0x0fbd, 0x0fbd, 0x0fcd, 0x0fce, 0x0fd0, 0x0fff, 0x1022, 0x1022, 0x1028, 0x1028, 0x102b, 0x102b, 0x1033, 0x1035, 0x103a, 0x103f, 0x105a, 0x109f, 0x10c6, 0x10cf, 0x10f9, 0x10fa, 0x10fc, 0x10ff, 0x115a, 0x115e, 0x11a3, 0x11a7, 0x11fa, 0x11ff, 0x1207, 0x1207, 0x1247, 0x1247, 0x1249, 0x1249, 0x124e, 0x124f, 0x1257, 0x1257, 0x1259, 0x1259, 0x125e, 0x125f, 0x1287, 0x1287, 0x1289, 0x1289, 0x128e, 0x128f, 0x12af, 0x12af, 0x12b1, 0x12b1, 0x12b6, 0x12b7, 0x12bf, 0x12bf, 0x12c1, 0x12c1, 0x12c6, 0x12c7, 0x12cf, 0x12cf, 0x12d7, 0x12d7, 0x12ef, 0x12ef, 0x130f, 0x130f, 0x1311, 0x1311, 0x1316, 0x1317, 0x131f, 0x131f, 0x1347, 0x1347, 0x135b, 0x1360, 0x137d, 0x139f, 0x13f5, 0x1400, 0x1677, 0x167f, 0x169d, 0x169f, 0x16f1, 0x16ff, 0x170d, 0x170d, 0x1715, 0x171f, 0x1737, 0x173f, 0x1754, 0x175f, 0x176d, 0x176d, 0x1771, 0x1771, 0x1774, 0x177f, 0x17dd, 0x17df, 0x17ea, 0x17ff, 0x180f, 0x180f, 0x181a, 0x181f, 0x1878, 0x187f, 0x18aa, 0x1dff, 0x1e9c, 0x1e9f, 0x1efa, 0x1eff, 0x1f16, 0x1f17, 0x1f1e, 0x1f1f, 0x1f46, 0x1f47, 0x1f4e, 0x1f4f, 0x1f58, 0x1f58, 0x1f5a, 0x1f5a, 0x1f5c, 0x1f5c, 0x1f5e, 0x1f5e, 0x1f7e, 0x1f7f, 0x1fb5, 0x1fb5, 0x1fc5, 0x1fc5, 0x1fd4, 0x1fd5, 0x1fdc, 0x1fdc, 0x1ff0, 0x1ff1, 0x1ff5, 0x1ff5, 0x1fff, 0x1fff, 0x2053, 0x2056, 0x2058, 0x205e, 0x2064, 0x2069, 0x2072, 0x2073, 0x208f, 0x209f, 0x20b2, 0x20cf, 0x20eb, 0x20ff, 0x213b, 0x213c, 0x214c, 0x2152, 0x2184, 0x218f, 0x23cf, 0x23ff, 0x2427, 0x243f, 0x244b, 0x245f, 0x24ff, 0x24ff, 0x2614, 0x2615, 0x2618, 0x2618, 0x267e, 0x267f, 0x268a, 0x2700, 0x2705, 0x2705, 0x270a, 0x270b, 0x2728, 0x2728, 0x274c, 0x274c, 0x274e, 0x274e, 0x2753, 0x2755, 0x2757, 0x2757, 0x275f, 0x2760, 0x2795, 0x2797, 0x27b0, 0x27b0, 0x27bf, 0x27cf, 0x27ec, 0x27ef, 0x2b00, 0x2e7f, 0x2e9a, 0x2e9a, 0x2ef4, 0x2eff, 0x2fd6, 0x2fef, 0x2ffc, 0x2fff, 0x3040, 0x3040, 0x3097, 0x3098, 0x3100, 0x3104, 0x312d, 0x3130, 0x318f, 0x318f, 0x31b8, 0x31ef, 0x321d, 0x321f, 0x3244, 0x3250, 0x327c, 0x327e, 0x32cc, 0x32cf, 0x32ff, 0x32ff, 0x3377, 0x337a, 0x33de, 0x33df, 0x33ff, 0x33ff, 0x4db6, 0x4dff, 0x9fa6, 0x9fff, 0xa48d, 0xa48f, 0xa4c7, 0xabff, 0xd7a4, 0xd7ff, 0xfa2e, 0xfa2f, 0xfa6b, 0xfaff, 0xfb07, 0xfb12, 0xfb18, 0xfb1c, 0xfb37, 0xfb37, 0xfb3d, 0xfb3d, 0xfb3f, 0xfb3f, 0xfb42, 0xfb42, 0xfb45, 0xfb45, 0xfbb2, 0xfbd2, 0xfd40, 0xfd4f, 0xfd90, 0xfd91, 0xfdc8, 0xfdcf, 0xfdfd, 0xfdff, 0xfe10, 0xfe1f, 0xfe24, 0xfe2f, 0xfe47, 0xfe48, 0xfe53, 0xfe53, 0xfe67, 0xfe67, 0xfe6c, 0xfe6f, 0xfe75, 0xfe75, 0xfefd, 0xfefe, 0xff00, 0xff00, 0xffbf, 0xffc1, 0xffc8, 0xffc9, 0xffd0, 0xffd1, 0xffd8, 0xffd9, 0xffdd, 0xffdf, 0xffe7, 0xffe7, 0xffef, 0xfff8, 0x10000, 0x102ff, 0x1031f, 0x1031f, 0x10324, 0x1032f, 0x1034b, 0x103ff, 0x10426, 0x10427, 0x1044e, 0x1cfff, 0x1d0f6, 0x1d0ff, 0x1d127, 0x1d129, 0x1d1de, 0x1d3ff, 0x1d455, 0x1d455, 0x1d49d, 0x1d49d, 0x1d4a0, 0x1d4a1, 0x1d4a3, 0x1d4a4, 0x1d4a7, 0x1d4a8, 0x1d4ad, 0x1d4ad, 0x1d4ba, 0x1d4ba, 0x1d4bc, 0x1d4bc, 0x1d4c1, 0x1d4c1, 0x1d4c4, 0x1d4c4, 0x1d506, 0x1d506, 0x1d50b, 0x1d50c, 0x1d515, 0x1d515, 0x1d51d, 0x1d51d, 0x1d53a, 0x1d53a, 0x1d53f, 0x1d53f, 0x1d545, 0x1d545, 0x1d547, 0x1d549, 0x1d551, 0x1d551, 0x1d6a4, 0x1d6a7, 0x1d7ca, 0x1d7cd, 0x1d800, 0x1fffd, 0x2a6d7, 0x2f7ff, 0x2fa1e, 0x2fffd, 0x30000, 0x3fffd, 0x40000, 0x4fffd, 0x50000, 0x5fffd, 0x60000, 0x6fffd, 0x70000, 0x7fffd, 0x80000, 0x8fffd, 0x90000, 0x9fffd, 0xa0000, 0xafffd, 0xb0000, 0xbfffd, 0xc0000, 0xcfffd, 0xd0000, 0xdfffd, 0xe0000, 0xe0000, 0xe0002, 0xe001f, 0xe0080, 0xefffd];
// prettier-ignore-end

const isUnassignedCodePoint = character => inRange(character, unassigned_code_points);

// prettier-ignore-start
/**
 * B.1 Commonly mapped to nothing
 * @link https://tools.ietf.org/html/rfc3454#appendix-B.1
 */
const commonly_mapped_to_nothing = [0x00ad, 0x00ad, 0x034f, 0x034f, 0x1806, 0x1806, 0x180b, 0x180b, 0x180c, 0x180c, 0x180d, 0x180d, 0x200b, 0x200b, 0x200c, 0x200c, 0x200d, 0x200d, 0x2060, 0x2060, 0xfe00, 0xfe00, 0xfe01, 0xfe01, 0xfe02, 0xfe02, 0xfe03, 0xfe03, 0xfe04, 0xfe04, 0xfe05, 0xfe05, 0xfe06, 0xfe06, 0xfe07, 0xfe07, 0xfe08, 0xfe08, 0xfe09, 0xfe09, 0xfe0a, 0xfe0a, 0xfe0b, 0xfe0b, 0xfe0c, 0xfe0c, 0xfe0d, 0xfe0d, 0xfe0e, 0xfe0e, 0xfe0f, 0xfe0f, 0xfeff, 0xfeff];
// prettier-ignore-end

const isCommonlyMappedToNothing = character => inRange(character, commonly_mapped_to_nothing);

// prettier-ignore-start
/**
 * C.1.2 Non-ASCII space characters
 * @link https://tools.ietf.org/html/rfc3454#appendix-C.1.2
 */
const non_ASCII_space_characters = [0x00a0, 0x00a0 /* NO-BREAK SPACE */, 0x1680, 0x1680 /* OGHAM SPACE MARK */, 0x2000, 0x2000 /* EN QUAD */, 0x2001, 0x2001 /* EM QUAD */, 0x2002, 0x2002 /* EN SPACE */, 0x2003, 0x2003 /* EM SPACE */, 0x2004, 0x2004 /* THREE-PER-EM SPACE */, 0x2005, 0x2005 /* FOUR-PER-EM SPACE */, 0x2006, 0x2006 /* SIX-PER-EM SPACE */, 0x2007, 0x2007 /* FIGURE SPACE */, 0x2008, 0x2008 /* PUNCTUATION SPACE */, 0x2009, 0x2009 /* THIN SPACE */, 0x200a, 0x200a /* HAIR SPACE */, 0x200b, 0x200b /* ZERO WIDTH SPACE */, 0x202f, 0x202f /* NARROW NO-BREAK SPACE */, 0x205f, 0x205f /* MEDIUM MATHEMATICAL SPACE */, 0x3000, 0x3000 /* IDEOGRAPHIC SPACE */];
// prettier-ignore-end

const isNonASCIISpaceCharacter = character => inRange(character, non_ASCII_space_characters);

// prettier-ignore-start
const non_ASCII_controls_characters = [
/**
 * C.2.2 Non-ASCII control characters
 * @link https://tools.ietf.org/html/rfc3454#appendix-C.2.2
 */
0x0080, 0x009f /* [CONTROL CHARACTERS] */, 0x06dd, 0x06dd /* ARABIC END OF AYAH */, 0x070f, 0x070f /* SYRIAC ABBREVIATION MARK */, 0x180e, 0x180e /* MONGOLIAN VOWEL SEPARATOR */, 0x200c, 0x200c /* ZERO WIDTH NON-JOINER */, 0x200d, 0x200d /* ZERO WIDTH JOINER */, 0x2028, 0x2028 /* LINE SEPARATOR */, 0x2029, 0x2029 /* PARAGRAPH SEPARATOR */, 0x2060, 0x2060 /* WORD JOINER */, 0x2061, 0x2061 /* FUNCTION APPLICATION */, 0x2062, 0x2062 /* INVISIBLE TIMES */, 0x2063, 0x2063 /* INVISIBLE SEPARATOR */, 0x206a, 0x206f /* [CONTROL CHARACTERS] */, 0xfeff, 0xfeff /* ZERO WIDTH NO-BREAK SPACE */, 0xfff9, 0xfffc /* [CONTROL CHARACTERS] */, 0x1d173, 0x1d17a /* [MUSICAL CONTROL CHARACTERS] */];
const non_character_codepoints = [
/**
 * C.4 Non-character code points
 * @link https://tools.ietf.org/html/rfc3454#appendix-C.4
 */
0xfdd0, 0xfdef /* [NONCHARACTER CODE POINTS] */, 0xfffe, 0xffff /* [NONCHARACTER CODE POINTS] */, 0x1fffe, 0x1ffff /* [NONCHARACTER CODE POINTS] */, 0x2fffe, 0x2ffff /* [NONCHARACTER CODE POINTS] */, 0x3fffe, 0x3ffff /* [NONCHARACTER CODE POINTS] */, 0x4fffe, 0x4ffff /* [NONCHARACTER CODE POINTS] */, 0x5fffe, 0x5ffff /* [NONCHARACTER CODE POINTS] */, 0x6fffe, 0x6ffff /* [NONCHARACTER CODE POINTS] */, 0x7fffe, 0x7ffff /* [NONCHARACTER CODE POINTS] */, 0x8fffe, 0x8ffff /* [NONCHARACTER CODE POINTS] */, 0x9fffe, 0x9ffff /* [NONCHARACTER CODE POINTS] */, 0xafffe, 0xaffff /* [NONCHARACTER CODE POINTS] */, 0xbfffe, 0xbffff /* [NONCHARACTER CODE POINTS] */, 0xcfffe, 0xcffff /* [NONCHARACTER CODE POINTS] */, 0xdfffe, 0xdffff /* [NONCHARACTER CODE POINTS] */, 0xefffe, 0xeffff /* [NONCHARACTER CODE POINTS] */, 0x10fffe, 0x10ffff /* [NONCHARACTER CODE POINTS] */];

/**
 * 2.3.  Prohibited Output
 */
const prohibited_characters = [
/**
 * C.2.1 ASCII control characters
 * @link https://tools.ietf.org/html/rfc3454#appendix-C.2.1
 */
0, 0x001f /* [CONTROL CHARACTERS] */, 0x007f, 0x007f /* DELETE */,
/**
 * C.8 Change display properties or are deprecated
 * @link https://tools.ietf.org/html/rfc3454#appendix-C.8
 */
0x0340, 0x0340 /* COMBINING GRAVE TONE MARK */, 0x0341, 0x0341 /* COMBINING ACUTE TONE MARK */, 0x200e, 0x200e /* LEFT-TO-RIGHT MARK */, 0x200f, 0x200f /* RIGHT-TO-LEFT MARK */, 0x202a, 0x202a /* LEFT-TO-RIGHT EMBEDDING */, 0x202b, 0x202b /* RIGHT-TO-LEFT EMBEDDING */, 0x202c, 0x202c /* POP DIRECTIONAL FORMATTING */, 0x202d, 0x202d /* LEFT-TO-RIGHT OVERRIDE */, 0x202e, 0x202e /* RIGHT-TO-LEFT OVERRIDE */, 0x206a, 0x206a /* INHIBIT SYMMETRIC SWAPPING */, 0x206b, 0x206b /* ACTIVATE SYMMETRIC SWAPPING */, 0x206c, 0x206c /* INHIBIT ARABIC FORM SHAPING */, 0x206d, 0x206d /* ACTIVATE ARABIC FORM SHAPING */, 0x206e, 0x206e /* NATIONAL DIGIT SHAPES */, 0x206f, 0x206f /* NOMINAL DIGIT SHAPES */,
/**
 * C.7 Inappropriate for canonical representation
 * @link https://tools.ietf.org/html/rfc3454#appendix-C.7
 */
0x2ff0, 0x2ffb /* [IDEOGRAPHIC DESCRIPTION CHARACTERS] */,
/**
 * C.5 Surrogate codes
 * @link https://tools.ietf.org/html/rfc3454#appendix-C.5
 */
0xd800, 0xdfff,
/**
 * C.3 Private use
 * @link https://tools.ietf.org/html/rfc3454#appendix-C.3
 */
0xe000, 0xf8ff /* [PRIVATE USE, PLANE 0] */,
/**
 * C.6 Inappropriate for plain text
 * @link https://tools.ietf.org/html/rfc3454#appendix-C.6
 */
0xfff9, 0xfff9 /* INTERLINEAR ANNOTATION ANCHOR */, 0xfffa, 0xfffa /* INTERLINEAR ANNOTATION SEPARATOR */, 0xfffb, 0xfffb /* INTERLINEAR ANNOTATION TERMINATOR */, 0xfffc, 0xfffc /* OBJECT REPLACEMENT CHARACTER */, 0xfffd, 0xfffd /* REPLACEMENT CHARACTER */,
/**
 * C.9 Tagging characters
 * @link https://tools.ietf.org/html/rfc3454#appendix-C.9
 */
0xe0001, 0xe0001 /* LANGUAGE TAG */, 0xe0020, 0xe007f /* [TAGGING CHARACTERS] */,
/**
 * C.3 Private use
 * @link https://tools.ietf.org/html/rfc3454#appendix-C.3
 */

0xf0000, 0xffffd /* [PRIVATE USE, PLANE 15] */, 0x100000, 0x10fffd /* [PRIVATE USE, PLANE 16] */];
// prettier-ignore-end

const isProhibitedCharacter = character => inRange(character, non_ASCII_space_characters) || inRange(character, prohibited_characters) || inRange(character, non_ASCII_controls_characters) || inRange(character, non_character_codepoints);

// prettier-ignore-start
/**
 * D.1 Characters with bidirectional property "R" or "AL"
 * @link https://tools.ietf.org/html/rfc3454#appendix-D.1
 */
const bidirectional_r_al = [0x05be, 0x05be, 0x05c0, 0x05c0, 0x05c3, 0x05c3, 0x05d0, 0x05ea, 0x05f0, 0x05f4, 0x061b, 0x061b, 0x061f, 0x061f, 0x0621, 0x063a, 0x0640, 0x064a, 0x066d, 0x066f, 0x0671, 0x06d5, 0x06dd, 0x06dd, 0x06e5, 0x06e6, 0x06fa, 0x06fe, 0x0700, 0x070d, 0x0710, 0x0710, 0x0712, 0x072c, 0x0780, 0x07a5, 0x07b1, 0x07b1, 0x200f, 0x200f, 0xfb1d, 0xfb1d, 0xfb1f, 0xfb28, 0xfb2a, 0xfb36, 0xfb38, 0xfb3c, 0xfb3e, 0xfb3e, 0xfb40, 0xfb41, 0xfb43, 0xfb44, 0xfb46, 0xfbb1, 0xfbd3, 0xfd3d, 0xfd50, 0xfd8f, 0xfd92, 0xfdc7, 0xfdf0, 0xfdfc, 0xfe70, 0xfe74, 0xfe76, 0xfefc];
// prettier-ignore-end

const isBidirectionalRAL = character => inRange(character, bidirectional_r_al);

// prettier-ignore-start
/**
 * D.2 Characters with bidirectional property "L"
 * @link https://tools.ietf.org/html/rfc3454#appendix-D.2
 */
const bidirectional_l = [0x0041, 0x005a, 0x0061, 0x007a, 0x00aa, 0x00aa, 0x00b5, 0x00b5, 0x00ba, 0x00ba, 0x00c0, 0x00d6, 0x00d8, 0x00f6, 0x00f8, 0x0220, 0x0222, 0x0233, 0x0250, 0x02ad, 0x02b0, 0x02b8, 0x02bb, 0x02c1, 0x02d0, 0x02d1, 0x02e0, 0x02e4, 0x02ee, 0x02ee, 0x037a, 0x037a, 0x0386, 0x0386, 0x0388, 0x038a, 0x038c, 0x038c, 0x038e, 0x03a1, 0x03a3, 0x03ce, 0x03d0, 0x03f5, 0x0400, 0x0482, 0x048a, 0x04ce, 0x04d0, 0x04f5, 0x04f8, 0x04f9, 0x0500, 0x050f, 0x0531, 0x0556, 0x0559, 0x055f, 0x0561, 0x0587, 0x0589, 0x0589, 0x0903, 0x0903, 0x0905, 0x0939, 0x093d, 0x0940, 0x0949, 0x094c, 0x0950, 0x0950, 0x0958, 0x0961, 0x0964, 0x0970, 0x0982, 0x0983, 0x0985, 0x098c, 0x098f, 0x0990, 0x0993, 0x09a8, 0x09aa, 0x09b0, 0x09b2, 0x09b2, 0x09b6, 0x09b9, 0x09be, 0x09c0, 0x09c7, 0x09c8, 0x09cb, 0x09cc, 0x09d7, 0x09d7, 0x09dc, 0x09dd, 0x09df, 0x09e1, 0x09e6, 0x09f1, 0x09f4, 0x09fa, 0x0a05, 0x0a0a, 0x0a0f, 0x0a10, 0x0a13, 0x0a28, 0x0a2a, 0x0a30, 0x0a32, 0x0a33, 0x0a35, 0x0a36, 0x0a38, 0x0a39, 0x0a3e, 0x0a40, 0x0a59, 0x0a5c, 0x0a5e, 0x0a5e, 0x0a66, 0x0a6f, 0x0a72, 0x0a74, 0x0a83, 0x0a83, 0x0a85, 0x0a8b, 0x0a8d, 0x0a8d, 0x0a8f, 0x0a91, 0x0a93, 0x0aa8, 0x0aaa, 0x0ab0, 0x0ab2, 0x0ab3, 0x0ab5, 0x0ab9, 0x0abd, 0x0ac0, 0x0ac9, 0x0ac9, 0x0acb, 0x0acc, 0x0ad0, 0x0ad0, 0x0ae0, 0x0ae0, 0x0ae6, 0x0aef, 0x0b02, 0x0b03, 0x0b05, 0x0b0c, 0x0b0f, 0x0b10, 0x0b13, 0x0b28, 0x0b2a, 0x0b30, 0x0b32, 0x0b33, 0x0b36, 0x0b39, 0x0b3d, 0x0b3e, 0x0b40, 0x0b40, 0x0b47, 0x0b48, 0x0b4b, 0x0b4c, 0x0b57, 0x0b57, 0x0b5c, 0x0b5d, 0x0b5f, 0x0b61, 0x0b66, 0x0b70, 0x0b83, 0x0b83, 0x0b85, 0x0b8a, 0x0b8e, 0x0b90, 0x0b92, 0x0b95, 0x0b99, 0x0b9a, 0x0b9c, 0x0b9c, 0x0b9e, 0x0b9f, 0x0ba3, 0x0ba4, 0x0ba8, 0x0baa, 0x0bae, 0x0bb5, 0x0bb7, 0x0bb9, 0x0bbe, 0x0bbf, 0x0bc1, 0x0bc2, 0x0bc6, 0x0bc8, 0x0bca, 0x0bcc, 0x0bd7, 0x0bd7, 0x0be7, 0x0bf2, 0x0c01, 0x0c03, 0x0c05, 0x0c0c, 0x0c0e, 0x0c10, 0x0c12, 0x0c28, 0x0c2a, 0x0c33, 0x0c35, 0x0c39, 0x0c41, 0x0c44, 0x0c60, 0x0c61, 0x0c66, 0x0c6f, 0x0c82, 0x0c83, 0x0c85, 0x0c8c, 0x0c8e, 0x0c90, 0x0c92, 0x0ca8, 0x0caa, 0x0cb3, 0x0cb5, 0x0cb9, 0x0cbe, 0x0cbe, 0x0cc0, 0x0cc4, 0x0cc7, 0x0cc8, 0x0cca, 0x0ccb, 0x0cd5, 0x0cd6, 0x0cde, 0x0cde, 0x0ce0, 0x0ce1, 0x0ce6, 0x0cef, 0x0d02, 0x0d03, 0x0d05, 0x0d0c, 0x0d0e, 0x0d10, 0x0d12, 0x0d28, 0x0d2a, 0x0d39, 0x0d3e, 0x0d40, 0x0d46, 0x0d48, 0x0d4a, 0x0d4c, 0x0d57, 0x0d57, 0x0d60, 0x0d61, 0x0d66, 0x0d6f, 0x0d82, 0x0d83, 0x0d85, 0x0d96, 0x0d9a, 0x0db1, 0x0db3, 0x0dbb, 0x0dbd, 0x0dbd, 0x0dc0, 0x0dc6, 0x0dcf, 0x0dd1, 0x0dd8, 0x0ddf, 0x0df2, 0x0df4, 0x0e01, 0x0e30, 0x0e32, 0x0e33, 0x0e40, 0x0e46, 0x0e4f, 0x0e5b, 0x0e81, 0x0e82, 0x0e84, 0x0e84, 0x0e87, 0x0e88, 0x0e8a, 0x0e8a, 0x0e8d, 0x0e8d, 0x0e94, 0x0e97, 0x0e99, 0x0e9f, 0x0ea1, 0x0ea3, 0x0ea5, 0x0ea5, 0x0ea7, 0x0ea7, 0x0eaa, 0x0eab, 0x0ead, 0x0eb0, 0x0eb2, 0x0eb3, 0x0ebd, 0x0ebd, 0x0ec0, 0x0ec4, 0x0ec6, 0x0ec6, 0x0ed0, 0x0ed9, 0x0edc, 0x0edd, 0x0f00, 0x0f17, 0x0f1a, 0x0f34, 0x0f36, 0x0f36, 0x0f38, 0x0f38, 0x0f3e, 0x0f47, 0x0f49, 0x0f6a, 0x0f7f, 0x0f7f, 0x0f85, 0x0f85, 0x0f88, 0x0f8b, 0x0fbe, 0x0fc5, 0x0fc7, 0x0fcc, 0x0fcf, 0x0fcf, 0x1000, 0x1021, 0x1023, 0x1027, 0x1029, 0x102a, 0x102c, 0x102c, 0x1031, 0x1031, 0x1038, 0x1038, 0x1040, 0x1057, 0x10a0, 0x10c5, 0x10d0, 0x10f8, 0x10fb, 0x10fb, 0x1100, 0x1159, 0x115f, 0x11a2, 0x11a8, 0x11f9, 0x1200, 0x1206, 0x1208, 0x1246, 0x1248, 0x1248, 0x124a, 0x124d, 0x1250, 0x1256, 0x1258, 0x1258, 0x125a, 0x125d, 0x1260, 0x1286, 0x1288, 0x1288, 0x128a, 0x128d, 0x1290, 0x12ae, 0x12b0, 0x12b0, 0x12b2, 0x12b5, 0x12b8, 0x12be, 0x12c0, 0x12c0, 0x12c2, 0x12c5, 0x12c8, 0x12ce, 0x12d0, 0x12d6, 0x12d8, 0x12ee, 0x12f0, 0x130e, 0x1310, 0x1310, 0x1312, 0x1315, 0x1318, 0x131e, 0x1320, 0x1346, 0x1348, 0x135a, 0x1361, 0x137c, 0x13a0, 0x13f4, 0x1401, 0x1676, 0x1681, 0x169a, 0x16a0, 0x16f0, 0x1700, 0x170c, 0x170e, 0x1711, 0x1720, 0x1731, 0x1735, 0x1736, 0x1740, 0x1751, 0x1760, 0x176c, 0x176e, 0x1770, 0x1780, 0x17b6, 0x17be, 0x17c5, 0x17c7, 0x17c8, 0x17d4, 0x17da, 0x17dc, 0x17dc, 0x17e0, 0x17e9, 0x1810, 0x1819, 0x1820, 0x1877, 0x1880, 0x18a8, 0x1e00, 0x1e9b, 0x1ea0, 0x1ef9, 0x1f00, 0x1f15, 0x1f18, 0x1f1d, 0x1f20, 0x1f45, 0x1f48, 0x1f4d, 0x1f50, 0x1f57, 0x1f59, 0x1f59, 0x1f5b, 0x1f5b, 0x1f5d, 0x1f5d, 0x1f5f, 0x1f7d, 0x1f80, 0x1fb4, 0x1fb6, 0x1fbc, 0x1fbe, 0x1fbe, 0x1fc2, 0x1fc4, 0x1fc6, 0x1fcc, 0x1fd0, 0x1fd3, 0x1fd6, 0x1fdb, 0x1fe0, 0x1fec, 0x1ff2, 0x1ff4, 0x1ff6, 0x1ffc, 0x200e, 0x200e, 0x2071, 0x2071, 0x207f, 0x207f, 0x2102, 0x2102, 0x2107, 0x2107, 0x210a, 0x2113, 0x2115, 0x2115, 0x2119, 0x211d, 0x2124, 0x2124, 0x2126, 0x2126, 0x2128, 0x2128, 0x212a, 0x212d, 0x212f, 0x2131, 0x2133, 0x2139, 0x213d, 0x213f, 0x2145, 0x2149, 0x2160, 0x2183, 0x2336, 0x237a, 0x2395, 0x2395, 0x249c, 0x24e9, 0x3005, 0x3007, 0x3021, 0x3029, 0x3031, 0x3035, 0x3038, 0x303c, 0x3041, 0x3096, 0x309d, 0x309f, 0x30a1, 0x30fa, 0x30fc, 0x30ff, 0x3105, 0x312c, 0x3131, 0x318e, 0x3190, 0x31b7, 0x31f0, 0x321c, 0x3220, 0x3243, 0x3260, 0x327b, 0x327f, 0x32b0, 0x32c0, 0x32cb, 0x32d0, 0x32fe, 0x3300, 0x3376, 0x337b, 0x33dd, 0x33e0, 0x33fe, 0x3400, 0x4db5, 0x4e00, 0x9fa5, 0xa000, 0xa48c, 0xac00, 0xd7a3, 0xd800, 0xfa2d, 0xfa30, 0xfa6a, 0xfb00, 0xfb06, 0xfb13, 0xfb17, 0xff21, 0xff3a, 0xff41, 0xff5a, 0xff66, 0xffbe, 0xffc2, 0xffc7, 0xffca, 0xffcf, 0xffd2, 0xffd7, 0xffda, 0xffdc, 0x10300, 0x1031e, 0x10320, 0x10323, 0x10330, 0x1034a, 0x10400, 0x10425, 0x10428, 0x1044d, 0x1d000, 0x1d0f5, 0x1d100, 0x1d126, 0x1d12a, 0x1d166, 0x1d16a, 0x1d172, 0x1d183, 0x1d184, 0x1d18c, 0x1d1a9, 0x1d1ae, 0x1d1dd, 0x1d400, 0x1d454, 0x1d456, 0x1d49c, 0x1d49e, 0x1d49f, 0x1d4a2, 0x1d4a2, 0x1d4a5, 0x1d4a6, 0x1d4a9, 0x1d4ac, 0x1d4ae, 0x1d4b9, 0x1d4bb, 0x1d4bb, 0x1d4bd, 0x1d4c0, 0x1d4c2, 0x1d4c3, 0x1d4c5, 0x1d505, 0x1d507, 0x1d50a, 0x1d50d, 0x1d514, 0x1d516, 0x1d51c, 0x1d51e, 0x1d539, 0x1d53b, 0x1d53e, 0x1d540, 0x1d544, 0x1d546, 0x1d546, 0x1d54a, 0x1d550, 0x1d552, 0x1d6a3, 0x1d6a8, 0x1d7c9, 0x20000, 0x2a6d6, 0x2f800, 0x2fa1d, 0xf0000, 0xffffd, 0x100000, 0x10fffd];
// prettier-ignore-end

const isBidirectionalL = character => inRange(character, bidirectional_l);

// 2.1.  Mapping

/**
 * non-ASCII space characters [StringPrep, C.1.2] that can be
 * mapped to SPACE (U+0020)
 */
const mapping2space = isNonASCIISpaceCharacter;

/**
 * the "commonly mapped to nothing" characters [StringPrep, B.1]
 * that can be mapped to nothing.
 */
const mapping2nothing = isCommonlyMappedToNothing;

// utils
const getCodePoint = character => character.codePointAt(0);
const first = x => x[0];
const last = x => x[x.length - 1];

/**
 * Convert provided string into an array of Unicode Code Points.
 * Based on https://stackoverflow.com/a/21409165/1556249
 * and https://www.npmjs.com/package/code-point-at.
 * @param {string} input
 * @returns {number[]}
 */
function toCodePoints(input) {
  const codepoints = [];
  const size = input.length;
  for (let i = 0; i < size; i += 1) {
    const before = input.charCodeAt(i);
    if (before >= 0xd800 && before <= 0xdbff && size > i + 1) {
      const next = input.charCodeAt(i + 1);
      if (next >= 0xdc00 && next <= 0xdfff) {
        codepoints.push((before - 0xd800) * 0x400 + next - 0xdc00 + 0x10000);
        i += 1;
        continue;
      }
    }
    codepoints.push(before);
  }
  return codepoints;
}

/**
 * SASLprep.
 * @param {string} input
 * @param {Object} opts
 * @param {boolean} opts.allowUnassigned
 * @returns {string}
 */
function saslprep(input, opts = {}) {
  if (typeof input !== 'string') {
    throw new TypeError('Expected string.');
  }
  if (input.length === 0) {
    return '';
  }

  // 1. Map
  const mapped_input = toCodePoints(input)
  // 1.1 mapping to space
  .map(character => mapping2space(character) ? 0x20 : character)
  // 1.2 mapping to nothing
  .filter(character => !mapping2nothing(character));

  // 2. Normalize
  const normalized_input = String.fromCodePoint.apply(null, mapped_input).normalize('NFKC');
  const normalized_map = toCodePoints(normalized_input);

  // 3. Prohibit
  const hasProhibited = normalized_map.some(isProhibitedCharacter);
  if (hasProhibited) {
    throw new Error('Prohibited character, see https://tools.ietf.org/html/rfc4013#section-2.3');
  }

  // Unassigned Code Points
  if (opts.allowUnassigned !== true) {
    const hasUnassigned = normalized_map.some(isUnassignedCodePoint);
    if (hasUnassigned) {
      throw new Error('Unassigned code point, see https://tools.ietf.org/html/rfc4013#section-2.5');
    }
  }

  // 4. check bidi

  const hasBidiRAL = normalized_map.some(isBidirectionalRAL);
  const hasBidiL = normalized_map.some(isBidirectionalL);

  // 4.1 If a string contains any RandALCat character, the string MUST NOT
  // contain any LCat character.
  if (hasBidiRAL && hasBidiL) {
    throw new Error('String must not contain RandALCat and LCat at the same time,' + ' see https://tools.ietf.org/html/rfc3454#section-6');
  }

  /**
   * 4.2 If a string contains any RandALCat character, a RandALCat
   * character MUST be the first character of the string, and a
   * RandALCat character MUST be the last character of the string.
   */

  const isFirstBidiRAL = isBidirectionalRAL(getCodePoint(first(normalized_input)));
  const isLastBidiRAL = isBidirectionalRAL(getCodePoint(last(normalized_input)));
  if (hasBidiRAL && !(isFirstBidiRAL && isLastBidiRAL)) {
    throw new Error('Bidirectional RandALCat character must be the first and the last' + ' character of the string, see https://tools.ietf.org/html/rfc3454#section-6');
  }
  return normalized_input;
}

/*
   PDFSecurity - represents PDF security settings
   By Yang Liu <hi@zesik.com>
 */
class PDFSecurity {
  static generateFileID(info = {}) {
    let infoStr = `${info.CreationDate.getTime()}\n`;
    for (let key in info) {
      // eslint-disable-next-line no-prototype-builtins
      if (!info.hasOwnProperty(key)) {
        continue;
      }
      infoStr += `${key}: ${info[key].valueOf()}\n`;
    }
    return wordArrayToBuffer(CryptoJS.MD5(infoStr));
  }
  static generateRandomWordArray(bytes) {
    return CryptoJS.lib.WordArray.random(bytes);
  }
  static create(document, options = {}) {
    if (!options.ownerPassword && !options.userPassword) {
      return null;
    }
    return new PDFSecurity(document, options);
  }
  constructor(document, options = {}) {
    if (!options.ownerPassword && !options.userPassword) {
      throw new Error('None of owner password and user password is defined.');
    }
    this.document = document;
    this._setupEncryption(options);
  }
  _setupEncryption(options) {
    switch (options.pdfVersion) {
      case '1.4':
      case '1.5':
        this.version = 2;
        break;
      case '1.6':
      case '1.7':
        this.version = 4;
        break;
      case '1.7ext3':
        this.version = 5;
        break;
      default:
        this.version = 1;
        break;
    }
    const encDict = {
      Filter: 'Standard'
    };
    switch (this.version) {
      case 1:
      case 2:
      case 4:
        this._setupEncryptionV1V2V4(this.version, encDict, options);
        break;
      case 5:
        this._setupEncryptionV5(encDict, options);
        break;
    }
    this.dictionary = this.document.ref(encDict);
  }
  _setupEncryptionV1V2V4(v, encDict, options) {
    let r, permissions;
    switch (v) {
      case 1:
        r = 2;
        this.keyBits = 40;
        permissions = getPermissionsR2(options.permissions);
        break;
      case 2:
        r = 3;
        this.keyBits = 128;
        permissions = getPermissionsR3(options.permissions);
        break;
      case 4:
        r = 4;
        this.keyBits = 128;
        permissions = getPermissionsR3(options.permissions);
        break;
    }
    const paddedUserPassword = processPasswordR2R3R4(options.userPassword);
    const paddedOwnerPassword = options.ownerPassword ? processPasswordR2R3R4(options.ownerPassword) : paddedUserPassword;
    const ownerPasswordEntry = getOwnerPasswordR2R3R4(r, this.keyBits, paddedUserPassword, paddedOwnerPassword);
    this.encryptionKey = getEncryptionKeyR2R3R4(r, this.keyBits, this.document._id, paddedUserPassword, ownerPasswordEntry, permissions);
    let userPasswordEntry;
    if (r === 2) {
      userPasswordEntry = getUserPasswordR2(this.encryptionKey);
    } else {
      userPasswordEntry = getUserPasswordR3R4(this.document._id, this.encryptionKey);
    }
    encDict.V = v;
    if (v >= 2) {
      encDict.Length = this.keyBits;
    }
    if (v === 4) {
      encDict.CF = {
        StdCF: {
          AuthEvent: 'DocOpen',
          CFM: 'AESV2',
          Length: this.keyBits / 8
        }
      };
      encDict.StmF = 'StdCF';
      encDict.StrF = 'StdCF';
    }
    encDict.R = r;
    encDict.O = wordArrayToBuffer(ownerPasswordEntry);
    encDict.U = wordArrayToBuffer(userPasswordEntry);
    encDict.P = permissions;
  }
  _setupEncryptionV5(encDict, options) {
    this.keyBits = 256;
    const permissions = getPermissionsR3(options.permissions);
    const processedUserPassword = processPasswordR5(options.userPassword);
    const processedOwnerPassword = options.ownerPassword ? processPasswordR5(options.ownerPassword) : processedUserPassword;
    this.encryptionKey = getEncryptionKeyR5(PDFSecurity.generateRandomWordArray);
    const userPasswordEntry = getUserPasswordR5(processedUserPassword, PDFSecurity.generateRandomWordArray);
    const userKeySalt = CryptoJS.lib.WordArray.create(userPasswordEntry.words.slice(10, 12), 8);
    const userEncryptionKeyEntry = getUserEncryptionKeyR5(processedUserPassword, userKeySalt, this.encryptionKey);
    const ownerPasswordEntry = getOwnerPasswordR5(processedOwnerPassword, userPasswordEntry, PDFSecurity.generateRandomWordArray);
    const ownerKeySalt = CryptoJS.lib.WordArray.create(ownerPasswordEntry.words.slice(10, 12), 8);
    const ownerEncryptionKeyEntry = getOwnerEncryptionKeyR5(processedOwnerPassword, ownerKeySalt, userPasswordEntry, this.encryptionKey);
    const permsEntry = getEncryptedPermissionsR5(permissions, this.encryptionKey, PDFSecurity.generateRandomWordArray);
    encDict.V = 5;
    encDict.Length = this.keyBits;
    encDict.CF = {
      StdCF: {
        AuthEvent: 'DocOpen',
        CFM: 'AESV3',
        Length: this.keyBits / 8
      }
    };
    encDict.StmF = 'StdCF';
    encDict.StrF = 'StdCF';
    encDict.R = 5;
    encDict.O = wordArrayToBuffer(ownerPasswordEntry);
    encDict.OE = wordArrayToBuffer(ownerEncryptionKeyEntry);
    encDict.U = wordArrayToBuffer(userPasswordEntry);
    encDict.UE = wordArrayToBuffer(userEncryptionKeyEntry);
    encDict.P = permissions;
    encDict.Perms = wordArrayToBuffer(permsEntry);
  }
  getEncryptFn(obj, gen) {
    let digest;
    if (this.version < 5) {
      digest = this.encryptionKey.clone().concat(CryptoJS.lib.WordArray.create([(obj & 0xff) << 24 | (obj & 0xff00) << 8 | obj >> 8 & 0xff00 | gen & 0xff, (gen & 0xff00) << 16], 5));
    }
    if (this.version === 1 || this.version === 2) {
      let key = CryptoJS.MD5(digest);
      key.sigBytes = Math.min(16, this.keyBits / 8 + 5);
      return buffer => wordArrayToBuffer(CryptoJS.RC4.encrypt(CryptoJS.lib.WordArray.create(buffer), key).ciphertext);
    }
    let key;
    if (this.version === 4) {
      key = CryptoJS.MD5(digest.concat(CryptoJS.lib.WordArray.create([0x73416c54], 4)));
    } else {
      key = this.encryptionKey;
    }
    const iv = PDFSecurity.generateRandomWordArray(16);
    const options = {
      mode: CryptoJS.mode.CBC,
      padding: CryptoJS.pad.Pkcs7,
      iv
    };
    return buffer => wordArrayToBuffer(iv.clone().concat(CryptoJS.AES.encrypt(CryptoJS.lib.WordArray.create(buffer), key, options).ciphertext));
  }
  end() {
    this.dictionary.end();
  }
}
function getPermissionsR2(permissionObject = {}) {
  let permissions = 0xffffffc0 >> 0;
  if (permissionObject.printing) {
    permissions |= 0b000000000100;
  }
  if (permissionObject.modifying) {
    permissions |= 0b000000001000;
  }
  if (permissionObject.copying) {
    permissions |= 0b000000010000;
  }
  if (permissionObject.annotating) {
    permissions |= 0b000000100000;
  }
  return permissions;
}
function getPermissionsR3(permissionObject = {}) {
  let permissions = 0xfffff0c0 >> 0;
  if (permissionObject.printing === 'lowResolution') {
    permissions |= 0b000000000100;
  }
  if (permissionObject.printing === 'highResolution') {
    permissions |= 0b100000000100;
  }
  if (permissionObject.modifying) {
    permissions |= 0b000000001000;
  }
  if (permissionObject.copying) {
    permissions |= 0b000000010000;
  }
  if (permissionObject.annotating) {
    permissions |= 0b000000100000;
  }
  if (permissionObject.fillingForms) {
    permissions |= 0b000100000000;
  }
  if (permissionObject.contentAccessibility) {
    permissions |= 0b001000000000;
  }
  if (permissionObject.documentAssembly) {
    permissions |= 0b010000000000;
  }
  return permissions;
}
function getUserPasswordR2(encryptionKey) {
  return CryptoJS.RC4.encrypt(processPasswordR2R3R4(), encryptionKey).ciphertext;
}
function getUserPasswordR3R4(documentId, encryptionKey) {
  const key = encryptionKey.clone();
  let cipher = CryptoJS.MD5(processPasswordR2R3R4().concat(CryptoJS.lib.WordArray.create(documentId)));
  for (let i = 0; i < 20; i++) {
    const xorRound = Math.ceil(key.sigBytes / 4);
    for (let j = 0; j < xorRound; j++) {
      key.words[j] = encryptionKey.words[j] ^ (i | i << 8 | i << 16 | i << 24);
    }
    cipher = CryptoJS.RC4.encrypt(cipher, key).ciphertext;
  }
  return cipher.concat(CryptoJS.lib.WordArray.create(null, 16));
}
function getOwnerPasswordR2R3R4(r, keyBits, paddedUserPassword, paddedOwnerPassword) {
  let digest = paddedOwnerPassword;
  let round = r >= 3 ? 51 : 1;
  for (let i = 0; i < round; i++) {
    digest = CryptoJS.MD5(digest);
  }
  const key = digest.clone();
  key.sigBytes = keyBits / 8;
  let cipher = paddedUserPassword;
  round = r >= 3 ? 20 : 1;
  for (let i = 0; i < round; i++) {
    const xorRound = Math.ceil(key.sigBytes / 4);
    for (let j = 0; j < xorRound; j++) {
      key.words[j] = digest.words[j] ^ (i | i << 8 | i << 16 | i << 24);
    }
    cipher = CryptoJS.RC4.encrypt(cipher, key).ciphertext;
  }
  return cipher;
}
function getEncryptionKeyR2R3R4(r, keyBits, documentId, paddedUserPassword, ownerPasswordEntry, permissions) {
  let key = paddedUserPassword.clone().concat(ownerPasswordEntry).concat(CryptoJS.lib.WordArray.create([lsbFirstWord(permissions)], 4)).concat(CryptoJS.lib.WordArray.create(documentId));
  const round = r >= 3 ? 51 : 1;
  for (let i = 0; i < round; i++) {
    key = CryptoJS.MD5(key);
    key.sigBytes = keyBits / 8;
  }
  return key;
}
function getUserPasswordR5(processedUserPassword, generateRandomWordArray) {
  const validationSalt = generateRandomWordArray(8);
  const keySalt = generateRandomWordArray(8);
  return CryptoJS.SHA256(processedUserPassword.clone().concat(validationSalt)).concat(validationSalt).concat(keySalt);
}
function getUserEncryptionKeyR5(processedUserPassword, userKeySalt, encryptionKey) {
  const key = CryptoJS.SHA256(processedUserPassword.clone().concat(userKeySalt));
  const options = {
    mode: CryptoJS.mode.CBC,
    padding: CryptoJS.pad.NoPadding,
    iv: CryptoJS.lib.WordArray.create(null, 16)
  };
  return CryptoJS.AES.encrypt(encryptionKey, key, options).ciphertext;
}
function getOwnerPasswordR5(processedOwnerPassword, userPasswordEntry, generateRandomWordArray) {
  const validationSalt = generateRandomWordArray(8);
  const keySalt = generateRandomWordArray(8);
  return CryptoJS.SHA256(processedOwnerPassword.clone().concat(validationSalt).concat(userPasswordEntry)).concat(validationSalt).concat(keySalt);
}
function getOwnerEncryptionKeyR5(processedOwnerPassword, ownerKeySalt, userPasswordEntry, encryptionKey) {
  const key = CryptoJS.SHA256(processedOwnerPassword.clone().concat(ownerKeySalt).concat(userPasswordEntry));
  const options = {
    mode: CryptoJS.mode.CBC,
    padding: CryptoJS.pad.NoPadding,
    iv: CryptoJS.lib.WordArray.create(null, 16)
  };
  return CryptoJS.AES.encrypt(encryptionKey, key, options).ciphertext;
}
function getEncryptionKeyR5(generateRandomWordArray) {
  return generateRandomWordArray(32);
}
function getEncryptedPermissionsR5(permissions, encryptionKey, generateRandomWordArray) {
  const cipher = CryptoJS.lib.WordArray.create([lsbFirstWord(permissions), 0xffffffff, 0x54616462], 12).concat(generateRandomWordArray(4));
  const options = {
    mode: CryptoJS.mode.ECB,
    padding: CryptoJS.pad.NoPadding
  };
  return CryptoJS.AES.encrypt(cipher, encryptionKey, options).ciphertext;
}
function processPasswordR2R3R4(password = '') {
  const out = Buffer.alloc(32);
  const length = password.length;
  let index = 0;
  while (index < length && index < 32) {
    const code = password.charCodeAt(index);
    if (code > 0xff) {
      throw new Error('Password contains one or more invalid characters.');
    }
    out[index] = code;
    index++;
  }
  while (index < 32) {
    out[index] = PASSWORD_PADDING[index - length];
    index++;
  }
  return CryptoJS.lib.WordArray.create(out);
}
function processPasswordR5(password = '') {
  password = unescape(encodeURIComponent(saslprep(password)));
  const length = Math.min(127, password.length);
  const out = Buffer.alloc(length);
  for (let i = 0; i < length; i++) {
    out[i] = password.charCodeAt(i);
  }
  return CryptoJS.lib.WordArray.create(out);
}
function lsbFirstWord(data) {
  return (data & 0xff) << 24 | (data & 0xff00) << 8 | data >> 8 & 0xff00 | data >> 24 & 0xff;
}
function wordArrayToBuffer(wordArray) {
  const byteArray = [];
  for (let i = 0; i < wordArray.sigBytes; i++) {
    byteArray.push(wordArray.words[Math.floor(i / 4)] >> 8 * (3 - i % 4) & 0xff);
  }
  return Buffer.from(byteArray);
}
const PASSWORD_PADDING = [0x28, 0xbf, 0x4e, 0x5e, 0x4e, 0x75, 0x8a, 0x41, 0x64, 0x00, 0x4e, 0x56, 0xff, 0xfa, 0x01, 0x08, 0x2e, 0x2e, 0x00, 0xb6, 0xd0, 0x68, 0x3e, 0x80, 0x2f, 0x0c, 0xa9, 0xfe, 0x64, 0x53, 0x69, 0x7a];

const {
  number
} = PDFObject;
class PDFGradient {
  constructor(doc) {
    this.doc = doc;
    this.stops = [];
    this.embedded = false;
    this.transform = [1, 0, 0, 1, 0, 0];
  }
  stop(pos, color, opacity) {
    if (opacity == null) {
      opacity = 1;
    }
    color = this.doc._normalizeColor(color);
    if (this.stops.length === 0) {
      if (color.length === 3) {
        this._colorSpace = 'DeviceRGB';
      } else if (color.length === 4) {
        this._colorSpace = 'DeviceCMYK';
      } else if (color.length === 1) {
        this._colorSpace = 'DeviceGray';
      } else {
        throw new Error('Unknown color space');
      }
    } else if (this._colorSpace === 'DeviceRGB' && color.length !== 3 || this._colorSpace === 'DeviceCMYK' && color.length !== 4 || this._colorSpace === 'DeviceGray' && color.length !== 1) {
      throw new Error('All gradient stops must use the same color space');
    }
    opacity = Math.max(0, Math.min(1, opacity));
    this.stops.push([pos, color, opacity]);
    return this;
  }
  setTransform(m11, m12, m21, m22, dx, dy) {
    this.transform = [m11, m12, m21, m22, dx, dy];
    return this;
  }
  embed(m) {
    let fn;
    const stopsLength = this.stops.length;
    if (stopsLength === 0) {
      return;
    }
    this.embedded = true;
    this.matrix = m;

    // if the last stop comes before 100%, add a copy at 100%
    const last = this.stops[stopsLength - 1];
    if (last[0] < 1) {
      this.stops.push([1, last[1], last[2]]);
    }
    const bounds = [];
    const encode = [];
    const stops = [];
    for (let i = 0; i < stopsLength - 1; i++) {
      encode.push(0, 1);
      if (i + 2 !== stopsLength) {
        bounds.push(this.stops[i + 1][0]);
      }
      fn = this.doc.ref({
        FunctionType: 2,
        Domain: [0, 1],
        C0: this.stops[i + 0][1],
        C1: this.stops[i + 1][1],
        N: 1
      });
      stops.push(fn);
      fn.end();
    }

    // if there are only two stops, we don't need a stitching function
    if (stopsLength === 1) {
      fn = stops[0];
    } else {
      fn = this.doc.ref({
        FunctionType: 3,
        // stitching function
        Domain: [0, 1],
        Functions: stops,
        Bounds: bounds,
        Encode: encode
      });
      fn.end();
    }
    this.id = `Sh${++this.doc._gradCount}`;
    const shader = this.shader(fn);
    shader.end();
    const pattern = this.doc.ref({
      Type: 'Pattern',
      PatternType: 2,
      Shading: shader,
      Matrix: this.matrix.map(number)
    });
    pattern.end();
    if (this.stops.some(stop => stop[2] < 1)) {
      let grad = this.opacityGradient();
      grad._colorSpace = 'DeviceGray';
      for (let stop of this.stops) {
        grad.stop(stop[0], [stop[2]]);
      }
      grad = grad.embed(this.matrix);
      const pageBBox = [0, 0, this.doc.page.width, this.doc.page.height];
      const form = this.doc.ref({
        Type: 'XObject',
        Subtype: 'Form',
        FormType: 1,
        BBox: pageBBox,
        Group: {
          Type: 'Group',
          S: 'Transparency',
          CS: 'DeviceGray'
        },
        Resources: {
          ProcSet: ['PDF', 'Text', 'ImageB', 'ImageC', 'ImageI'],
          Pattern: {
            Sh1: grad
          }
        }
      });
      form.write('/Pattern cs /Sh1 scn');
      form.end(`${pageBBox.join(' ')} re f`);
      const gstate = this.doc.ref({
        Type: 'ExtGState',
        SMask: {
          Type: 'Mask',
          S: 'Luminosity',
          G: form
        }
      });
      gstate.end();
      const opacityPattern = this.doc.ref({
        Type: 'Pattern',
        PatternType: 1,
        PaintType: 1,
        TilingType: 2,
        BBox: pageBBox,
        XStep: pageBBox[2],
        YStep: pageBBox[3],
        Resources: {
          ProcSet: ['PDF', 'Text', 'ImageB', 'ImageC', 'ImageI'],
          Pattern: {
            Sh1: pattern
          },
          ExtGState: {
            Gs1: gstate
          }
        }
      });
      opacityPattern.write('/Gs1 gs /Pattern cs /Sh1 scn');
      opacityPattern.end(`${pageBBox.join(' ')} re f`);
      this.doc.page.patterns[this.id] = opacityPattern;
    } else {
      this.doc.page.patterns[this.id] = pattern;
    }
    return pattern;
  }
  apply(stroke) {
    // apply gradient transform to existing document ctm
    const [m0, m1, m2, m3, m4, m5] = this.doc._ctm;
    const [m11, m12, m21, m22, dx, dy] = this.transform;
    const m = [m0 * m11 + m2 * m12, m1 * m11 + m3 * m12, m0 * m21 + m2 * m22, m1 * m21 + m3 * m22, m0 * dx + m2 * dy + m4, m1 * dx + m3 * dy + m5];
    if (!this.embedded || m.join(' ') !== this.matrix.join(' ')) {
      this.embed(m);
    }
    this.doc._setColorSpace('Pattern', stroke);
    const op = stroke ? 'SCN' : 'scn';
    return this.doc.addContent(`/${this.id} ${op}`);
  }
}
class PDFLinearGradient extends PDFGradient {
  constructor(doc, x1, y1, x2, y2) {
    super(doc);
    this.x1 = x1;
    this.y1 = y1;
    this.x2 = x2;
    this.y2 = y2;
  }
  shader(fn) {
    return this.doc.ref({
      ShadingType: 2,
      ColorSpace: this._colorSpace,
      Coords: [this.x1, this.y1, this.x2, this.y2],
      Function: fn,
      Extend: [true, true]
    });
  }
  opacityGradient() {
    return new PDFLinearGradient(this.doc, this.x1, this.y1, this.x2, this.y2);
  }
}
class PDFRadialGradient extends PDFGradient {
  constructor(doc, x1, y1, r1, x2, y2, r2) {
    super(doc);
    this.doc = doc;
    this.x1 = x1;
    this.y1 = y1;
    this.r1 = r1;
    this.x2 = x2;
    this.y2 = y2;
    this.r2 = r2;
  }
  shader(fn) {
    return this.doc.ref({
      ShadingType: 3,
      ColorSpace: this._colorSpace,
      Coords: [this.x1, this.y1, this.r1, this.x2, this.y2, this.r2],
      Function: fn,
      Extend: [true, true]
    });
  }
  opacityGradient() {
    return new PDFRadialGradient(this.doc, this.x1, this.y1, this.r1, this.x2, this.y2, this.r2);
  }
}
var Gradient = {
  PDFGradient,
  PDFLinearGradient,
  PDFRadialGradient
};

/*
PDF tiling pattern support. Uncolored only.
 */

const underlyingColorSpaces = ['DeviceCMYK', 'DeviceRGB'];
class PDFTilingPattern {
  constructor(doc, bBox, xStep, yStep, stream) {
    this.doc = doc;
    this.bBox = bBox;
    this.xStep = xStep;
    this.yStep = yStep;
    this.stream = stream;
  }
  createPattern() {
    // no resources needed for our current usage
    // required entry
    const resources = this.doc.ref();
    resources.end();
    // apply default transform matrix (flipped in the default doc._ctm)
    // see document.js & gradient.js
    const [m0, m1, m2, m3, m4, m5] = this.doc._ctm;
    const [m11, m12, m21, m22, dx, dy] = [1, 0, 0, 1, 0, 0];
    const m = [m0 * m11 + m2 * m12, m1 * m11 + m3 * m12, m0 * m21 + m2 * m22, m1 * m21 + m3 * m22, m0 * dx + m2 * dy + m4, m1 * dx + m3 * dy + m5];
    const pattern = this.doc.ref({
      Type: 'Pattern',
      PatternType: 1,
      // tiling
      PaintType: 2,
      // 1-colored, 2-uncolored
      TilingType: 2,
      // 2-no distortion
      BBox: this.bBox,
      XStep: this.xStep,
      YStep: this.yStep,
      Matrix: m.map(v => +v.toFixed(5)),
      Resources: resources
    });
    pattern.end(this.stream);
    return pattern;
  }
  embedPatternColorSpaces() {
    // map each pattern to an underlying color space
    // and embed on each page
    underlyingColorSpaces.forEach(csName => {
      const csId = this.getPatternColorSpaceId(csName);
      if (this.doc.page.colorSpaces[csId]) return;
      const cs = this.doc.ref(['Pattern', csName]);
      cs.end();
      this.doc.page.colorSpaces[csId] = cs;
    });
  }
  getPatternColorSpaceId(underlyingColorspace) {
    return `CsP${underlyingColorspace}`;
  }
  embed() {
    if (!this.id) {
      this.doc._patternCount = this.doc._patternCount + 1;
      this.id = 'P' + this.doc._patternCount;
      this.pattern = this.createPattern();
    }

    // patterns are embedded in each page
    if (!this.doc.page.patterns[this.id]) {
      this.doc.page.patterns[this.id] = this.pattern;
    }
  }
  apply(stroke, patternColor) {
    // do any embedding/creating that might be needed
    this.embedPatternColorSpaces();
    this.embed();
    const normalizedColor = this.doc._normalizeColor(patternColor);
    if (!normalizedColor) throw Error(`invalid pattern color. (value: ${patternColor})`);

    // select one of the pattern color spaces
    const csId = this.getPatternColorSpaceId(this.doc._getColorSpace(normalizedColor));
    this.doc._setColorSpace(csId, stroke);

    // stroke/fill using the pattern and color (in the above underlying color space)
    const op = stroke ? 'SCN' : 'scn';
    return this.doc.addContent(`${normalizedColor.join(' ')} /${this.id} ${op}`);
  }
}
var pattern = {
  PDFTilingPattern
};

const {
  PDFGradient: PDFGradient$1,
  PDFLinearGradient: PDFLinearGradient$1,
  PDFRadialGradient: PDFRadialGradient$1
} = Gradient;
const {
  PDFTilingPattern: PDFTilingPattern$1
} = pattern;
var ColorMixin = {
  initColor() {
    // The opacity dictionaries
    this._opacityRegistry = {};
    this._opacityCount = 0;
    this._patternCount = 0;
    return this._gradCount = 0;
  },
  _normalizeColor(color) {
    if (typeof color === 'string') {
      if (color.charAt(0) === '#') {
        if (color.length === 4) {
          color = color.replace(/#([0-9A-F])([0-9A-F])([0-9A-F])/i, '#$1$1$2$2$3$3');
        }
        const hex = parseInt(color.slice(1), 16);
        color = [hex >> 16, hex >> 8 & 0xff, hex & 0xff];
      } else if (namedColors[color]) {
        color = namedColors[color];
      }
    }
    if (Array.isArray(color)) {
      // RGB
      if (color.length === 3) {
        color = color.map(part => part / 255);
        // CMYK
      } else if (color.length === 4) {
        color = color.map(part => part / 100);
      }
      return color;
    }
    return null;
  },
  _setColor(color, stroke) {
    if (color instanceof PDFGradient$1) {
      color.apply(stroke);
      return true;
      // see if tiling pattern, decode & apply it it
    } else if (Array.isArray(color) && color[0] instanceof PDFTilingPattern$1) {
      color[0].apply(stroke, color[1]);
      return true;
    }
    // any other case should be a normal color and not a pattern
    return this._setColorCore(color, stroke);
  },
  _setColorCore(color, stroke) {
    color = this._normalizeColor(color);
    if (!color) {
      return false;
    }
    const op = stroke ? 'SCN' : 'scn';
    const space = this._getColorSpace(color);
    this._setColorSpace(space, stroke);
    color = color.join(' ');
    this.addContent(`${color} ${op}`);
    return true;
  },
  _setColorSpace(space, stroke) {
    const op = stroke ? 'CS' : 'cs';
    return this.addContent(`/${space} ${op}`);
  },
  _getColorSpace(color) {
    return color.length === 4 ? 'DeviceCMYK' : 'DeviceRGB';
  },
  fillColor(color, opacity) {
    const set = this._setColor(color, false);
    if (set) {
      this.fillOpacity(opacity);
    }

    // save this for text wrapper, which needs to reset
    // the fill color on new pages
    this._fillColor = [color, opacity];
    return this;
  },
  strokeColor(color, opacity) {
    const set = this._setColor(color, true);
    if (set) {
      this.strokeOpacity(opacity);
    }
    return this;
  },
  opacity(opacity) {
    this._doOpacity(opacity, opacity);
    return this;
  },
  fillOpacity(opacity) {
    this._doOpacity(opacity, null);
    return this;
  },
  strokeOpacity(opacity) {
    this._doOpacity(null, opacity);
    return this;
  },
  _doOpacity(fillOpacity, strokeOpacity) {
    let dictionary, name;
    if (fillOpacity == null && strokeOpacity == null) {
      return;
    }
    if (fillOpacity != null) {
      fillOpacity = Math.max(0, Math.min(1, fillOpacity));
    }
    if (strokeOpacity != null) {
      strokeOpacity = Math.max(0, Math.min(1, strokeOpacity));
    }
    const key = `${fillOpacity}_${strokeOpacity}`;
    if (this._opacityRegistry[key]) {
      [dictionary, name] = this._opacityRegistry[key];
    } else {
      dictionary = {
        Type: 'ExtGState'
      };
      if (fillOpacity != null) {
        dictionary.ca = fillOpacity;
      }
      if (strokeOpacity != null) {
        dictionary.CA = strokeOpacity;
      }
      dictionary = this.ref(dictionary);
      dictionary.end();
      const id = ++this._opacityCount;
      name = `Gs${id}`;
      this._opacityRegistry[key] = [dictionary, name];
    }
    this.page.ext_gstates[name] = dictionary;
    return this.addContent(`/${name} gs`);
  },
  linearGradient(x1, y1, x2, y2) {
    return new PDFLinearGradient$1(this, x1, y1, x2, y2);
  },
  radialGradient(x1, y1, r1, x2, y2, r2) {
    return new PDFRadialGradient$1(this, x1, y1, r1, x2, y2, r2);
  },
  pattern(bbox, xStep, yStep, stream) {
    return new PDFTilingPattern$1(this, bbox, xStep, yStep, stream);
  }
};
var namedColors = {
  aliceblue: [240, 248, 255],
  antiquewhite: [250, 235, 215],
  aqua: [0, 255, 255],
  aquamarine: [127, 255, 212],
  azure: [240, 255, 255],
  beige: [245, 245, 220],
  bisque: [255, 228, 196],
  black: [0, 0, 0],
  blanchedalmond: [255, 235, 205],
  blue: [0, 0, 255],
  blueviolet: [138, 43, 226],
  brown: [165, 42, 42],
  burlywood: [222, 184, 135],
  cadetblue: [95, 158, 160],
  chartreuse: [127, 255, 0],
  chocolate: [210, 105, 30],
  coral: [255, 127, 80],
  cornflowerblue: [100, 149, 237],
  cornsilk: [255, 248, 220],
  crimson: [220, 20, 60],
  cyan: [0, 255, 255],
  darkblue: [0, 0, 139],
  darkcyan: [0, 139, 139],
  darkgoldenrod: [184, 134, 11],
  darkgray: [169, 169, 169],
  darkgreen: [0, 100, 0],
  darkgrey: [169, 169, 169],
  darkkhaki: [189, 183, 107],
  darkmagenta: [139, 0, 139],
  darkolivegreen: [85, 107, 47],
  darkorange: [255, 140, 0],
  darkorchid: [153, 50, 204],
  darkred: [139, 0, 0],
  darksalmon: [233, 150, 122],
  darkseagreen: [143, 188, 143],
  darkslateblue: [72, 61, 139],
  darkslategray: [47, 79, 79],
  darkslategrey: [47, 79, 79],
  darkturquoise: [0, 206, 209],
  darkviolet: [148, 0, 211],
  deeppink: [255, 20, 147],
  deepskyblue: [0, 191, 255],
  dimgray: [105, 105, 105],
  dimgrey: [105, 105, 105],
  dodgerblue: [30, 144, 255],
  firebrick: [178, 34, 34],
  floralwhite: [255, 250, 240],
  forestgreen: [34, 139, 34],
  fuchsia: [255, 0, 255],
  gainsboro: [220, 220, 220],
  ghostwhite: [248, 248, 255],
  gold: [255, 215, 0],
  goldenrod: [218, 165, 32],
  gray: [128, 128, 128],
  grey: [128, 128, 128],
  green: [0, 128, 0],
  greenyellow: [173, 255, 47],
  honeydew: [240, 255, 240],
  hotpink: [255, 105, 180],
  indianred: [205, 92, 92],
  indigo: [75, 0, 130],
  ivory: [255, 255, 240],
  khaki: [240, 230, 140],
  lavender: [230, 230, 250],
  lavenderblush: [255, 240, 245],
  lawngreen: [124, 252, 0],
  lemonchiffon: [255, 250, 205],
  lightblue: [173, 216, 230],
  lightcoral: [240, 128, 128],
  lightcyan: [224, 255, 255],
  lightgoldenrodyellow: [250, 250, 210],
  lightgray: [211, 211, 211],
  lightgreen: [144, 238, 144],
  lightgrey: [211, 211, 211],
  lightpink: [255, 182, 193],
  lightsalmon: [255, 160, 122],
  lightseagreen: [32, 178, 170],
  lightskyblue: [135, 206, 250],
  lightslategray: [119, 136, 153],
  lightslategrey: [119, 136, 153],
  lightsteelblue: [176, 196, 222],
  lightyellow: [255, 255, 224],
  lime: [0, 255, 0],
  limegreen: [50, 205, 50],
  linen: [250, 240, 230],
  magenta: [255, 0, 255],
  maroon: [128, 0, 0],
  mediumaquamarine: [102, 205, 170],
  mediumblue: [0, 0, 205],
  mediumorchid: [186, 85, 211],
  mediumpurple: [147, 112, 219],
  mediumseagreen: [60, 179, 113],
  mediumslateblue: [123, 104, 238],
  mediumspringgreen: [0, 250, 154],
  mediumturquoise: [72, 209, 204],
  mediumvioletred: [199, 21, 133],
  midnightblue: [25, 25, 112],
  mintcream: [245, 255, 250],
  mistyrose: [255, 228, 225],
  moccasin: [255, 228, 181],
  navajowhite: [255, 222, 173],
  navy: [0, 0, 128],
  oldlace: [253, 245, 230],
  olive: [128, 128, 0],
  olivedrab: [107, 142, 35],
  orange: [255, 165, 0],
  orangered: [255, 69, 0],
  orchid: [218, 112, 214],
  palegoldenrod: [238, 232, 170],
  palegreen: [152, 251, 152],
  paleturquoise: [175, 238, 238],
  palevioletred: [219, 112, 147],
  papayawhip: [255, 239, 213],
  peachpuff: [255, 218, 185],
  peru: [205, 133, 63],
  pink: [255, 192, 203],
  plum: [221, 160, 221],
  powderblue: [176, 224, 230],
  purple: [128, 0, 128],
  red: [255, 0, 0],
  rosybrown: [188, 143, 143],
  royalblue: [65, 105, 225],
  saddlebrown: [139, 69, 19],
  salmon: [250, 128, 114],
  sandybrown: [244, 164, 96],
  seagreen: [46, 139, 87],
  seashell: [255, 245, 238],
  sienna: [160, 82, 45],
  silver: [192, 192, 192],
  skyblue: [135, 206, 235],
  slateblue: [106, 90, 205],
  slategray: [112, 128, 144],
  slategrey: [112, 128, 144],
  snow: [255, 250, 250],
  springgreen: [0, 255, 127],
  steelblue: [70, 130, 180],
  tan: [210, 180, 140],
  teal: [0, 128, 128],
  thistle: [216, 191, 216],
  tomato: [255, 99, 71],
  turquoise: [64, 224, 208],
  violet: [238, 130, 238],
  wheat: [245, 222, 179],
  white: [255, 255, 255],
  whitesmoke: [245, 245, 245],
  yellow: [255, 255, 0],
  yellowgreen: [154, 205, 50]
};

let cx, cy, px, py, sx, sy;
cx = cy = px = py = sx = sy = 0;
const parameters = {
  A: 7,
  a: 7,
  C: 6,
  c: 6,
  H: 1,
  h: 1,
  L: 2,
  l: 2,
  M: 2,
  m: 2,
  Q: 4,
  q: 4,
  S: 4,
  s: 4,
  T: 2,
  t: 2,
  V: 1,
  v: 1,
  Z: 0,
  z: 0
};
const parse = function (path) {
  let cmd;
  const ret = [];
  let args = [];
  let curArg = '';
  let foundDecimal = false;
  let params = 0;
  for (let c of path) {
    if (parameters[c] != null) {
      params = parameters[c];
      if (cmd) {
        // save existing command
        if (curArg.length > 0) {
          args[args.length] = +curArg;
        }
        ret[ret.length] = {
          cmd,
          args
        };
        args = [];
        curArg = '';
        foundDecimal = false;
      }
      cmd = c;
    } else if ([' ', ','].includes(c) || c === '-' && curArg.length > 0 && curArg[curArg.length - 1] !== 'e' || c === '.' && foundDecimal) {
      if (curArg.length === 0) {
        continue;
      }
      if (args.length === params) {
        // handle reused commands
        ret[ret.length] = {
          cmd,
          args
        };
        args = [+curArg];

        // handle assumed commands
        if (cmd === 'M') {
          cmd = 'L';
        }
        if (cmd === 'm') {
          cmd = 'l';
        }
      } else {
        args[args.length] = +curArg;
      }
      foundDecimal = c === '.';

      // fix for negative numbers or repeated decimals with no delimeter between commands
      curArg = ['-', '.'].includes(c) ? c : '';
    } else {
      curArg += c;
      if (c === '.') {
        foundDecimal = true;
      }
    }
  }

  // add the last command
  if (curArg.length > 0) {
    if (args.length === params) {
      // handle reused commands
      ret[ret.length] = {
        cmd,
        args
      };
      args = [+curArg];

      // handle assumed commands
      if (cmd === 'M') {
        cmd = 'L';
      }
      if (cmd === 'm') {
        cmd = 'l';
      }
    } else {
      args[args.length] = +curArg;
    }
  }
  ret[ret.length] = {
    cmd,
    args
  };
  return ret;
};
const apply = function (commands, doc) {
  // current point, control point, and subpath starting point
  cx = cy = px = py = sx = sy = 0;

  // run the commands
  for (let i = 0; i < commands.length; i++) {
    const c = commands[i];
    if (typeof runners[c.cmd] === 'function') {
      runners[c.cmd](doc, c.args);
    }
  }
};
const runners = {
  M(doc, a) {
    cx = a[0];
    cy = a[1];
    px = py = null;
    sx = cx;
    sy = cy;
    return doc.moveTo(cx, cy);
  },
  m(doc, a) {
    cx += a[0];
    cy += a[1];
    px = py = null;
    sx = cx;
    sy = cy;
    return doc.moveTo(cx, cy);
  },
  C(doc, a) {
    cx = a[4];
    cy = a[5];
    px = a[2];
    py = a[3];
    return doc.bezierCurveTo(...a);
  },
  c(doc, a) {
    doc.bezierCurveTo(a[0] + cx, a[1] + cy, a[2] + cx, a[3] + cy, a[4] + cx, a[5] + cy);
    px = cx + a[2];
    py = cy + a[3];
    cx += a[4];
    return cy += a[5];
  },
  S(doc, a) {
    if (px === null) {
      px = cx;
      py = cy;
    }
    doc.bezierCurveTo(cx - (px - cx), cy - (py - cy), a[0], a[1], a[2], a[3]);
    px = a[0];
    py = a[1];
    cx = a[2];
    return cy = a[3];
  },
  s(doc, a) {
    if (px === null) {
      px = cx;
      py = cy;
    }
    doc.bezierCurveTo(cx - (px - cx), cy - (py - cy), cx + a[0], cy + a[1], cx + a[2], cy + a[3]);
    px = cx + a[0];
    py = cy + a[1];
    cx += a[2];
    return cy += a[3];
  },
  Q(doc, a) {
    px = a[0];
    py = a[1];
    cx = a[2];
    cy = a[3];
    return doc.quadraticCurveTo(a[0], a[1], cx, cy);
  },
  q(doc, a) {
    doc.quadraticCurveTo(a[0] + cx, a[1] + cy, a[2] + cx, a[3] + cy);
    px = cx + a[0];
    py = cy + a[1];
    cx += a[2];
    return cy += a[3];
  },
  T(doc, a) {
    if (px === null) {
      px = cx;
      py = cy;
    } else {
      px = cx - (px - cx);
      py = cy - (py - cy);
    }
    doc.quadraticCurveTo(px, py, a[0], a[1]);
    px = cx - (px - cx);
    py = cy - (py - cy);
    cx = a[0];
    return cy = a[1];
  },
  t(doc, a) {
    if (px === null) {
      px = cx;
      py = cy;
    } else {
      px = cx - (px - cx);
      py = cy - (py - cy);
    }
    doc.quadraticCurveTo(px, py, cx + a[0], cy + a[1]);
    cx += a[0];
    return cy += a[1];
  },
  A(doc, a) {
    solveArc(doc, cx, cy, a);
    cx = a[5];
    return cy = a[6];
  },
  a(doc, a) {
    a[5] += cx;
    a[6] += cy;
    solveArc(doc, cx, cy, a);
    cx = a[5];
    return cy = a[6];
  },
  L(doc, a) {
    cx = a[0];
    cy = a[1];
    px = py = null;
    return doc.lineTo(cx, cy);
  },
  l(doc, a) {
    cx += a[0];
    cy += a[1];
    px = py = null;
    return doc.lineTo(cx, cy);
  },
  H(doc, a) {
    cx = a[0];
    px = py = null;
    return doc.lineTo(cx, cy);
  },
  h(doc, a) {
    cx += a[0];
    px = py = null;
    return doc.lineTo(cx, cy);
  },
  V(doc, a) {
    cy = a[0];
    px = py = null;
    return doc.lineTo(cx, cy);
  },
  v(doc, a) {
    cy += a[0];
    px = py = null;
    return doc.lineTo(cx, cy);
  },
  Z(doc) {
    doc.closePath();
    cx = sx;
    return cy = sy;
  },
  z(doc) {
    doc.closePath();
    cx = sx;
    return cy = sy;
  }
};
const solveArc = function (doc, x, y, coords) {
  const [rx, ry, rot, large, sweep, ex, ey] = coords;
  const segs = arcToSegments(ex, ey, rx, ry, large, sweep, rot, x, y);
  for (let seg of segs) {
    const bez = segmentToBezier(...seg);
    doc.bezierCurveTo(...bez);
  }
};

// from Inkscape svgtopdf, thanks!
const arcToSegments = function (x, y, rx, ry, large, sweep, rotateX, ox, oy) {
  const th = rotateX * (Math.PI / 180);
  const sin_th = Math.sin(th);
  const cos_th = Math.cos(th);
  rx = Math.abs(rx);
  ry = Math.abs(ry);
  px = cos_th * (ox - x) * 0.5 + sin_th * (oy - y) * 0.5;
  py = cos_th * (oy - y) * 0.5 - sin_th * (ox - x) * 0.5;
  let pl = px * px / (rx * rx) + py * py / (ry * ry);
  if (pl > 1) {
    pl = Math.sqrt(pl);
    rx *= pl;
    ry *= pl;
  }
  const a00 = cos_th / rx;
  const a01 = sin_th / rx;
  const a10 = -sin_th / ry;
  const a11 = cos_th / ry;
  const x0 = a00 * ox + a01 * oy;
  const y0 = a10 * ox + a11 * oy;
  const x1 = a00 * x + a01 * y;
  const y1 = a10 * x + a11 * y;
  const d = (x1 - x0) * (x1 - x0) + (y1 - y0) * (y1 - y0);
  let sfactor_sq = 1 / d - 0.25;
  if (sfactor_sq < 0) {
    sfactor_sq = 0;
  }
  let sfactor = Math.sqrt(sfactor_sq);
  if (sweep === large) {
    sfactor = -sfactor;
  }
  const xc = 0.5 * (x0 + x1) - sfactor * (y1 - y0);
  const yc = 0.5 * (y0 + y1) + sfactor * (x1 - x0);
  const th0 = Math.atan2(y0 - yc, x0 - xc);
  const th1 = Math.atan2(y1 - yc, x1 - xc);
  let th_arc = th1 - th0;
  if (th_arc < 0 && sweep === 1) {
    th_arc += 2 * Math.PI;
  } else if (th_arc > 0 && sweep === 0) {
    th_arc -= 2 * Math.PI;
  }
  const segments = Math.ceil(Math.abs(th_arc / (Math.PI * 0.5 + 0.001)));
  const result = [];
  for (let i = 0; i < segments; i++) {
    const th2 = th0 + i * th_arc / segments;
    const th3 = th0 + (i + 1) * th_arc / segments;
    result[i] = [xc, yc, th2, th3, rx, ry, sin_th, cos_th];
  }
  return result;
};
const segmentToBezier = function (cx, cy, th0, th1, rx, ry, sin_th, cos_th) {
  const a00 = cos_th * rx;
  const a01 = -sin_th * ry;
  const a10 = sin_th * rx;
  const a11 = cos_th * ry;
  const th_half = 0.5 * (th1 - th0);
  const t = 8 / 3 * Math.sin(th_half * 0.5) * Math.sin(th_half * 0.5) / Math.sin(th_half);
  const x1 = cx + Math.cos(th0) - t * Math.sin(th0);
  const y1 = cy + Math.sin(th0) + t * Math.cos(th0);
  const x3 = cx + Math.cos(th1);
  const y3 = cy + Math.sin(th1);
  const x2 = x3 + t * Math.sin(th1);
  const y2 = y3 - t * Math.cos(th1);
  return [a00 * x1 + a01 * y1, a10 * x1 + a11 * y1, a00 * x2 + a01 * y2, a10 * x2 + a11 * y2, a00 * x3 + a01 * y3, a10 * x3 + a11 * y3];
};
class SVGPath {
  static apply(doc, path) {
    const commands = parse(path);
    apply(commands, doc);
  }
}

const {
  number: number$1
} = PDFObject;

// This constant is used to approximate a symmetrical arc using a cubic
// Bezier curve.
const KAPPA = 4.0 * ((Math.sqrt(2) - 1.0) / 3.0);
var VectorMixin = {
  initVector() {
    this._ctm = [1, 0, 0, 1, 0, 0]; // current transformation matrix
    return this._ctmStack = [];
  },
  save() {
    this._ctmStack.push(this._ctm.slice());
    // TODO: save/restore colorspace and styles so not setting it unnessesarily all the time?
    return this.addContent('q');
  },
  restore() {
    this._ctm = this._ctmStack.pop() || [1, 0, 0, 1, 0, 0];
    return this.addContent('Q');
  },
  closePath() {
    return this.addContent('h');
  },
  lineWidth(w) {
    return this.addContent(`${number$1(w)} w`);
  },
  _CAP_STYLES: {
    BUTT: 0,
    ROUND: 1,
    SQUARE: 2
  },
  lineCap(c) {
    if (typeof c === 'string') {
      c = this._CAP_STYLES[c.toUpperCase()];
    }
    return this.addContent(`${c} J`);
  },
  _JOIN_STYLES: {
    MITER: 0,
    ROUND: 1,
    BEVEL: 2
  },
  lineJoin(j) {
    if (typeof j === 'string') {
      j = this._JOIN_STYLES[j.toUpperCase()];
    }
    return this.addContent(`${j} j`);
  },
  miterLimit(m) {
    return this.addContent(`${number$1(m)} M`);
  },
  dash(length, options = {}) {
    const originalLength = length;
    if (!Array.isArray(length)) {
      length = [length, options.space || length];
    }
    const valid = length.every(x => Number.isFinite(x) && x > 0);
    if (!valid) {
      throw new Error(`dash(${JSON.stringify(originalLength)}, ${JSON.stringify(options)}) invalid, lengths must be numeric and greater than zero`);
    }
    length = length.map(number$1).join(' ');
    return this.addContent(`[${length}] ${number$1(options.phase || 0)} d`);
  },
  undash() {
    return this.addContent('[] 0 d');
  },
  moveTo(x, y) {
    return this.addContent(`${number$1(x)} ${number$1(y)} m`);
  },
  lineTo(x, y) {
    return this.addContent(`${number$1(x)} ${number$1(y)} l`);
  },
  bezierCurveTo(cp1x, cp1y, cp2x, cp2y, x, y) {
    return this.addContent(`${number$1(cp1x)} ${number$1(cp1y)} ${number$1(cp2x)} ${number$1(cp2y)} ${number$1(x)} ${number$1(y)} c`);
  },
  quadraticCurveTo(cpx, cpy, x, y) {
    return this.addContent(`${number$1(cpx)} ${number$1(cpy)} ${number$1(x)} ${number$1(y)} v`);
  },
  rect(x, y, w, h) {
    return this.addContent(`${number$1(x)} ${number$1(y)} ${number$1(w)} ${number$1(h)} re`);
  },
  roundedRect(x, y, w, h, r) {
    if (r == null) {
      r = 0;
    }
    r = Math.min(r, 0.5 * w, 0.5 * h);

    // amount to inset control points from corners (see `ellipse`)
    const c = r * (1.0 - KAPPA);
    this.moveTo(x + r, y);
    this.lineTo(x + w - r, y);
    this.bezierCurveTo(x + w - c, y, x + w, y + c, x + w, y + r);
    this.lineTo(x + w, y + h - r);
    this.bezierCurveTo(x + w, y + h - c, x + w - c, y + h, x + w - r, y + h);
    this.lineTo(x + r, y + h);
    this.bezierCurveTo(x + c, y + h, x, y + h - c, x, y + h - r);
    this.lineTo(x, y + r);
    this.bezierCurveTo(x, y + c, x + c, y, x + r, y);
    return this.closePath();
  },
  ellipse(x, y, r1, r2) {
    // based on http://stackoverflow.com/questions/2172798/how-to-draw-an-oval-in-html5-canvas/2173084#2173084
    if (r2 == null) {
      r2 = r1;
    }
    x -= r1;
    y -= r2;
    const ox = r1 * KAPPA;
    const oy = r2 * KAPPA;
    const xe = x + r1 * 2;
    const ye = y + r2 * 2;
    const xm = x + r1;
    const ym = y + r2;
    this.moveTo(x, ym);
    this.bezierCurveTo(x, ym - oy, xm - ox, y, xm, y);
    this.bezierCurveTo(xm + ox, y, xe, ym - oy, xe, ym);
    this.bezierCurveTo(xe, ym + oy, xm + ox, ye, xm, ye);
    this.bezierCurveTo(xm - ox, ye, x, ym + oy, x, ym);
    return this.closePath();
  },
  circle(x, y, radius) {
    return this.ellipse(x, y, radius);
  },
  arc(x, y, radius, startAngle, endAngle, anticlockwise) {
    if (anticlockwise == null) {
      anticlockwise = false;
    }
    const TWO_PI = 2.0 * Math.PI;
    const HALF_PI = 0.5 * Math.PI;
    let deltaAng = endAngle - startAngle;
    if (Math.abs(deltaAng) > TWO_PI) {
      // draw only full circle if more than that is specified
      deltaAng = TWO_PI;
    } else if (deltaAng !== 0 && anticlockwise !== deltaAng < 0) {
      // necessary to flip direction of rendering
      const dir = anticlockwise ? -1 : 1;
      deltaAng = dir * TWO_PI + deltaAng;
    }
    const numSegs = Math.ceil(Math.abs(deltaAng) / HALF_PI);
    const segAng = deltaAng / numSegs;
    const handleLen = segAng / HALF_PI * KAPPA * radius;
    let curAng = startAngle;

    // component distances between anchor point and control point
    let deltaCx = -Math.sin(curAng) * handleLen;
    let deltaCy = Math.cos(curAng) * handleLen;

    // anchor point
    let ax = x + Math.cos(curAng) * radius;
    let ay = y + Math.sin(curAng) * radius;

    // calculate and render segments
    this.moveTo(ax, ay);
    for (let segIdx = 0; segIdx < numSegs; segIdx++) {
      // starting control point
      const cp1x = ax + deltaCx;
      const cp1y = ay + deltaCy;

      // step angle
      curAng += segAng;

      // next anchor point
      ax = x + Math.cos(curAng) * radius;
      ay = y + Math.sin(curAng) * radius;

      // next control point delta
      deltaCx = -Math.sin(curAng) * handleLen;
      deltaCy = Math.cos(curAng) * handleLen;

      // ending control point
      const cp2x = ax - deltaCx;
      const cp2y = ay - deltaCy;

      // render segment
      this.bezierCurveTo(cp1x, cp1y, cp2x, cp2y, ax, ay);
    }
    return this;
  },
  polygon(...points) {
    this.moveTo(...(points.shift() || []));
    for (let point of points) {
      this.lineTo(...(point || []));
    }
    return this.closePath();
  },
  path(path) {
    SVGPath.apply(this, path);
    return this;
  },
  _windingRule(rule) {
    if (/even-?odd/.test(rule)) {
      return '*';
    }
    return '';
  },
  fill(color, rule) {
    if (/(even-?odd)|(non-?zero)/.test(color)) {
      rule = color;
      color = null;
    }
    if (color) {
      this.fillColor(color);
    }
    return this.addContent(`f${this._windingRule(rule)}`);
  },
  stroke(color) {
    if (color) {
      this.strokeColor(color);
    }
    return this.addContent('S');
  },
  fillAndStroke(fillColor, strokeColor, rule) {
    if (strokeColor == null) {
      strokeColor = fillColor;
    }
    const isFillRule = /(even-?odd)|(non-?zero)/;
    if (isFillRule.test(fillColor)) {
      rule = fillColor;
      fillColor = null;
    }
    if (isFillRule.test(strokeColor)) {
      rule = strokeColor;
      strokeColor = fillColor;
    }
    if (fillColor) {
      this.fillColor(fillColor);
      this.strokeColor(strokeColor);
    }
    return this.addContent(`B${this._windingRule(rule)}`);
  },
  clip(rule) {
    return this.addContent(`W${this._windingRule(rule)} n`);
  },
  transform(m11, m12, m21, m22, dx, dy) {
    // keep track of the current transformation matrix
    if (m11 === 1 && m12 === 0 && m21 === 0 && m22 === 1 && dx === 0 && dy === 0) {
      // Ignore identity transforms
      return this;
    }
    const m = this._ctm;
    const [m0, m1, m2, m3, m4, m5] = m;
    m[0] = m0 * m11 + m2 * m12;
    m[1] = m1 * m11 + m3 * m12;
    m[2] = m0 * m21 + m2 * m22;
    m[3] = m1 * m21 + m3 * m22;
    m[4] = m0 * dx + m2 * dy + m4;
    m[5] = m1 * dx + m3 * dy + m5;
    const values = [m11, m12, m21, m22, dx, dy].map(v => number$1(v)).join(' ');
    return this.addContent(`${values} cm`);
  },
  translate(x, y) {
    return this.transform(1, 0, 0, 1, x, y);
  },
  rotate(angle, options = {}) {
    let y;
    const rad = angle * Math.PI / 180;
    const cos = Math.cos(rad);
    const sin = Math.sin(rad);
    let x = y = 0;
    if (options.origin != null) {
      [x, y] = options.origin;
      const x1 = x * cos - y * sin;
      const y1 = x * sin + y * cos;
      x -= x1;
      y -= y1;
    }
    return this.transform(cos, sin, -sin, cos, x, y);
  },
  scale(xFactor, yFactor, options = {}) {
    let y;
    if (yFactor == null) {
      yFactor = xFactor;
    }
    if (typeof yFactor === 'object') {
      options = yFactor;
      yFactor = xFactor;
    }
    let x = y = 0;
    if (options.origin != null) {
      [x, y] = options.origin;
      x -= xFactor * x;
      y -= yFactor * y;
    }
    return this.transform(xFactor, 0, 0, yFactor, x, y);
  }
};

const WIN_ANSI_MAP = {
  402: 131,
  8211: 150,
  8212: 151,
  8216: 145,
  8217: 146,
  8218: 130,
  8220: 147,
  8221: 148,
  8222: 132,
  8224: 134,
  8225: 135,
  8226: 149,
  8230: 133,
  8364: 128,
  8240: 137,
  8249: 139,
  8250: 155,
  710: 136,
  8482: 153,
  338: 140,
  339: 156,
  732: 152,
  352: 138,
  353: 154,
  376: 159,
  381: 142,
  382: 158
};
const characters = `\
.notdef       .notdef        .notdef        .notdef
.notdef       .notdef        .notdef        .notdef
.notdef       .notdef        .notdef        .notdef
.notdef       .notdef        .notdef        .notdef
.notdef       .notdef        .notdef        .notdef
.notdef       .notdef        .notdef        .notdef
.notdef       .notdef        .notdef        .notdef
.notdef       .notdef        .notdef        .notdef
  
space         exclam         quotedbl       numbersign
dollar        percent        ampersand      quotesingle
parenleft     parenright     asterisk       plus
comma         hyphen         period         slash
zero          one            two            three
four          five           six            seven
eight         nine           colon          semicolon
less          equal          greater        question
  
at            A              B              C
D             E              F              G
H             I              J              K
L             M              N              O
P             Q              R              S
T             U              V              W
X             Y              Z              bracketleft
backslash     bracketright   asciicircum    underscore
  
grave         a              b              c
d             e              f              g
h             i              j              k
l             m              n              o
p             q              r              s
t             u              v              w
x             y              z              braceleft
bar           braceright     asciitilde     .notdef
  
Euro          .notdef        quotesinglbase florin
quotedblbase  ellipsis       dagger         daggerdbl
circumflex    perthousand    Scaron         guilsinglleft
OE            .notdef        Zcaron         .notdef
.notdef       quoteleft      quoteright     quotedblleft
quotedblright bullet         endash         emdash
tilde         trademark      scaron         guilsinglright
oe            .notdef        zcaron         ydieresis
  
space         exclamdown     cent           sterling
currency      yen            brokenbar      section
dieresis      copyright      ordfeminine    guillemotleft
logicalnot    hyphen         registered     macron
degree        plusminus      twosuperior    threesuperior
acute         mu             paragraph      periodcentered
cedilla       onesuperior    ordmasculine   guillemotright
onequarter    onehalf        threequarters  questiondown
  
Agrave        Aacute         Acircumflex    Atilde
Adieresis     Aring          AE             Ccedilla
Egrave        Eacute         Ecircumflex    Edieresis
Igrave        Iacute         Icircumflex    Idieresis
Eth           Ntilde         Ograve         Oacute
Ocircumflex   Otilde         Odieresis      multiply
Oslash        Ugrave         Uacute         Ucircumflex
Udieresis     Yacute         Thorn          germandbls
  
agrave        aacute         acircumflex    atilde
adieresis     aring          ae             ccedilla
egrave        eacute         ecircumflex    edieresis
igrave        iacute         icircumflex    idieresis
eth           ntilde         ograve         oacute
ocircumflex   otilde         odieresis      divide
oslash        ugrave         uacute         ucircumflex
udieresis     yacute         thorn          ydieresis\
`.split(/\s+/);
class AFMFont {
  static open(filename) {
    return new AFMFont(fs.readFileSync(filename, 'utf8'));
  }
  constructor(contents) {
    this.contents = contents;
    this.attributes = {};
    this.glyphWidths = {};
    this.boundingBoxes = {};
    this.kernPairs = {};
    this.parse();
    // todo: remove charWidths since appears to not be used
    this.charWidths = new Array(256);
    for (let char = 0; char <= 255; char++) {
      this.charWidths[char] = this.glyphWidths[characters[char]];
    }
    this.bbox = this.attributes['FontBBox'].split(/\s+/).map(e => +e);
    this.ascender = +(this.attributes['Ascender'] || 0);
    this.descender = +(this.attributes['Descender'] || 0);
    this.xHeight = +(this.attributes['XHeight'] || 0);
    this.capHeight = +(this.attributes['CapHeight'] || 0);
    this.lineGap = this.bbox[3] - this.bbox[1] - (this.ascender - this.descender);
  }
  parse() {
    let section = '';
    for (let line of this.contents.split('\n')) {
      var match;
      var a;
      if (match = line.match(/^Start(\w+)/)) {
        section = match[1];
        continue;
      } else if (match = line.match(/^End(\w+)/)) {
        section = '';
        continue;
      }
      switch (section) {
        case 'FontMetrics':
          match = line.match(/(^\w+)\s+(.*)/);
          var key = match[1];
          var value = match[2];
          if (a = this.attributes[key]) {
            if (!Array.isArray(a)) {
              a = this.attributes[key] = [a];
            }
            a.push(value);
          } else {
            this.attributes[key] = value;
          }
          break;
        case 'CharMetrics':
          if (!/^CH?\s/.test(line)) {
            continue;
          }
          var name = line.match(/\bN\s+(\.?\w+)\s*;/)[1];
          this.glyphWidths[name] = +line.match(/\bWX\s+(\d+)\s*;/)[1];
          break;
        case 'KernPairs':
          match = line.match(/^KPX\s+(\.?\w+)\s+(\.?\w+)\s+(-?\d+)/);
          if (match) {
            this.kernPairs[match[1] + '\0' + match[2]] = parseInt(match[3]);
          }
          break;
      }
    }
  }
  encodeText(text) {
    const res = [];
    for (let i = 0, len = text.length; i < len; i++) {
      let char = text.charCodeAt(i);
      char = WIN_ANSI_MAP[char] || char;
      res.push(char.toString(16));
    }
    return res;
  }
  glyphsForString(string) {
    const glyphs = [];
    for (let i = 0, len = string.length; i < len; i++) {
      const charCode = string.charCodeAt(i);
      glyphs.push(this.characterToGlyph(charCode));
    }
    return glyphs;
  }
  characterToGlyph(character) {
    return characters[WIN_ANSI_MAP[character] || character] || '.notdef';
  }
  widthOfGlyph(glyph) {
    return this.glyphWidths[glyph] || 0;
  }
  getKernPair(left, right) {
    return this.kernPairs[left + '\0' + right] || 0;
  }
  advancesForGlyphs(glyphs) {
    const advances = [];
    for (let index = 0; index < glyphs.length; index++) {
      const left = glyphs[index];
      const right = glyphs[index + 1];
      advances.push(this.widthOfGlyph(left) + this.getKernPair(left, right));
    }
    return advances;
  }
}

class PDFFont {
  constructor() {}
  encode() {
    throw new Error('Must be implemented by subclasses');
  }
  widthOfString() {
    throw new Error('Must be implemented by subclasses');
  }
  ref() {
    return this.dictionary != null ? this.dictionary : this.dictionary = this.document.ref();
  }
  finalize() {
    if (this.embedded || this.dictionary == null) {
      return;
    }
    this.embed();
    return this.embedded = true;
  }
  embed() {
    throw new Error('Must be implemented by subclasses');
  }
  lineHeight(size, includeGap) {
    if (includeGap == null) {
      includeGap = false;
    }
    const gap = includeGap ? this.lineGap : 0;
    return (this.ascender + gap - this.descender) / 1000 * size;
  }
}

// This insanity is so bundlers can inline the font files
const STANDARD_FONTS = {
  Courier() {
    return fs.readFileSync(__dirname + '/data/Courier.afm', 'utf8');
  },
  'Courier-Bold'() {
    return fs.readFileSync(__dirname + '/data/Courier-Bold.afm', 'utf8');
  },
  'Courier-Oblique'() {
    return fs.readFileSync(__dirname + '/data/Courier-Oblique.afm', 'utf8');
  },
  'Courier-BoldOblique'() {
    return fs.readFileSync(__dirname + '/data/Courier-BoldOblique.afm', 'utf8');
  },
  Helvetica() {
    return fs.readFileSync(__dirname + '/data/Helvetica.afm', 'utf8');
  },
  'Helvetica-Bold'() {
    return fs.readFileSync(__dirname + '/data/Helvetica-Bold.afm', 'utf8');
  },
  'Helvetica-Oblique'() {
    return fs.readFileSync(__dirname + '/data/Helvetica-Oblique.afm', 'utf8');
  },
  'Helvetica-BoldOblique'() {
    return fs.readFileSync(__dirname + '/data/Helvetica-BoldOblique.afm', 'utf8');
  },
  'Times-Roman'() {
    return fs.readFileSync(__dirname + '/data/Times-Roman.afm', 'utf8');
  },
  'Times-Bold'() {
    return fs.readFileSync(__dirname + '/data/Times-Bold.afm', 'utf8');
  },
  'Times-Italic'() {
    return fs.readFileSync(__dirname + '/data/Times-Italic.afm', 'utf8');
  },
  'Times-BoldItalic'() {
    return fs.readFileSync(__dirname + '/data/Times-BoldItalic.afm', 'utf8');
  },
  Symbol() {
    return fs.readFileSync(__dirname + '/data/Symbol.afm', 'utf8');
  },
  ZapfDingbats() {
    return fs.readFileSync(__dirname + '/data/ZapfDingbats.afm', 'utf8');
  }
};
class StandardFont extends PDFFont {
  constructor(document, name, id) {
    super();
    this.document = document;
    this.name = name;
    this.id = id;
    this.font = new AFMFont(STANDARD_FONTS[this.name]());
    ({
      ascender: this.ascender,
      descender: this.descender,
      bbox: this.bbox,
      lineGap: this.lineGap,
      xHeight: this.xHeight,
      capHeight: this.capHeight
    } = this.font);
  }
  embed() {
    this.dictionary.data = {
      Type: 'Font',
      BaseFont: this.name,
      Subtype: 'Type1',
      Encoding: 'WinAnsiEncoding'
    };
    return this.dictionary.end();
  }
  encode(text) {
    const encoded = this.font.encodeText(text);
    const glyphs = this.font.glyphsForString(`${text}`);
    const advances = this.font.advancesForGlyphs(glyphs);
    const positions = [];
    for (let i = 0; i < glyphs.length; i++) {
      const glyph = glyphs[i];
      positions.push({
        xAdvance: advances[i],
        yAdvance: 0,
        xOffset: 0,
        yOffset: 0,
        advanceWidth: this.font.widthOfGlyph(glyph)
      });
    }
    return [encoded, positions];
  }
  widthOfString(string, size) {
    const glyphs = this.font.glyphsForString(`${string}`);
    const advances = this.font.advancesForGlyphs(glyphs);
    let width = 0;
    for (let advance of advances) {
      width += advance;
    }
    const scale = size / 1000;
    return width * scale;
  }
  static isStandardFont(name) {
    return name in STANDARD_FONTS;
  }
}

const toHex = function (num) {
  return `0000${num.toString(16)}`.slice(-4);
};
class EmbeddedFont extends PDFFont {
  constructor(document, font, id) {
    super();
    this.document = document;
    this.font = font;
    this.id = id;
    this.subset = this.font.createSubset();
    this.unicode = [[0]];
    this.widths = [this.font.getGlyph(0).advanceWidth];
    this.name = this.font.postscriptName;
    this.scale = 1000 / this.font.unitsPerEm;
    this.ascender = this.font.ascent * this.scale;
    this.descender = this.font.descent * this.scale;
    this.xHeight = this.font.xHeight * this.scale;
    this.capHeight = this.font.capHeight * this.scale;
    this.lineGap = this.font.lineGap * this.scale;
    this.bbox = this.font.bbox;
    if (document.options.fontLayoutCache !== false) {
      this.layoutCache = Object.create(null);
    }
  }
  layoutRun(text, features) {
    const run = this.font.layout(text, features);

    // Normalize position values
    for (let i = 0; i < run.positions.length; i++) {
      const position = run.positions[i];
      for (let key in position) {
        position[key] *= this.scale;
      }
      position.advanceWidth = run.glyphs[i].advanceWidth * this.scale;
    }
    return run;
  }
  layoutCached(text) {
    if (!this.layoutCache) {
      return this.layoutRun(text);
    }
    let cached;
    if (cached = this.layoutCache[text]) {
      return cached;
    }
    const run = this.layoutRun(text);
    this.layoutCache[text] = run;
    return run;
  }
  layout(text, features, onlyWidth) {
    // Skip the cache if any user defined features are applied
    if (features) {
      return this.layoutRun(text, features);
    }
    let glyphs = onlyWidth ? null : [];
    let positions = onlyWidth ? null : [];
    let advanceWidth = 0;

    // Split the string by words to increase cache efficiency.
    // For this purpose, spaces and tabs are a good enough delimeter.
    let last = 0;
    let index = 0;
    while (index <= text.length) {
      var needle;
      if (index === text.length && last < index || (needle = text.charAt(index), [' ', '\t'].includes(needle))) {
        const run = this.layoutCached(text.slice(last, ++index));
        if (!onlyWidth) {
          glyphs = glyphs.concat(run.glyphs);
          positions = positions.concat(run.positions);
        }
        advanceWidth += run.advanceWidth;
        last = index;
      } else {
        index++;
      }
    }
    return {
      glyphs,
      positions,
      advanceWidth
    };
  }
  encode(text, features) {
    const {
      glyphs,
      positions
    } = this.layout(text, features);
    const res = [];
    for (let i = 0; i < glyphs.length; i++) {
      const glyph = glyphs[i];
      const gid = this.subset.includeGlyph(glyph.id);
      res.push(`0000${gid.toString(16)}`.slice(-4));
      if (this.widths[gid] == null) {
        this.widths[gid] = glyph.advanceWidth * this.scale;
      }
      if (this.unicode[gid] == null) {
        this.unicode[gid] = glyph.codePoints;
      }
    }
    return [res, positions];
  }
  widthOfString(string, size, features) {
    const width = this.layout(string, features, true).advanceWidth;
    const scale = size / 1000;
    return width * scale;
  }
  embed() {
    const isCFF = this.subset.cff != null;
    const fontFile = this.document.ref();
    if (isCFF) {
      fontFile.data.Subtype = 'CIDFontType0C';
    }
    this.subset.encodeStream().on('data', data => fontFile.write(data)).on('end', () => fontFile.end());
    const familyClass = ((this.font['OS/2'] != null ? this.font['OS/2'].sFamilyClass : undefined) || 0) >> 8;
    let flags = 0;
    if (this.font.post.isFixedPitch) {
      flags |= 1 << 0;
    }
    if (1 <= familyClass && familyClass <= 7) {
      flags |= 1 << 1;
    }
    flags |= 1 << 2; // assume the font uses non-latin characters
    if (familyClass === 10) {
      flags |= 1 << 3;
    }
    if (this.font.head.macStyle.italic) {
      flags |= 1 << 6;
    }

    // generate a tag (6 uppercase letters. 17 is the char code offset from '0' to 'A'. 73 will map to 'Z')
    const tag = [1, 2, 3, 4, 5, 6].map(i => String.fromCharCode((this.id.charCodeAt(i) || 73) + 17)).join('');
    const name = tag + '+' + this.font.postscriptName;
    const {
      bbox
    } = this.font;
    const descriptor = this.document.ref({
      Type: 'FontDescriptor',
      FontName: name,
      Flags: flags,
      FontBBox: [bbox.minX * this.scale, bbox.minY * this.scale, bbox.maxX * this.scale, bbox.maxY * this.scale],
      ItalicAngle: this.font.italicAngle,
      Ascent: this.ascender,
      Descent: this.descender,
      CapHeight: (this.font.capHeight || this.font.ascent) * this.scale,
      XHeight: (this.font.xHeight || 0) * this.scale,
      StemV: 0
    }); // not sure how to calculate this

    if (isCFF) {
      descriptor.data.FontFile3 = fontFile;
    } else {
      descriptor.data.FontFile2 = fontFile;
    }
    if (this.document.subset && this.document.subset === 1) {
      const CIDSet = Buffer.from('FFFFFFFFC0', 'hex');
      const CIDSetRef = this.document.ref();
      CIDSetRef.write(CIDSet);
      CIDSetRef.end();
      descriptor.data.CIDSet = CIDSetRef;
    }
    descriptor.end();
    const descendantFontData = {
      Type: 'Font',
      Subtype: 'CIDFontType0',
      BaseFont: name,
      CIDSystemInfo: {
        Registry: new String('Adobe'),
        Ordering: new String('Identity'),
        Supplement: 0
      },
      FontDescriptor: descriptor,
      W: [0, this.widths]
    };
    if (!isCFF) {
      descendantFontData.Subtype = 'CIDFontType2';
      descendantFontData.CIDToGIDMap = 'Identity';
    }
    const descendantFont = this.document.ref(descendantFontData);
    descendantFont.end();
    this.dictionary.data = {
      Type: 'Font',
      Subtype: 'Type0',
      BaseFont: name,
      Encoding: 'Identity-H',
      DescendantFonts: [descendantFont],
      ToUnicode: this.toUnicodeCmap()
    };
    return this.dictionary.end();
  }

  // Maps the glyph ids encoded in the PDF back to unicode strings
  // Because of ligature substitutions and the like, there may be one or more
  // unicode characters represented by each glyph.
  toUnicodeCmap() {
    const cmap = this.document.ref();
    const entries = [];
    for (let codePoints of this.unicode) {
      const encoded = [];

      // encode codePoints to utf16
      for (let value of codePoints) {
        if (value > 0xffff) {
          value -= 0x10000;
          encoded.push(toHex(value >>> 10 & 0x3ff | 0xd800));
          value = 0xdc00 | value & 0x3ff;
        }
        encoded.push(toHex(value));
      }
      entries.push(`<${encoded.join(' ')}>`);
    }
    const chunkSize = 256;
    const chunks = Math.ceil(entries.length / chunkSize);
    const ranges = [];
    for (let i = 0; i < chunks; i++) {
      const start = i * chunkSize;
      const end = Math.min((i + 1) * chunkSize, entries.length);
      ranges.push(`<${toHex(start)}> <${toHex(end - 1)}> [${entries.slice(start, end).join(' ')}]`);
    }
    cmap.end(`\
/CIDInit /ProcSet findresource begin
12 dict begin
begincmap
/CIDSystemInfo <<
  /Registry (Adobe)
  /Ordering (UCS)
  /Supplement 0
>> def
/CMapName /Adobe-Identity-UCS def
/CMapType 2 def
1 begincodespacerange
<0000><ffff>
endcodespacerange
1 beginbfrange
${ranges.join('\n')}
endbfrange
endcmap
CMapName currentdict /CMap defineresource pop
end
end\
`);
    return cmap;
  }
}

class PDFFontFactory {
  static open(document, src, family, id) {
    let font;
    if (typeof src === 'string') {
      if (StandardFont.isStandardFont(src)) {
        return new StandardFont(document, src, id);
      }
      src = fs.readFileSync(src);
    }
    if (Buffer.isBuffer(src)) {
      font = fontkit.create(src, family);
    } else if (src instanceof Uint8Array) {
      font = fontkit.create(Buffer.from(src), family);
    } else if (src instanceof ArrayBuffer) {
      font = fontkit.create(Buffer.from(new Uint8Array(src)), family);
    }
    if (font == null) {
      throw new Error('Not a supported font format or standard PDF font.');
    }
    return new EmbeddedFont(document, font, id);
  }
}

var FontsMixin = {
  initFonts(defaultFont = 'Helvetica') {
    // Lookup table for embedded fonts
    this._fontFamilies = {};
    this._fontCount = 0;

    // Font state
    this._fontSize = 12;
    this._font = null;
    this._registeredFonts = {};

    // Set the default font
    if (defaultFont) {
      this.font(defaultFont);
    }
  },
  font(src, family, size) {
    let cacheKey, font;
    if (typeof family === 'number') {
      size = family;
      family = null;
    }

    // check registered fonts if src is a string
    if (typeof src === 'string' && this._registeredFonts[src]) {
      cacheKey = src;
      ({
        src,
        family
      } = this._registeredFonts[src]);
    } else {
      cacheKey = family || src;
      if (typeof cacheKey !== 'string') {
        cacheKey = null;
      }
    }
    if (size != null) {
      this.fontSize(size);
    }

    // fast path: check if the font is already in the PDF
    if (font = this._fontFamilies[cacheKey]) {
      this._font = font;
      return this;
    }

    // load the font
    const id = `F${++this._fontCount}`;
    this._font = PDFFontFactory.open(this, src, family, id);

    // check for existing font familes with the same name already in the PDF
    // useful if the font was passed as a buffer
    if (font = this._fontFamilies[this._font.name]) {
      this._font = font;
      return this;
    }

    // save the font for reuse later
    if (cacheKey) {
      this._fontFamilies[cacheKey] = this._font;
    }
    if (this._font.name) {
      this._fontFamilies[this._font.name] = this._font;
    }
    return this;
  },
  fontSize(_fontSize) {
    this._fontSize = _fontSize;
    return this;
  },
  currentLineHeight(includeGap) {
    if (includeGap == null) {
      includeGap = false;
    }
    return this._font.lineHeight(this._fontSize, includeGap);
  },
  registerFont(name, src, family) {
    this._registeredFonts[name] = {
      src,
      family
    };
    return this;
  }
};

const SOFT_HYPHEN = '\u00AD';
const HYPHEN = '-';
class LineWrapper extends events.EventEmitter {
  constructor(document, options) {
    super();
    this.document = document;
    this.indent = options.indent || 0;
    this.characterSpacing = options.characterSpacing || 0;
    this.wordSpacing = options.wordSpacing === 0;
    this.columns = options.columns || 1;
    this.columnGap = options.columnGap != null ? options.columnGap : 18; // 1/4 inch
    this.lineWidth = (options.width - this.columnGap * (this.columns - 1)) / this.columns;
    this.spaceLeft = this.lineWidth;
    this.startX = this.document.x;
    this.startY = this.document.y;
    this.column = 1;
    this.ellipsis = options.ellipsis;
    this.continuedX = 0;
    this.features = options.features;

    // calculate the maximum Y position the text can appear at
    if (options.height != null) {
      this.height = options.height;
      this.maxY = this.startY + options.height;
    } else {
      this.maxY = this.document.page.maxY();
    }

    // handle paragraph indents
    this.on('firstLine', options => {
      // if this is the first line of the text segment, and
      // we're continuing where we left off, indent that much
      // otherwise use the user specified indent option
      const indent = this.continuedX || this.indent;
      this.document.x += indent;
      this.lineWidth -= indent;
      return this.once('line', () => {
        this.document.x -= indent;
        this.lineWidth += indent;
        if (options.continued && !this.continuedX) {
          this.continuedX = this.indent;
        }
        if (!options.continued) {
          return this.continuedX = 0;
        }
      });
    });

    // handle left aligning last lines of paragraphs
    this.on('lastLine', options => {
      const {
        align
      } = options;
      if (align === 'justify') {
        options.align = 'left';
      }
      this.lastLine = true;
      return this.once('line', () => {
        this.document.y += options.paragraphGap || 0;
        options.align = align;
        return this.lastLine = false;
      });
    });
  }
  wordWidth(word) {
    return this.document.widthOfString(word, this) + this.characterSpacing + this.wordSpacing;
  }
  canFit(word, w) {
    if (word[word.length - 1] != SOFT_HYPHEN) {
      return w <= this.spaceLeft;
    }
    return w + this.wordWidth(HYPHEN) <= this.spaceLeft;
  }
  eachWord(text, fn) {
    // setup a unicode line breaker
    let bk;
    const breaker = new LineBreaker(text);
    let last = null;
    const wordWidths = Object.create(null);
    while (bk = breaker.nextBreak()) {
      var shouldContinue;
      let word = text.slice((last != null ? last.position : undefined) || 0, bk.position);
      let w = wordWidths[word] != null ? wordWidths[word] : wordWidths[word] = this.wordWidth(word);

      // if the word is longer than the whole line, chop it up
      // TODO: break by grapheme clusters, not JS string characters
      if (w > this.lineWidth + this.continuedX) {
        // make some fake break objects
        let lbk = last;
        const fbk = {};
        while (word.length) {
          // fit as much of the word as possible into the space we have
          var l, mightGrow;
          if (w > this.spaceLeft) {
            // start our check at the end of our available space - this method is faster than a loop of each character and it resolves
            // an issue with long loops when processing massive words, such as a huge number of spaces
            l = Math.ceil(this.spaceLeft / (w / word.length));
            w = this.wordWidth(word.slice(0, l));
            mightGrow = w <= this.spaceLeft && l < word.length;
          } else {
            l = word.length;
          }
          let mustShrink = w > this.spaceLeft && l > 0;
          // shrink or grow word as necessary after our near-guess above
          while (mustShrink || mightGrow) {
            if (mustShrink) {
              w = this.wordWidth(word.slice(0, --l));
              mustShrink = w > this.spaceLeft && l > 0;
            } else {
              w = this.wordWidth(word.slice(0, ++l));
              mustShrink = w > this.spaceLeft && l > 0;
              mightGrow = w <= this.spaceLeft && l < word.length;
            }
          }

          // check for the edge case where a single character cannot fit into a line.
          if (l === 0 && this.spaceLeft === this.lineWidth) {
            l = 1;
          }

          // send a required break unless this is the last piece and a linebreak is not specified
          fbk.required = bk.required || l < word.length;
          shouldContinue = fn(word.slice(0, l), w, fbk, lbk);
          lbk = {
            required: false
          };

          // get the remaining piece of the word
          word = word.slice(l);
          w = this.wordWidth(word);
          if (shouldContinue === false) {
            break;
          }
        }
      } else {
        // otherwise just emit the break as it was given to us
        shouldContinue = fn(word, w, bk, last);
      }
      if (shouldContinue === false) {
        break;
      }
      last = bk;
    }
  }
  wrap(text, options) {
    // override options from previous continued fragments
    if (options.indent != null) {
      this.indent = options.indent;
    }
    if (options.characterSpacing != null) {
      this.characterSpacing = options.characterSpacing;
    }
    if (options.wordSpacing != null) {
      this.wordSpacing = options.wordSpacing;
    }
    if (options.ellipsis != null) {
      this.ellipsis = options.ellipsis;
    }

    // make sure we're actually on the page
    // and that the first line of is never by
    // itself at the bottom of a page (orphans)
    const nextY = this.document.y + this.document.currentLineHeight(true);
    if (this.document.y > this.maxY || nextY > this.maxY) {
      this.nextSection();
    }
    let buffer = '';
    let textWidth = 0;
    let wc = 0;
    let lc = 0;
    let {
      y
    } = this.document; // used to reset Y pos if options.continued (below)
    const emitLine = () => {
      options.textWidth = textWidth + this.wordSpacing * (wc - 1);
      options.wordCount = wc;
      options.lineWidth = this.lineWidth;
      ({
        y
      } = this.document);
      this.emit('line', buffer, options, this);
      return lc++;
    };
    this.emit('sectionStart', options, this);
    this.eachWord(text, (word, w, bk, last) => {
      if (last == null || last.required) {
        this.emit('firstLine', options, this);
        this.spaceLeft = this.lineWidth;
      }
      if (this.canFit(word, w)) {
        buffer += word;
        textWidth += w;
        wc++;
      }
      if (bk.required || !this.canFit(word, w)) {
        // if the user specified a max height and an ellipsis, and is about to pass the
        // max height and max columns after the next line, append the ellipsis
        const lh = this.document.currentLineHeight(true);
        if (this.height != null && this.ellipsis && this.document.y + lh * 2 > this.maxY && this.column >= this.columns) {
          if (this.ellipsis === true) {
            this.ellipsis = '…';
          } // map default ellipsis character
          buffer = buffer.replace(/\s+$/, '');
          textWidth = this.wordWidth(buffer + this.ellipsis);

          // remove characters from the buffer until the ellipsis fits
          // to avoid infinite loop need to stop while-loop if buffer is empty string
          while (buffer && textWidth > this.lineWidth) {
            buffer = buffer.slice(0, -1).replace(/\s+$/, '');
            textWidth = this.wordWidth(buffer + this.ellipsis);
          }
          // need to add ellipsis only if there is enough space for it
          if (textWidth <= this.lineWidth) {
            buffer = buffer + this.ellipsis;
          }
          textWidth = this.wordWidth(buffer);
        }
        if (bk.required) {
          if (w > this.spaceLeft) {
            emitLine();
            buffer = word;
            textWidth = w;
            wc = 1;
          }
          this.emit('lastLine', options, this);
        }

        // Previous entry is a soft hyphen - add visible hyphen.
        if (buffer[buffer.length - 1] == SOFT_HYPHEN) {
          buffer = buffer.slice(0, -1) + HYPHEN;
          this.spaceLeft -= this.wordWidth(HYPHEN);
        }
        emitLine();

        // if we've reached the edge of the page,
        // continue on a new page or column
        if (this.document.y + lh > this.maxY) {
          const shouldContinue = this.nextSection();

          // stop if we reached the maximum height
          if (!shouldContinue) {
            wc = 0;
            buffer = '';
            return false;
          }
        }

        // reset the space left and buffer
        if (bk.required) {
          this.spaceLeft = this.lineWidth;
          buffer = '';
          textWidth = 0;
          return wc = 0;
        } else {
          // reset the space left and buffer
          this.spaceLeft = this.lineWidth - w;
          buffer = word;
          textWidth = w;
          return wc = 1;
        }
      } else {
        return this.spaceLeft -= w;
      }
    });
    if (wc > 0) {
      this.emit('lastLine', options, this);
      emitLine();
    }
    this.emit('sectionEnd', options, this);

    // if the wrap is set to be continued, save the X position
    // to start the first line of the next segment at, and reset
    // the y position
    if (options.continued === true) {
      if (lc > 1) {
        this.continuedX = 0;
      }
      this.continuedX += options.textWidth || 0;
      return this.document.y = y;
    } else {
      return this.document.x = this.startX;
    }
  }
  nextSection(options) {
    this.emit('sectionEnd', options, this);
    if (++this.column > this.columns) {
      // if a max height was specified by the user, we're done.
      // otherwise, the default is to make a new page at the bottom.
      if (this.height != null) {
        return false;
      }
      this.document.continueOnNewPage();
      this.column = 1;
      this.startY = this.document.page.margins.top;
      this.maxY = this.document.page.maxY();
      this.document.x = this.startX;
      if (this.document._fillColor) {
        this.document.fillColor(...this.document._fillColor);
      }
      this.emit('pageBreak', options, this);
    } else {
      this.document.x += this.lineWidth + this.columnGap;
      this.document.y = this.startY;
      this.emit('columnBreak', options, this);
    }
    this.emit('sectionStart', options, this);
    return true;
  }
}

const {
  number: number$2
} = PDFObject;
var TextMixin = {
  initText() {
    this._line = this._line.bind(this);
    // Current coordinates
    this.x = 0;
    this.y = 0;
    return this._lineGap = 0;
  },
  lineGap(_lineGap) {
    this._lineGap = _lineGap;
    return this;
  },
  moveDown(lines) {
    if (lines == null) {
      lines = 1;
    }
    this.y += this.currentLineHeight(true) * lines + this._lineGap;
    return this;
  },
  moveUp(lines) {
    if (lines == null) {
      lines = 1;
    }
    this.y -= this.currentLineHeight(true) * lines + this._lineGap;
    return this;
  },
  _text(text, x, y, options, lineCallback) {
    options = this._initOptions(x, y, options);

    // Convert text to a string
    text = text == null ? '' : `${text}`;

    // if the wordSpacing option is specified, remove multiple consecutive spaces
    if (options.wordSpacing) {
      text = text.replace(/\s{2,}/g, ' ');
    }
    const addStructure = () => {
      if (options.structParent) {
        options.structParent.add(this.struct(options.structType || 'P', [this.markStructureContent(options.structType || 'P')]));
      }
    };

    // word wrapping
    if (options.width) {
      let wrapper = this._wrapper;
      if (!wrapper) {
        wrapper = new LineWrapper(this, options);
        wrapper.on('line', lineCallback);
        wrapper.on('firstLine', addStructure);
      }
      this._wrapper = options.continued ? wrapper : null;
      this._textOptions = options.continued ? options : null;
      wrapper.wrap(text, options);

      // render paragraphs as single lines
    } else {
      for (let line of text.split('\n')) {
        addStructure();
        lineCallback(line, options);
      }
    }
    return this;
  },
  text(text, x, y, options) {
    return this._text(text, x, y, options, this._line);
  },
  widthOfString(string, options = {}) {
    return this._font.widthOfString(string, this._fontSize, options.features) + (options.characterSpacing || 0) * (string.length - 1);
  },
  heightOfString(text, options) {
    const {
      x,
      y
    } = this;
    options = this._initOptions(options);
    options.height = Infinity; // don't break pages

    const lineGap = options.lineGap || this._lineGap || 0;
    this._text(text, this.x, this.y, options, () => {
      return this.y += this.currentLineHeight(true) + lineGap;
    });
    const height = this.y - y;
    this.x = x;
    this.y = y;
    return height;
  },
  list(list, x, y, options, wrapper) {
    options = this._initOptions(x, y, options);
    const listType = options.listType || 'bullet';
    const unit = Math.round(this._font.ascender / 1000 * this._fontSize);
    const midLine = unit / 2;
    const r = options.bulletRadius || unit / 3;
    const indent = options.textIndent || (listType === 'bullet' ? r * 5 : unit * 2);
    const itemIndent = options.bulletIndent || (listType === 'bullet' ? r * 8 : unit * 2);
    let level = 1;
    const items = [];
    const levels = [];
    const numbers = [];
    var flatten = function (list) {
      let n = 1;
      for (let i = 0; i < list.length; i++) {
        const item = list[i];
        if (Array.isArray(item)) {
          level++;
          flatten(item);
          level--;
        } else {
          items.push(item);
          levels.push(level);
          if (listType !== 'bullet') {
            numbers.push(n++);
          }
        }
      }
    };
    flatten(list);
    const label = function (n) {
      switch (listType) {
        case 'numbered':
          return `${n}.`;
        case 'lettered':
          var letter = String.fromCharCode((n - 1) % 26 + 65);
          var times = Math.floor((n - 1) / 26 + 1);
          var text = Array(times + 1).join(letter);
          return `${text}.`;
      }
    };
    const drawListItem = function (listItem, i) {
      wrapper = new LineWrapper(this, options);
      wrapper.on('line', this._line);
      level = 1;
      wrapper.once('firstLine', () => {
        let item, itemType, labelType, bodyType;
        if (options.structParent) {
          if (options.structTypes) {
            [itemType, labelType, bodyType] = options.structTypes;
          } else {
            [itemType, labelType, bodyType] = ['LI', 'Lbl', 'LBody'];
          }
        }
        if (itemType) {
          item = this.struct(itemType);
          options.structParent.add(item);
        } else if (options.structParent) {
          item = options.structParent;
        }
        let l;
        if ((l = levels[i++]) !== level) {
          const diff = itemIndent * (l - level);
          this.x += diff;
          wrapper.lineWidth -= diff;
          level = l;
        }
        if (item && (labelType || bodyType)) {
          item.add(this.struct(labelType || bodyType, [this.markStructureContent(labelType || bodyType)]));
        }
        switch (listType) {
          case 'bullet':
            this.circle(this.x - indent + r, this.y + midLine, r);
            this.fill();
            break;
          case 'numbered':
          case 'lettered':
            var text = label(numbers[i - 1]);
            this._fragment(text, this.x - indent, this.y, options);
            break;
        }
        if (item && labelType && bodyType) {
          item.add(this.struct(bodyType, [this.markStructureContent(bodyType)]));
        }
        if (item && item !== options.structParent) {
          item.end();
        }
      });
      wrapper.on('sectionStart', () => {
        const pos = indent + itemIndent * (level - 1);
        this.x += pos;
        return wrapper.lineWidth -= pos;
      });
      wrapper.on('sectionEnd', () => {
        const pos = indent + itemIndent * (level - 1);
        this.x -= pos;
        return wrapper.lineWidth += pos;
      });
      wrapper.wrap(listItem, options);
    };
    for (let i = 0; i < items.length; i++) {
      drawListItem.call(this, items[i], i);
    }
    return this;
  },
  _initOptions(x = {}, y, options = {}) {
    if (typeof x === 'object') {
      options = x;
      x = null;
    }

    // clone options object
    const result = Object.assign({}, options);

    // extend options with previous values for continued text
    if (this._textOptions) {
      for (let key in this._textOptions) {
        const val = this._textOptions[key];
        if (key !== 'continued') {
          if (result[key] === undefined) {
            result[key] = val;
          }
        }
      }
    }

    // Update the current position
    if (x != null) {
      this.x = x;
    }
    if (y != null) {
      this.y = y;
    }

    // wrap to margins if no x or y position passed
    if (result.lineBreak !== false) {
      if (result.width == null) {
        result.width = this.page.width - this.x - this.page.margins.right;
      }
      result.width = Math.max(result.width, 0);
    }
    if (!result.columns) {
      result.columns = 0;
    }
    if (result.columnGap == null) {
      result.columnGap = 18;
    } // 1/4 inch

    return result;
  },
  _line(text, options = {}, wrapper) {
    this._fragment(text, this.x, this.y, options);
    const lineGap = options.lineGap || this._lineGap || 0;
    if (!wrapper) {
      return this.x += this.widthOfString(text);
    } else {
      return this.y += this.currentLineHeight(true) + lineGap;
    }
  },
  _fragment(text, x, y, options) {
    let dy, encoded, i, positions, textWidth, words;
    text = `${text}`.replace(/\n/g, '');
    if (text.length === 0) {
      return;
    }

    // handle options
    const align = options.align || 'left';
    let wordSpacing = options.wordSpacing || 0;
    const characterSpacing = options.characterSpacing || 0;

    // text alignments
    if (options.width) {
      switch (align) {
        case 'right':
          textWidth = this.widthOfString(text.replace(/\s+$/, ''), options);
          x += options.lineWidth - textWidth;
          break;
        case 'center':
          x += options.lineWidth / 2 - options.textWidth / 2;
          break;
        case 'justify':
          // calculate the word spacing value
          words = text.trim().split(/\s+/);
          textWidth = this.widthOfString(text.replace(/\s+/g, ''), options);
          var spaceWidth = this.widthOfString(' ') + characterSpacing;
          wordSpacing = Math.max(0, (options.lineWidth - textWidth) / Math.max(1, words.length - 1) - spaceWidth);
          break;
      }
    }

    // text baseline alignments based on http://wiki.apache.org/xmlgraphics-fop/LineLayout/AlignmentHandling
    if (typeof options.baseline === 'number') {
      dy = -options.baseline;
    } else {
      switch (options.baseline) {
        case 'svg-middle':
          dy = 0.5 * this._font.xHeight;
          break;
        case 'middle':
        case 'svg-central':
          dy = 0.5 * (this._font.descender + this._font.ascender);
          break;
        case 'bottom':
        case 'ideographic':
          dy = this._font.descender;
          break;
        case 'alphabetic':
          dy = 0;
          break;
        case 'mathematical':
          dy = 0.5 * this._font.ascender;
          break;
        case 'hanging':
          dy = 0.8 * this._font.ascender;
          break;
        case 'top':
          dy = this._font.ascender;
          break;
        default:
          dy = this._font.ascender;
      }
      dy = dy / 1000 * this._fontSize;
    }

    // calculate the actual rendered width of the string after word and character spacing
    const renderedWidth = options.textWidth + wordSpacing * (options.wordCount - 1) + characterSpacing * (text.length - 1);

    // create link annotations if the link option is given
    if (options.link != null) {
      this.link(x, y, renderedWidth, this.currentLineHeight(), options.link);
    }
    if (options.goTo != null) {
      this.goTo(x, y, renderedWidth, this.currentLineHeight(), options.goTo);
    }
    if (options.destination != null) {
      this.addNamedDestination(options.destination, 'XYZ', x, y, null);
    }

    // create underline
    if (options.underline) {
      this.save();
      if (!options.stroke) {
        this.strokeColor(...(this._fillColor || []));
      }
      const lineWidth = this._fontSize < 10 ? 0.5 : Math.floor(this._fontSize / 10);
      this.lineWidth(lineWidth);
      let lineY = y + this.currentLineHeight() - lineWidth;
      this.moveTo(x, lineY);
      this.lineTo(x + renderedWidth, lineY);
      this.stroke();
      this.restore();
    }

    // create strikethrough line
    if (options.strike) {
      this.save();
      if (!options.stroke) {
        this.strokeColor(...(this._fillColor || []));
      }
      const lineWidth = this._fontSize < 10 ? 0.5 : Math.floor(this._fontSize / 10);
      this.lineWidth(lineWidth);
      let lineY = y + this.currentLineHeight() / 2;
      this.moveTo(x, lineY);
      this.lineTo(x + renderedWidth, lineY);
      this.stroke();
      this.restore();
    }
    this.save();

    // oblique (angle in degrees or boolean)
    if (options.oblique) {
      let skew;
      if (typeof options.oblique === 'number') {
        skew = -Math.tan(options.oblique * Math.PI / 180);
      } else {
        skew = -0.25;
      }
      this.transform(1, 0, 0, 1, x, y);
      this.transform(1, 0, skew, 1, -skew * dy, 0);
      this.transform(1, 0, 0, 1, -x, -y);
    }

    // flip coordinate system
    this.transform(1, 0, 0, -1, 0, this.page.height);
    y = this.page.height - y - dy;

    // add current font to page if necessary
    if (this.page.fonts[this._font.id] == null) {
      this.page.fonts[this._font.id] = this._font.ref();
    }

    // begin the text object
    this.addContent('BT');

    // text position
    this.addContent(`1 0 0 1 ${number$2(x)} ${number$2(y)} Tm`);

    // font and font size
    this.addContent(`/${this._font.id} ${number$2(this._fontSize)} Tf`);

    // rendering mode
    const mode = options.fill && options.stroke ? 2 : options.stroke ? 1 : 0;
    if (mode) {
      this.addContent(`${mode} Tr`);
    }

    // Character spacing
    if (characterSpacing) {
      this.addContent(`${number$2(characterSpacing)} Tc`);
    }

    // Add the actual text
    // If we have a word spacing value, we need to encode each word separately
    // since the normal Tw operator only works on character code 32, which isn't
    // used for embedded fonts.
    if (wordSpacing) {
      words = text.trim().split(/\s+/);
      wordSpacing += this.widthOfString(' ') + characterSpacing;
      wordSpacing *= 1000 / this._fontSize;
      encoded = [];
      positions = [];
      for (let word of words) {
        const [encodedWord, positionsWord] = this._font.encode(word, options.features);
        encoded = encoded.concat(encodedWord);
        positions = positions.concat(positionsWord);

        // add the word spacing to the end of the word
        // clone object because of cache
        const space = {};
        const object = positions[positions.length - 1];
        for (let key in object) {
          const val = object[key];
          space[key] = val;
        }
        space.xAdvance += wordSpacing;
        positions[positions.length - 1] = space;
      }
    } else {
      [encoded, positions] = this._font.encode(text, options.features);
    }
    const scale = this._fontSize / 1000;
    const commands = [];
    let last = 0;
    let hadOffset = false;

    // Adds a segment of text to the TJ command buffer
    const addSegment = cur => {
      if (last < cur) {
        const hex = encoded.slice(last, cur).join('');
        const advance = positions[cur - 1].xAdvance - positions[cur - 1].advanceWidth;
        commands.push(`<${hex}> ${number$2(-advance)}`);
      }
      return last = cur;
    };

    // Flushes the current TJ commands to the output stream
    const flush = i => {
      addSegment(i);
      if (commands.length > 0) {
        this.addContent(`[${commands.join(' ')}] TJ`);
        return commands.length = 0;
      }
    };
    for (i = 0; i < positions.length; i++) {
      // If we have an x or y offset, we have to break out of the current TJ command
      // so we can move the text position.
      const pos = positions[i];
      if (pos.xOffset || pos.yOffset) {
        // Flush the current buffer
        flush(i);

        // Move the text position and flush just the current character
        this.addContent(`1 0 0 1 ${number$2(x + pos.xOffset * scale)} ${number$2(y + pos.yOffset * scale)} Tm`);
        flush(i + 1);
        hadOffset = true;
      } else {
        // If the last character had an offset, reset the text position
        if (hadOffset) {
          this.addContent(`1 0 0 1 ${number$2(x)} ${number$2(y)} Tm`);
          hadOffset = false;
        }

        // Group segments that don't have any advance adjustments
        if (pos.xAdvance - pos.advanceWidth !== 0) {
          addSegment(i + 1);
        }
      }
      x += pos.xAdvance * scale;
    }

    // Flush any remaining commands
    flush(i);

    // end the text object
    this.addContent('ET');

    // restore flipped coordinate system
    return this.restore();
  }
};

const MARKERS = [0xffc0, 0xffc1, 0xffc2, 0xffc3, 0xffc5, 0xffc6, 0xffc7, 0xffc8, 0xffc9, 0xffca, 0xffcb, 0xffcc, 0xffcd, 0xffce, 0xffcf];
const COLOR_SPACE_MAP = {
  1: 'DeviceGray',
  3: 'DeviceRGB',
  4: 'DeviceCMYK'
};
class JPEG {
  constructor(data, label) {
    let marker;
    this.data = data;
    this.label = label;
    if (this.data.readUInt16BE(0) !== 0xffd8) {
      throw 'SOI not found in JPEG';
    }

    // Parse the EXIF orientation
    this.orientation = exif.fromBuffer(this.data).Orientation || 1;
    let pos = 2;
    while (pos < this.data.length) {
      marker = this.data.readUInt16BE(pos);
      pos += 2;
      if (MARKERS.includes(marker)) {
        break;
      }
      pos += this.data.readUInt16BE(pos);
    }
    if (!MARKERS.includes(marker)) {
      throw 'Invalid JPEG.';
    }
    pos += 2;
    this.bits = this.data[pos++];
    this.height = this.data.readUInt16BE(pos);
    pos += 2;
    this.width = this.data.readUInt16BE(pos);
    pos += 2;
    const channels = this.data[pos++];
    this.colorSpace = COLOR_SPACE_MAP[channels];
    this.obj = null;
  }
  embed(document) {
    if (this.obj) {
      return;
    }
    this.obj = document.ref({
      Type: 'XObject',
      Subtype: 'Image',
      BitsPerComponent: this.bits,
      Width: this.width,
      Height: this.height,
      ColorSpace: this.colorSpace,
      Filter: 'DCTDecode'
    });

    // add extra decode params for CMYK images. By swapping the
    // min and max values from the default, we invert the colors. See
    // section 4.8.4 of the spec.
    if (this.colorSpace === 'DeviceCMYK') {
      this.obj.data['Decode'] = [1.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 0.0];
    }
    this.obj.end(this.data);

    // free memory
    return this.data = null;
  }
}

class PNGImage {
  constructor(data, label) {
    this.label = label;
    this.image = new PNG(data);
    this.width = this.image.width;
    this.height = this.image.height;
    this.imgData = this.image.imgData;
    this.obj = null;
  }
  embed(document) {
    let dataDecoded = false;
    this.document = document;
    if (this.obj) {
      return;
    }
    const hasAlphaChannel = this.image.hasAlphaChannel;
    const isInterlaced = this.image.interlaceMethod === 1;
    this.obj = this.document.ref({
      Type: 'XObject',
      Subtype: 'Image',
      BitsPerComponent: hasAlphaChannel ? 8 : this.image.bits,
      Width: this.width,
      Height: this.height,
      Filter: 'FlateDecode'
    });
    if (!hasAlphaChannel) {
      const params = this.document.ref({
        Predictor: isInterlaced ? 1 : 15,
        Colors: this.image.colors,
        BitsPerComponent: this.image.bits,
        Columns: this.width
      });
      this.obj.data['DecodeParms'] = params;
      params.end();
    }
    if (this.image.palette.length === 0) {
      this.obj.data['ColorSpace'] = this.image.colorSpace;
    } else {
      // embed the color palette in the PDF as an object stream
      const palette = this.document.ref();
      palette.end(Buffer.from(this.image.palette));

      // build the color space array for the image
      this.obj.data['ColorSpace'] = ['Indexed', 'DeviceRGB', this.image.palette.length / 3 - 1, palette];
    }

    // For PNG color types 0, 2 and 3, the transparency data is stored in
    // a dedicated PNG chunk.
    if (this.image.transparency.grayscale != null) {
      // Use Color Key Masking (spec section 4.8.5)
      // An array with N elements, where N is two times the number of color components.
      const val = this.image.transparency.grayscale;
      this.obj.data['Mask'] = [val, val];
    } else if (this.image.transparency.rgb) {
      // Use Color Key Masking (spec section 4.8.5)
      // An array with N elements, where N is two times the number of color components.
      const {
        rgb
      } = this.image.transparency;
      const mask = [];
      for (let x of rgb) {
        mask.push(x, x);
      }
      this.obj.data['Mask'] = mask;
    } else if (this.image.transparency.indexed) {
      // Create a transparency SMask for the image based on the data
      // in the PLTE and tRNS sections. See below for details on SMasks.
      dataDecoded = true;
      return this.loadIndexedAlphaChannel();
    } else if (hasAlphaChannel) {
      // For PNG color types 4 and 6, the transparency data is stored as a alpha
      // channel mixed in with the main image data. Separate this data out into an
      // SMask object and store it separately in the PDF.
      dataDecoded = true;
      return this.splitAlphaChannel();
    }
    if (isInterlaced && !dataDecoded) {
      return this.decodeData();
    }
    this.finalize();
  }
  finalize() {
    if (this.alphaChannel) {
      const sMask = this.document.ref({
        Type: 'XObject',
        Subtype: 'Image',
        Height: this.height,
        Width: this.width,
        BitsPerComponent: 8,
        Filter: 'FlateDecode',
        ColorSpace: 'DeviceGray',
        Decode: [0, 1]
      });
      sMask.end(this.alphaChannel);
      this.obj.data['SMask'] = sMask;
    }

    // add the actual image data
    this.obj.end(this.imgData);

    // free memory
    this.image = null;
    return this.imgData = null;
  }
  splitAlphaChannel() {
    return this.image.decodePixels(pixels => {
      let a, p;
      const colorCount = this.image.colors;
      const pixelCount = this.width * this.height;
      const imgData = Buffer.alloc(pixelCount * colorCount);
      const alphaChannel = Buffer.alloc(pixelCount);
      let i = p = a = 0;
      const len = pixels.length;
      // For 16bit images copy only most significant byte (MSB) - PNG data is always stored in network byte order (MSB first)
      const skipByteCount = this.image.bits === 16 ? 1 : 0;
      while (i < len) {
        for (let colorIndex = 0; colorIndex < colorCount; colorIndex++) {
          imgData[p++] = pixels[i++];
          i += skipByteCount;
        }
        alphaChannel[a++] = pixels[i++];
        i += skipByteCount;
      }
      this.imgData = zlib.deflateSync(imgData);
      this.alphaChannel = zlib.deflateSync(alphaChannel);
      return this.finalize();
    });
  }
  loadIndexedAlphaChannel() {
    const transparency = this.image.transparency.indexed;
    return this.image.decodePixels(pixels => {
      const alphaChannel = Buffer.alloc(this.width * this.height);
      let i = 0;
      for (let j = 0, end = pixels.length; j < end; j++) {
        alphaChannel[i++] = transparency[pixels[j]];
      }
      this.alphaChannel = zlib.deflateSync(alphaChannel);
      return this.finalize();
    });
  }
  decodeData() {
    this.image.decodePixels(pixels => {
      this.imgData = zlib.deflateSync(pixels);
      this.finalize();
    });
  }
}

/*
PDFImage - embeds images in PDF documents
By Devon Govett
*/
class PDFImage {
  static open(src, label) {
    let data;
    if (Buffer.isBuffer(src)) {
      data = src;
    } else if (src instanceof ArrayBuffer) {
      data = Buffer.from(new Uint8Array(src));
    } else {
      let match;
      if (match = /^data:.+?;base64,(.*)$/.exec(src)) {
        data = Buffer.from(match[1], 'base64');
      } else {
        data = fs.readFileSync(src);
        if (!data) {
          return;
        }
      }
    }
    if (data[0] === 0xff && data[1] === 0xd8) {
      return new JPEG(data, label);
    } else if (data[0] === 0x89 && data.toString('ascii', 1, 4) === 'PNG') {
      return new PNGImage(data, label);
    } else {
      throw new Error('Unknown image format.');
    }
  }
}

var ImagesMixin = {
  initImages() {
    this._imageRegistry = {};
    return this._imageCount = 0;
  },
  image(src, x, y, options = {}) {
    let bh, bp, bw, image, ip, left, left1, rotateAngle, originX, originY;
    if (typeof x === 'object') {
      options = x;
      x = null;
    }

    // Ignore orientation based on document options or image options
    const ignoreOrientation = options.ignoreOrientation || options.ignoreOrientation !== false && this.options.ignoreOrientation;
    x = (left = x != null ? x : options.x) != null ? left : this.x;
    y = (left1 = y != null ? y : options.y) != null ? left1 : this.y;
    if (typeof src === 'string') {
      image = this._imageRegistry[src];
    }
    if (!image) {
      if (src.width && src.height) {
        image = src;
      } else {
        image = this.openImage(src);
      }
    }
    if (!image.obj) {
      image.embed(this);
    }
    if (this.page.xobjects[image.label] == null) {
      this.page.xobjects[image.label] = image.obj;
    }
    let {
      width,
      height
    } = image;

    // If EXIF orientation calls for it, swap width and height
    if (!ignoreOrientation && image.orientation > 4) {
      [width, height] = [height, width];
    }
    let w = options.width || width;
    let h = options.height || height;
    if (options.width && !options.height) {
      const wp = w / width;
      w = width * wp;
      h = height * wp;
    } else if (options.height && !options.width) {
      const hp = h / height;
      w = width * hp;
      h = height * hp;
    } else if (options.scale) {
      w = width * options.scale;
      h = height * options.scale;
    } else if (options.fit) {
      [bw, bh] = options.fit;
      bp = bw / bh;
      ip = width / height;
      if (ip > bp) {
        w = bw;
        h = bw / ip;
      } else {
        h = bh;
        w = bh * ip;
      }
    } else if (options.cover) {
      [bw, bh] = options.cover;
      bp = bw / bh;
      ip = width / height;
      if (ip > bp) {
        h = bh;
        w = bh * ip;
      } else {
        w = bw;
        h = bw / ip;
      }
    }
    if (options.fit || options.cover) {
      if (options.align === 'center') {
        x = x + bw / 2 - w / 2;
      } else if (options.align === 'right') {
        x = x + bw - w;
      }
      if (options.valign === 'center') {
        y = y + bh / 2 - h / 2;
      } else if (options.valign === 'bottom') {
        y = y + bh - h;
      }
    }
    if (!ignoreOrientation) {
      switch (image.orientation) {
        // No orientation (need to flip image, though, because of the default transform matrix on the document)
        default:
        case 1:
          h = -h;
          y -= h;
          rotateAngle = 0;
          break;
        // Flip Horizontal
        case 2:
          w = -w;
          h = -h;
          x -= w;
          y -= h;
          rotateAngle = 0;
          break;
        // Rotate 180 degrees
        case 3:
          originX = x;
          originY = y;
          h = -h;
          x -= w;
          rotateAngle = 180;
          break;
        // Flip vertical
        case 4:
          // Do nothing, image will be flipped

          break;
        // Flip horizontally and rotate 270 degrees CW
        case 5:
          originX = x;
          originY = y;
          [w, h] = [h, w];
          y -= h;
          rotateAngle = 90;
          break;
        // Rotate 90 degrees CW
        case 6:
          originX = x;
          originY = y;
          [w, h] = [h, w];
          h = -h;
          rotateAngle = 90;
          break;
        // Flip horizontally and rotate 90 degrees CW
        case 7:
          originX = x;
          originY = y;
          [w, h] = [h, w];
          h = -h;
          w = -w;
          x -= w;
          rotateAngle = 90;
          break;
        // Rotate 270 degrees CW
        case 8:
          originX = x;
          originY = y;
          [w, h] = [h, w];
          h = -h;
          x -= w;
          y -= h;
          rotateAngle = -90;
          break;
      }
    } else {
      h = -h;
      y -= h;
      rotateAngle = 0;
    }

    // create link annotations if the link option is given
    if (options.link != null) {
      this.link(x, y, w, h, options.link);
    }
    if (options.goTo != null) {
      this.goTo(x, y, w, h, options.goTo);
    }
    if (options.destination != null) {
      this.addNamedDestination(options.destination, 'XYZ', x, y, null);
    }

    // Set the current y position to below the image if it is in the document flow
    if (this.y === y) {
      this.y += h;
    }
    this.save();
    if (rotateAngle) {
      this.rotate(rotateAngle, {
        origin: [originX, originY]
      });
    }
    this.transform(w, 0, 0, h, x, y);
    this.addContent(`/${image.label} Do`);
    this.restore();
    return this;
  },
  openImage(src) {
    let image;
    if (typeof src === 'string') {
      image = this._imageRegistry[src];
    }
    if (!image) {
      image = PDFImage.open(src, `I${++this._imageCount}`);
      if (typeof src === 'string') {
        this._imageRegistry[src] = image;
      }
    }
    return image;
  }
};

var AnnotationsMixin = {
  annotate(x, y, w, h, options) {
    options.Type = 'Annot';
    options.Rect = this._convertRect(x, y, w, h);
    options.Border = [0, 0, 0];
    if (options.Subtype === 'Link' && typeof options.F === 'undefined') {
      options.F = 1 << 2; // Print Annotation Flag
    }
    if (options.Subtype !== 'Link') {
      if (options.C == null) {
        options.C = this._normalizeColor(options.color || [0, 0, 0]);
      }
    } // convert colors
    delete options.color;
    if (typeof options.Dest === 'string') {
      options.Dest = new String(options.Dest);
    }

    // Capitalize keys
    for (let key in options) {
      const val = options[key];
      options[key[0].toUpperCase() + key.slice(1)] = val;
    }
    const ref = this.ref(options);
    this.page.annotations.push(ref);
    ref.end();
    return this;
  },
  note(x, y, w, h, contents, options = {}) {
    options.Subtype = 'Text';
    options.Contents = new String(contents);
    options.Name = 'Comment';
    if (options.color == null) {
      options.color = [243, 223, 92];
    }
    return this.annotate(x, y, w, h, options);
  },
  goTo(x, y, w, h, name, options = {}) {
    options.Subtype = 'Link';
    options.A = this.ref({
      S: 'GoTo',
      D: new String(name)
    });
    options.A.end();
    return this.annotate(x, y, w, h, options);
  },
  link(x, y, w, h, url, options = {}) {
    options.Subtype = 'Link';
    if (typeof url === 'number') {
      // Link to a page in the document (the page must already exist)
      const pages = this._root.data.Pages.data;
      if (url >= 0 && url < pages.Kids.length) {
        options.A = this.ref({
          S: 'GoTo',
          D: [pages.Kids[url], 'XYZ', null, null, null]
        });
        options.A.end();
      } else {
        throw new Error(`The document has no page ${url}`);
      }
    } else {
      // Link to an external url
      options.A = this.ref({
        S: 'URI',
        URI: new String(url)
      });
      options.A.end();
    }
    return this.annotate(x, y, w, h, options);
  },
  _markup(x, y, w, h, options = {}) {
    const [x1, y1, x2, y2] = this._convertRect(x, y, w, h);
    options.QuadPoints = [x1, y2, x2, y2, x1, y1, x2, y1];
    options.Contents = new String();
    return this.annotate(x, y, w, h, options);
  },
  highlight(x, y, w, h, options = {}) {
    options.Subtype = 'Highlight';
    if (options.color == null) {
      options.color = [241, 238, 148];
    }
    return this._markup(x, y, w, h, options);
  },
  underline(x, y, w, h, options = {}) {
    options.Subtype = 'Underline';
    return this._markup(x, y, w, h, options);
  },
  strike(x, y, w, h, options = {}) {
    options.Subtype = 'StrikeOut';
    return this._markup(x, y, w, h, options);
  },
  lineAnnotation(x1, y1, x2, y2, options = {}) {
    options.Subtype = 'Line';
    options.Contents = new String();
    options.L = [x1, this.page.height - y1, x2, this.page.height - y2];
    return this.annotate(x1, y1, x2, y2, options);
  },
  rectAnnotation(x, y, w, h, options = {}) {
    options.Subtype = 'Square';
    options.Contents = new String();
    return this.annotate(x, y, w, h, options);
  },
  ellipseAnnotation(x, y, w, h, options = {}) {
    options.Subtype = 'Circle';
    options.Contents = new String();
    return this.annotate(x, y, w, h, options);
  },
  textAnnotation(x, y, w, h, text, options = {}) {
    options.Subtype = 'FreeText';
    options.Contents = new String(text);
    options.DA = new String();
    return this.annotate(x, y, w, h, options);
  },
  fileAnnotation(x, y, w, h, file = {}, options = {}) {
    // create hidden file
    const filespec = this.file(file.src, Object.assign({
      hidden: true
    }, file));
    options.Subtype = 'FileAttachment';
    options.FS = filespec;

    // add description from filespec unless description (Contents) has already been set
    if (options.Contents) {
      options.Contents = new String(options.Contents);
    } else if (filespec.data.Desc) {
      options.Contents = filespec.data.Desc;
    }
    return this.annotate(x, y, w, h, options);
  },
  _convertRect(x1, y1, w, h) {
    // flip y1 and y2
    let y2 = y1;
    y1 += h;

    // make x2
    let x2 = x1 + w;

    // apply current transformation matrix to points
    const [m0, m1, m2, m3, m4, m5] = this._ctm;
    x1 = m0 * x1 + m2 * y1 + m4;
    y1 = m1 * x1 + m3 * y1 + m5;
    x2 = m0 * x2 + m2 * y2 + m4;
    y2 = m1 * x2 + m3 * y2 + m5;
    return [x1, y1, x2, y2];
  }
};

class PDFOutline {
  constructor(document, parent, title, dest, options = {
    expanded: false
  }) {
    this.document = document;
    this.options = options;
    this.outlineData = {};
    if (dest !== null) {
      this.outlineData['Dest'] = [dest.dictionary, 'Fit'];
    }
    if (parent !== null) {
      this.outlineData['Parent'] = parent;
    }
    if (title !== null) {
      this.outlineData['Title'] = new String(title);
    }
    this.dictionary = this.document.ref(this.outlineData);
    this.children = [];
  }
  addItem(title, options = {
    expanded: false
  }) {
    const result = new PDFOutline(this.document, this.dictionary, title, this.document.page, options);
    this.children.push(result);
    return result;
  }
  endOutline() {
    if (this.children.length > 0) {
      if (this.options.expanded) {
        this.outlineData.Count = this.children.length;
      }
      const first = this.children[0],
        last = this.children[this.children.length - 1];
      this.outlineData.First = first.dictionary;
      this.outlineData.Last = last.dictionary;
      for (let i = 0, len = this.children.length; i < len; i++) {
        const child = this.children[i];
        if (i > 0) {
          child.outlineData.Prev = this.children[i - 1].dictionary;
        }
        if (i < this.children.length - 1) {
          child.outlineData.Next = this.children[i + 1].dictionary;
        }
        child.endOutline();
      }
    }
    return this.dictionary.end();
  }
}

var OutlineMixin = {
  initOutline() {
    return this.outline = new PDFOutline(this, null, null, null);
  },
  endOutline() {
    this.outline.endOutline();
    if (this.outline.children.length > 0) {
      this._root.data.Outlines = this.outline.dictionary;
      return this._root.data.PageMode = 'UseOutlines';
    }
  }
};

/*
PDFStructureContent - a reference to a marked structure content
By Ben Schmidt
*/

class PDFStructureContent {
  constructor(pageRef, mcid) {
    this.refs = [{
      pageRef,
      mcid
    }];
  }
  push(structContent) {
    structContent.refs.forEach(ref => this.refs.push(ref));
  }
}

/*
PDFStructureElement - represents an element in the PDF logical structure tree
By Ben Schmidt
*/
class PDFStructureElement {
  constructor(document, type, options = {}, children = null) {
    this.document = document;
    this._attached = false;
    this._ended = false;
    this._flushed = false;
    this.dictionary = document.ref({
      // Type: "StructElem",
      S: type
    });
    const data = this.dictionary.data;
    if (Array.isArray(options) || this._isValidChild(options)) {
      children = options;
      options = {};
    }
    if (typeof options.title !== 'undefined') {
      data.T = new String(options.title);
    }
    if (typeof options.lang !== 'undefined') {
      data.Lang = new String(options.lang);
    }
    if (typeof options.alt !== 'undefined') {
      data.Alt = new String(options.alt);
    }
    if (typeof options.expanded !== 'undefined') {
      data.E = new String(options.expanded);
    }
    if (typeof options.actual !== 'undefined') {
      data.ActualText = new String(options.actual);
    }
    this._children = [];
    if (children) {
      if (!Array.isArray(children)) {
        children = [children];
      }
      children.forEach(child => this.add(child));
      this.end();
    }
  }
  add(child) {
    if (this._ended) {
      throw new Error(`Cannot add child to already-ended structure element`);
    }
    if (!this._isValidChild(child)) {
      throw new Error(`Invalid structure element child`);
    }
    if (child instanceof PDFStructureElement) {
      child.setParent(this.dictionary);
      if (this._attached) {
        child.setAttached();
      }
    }
    if (child instanceof PDFStructureContent) {
      this._addContentToParentTree(child);
    }
    if (typeof child === 'function' && this._attached) {
      // _contentForClosure() adds the content to the parent tree
      child = this._contentForClosure(child);
    }
    this._children.push(child);
    return this;
  }
  _addContentToParentTree(content) {
    content.refs.forEach(({
      pageRef,
      mcid
    }) => {
      const pageStructParents = this.document.getStructParentTree().get(pageRef.data.StructParents);
      pageStructParents[mcid] = this.dictionary;
    });
  }
  setParent(parentRef) {
    if (this.dictionary.data.P) {
      throw new Error(`Structure element added to more than one parent`);
    }
    this.dictionary.data.P = parentRef;
    this._flush();
  }
  setAttached() {
    if (this._attached) {
      return;
    }
    this._children.forEach((child, index) => {
      if (child instanceof PDFStructureElement) {
        child.setAttached();
      }
      if (typeof child === 'function') {
        this._children[index] = this._contentForClosure(child);
      }
    });
    this._attached = true;
    this._flush();
  }
  end() {
    if (this._ended) {
      return;
    }
    this._children.filter(child => child instanceof PDFStructureElement).forEach(child => child.end());
    this._ended = true;
    this._flush();
  }
  _isValidChild(child) {
    return child instanceof PDFStructureElement || child instanceof PDFStructureContent || typeof child === 'function';
  }
  _contentForClosure(closure) {
    const content = this.document.markStructureContent(this.dictionary.data.S);
    closure();
    this.document.endMarkedContent();
    this._addContentToParentTree(content);
    return content;
  }
  _isFlushable() {
    if (!this.dictionary.data.P || !this._ended) {
      return false;
    }
    return this._children.every(child => {
      if (typeof child === 'function') {
        return false;
      }
      if (child instanceof PDFStructureElement) {
        return child._isFlushable();
      }
      return true;
    });
  }
  _flush() {
    if (this._flushed || !this._isFlushable()) {
      return;
    }
    this.dictionary.data.K = [];
    this._children.forEach(child => this._flushChild(child));
    this.dictionary.end();

    // free memory used by children; the dictionary itself may still be
    // referenced by a parent structure element or root, but we can
    // at least trim the tree here
    this._children = [];
    this.dictionary.data.K = null;
    this._flushed = true;
  }
  _flushChild(child) {
    if (child instanceof PDFStructureElement) {
      this.dictionary.data.K.push(child.dictionary);
    }
    if (child instanceof PDFStructureContent) {
      child.refs.forEach(({
        pageRef,
        mcid
      }) => {
        if (!this.dictionary.data.Pg) {
          this.dictionary.data.Pg = pageRef;
        }
        if (this.dictionary.data.Pg === pageRef) {
          this.dictionary.data.K.push(mcid);
        } else {
          this.dictionary.data.K.push({
            Type: "MCR",
            Pg: pageRef,
            MCID: mcid
          });
        }
      });
    }
  }
}

/*
PDFNumberTree - represents a number tree object
*/
class PDFNumberTree extends PDFTree {
  _compareKeys(a, b) {
    return parseInt(a) - parseInt(b);
  }
  _keysName() {
    return "Nums";
  }
  _dataForKey(k) {
    return parseInt(k);
  }
}

/*
Markings mixin - support marked content sequences in content streams
By Ben Schmidt
*/
var MarkingsMixin = {
  initMarkings(options) {
    this.structChildren = [];
    if (options.tagged) {
      this.getMarkInfoDictionary().data.Marked = true;
      this.getStructTreeRoot();
    }
  },
  markContent(tag, options = null) {
    if (tag === 'Artifact' || options && options.mcid) {
      let toClose = 0;
      this.page.markings.forEach(marking => {
        if (toClose || marking.structContent || marking.tag === 'Artifact') {
          toClose++;
        }
      });
      while (toClose--) {
        this.endMarkedContent();
      }
    }
    if (!options) {
      this.page.markings.push({
        tag
      });
      this.addContent(`/${tag} BMC`);
      return this;
    }
    this.page.markings.push({
      tag,
      options
    });
    const dictionary = {};
    if (typeof options.mcid !== 'undefined') {
      dictionary.MCID = options.mcid;
    }
    if (tag === 'Artifact') {
      if (typeof options.type === 'string') {
        dictionary.Type = options.type;
      }
      if (Array.isArray(options.bbox)) {
        dictionary.BBox = [options.bbox[0], this.page.height - options.bbox[3], options.bbox[2], this.page.height - options.bbox[1]];
      }
      if (Array.isArray(options.attached) && options.attached.every(val => typeof val === 'string')) {
        dictionary.Attached = options.attached;
      }
    }
    if (tag === 'Span') {
      if (options.lang) {
        dictionary.Lang = new String(options.lang);
      }
      if (options.alt) {
        dictionary.Alt = new String(options.alt);
      }
      if (options.expanded) {
        dictionary.E = new String(options.expanded);
      }
      if (options.actual) {
        dictionary.ActualText = new String(options.actual);
      }
    }
    this.addContent(`/${tag} ${PDFObject.convert(dictionary)} BDC`);
    return this;
  },
  markStructureContent(tag, options = {}) {
    const pageStructParents = this.getStructParentTree().get(this.page.structParentTreeKey);
    const mcid = pageStructParents.length;
    pageStructParents.push(null);
    this.markContent(tag, {
      ...options,
      mcid
    });
    const structContent = new PDFStructureContent(this.page.dictionary, mcid);
    this.page.markings.slice(-1)[0].structContent = structContent;
    return structContent;
  },
  endMarkedContent() {
    this.page.markings.pop();
    this.addContent('EMC');
    return this;
  },
  struct(type, options = {}, children = null) {
    return new PDFStructureElement(this, type, options, children);
  },
  addStructure(structElem) {
    const structTreeRoot = this.getStructTreeRoot();
    structElem.setParent(structTreeRoot);
    structElem.setAttached();
    this.structChildren.push(structElem);
    if (!structTreeRoot.data.K) {
      structTreeRoot.data.K = [];
    }
    structTreeRoot.data.K.push(structElem.dictionary);
    return this;
  },
  initPageMarkings(pageMarkings) {
    pageMarkings.forEach(marking => {
      if (marking.structContent) {
        const structContent = marking.structContent;
        const newStructContent = this.markStructureContent(marking.tag, marking.options);
        structContent.push(newStructContent);
        this.page.markings.slice(-1)[0].structContent = structContent;
      } else {
        this.markContent(marking.tag, marking.options);
      }
    });
  },
  endPageMarkings(page) {
    const pageMarkings = page.markings;
    pageMarkings.forEach(() => page.write('EMC'));
    page.markings = [];
    return pageMarkings;
  },
  getMarkInfoDictionary() {
    if (!this._root.data.MarkInfo) {
      this._root.data.MarkInfo = this.ref({});
    }
    return this._root.data.MarkInfo;
  },
  getStructTreeRoot() {
    if (!this._root.data.StructTreeRoot) {
      this._root.data.StructTreeRoot = this.ref({
        Type: 'StructTreeRoot',
        ParentTree: new PDFNumberTree(),
        ParentTreeNextKey: 0
      });
    }
    return this._root.data.StructTreeRoot;
  },
  getStructParentTree() {
    return this.getStructTreeRoot().data.ParentTree;
  },
  createStructParentTreeNextKey() {
    // initialise the MarkInfo dictionary
    this.getMarkInfoDictionary();
    const structTreeRoot = this.getStructTreeRoot();
    const key = structTreeRoot.data.ParentTreeNextKey++;
    structTreeRoot.data.ParentTree.add(key, []);
    return key;
  },
  endMarkings() {
    const structTreeRoot = this._root.data.StructTreeRoot;
    if (structTreeRoot) {
      structTreeRoot.end();
      this.structChildren.forEach(structElem => structElem.end());
    }
    if (this._root.data.MarkInfo) {
      this._root.data.MarkInfo.end();
    }
  }
};

const FIELD_FLAGS = {
  readOnly: 1,
  required: 2,
  noExport: 4,
  multiline: 0x1000,
  password: 0x2000,
  toggleToOffButton: 0x4000,
  radioButton: 0x8000,
  pushButton: 0x10000,
  combo: 0x20000,
  edit: 0x40000,
  sort: 0x80000,
  multiSelect: 0x200000,
  noSpell: 0x400000
};
const FIELD_JUSTIFY = {
  left: 0,
  center: 1,
  right: 2
};
const VALUE_MAP = {
  value: 'V',
  defaultValue: 'DV'
};
const FORMAT_SPECIAL = {
  zip: '0',
  zipPlus4: '1',
  zip4: '1',
  phone: '2',
  ssn: '3'
};
const FORMAT_DEFAULT = {
  number: {
    nDec: 0,
    sepComma: false,
    negStyle: 'MinusBlack',
    currency: '',
    currencyPrepend: true
  },
  percent: {
    nDec: 0,
    sepComma: false
  }
};
var AcroFormMixin = {
  /**
   * Must call if adding AcroForms to a document. Must also call font() before
   * this method to set the default font.
   */
  initForm() {
    if (!this._font) {
      throw new Error('Must set a font before calling initForm method');
    }
    this._acroform = {
      fonts: {},
      defaultFont: this._font.name
    };
    this._acroform.fonts[this._font.id] = this._font.ref();
    let data = {
      Fields: [],
      NeedAppearances: true,
      DA: new String(`/${this._font.id} 0 Tf 0 g`),
      DR: {
        Font: {}
      }
    };
    data.DR.Font[this._font.id] = this._font.ref();
    const AcroForm = this.ref(data);
    this._root.data.AcroForm = AcroForm;
    return this;
  },
  /**
   * Called automatically by document.js
   */
  endAcroForm() {
    if (this._root.data.AcroForm) {
      if (!Object.keys(this._acroform.fonts).length && !this._acroform.defaultFont) {
        throw new Error('No fonts specified for PDF form');
      }
      let fontDict = this._root.data.AcroForm.data.DR.Font;
      Object.keys(this._acroform.fonts).forEach(name => {
        fontDict[name] = this._acroform.fonts[name];
      });
      this._root.data.AcroForm.data.Fields.forEach(fieldRef => {
        this._endChild(fieldRef);
      });
      this._root.data.AcroForm.end();
    }
    return this;
  },
  _endChild(ref) {
    if (Array.isArray(ref.data.Kids)) {
      ref.data.Kids.forEach(childRef => {
        this._endChild(childRef);
      });
      ref.end();
    }
    return this;
  },
  /**
   * Creates and adds a form field to the document. Form fields are intermediate
   * nodes in a PDF form that are used to specify form name heirarchy and form
   * value defaults.
   * @param {string} name - field name (T attribute in field dictionary)
   * @param {object} options  - other attributes to include in field dictionary
   */
  formField(name, options = {}) {
    let fieldDict = this._fieldDict(name, null, options);
    let fieldRef = this.ref(fieldDict);
    this._addToParent(fieldRef);
    return fieldRef;
  },
  /**
   * Creates and adds a Form Annotation to the document. Form annotations are
   * called Widget annotations internally within a PDF file.
   * @param {string} name - form field name (T attribute of widget annotation
   * dictionary)
   * @param {number} x
   * @param {number} y
   * @param {number} w
   * @param {number} h
   * @param {object} options
   */
  formAnnotation(name, type, x, y, w, h, options = {}) {
    let fieldDict = this._fieldDict(name, type, options);
    fieldDict.Subtype = 'Widget';
    if (fieldDict.F === undefined) {
      fieldDict.F = 4; // print the annotation
    }

    // Add Field annot to page, and get it's ref
    this.annotate(x, y, w, h, fieldDict);
    let annotRef = this.page.annotations[this.page.annotations.length - 1];
    return this._addToParent(annotRef);
  },
  formText(name, x, y, w, h, options = {}) {
    return this.formAnnotation(name, 'text', x, y, w, h, options);
  },
  formPushButton(name, x, y, w, h, options = {}) {
    return this.formAnnotation(name, 'pushButton', x, y, w, h, options);
  },
  formCombo(name, x, y, w, h, options = {}) {
    return this.formAnnotation(name, 'combo', x, y, w, h, options);
  },
  formList(name, x, y, w, h, options = {}) {
    return this.formAnnotation(name, 'list', x, y, w, h, options);
  },
  formRadioButton(name, x, y, w, h, options = {}) {
    return this.formAnnotation(name, 'radioButton', x, y, w, h, options);
  },
  formCheckbox(name, x, y, w, h, options = {}) {
    return this.formAnnotation(name, 'checkbox', x, y, w, h, options);
  },
  _addToParent(fieldRef) {
    let parent = fieldRef.data.Parent;
    if (parent) {
      if (!parent.data.Kids) {
        parent.data.Kids = [];
      }
      parent.data.Kids.push(fieldRef);
    } else {
      this._root.data.AcroForm.data.Fields.push(fieldRef);
    }
    return this;
  },
  _fieldDict(name, type, options = {}) {
    if (!this._acroform) {
      throw new Error('Call document.initForm() method before adding form elements to document');
    }
    let opts = Object.assign({}, options);
    if (type !== null) {
      opts = this._resolveType(type, options);
    }
    opts = this._resolveFlags(opts);
    opts = this._resolveJustify(opts);
    opts = this._resolveFont(opts);
    opts = this._resolveStrings(opts);
    opts = this._resolveColors(opts);
    opts = this._resolveFormat(opts);
    opts.T = new String(name);
    if (opts.parent) {
      opts.Parent = opts.parent;
      delete opts.parent;
    }
    return opts;
  },
  _resolveType(type, opts) {
    if (type === 'text') {
      opts.FT = 'Tx';
    } else if (type === 'pushButton') {
      opts.FT = 'Btn';
      opts.pushButton = true;
    } else if (type === 'radioButton') {
      opts.FT = 'Btn';
      opts.radioButton = true;
    } else if (type === 'checkbox') {
      opts.FT = 'Btn';
    } else if (type === 'combo') {
      opts.FT = 'Ch';
      opts.combo = true;
    } else if (type === 'list') {
      opts.FT = 'Ch';
    } else {
      throw new Error(`Invalid form annotation type '${type}'`);
    }
    return opts;
  },
  _resolveFormat(opts) {
    const f = opts.format;
    if (f && f.type) {
      let fnKeystroke;
      let fnFormat;
      let params = '';
      if (FORMAT_SPECIAL[f.type] !== undefined) {
        fnKeystroke = `AFSpecial_Keystroke`;
        fnFormat = `AFSpecial_Format`;
        params = FORMAT_SPECIAL[f.type];
      } else {
        let format = f.type.charAt(0).toUpperCase() + f.type.slice(1);
        fnKeystroke = `AF${format}_Keystroke`;
        fnFormat = `AF${format}_Format`;
        if (f.type === 'date') {
          fnKeystroke += 'Ex';
          params = String(f.param);
        } else if (f.type === 'time') {
          params = String(f.param);
        } else if (f.type === 'number') {
          let p = Object.assign({}, FORMAT_DEFAULT.number, f);
          params = String([String(p.nDec), p.sepComma ? '0' : '1', '"' + p.negStyle + '"', 'null', '"' + p.currency + '"', String(p.currencyPrepend)].join(','));
        } else if (f.type === 'percent') {
          let p = Object.assign({}, FORMAT_DEFAULT.percent, f);
          params = String([String(p.nDec), p.sepComma ? '0' : '1'].join(','));
        }
      }
      opts.AA = opts.AA ? opts.AA : {};
      opts.AA.K = {
        S: 'JavaScript',
        JS: new String(`${fnKeystroke}(${params});`)
      };
      opts.AA.F = {
        S: 'JavaScript',
        JS: new String(`${fnFormat}(${params});`)
      };
    }
    delete opts.format;
    return opts;
  },
  _resolveColors(opts) {
    let color = this._normalizeColor(opts.backgroundColor);
    if (color) {
      if (!opts.MK) {
        opts.MK = {};
      }
      opts.MK.BG = color;
    }
    color = this._normalizeColor(opts.borderColor);
    if (color) {
      if (!opts.MK) {
        opts.MK = {};
      }
      opts.MK.BC = color;
    }
    delete opts.backgroundColor;
    delete opts.borderColor;
    return opts;
  },
  _resolveFlags(options) {
    let result = 0;
    Object.keys(options).forEach(key => {
      if (FIELD_FLAGS[key]) {
        if (options[key]) {
          result |= FIELD_FLAGS[key];
        }
        delete options[key];
      }
    });
    if (result !== 0) {
      options.Ff = options.Ff ? options.Ff : 0;
      options.Ff |= result;
    }
    return options;
  },
  _resolveJustify(options) {
    let result = 0;
    if (options.align !== undefined) {
      if (typeof FIELD_JUSTIFY[options.align] === 'number') {
        result = FIELD_JUSTIFY[options.align];
      }
      delete options.align;
    }
    if (result !== 0) {
      options.Q = result; // default
    }
    return options;
  },
  _resolveFont(options) {
    // add current font to document-level AcroForm dict if necessary
    if (this._acroform.fonts[this._font.id] == null) {
      this._acroform.fonts[this._font.id] = this._font.ref();
    }

    // add current font to field's resource dict (RD) if not the default acroform font
    if (this._acroform.defaultFont !== this._font.name) {
      options.DR = {
        Font: {}
      };

      // Get the fontSize option. If not set use auto sizing
      const fontSize = options.fontSize || 0;
      options.DR.Font[this._font.id] = this._font.ref();
      options.DA = new String(`/${this._font.id} ${fontSize} Tf 0 g`);
    }
    return options;
  },
  _resolveStrings(options) {
    let select = [];
    function appendChoices(a) {
      if (Array.isArray(a)) {
        for (let idx = 0; idx < a.length; idx++) {
          if (typeof a[idx] === 'string') {
            select.push(new String(a[idx]));
          } else {
            select.push(a[idx]);
          }
        }
      }
    }
    appendChoices(options.Opt);
    if (options.select) {
      appendChoices(options.select);
      delete options.select;
    }
    if (select.length) {
      options.Opt = select;
    }
    Object.keys(VALUE_MAP).forEach(key => {
      if (options[key] !== undefined) {
        options[VALUE_MAP[key]] = options[key];
        delete options[key];
      }
    });
    ['V', 'DV'].forEach(key => {
      if (typeof options[key] === 'string') {
        options[key] = new String(options[key]);
      }
    });
    if (options.MK && options.MK.CA) {
      options.MK.CA = new String(options.MK.CA);
    }
    if (options.label) {
      options.MK = options.MK ? options.MK : {};
      options.MK.CA = new String(options.label);
      delete options.label;
    }
    return options;
  }
};

var AttachmentsMixin = {
  /**
   * Embed contents of `src` in PDF
   * @param {Buffer | ArrayBuffer | string} src input Buffer, ArrayBuffer, base64 encoded string or path to file
   * @param {object} options
   *  * options.name: filename to be shown in PDF, will use `src` if none set
   *  * options.type: filetype to be shown in PDF
   *  * options.description: description to be shown in PDF
   *  * options.hidden: if true, do not add attachment to EmbeddedFiles dictionary. Useful for file attachment annotations
   *  * options.creationDate: override creation date
   *  * options.modifiedDate: override modified date
   *  * options.relationship: Relationship between the PDF document and its attached file. Can be 'Alternative', 'Data', 'Source', 'Supplement' or 'Unspecified'.
   * @returns filespec reference
   */
  file(src, options = {}) {
    options.name = options.name || src;
    options.relationship = options.relationship || 'Unspecified';
    const refBody = {
      Type: 'EmbeddedFile',
      Params: {}
    };
    let data;
    if (!src) {
      throw new Error('No src specified');
    }
    if (Buffer.isBuffer(src)) {
      data = src;
    } else if (src instanceof ArrayBuffer) {
      data = Buffer.from(new Uint8Array(src));
    } else {
      let match;
      if (match = /^data:(.*?);base64,(.*)$/.exec(src)) {
        if (match[1]) {
          refBody.Subtype = match[1].replace('/', '#2F');
        }
        data = Buffer.from(match[2], 'base64');
      } else {
        data = fs.readFileSync(src);
        if (!data) {
          throw new Error(`Could not read contents of file at filepath ${src}`);
        }

        // update CreationDate and ModDate
        const {
          birthtime,
          ctime
        } = fs.statSync(src);
        refBody.Params.CreationDate = birthtime;
        refBody.Params.ModDate = ctime;
      }
    }

    // override creation date and modified date
    if (options.creationDate instanceof Date) {
      refBody.Params.CreationDate = options.creationDate;
    }
    if (options.modifiedDate instanceof Date) {
      refBody.Params.ModDate = options.modifiedDate;
    }
    // add optional subtype
    if (options.type) {
      refBody.Subtype = options.type.replace('/', '#2F');
    }

    // add checksum and size information
    const checksum = CryptoJS.MD5(CryptoJS.lib.WordArray.create(new Uint8Array(data)));
    refBody.Params.CheckSum = new String(checksum);
    refBody.Params.Size = data.byteLength;

    // save some space when embedding the same file again
    // if a file with the same name and metadata exists, reuse its reference
    let ref;
    if (!this._fileRegistry) this._fileRegistry = {};
    let file = this._fileRegistry[options.name];
    if (file && isEqual(refBody, file)) {
      ref = file.ref;
    } else {
      ref = this.ref(refBody);
      ref.end(data);
      this._fileRegistry[options.name] = {
        ...refBody,
        ref
      };
    }
    // add filespec for embedded file
    const fileSpecBody = {
      Type: 'Filespec',
      AFRelationship: options.relationship,
      F: new String(options.name),
      EF: {
        F: ref
      },
      UF: new String(options.name)
    };
    if (options.description) {
      fileSpecBody.Desc = new String(options.description);
    }
    const filespec = this.ref(fileSpecBody);
    filespec.end();
    if (!options.hidden) {
      this.addNamedEmbeddedFile(options.name, filespec);
    }

    // Add file to the catalogue to be PDF/A3 compliant
    if (this._root.data.AF) {
      this._root.data.AF.push(filespec);
    } else {
      this._root.data.AF = [filespec];
    }
    return filespec;
  }
};

/** check two embedded file metadata objects for equality */
function isEqual(a, b) {
  return a.Subtype === b.Subtype && a.Params.CheckSum.toString() === b.Params.CheckSum.toString() && a.Params.Size === b.Params.Size && a.Params.CreationDate.getTime() === b.Params.CreationDate.getTime() && (a.Params.ModDate === undefined && b.Params.ModDate === undefined || a.Params.ModDate.getTime() === b.Params.ModDate.getTime());
}

var PDFA = {
  initPDFA(pSubset) {
    if (pSubset.charAt(pSubset.length - 3) === '-') {
      this.subset_conformance = pSubset.charAt(pSubset.length - 1).toUpperCase();
      this.subset = parseInt(pSubset.charAt(pSubset.length - 2));
    } else {
      // Default to Basic conformance when user doesn't specify
      this.subset_conformance = 'B';
      this.subset = parseInt(pSubset.charAt(pSubset.length - 1));
    }
  },
  endSubset() {
    this._addPdfaMetadata();
    this._addColorOutputIntent();
  },
  _addColorOutputIntent() {
    const iccProfile = fs.readFileSync(`${__dirname}/data/sRGB_IEC61966_2_1.icc`);
    const colorProfileRef = this.ref({
      Length: iccProfile.length,
      N: 3
    });
    colorProfileRef.write(iccProfile);
    colorProfileRef.end();
    const intentRef = this.ref({
      Type: 'OutputIntent',
      S: 'GTS_PDFA1',
      Info: new String('sRGB IEC61966-2.1'),
      OutputConditionIdentifier: new String('sRGB IEC61966-2.1'),
      DestOutputProfile: colorProfileRef
    });
    intentRef.end();
    this._root.data.OutputIntents = [intentRef];
  },
  _getPdfaid() {
    return `
        <rdf:Description xmlns:pdfaid="http://www.aiim.org/pdfa/ns/id/" rdf:about="">
            <pdfaid:part>${this.subset}</pdfaid:part>
            <pdfaid:conformance>${this.subset_conformance}</pdfaid:conformance>
        </rdf:Description>
        `;
  },
  _addPdfaMetadata() {
    this.appendXML(this._getPdfaid());
  }
};

var PDFUA = {
  initPDFUA() {
    this.subset = 1;
  },
  endSubset() {
    this._addPdfuaMetadata();
  },
  _addPdfuaMetadata() {
    this.appendXML(this._getPdfuaid());
  },
  _getPdfuaid() {
    return `
        <rdf:Description xmlns:pdfuaid="http://www.aiim.org/pdfua/ns/id/" rdf:about="">
            <pdfuaid:part>${this.subset}</pdfuaid:part>
        </rdf:Description>
        `;
  }
};

var SubsetMixin = {
  _importSubset(subset) {
    Object.assign(this, subset);
  },
  initSubset(options) {
    switch (options.subset) {
      case 'PDF/A-1':
      case 'PDF/A-1a':
      case 'PDF/A-1b':
      case 'PDF/A-2':
      case 'PDF/A-2a':
      case 'PDF/A-2b':
      case 'PDF/A-3':
      case 'PDF/A-3a':
      case 'PDF/A-3b':
        this._importSubset(PDFA);
        this.initPDFA(options.subset);
        break;
      case 'PDF/UA':
        this._importSubset(PDFUA);
        this.initPDFUA();
        break;
    }
  }
};

class PDFMetadata {
  constructor() {
    this._metadata = `
        <?xpacket begin="\ufeff" id="W5M0MpCehiHzreSzNTczkc9d"?>
            <x:xmpmeta xmlns:x="adobe:ns:meta/">
                <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
        `;
  }
  _closeTags() {
    this._metadata = this._metadata.concat(`
                </rdf:RDF>
            </x:xmpmeta>
        <?xpacket end="w"?>
        `);
  }
  append(xml, newline = true) {
    this._metadata = this._metadata.concat(xml);
    if (newline) this._metadata = this._metadata.concat('\n');
  }
  getXML() {
    return this._metadata;
  }
  getLength() {
    return this._metadata.length;
  }
  end() {
    this._closeTags();
    this._metadata = this._metadata.trim();
  }
}

var MetadataMixin = {
  initMetadata() {
    this.metadata = new PDFMetadata();
  },
  appendXML(xml, newline = true) {
    this.metadata.append(xml, newline);
  },
  _addInfo() {
    this.appendXML(`
        <rdf:Description rdf:about="" xmlns:xmp="http://ns.adobe.com/xap/1.0/">
            <xmp:CreateDate>${this.info.CreationDate.toISOString().split('.')[0] + "Z"}</xmp:CreateDate>
            <xmp:CreatorTool>${this.info.Creator}</xmp:CreatorTool>
        </rdf:Description>
        `);
    if (this.info.Title || this.info.Author || this.info.Subject) {
      this.appendXML(`
            <rdf:Description rdf:about="" xmlns:dc="http://purl.org/dc/elements/1.1/">
            `);
      if (this.info.Title) {
        this.appendXML(`
                <dc:title>
                    <rdf:Alt>
                        <rdf:li xml:lang="x-default">${this.info.Title}</rdf:li>
                    </rdf:Alt>
                </dc:title>
                `);
      }
      if (this.info.Author) {
        this.appendXML(`
                <dc:creator>
                    <rdf:Seq>
                        <rdf:li>${this.info.Author}</rdf:li>
                    </rdf:Seq>
                </dc:creator>
                `);
      }
      if (this.info.Subject) {
        this.appendXML(`
                <dc:description>
                    <rdf:Alt>
                        <rdf:li xml:lang="x-default">${this.info.Subject}</rdf:li>
                    </rdf:Alt>
                </dc:description>
                `);
      }
      this.appendXML(`
            </rdf:Description>
            `);
    }
    this.appendXML(`
        <rdf:Description rdf:about="" xmlns:pdf="http://ns.adobe.com/pdf/1.3/">
            <pdf:Producer>${this.info.Creator}</pdf:Producer>`, false);
    if (this.info.Keywords) {
      this.appendXML(`
            <pdf:Keywords>${this.info.Keywords}</pdf:Keywords>`, false);
    }
    this.appendXML(`
        </rdf:Description>
        `);
  },
  endMetadata() {
    this._addInfo();
    this.metadata.end();

    /*
    Metadata was introduced in PDF 1.4, so adding it to 1.3 
    will likely only take up more space.
    */
    if (this.version != 1.3) {
      this.metadataRef = this.ref({
        length: this.metadata.getLength(),
        Type: 'Metadata',
        Subtype: 'XML'
      });
      this.metadataRef.compress = false;
      this.metadataRef.write(Buffer.from(this.metadata.getXML(), 'utf-8'));
      this.metadataRef.end();
      this._root.data.Metadata = this.metadataRef;
    }
  }
};

/*
PDFDocument - represents an entire PDF document
By Devon Govett
*/
class PDFDocument extends stream.Readable {
  constructor(options = {}) {
    super(options);
    this.options = options;

    // PDF version
    switch (options.pdfVersion) {
      case '1.4':
        this.version = 1.4;
        break;
      case '1.5':
        this.version = 1.5;
        break;
      case '1.6':
        this.version = 1.6;
        break;
      case '1.7':
      case '1.7ext3':
        this.version = 1.7;
        break;
      default:
        this.version = 1.3;
        break;
    }

    // Whether streams should be compressed
    this.compress = this.options.compress != null ? this.options.compress : true;
    this._pageBuffer = [];
    this._pageBufferStart = 0;

    // The PDF object store
    this._offsets = [];
    this._waiting = 0;
    this._ended = false;
    this._offset = 0;
    const Pages = this.ref({
      Type: 'Pages',
      Count: 0,
      Kids: []
    });
    const Names = this.ref({
      Dests: new PDFNameTree()
    });
    this._root = this.ref({
      Type: 'Catalog',
      Pages,
      Names
    });
    if (this.options.lang) {
      this._root.data.Lang = new String(this.options.lang);
    }

    // The current page
    this.page = null;

    // Initialize mixins
    this.initMetadata();
    this.initColor();
    this.initVector();
    this.initFonts(options.font);
    this.initText();
    this.initImages();
    this.initOutline();
    this.initMarkings(options);
    this.initSubset(options);

    // Initialize the metadata
    this.info = {
      Producer: 'PDFKit',
      Creator: 'PDFKit',
      CreationDate: new Date()
    };
    if (this.options.info) {
      for (let key in this.options.info) {
        const val = this.options.info[key];
        this.info[key] = val;
      }
    }
    if (this.options.displayTitle) {
      this._root.data.ViewerPreferences = this.ref({
        DisplayDocTitle: true
      });
    }

    // Generate file ID
    this._id = PDFSecurity.generateFileID(this.info);

    // Initialize security settings
    this._security = PDFSecurity.create(this, options);

    // Write the header
    // PDF version
    this._write(`%PDF-${this.version}`);

    // 4 binary chars, as recommended by the spec
    this._write('%\xFF\xFF\xFF\xFF');

    // Add the first page
    if (this.options.autoFirstPage !== false) {
      this.addPage();
    }
  }
  addPage(options) {
    if (options == null) {
      ({
        options
      } = this);
    }

    // end the current page if needed
    if (!this.options.bufferPages) {
      this.flushPages();
    }

    // create a page object
    this.page = new PDFPage(this, options);
    this._pageBuffer.push(this.page);

    // add the page to the object store
    const pages = this._root.data.Pages.data;
    pages.Kids.push(this.page.dictionary);
    pages.Count++;

    // reset x and y coordinates
    this.x = this.page.margins.left;
    this.y = this.page.margins.top;

    // flip PDF coordinate system so that the origin is in
    // the top left rather than the bottom left
    this._ctm = [1, 0, 0, 1, 0, 0];
    this.transform(1, 0, 0, -1, 0, this.page.height);
    this.emit('pageAdded');
    return this;
  }
  continueOnNewPage(options) {
    const pageMarkings = this.endPageMarkings(this.page);
    this.addPage(options);
    this.initPageMarkings(pageMarkings);
    return this;
  }
  bufferedPageRange() {
    return {
      start: this._pageBufferStart,
      count: this._pageBuffer.length
    };
  }
  switchToPage(n) {
    let page;
    if (!(page = this._pageBuffer[n - this._pageBufferStart])) {
      throw new Error(`switchToPage(${n}) out of bounds, current buffer covers pages ${this._pageBufferStart} to ${this._pageBufferStart + this._pageBuffer.length - 1}`);
    }
    return this.page = page;
  }
  flushPages() {
    // this local variable exists so we're future-proof against
    // reentrant calls to flushPages.
    const pages = this._pageBuffer;
    this._pageBuffer = [];
    this._pageBufferStart += pages.length;
    for (let page of pages) {
      this.endPageMarkings(page);
      page.end();
    }
  }
  addNamedDestination(name, ...args) {
    if (args.length === 0) {
      args = ['XYZ', null, null, null];
    }
    if (args[0] === 'XYZ' && args[2] !== null) {
      args[2] = this.page.height - args[2];
    }
    args.unshift(this.page.dictionary);
    this._root.data.Names.data.Dests.add(name, args);
  }
  addNamedEmbeddedFile(name, ref) {
    if (!this._root.data.Names.data.EmbeddedFiles) {
      // disabling /Limits for this tree fixes attachments not showing in Adobe Reader
      this._root.data.Names.data.EmbeddedFiles = new PDFNameTree({
        limits: false
      });
    }

    // add filespec to EmbeddedFiles
    this._root.data.Names.data.EmbeddedFiles.add(name, ref);
  }
  addNamedJavaScript(name, js) {
    if (!this._root.data.Names.data.JavaScript) {
      this._root.data.Names.data.JavaScript = new PDFNameTree();
    }
    let data = {
      JS: new String(js),
      S: 'JavaScript'
    };
    this._root.data.Names.data.JavaScript.add(name, data);
  }
  ref(data) {
    const ref = new PDFReference(this, this._offsets.length + 1, data);
    this._offsets.push(null); // placeholder for this object's offset once it is finalized
    this._waiting++;
    return ref;
  }
  _read() {}
  // do nothing, but this method is required by node

  _write(data) {
    if (!Buffer.isBuffer(data)) {
      data = Buffer.from(data + '\n', 'binary');
    }
    this.push(data);
    return this._offset += data.length;
  }
  addContent(data) {
    this.page.write(data);
    return this;
  }
  _refEnd(ref) {
    this._offsets[ref.id - 1] = ref.offset;
    if (--this._waiting === 0 && this._ended) {
      this._finalize();
      return this._ended = false;
    }
  }
  end() {
    this.flushPages();
    this._info = this.ref();
    for (let key in this.info) {
      let val = this.info[key];
      if (typeof val === 'string') {
        val = new String(val);
      }
      let entry = this.ref(val);
      entry.end();
      this._info.data[key] = entry;
    }
    this._info.end();
    for (let name in this._fontFamilies) {
      const font = this._fontFamilies[name];
      font.finalize();
    }
    this.endOutline();
    this.endMarkings();
    if (this.subset) {
      this.endSubset();
    }
    this.endMetadata();
    this._root.end();
    this._root.data.Pages.end();
    this._root.data.Names.end();
    this.endAcroForm();
    if (this._root.data.ViewerPreferences) {
      this._root.data.ViewerPreferences.end();
    }
    if (this._security) {
      this._security.end();
    }
    if (this._waiting === 0) {
      return this._finalize();
    } else {
      return this._ended = true;
    }
  }
  _finalize() {
    // generate xref
    const xRefOffset = this._offset;
    this._write('xref');
    this._write(`0 ${this._offsets.length + 1}`);
    this._write('0000000000 65535 f ');
    for (let offset of this._offsets) {
      offset = `0000000000${offset}`.slice(-10);
      this._write(offset + ' 00000 n ');
    }

    // trailer
    const trailer = {
      Size: this._offsets.length + 1,
      Root: this._root,
      Info: this._info,
      ID: [this._id, this._id]
    };
    if (this._security) {
      trailer.Encrypt = this._security.dictionary;
    }
    this._write('trailer');
    this._write(PDFObject.convert(trailer));
    this._write('startxref');
    this._write(`${xRefOffset}`);
    this._write('%%EOF');

    // end the stream
    return this.push(null);
  }
  toString() {
    return '[object PDFDocument]';
  }
}
const mixin = methods => {
  Object.assign(PDFDocument.prototype, methods);
};
mixin(MetadataMixin);
mixin(ColorMixin);
mixin(VectorMixin);
mixin(FontsMixin);
mixin(TextMixin);
mixin(ImagesMixin);
mixin(AnnotationsMixin);
mixin(OutlineMixin);
mixin(MarkingsMixin);
mixin(AcroFormMixin);
mixin(AttachmentsMixin);
mixin(SubsetMixin);
PDFDocument.LineWrapper = LineWrapper;

module.exports = PDFDocument;
//# sourceMappingURL=pdfkit.js.map
