pdfjs-dist/lib/core/fonts_utils.js

/**
 * @licstart The following is the entire license notice for the
 * Javascript code in this page
 *
 * Copyright 2022 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * @licend The above is the entire license notice for the
 * Javascript code in this page
 */
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.SEAC_ANALYSIS_ENABLED = exports.MacStandardGlyphOrdering = exports.FontFlags = void 0;
exports.getFontType = getFontType;
exports.normalizeFontName = normalizeFontName;
exports.recoverGlyphName = recoverGlyphName;
exports.type1FontGlyphMapping = type1FontGlyphMapping;

var _util = require("../shared/util.js");

var _encodings = require("./encodings.js");

var _glyphlist = require("./glyphlist.js");

var _unicode = require("./unicode.js");

const SEAC_ANALYSIS_ENABLED = true;
exports.SEAC_ANALYSIS_ENABLED = SEAC_ANALYSIS_ENABLED;
const FontFlags = {
  FixedPitch: 1,
  Serif: 2,
  Symbolic: 4,
  Script: 8,
  Nonsymbolic: 32,
  Italic: 64,
  AllCap: 65536,
  SmallCap: 131072,
  ForceBold: 262144
};
exports.FontFlags = FontFlags;
const MacStandardGlyphOrdering = [".notdef", ".null", "nonmarkingreturn", "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", "Adieresis", "Aring", "Ccedilla", "Eacute", "Ntilde", "Odieresis", "Udieresis", "aacute", "agrave", "acircumflex", "adieresis", "atilde", "aring", "ccedilla", "eacute", "egrave", "ecircumflex", "edieresis", "iacute", "igrave", "icircumflex", "idieresis", "ntilde", "oacute", "ograve", "ocircumflex", "odieresis", "otilde", "uacute", "ugrave", "ucircumflex", "udieresis", "dagger", "degree", "cent", "sterling", "section", "bullet", "paragraph", "germandbls", "registered", "copyright", "trademark", "acute", "dieresis", "notequal", "AE", "Oslash", "infinity", "plusminus", "lessequal", "greaterequal", "yen", "mu", "partialdiff", "summation", "product", "pi", "integral", "ordfeminine", "ordmasculine", "Omega", "ae", "oslash", "questiondown", "exclamdown", "logicalnot", "radical", "florin", "approxequal", "Delta", "guillemotleft", "guillemotright", "ellipsis", "nonbreakingspace", "Agrave", "Atilde", "Otilde", "OE", "oe", "endash", "emdash", "quotedblleft", "quotedblright", "quoteleft", "quoteright", "divide", "lozenge", "ydieresis", "Ydieresis", "fraction", "currency", "guilsinglleft", "guilsinglright", "fi", "fl", "daggerdbl", "periodcentered", "quotesinglbase", "quotedblbase", "perthousand", "Acircumflex", "Ecircumflex", "Aacute", "Edieresis", "Egrave", "Iacute", "Icircumflex", "Idieresis", "Igrave", "Oacute", "Ocircumflex", "apple", "Ograve", "Uacute", "Ucircumflex", "Ugrave", "dotlessi", "circumflex", "tilde", "macron", "breve", "dotaccent", "ring", "cedilla", "hungarumlaut", "ogonek", "caron", "Lslash", "lslash", "Scaron", "scaron", "Zcaron", "zcaron", "brokenbar", "Eth", "eth", "Yacute", "yacute", "Thorn", "thorn", "minus", "multiply", "onesuperior", "twosuperior", "threesuperior", "onehalf", "onequarter", "threequarters", "franc", "Gbreve", "gbreve", "Idotaccent", "Scedilla", "scedilla", "Cacute", "cacute", "Ccaron", "ccaron", "dcroat"];
exports.MacStandardGlyphOrdering = MacStandardGlyphOrdering;

function getFontType(type, subtype, isStandardFont = false) {
  switch (type) {
    case "Type1":
      if (isStandardFont) {
        return _util.FontType.TYPE1STANDARD;
      }

      return subtype === "Type1C" ? _util.FontType.TYPE1C : _util.FontType.TYPE1;

    case "CIDFontType0":
      return subtype === "CIDFontType0C" ? _util.FontType.CIDFONTTYPE0C : _util.FontType.CIDFONTTYPE0;

    case "OpenType":
      return _util.FontType.OPENTYPE;

    case "TrueType":
      return _util.FontType.TRUETYPE;

    case "CIDFontType2":
      return _util.FontType.CIDFONTTYPE2;

    case "MMType1":
      return _util.FontType.MMTYPE1;

    case "Type0":
      return _util.FontType.TYPE0;

    default:
      return _util.FontType.UNKNOWN;
  }
}

function recoverGlyphName(name, glyphsUnicodeMap) {
  if (glyphsUnicodeMap[name] !== undefined) {
    return name;
  }

  const unicode = (0, _unicode.getUnicodeForGlyph)(name, glyphsUnicodeMap);

  if (unicode !== -1) {
    for (const key in glyphsUnicodeMap) {
      if (glyphsUnicodeMap[key] === unicode) {
        return key;
      }
    }
  }

  (0, _util.info)("Unable to recover a standard glyph name for: " + name);
  return name;
}

function type1FontGlyphMapping(properties, builtInEncoding, glyphNames) {
  const charCodeToGlyphId = Object.create(null);
  let glyphId, charCode, baseEncoding;
  const isSymbolicFont = !!(properties.flags & FontFlags.Symbolic);

  if (properties.isInternalFont) {
    baseEncoding = builtInEncoding;

    for (charCode = 0; charCode < baseEncoding.length; charCode++) {
      glyphId = glyphNames.indexOf(baseEncoding[charCode]);

      if (glyphId >= 0) {
        charCodeToGlyphId[charCode] = glyphId;
      } else {
        charCodeToGlyphId[charCode] = 0;
      }
    }
  } else if (properties.baseEncodingName) {
    baseEncoding = (0, _encodings.getEncoding)(properties.baseEncodingName);

    for (charCode = 0; charCode < baseEncoding.length; charCode++) {
      glyphId = glyphNames.indexOf(baseEncoding[charCode]);

      if (glyphId >= 0) {
        charCodeToGlyphId[charCode] = glyphId;
      } else {
        charCodeToGlyphId[charCode] = 0;
      }
    }
  } else if (isSymbolicFont) {
    for (charCode in builtInEncoding) {
      charCodeToGlyphId[charCode] = builtInEncoding[charCode];
    }
  } else {
    baseEncoding = _encodings.StandardEncoding;

    for (charCode = 0; charCode < baseEncoding.length; charCode++) {
      glyphId = glyphNames.indexOf(baseEncoding[charCode]);

      if (glyphId >= 0) {
        charCodeToGlyphId[charCode] = glyphId;
      } else {
        charCodeToGlyphId[charCode] = 0;
      }
    }
  }

  const differences = properties.differences;
  let glyphsUnicodeMap;

  if (differences) {
    for (charCode in differences) {
      const glyphName = differences[charCode];
      glyphId = glyphNames.indexOf(glyphName);

      if (glyphId === -1) {
        if (!glyphsUnicodeMap) {
          glyphsUnicodeMap = (0, _glyphlist.getGlyphsUnicode)();
        }

        const standardGlyphName = recoverGlyphName(glyphName, glyphsUnicodeMap);

        if (standardGlyphName !== glyphName) {
          glyphId = glyphNames.indexOf(standardGlyphName);
        }
      }

      if (glyphId >= 0) {
        charCodeToGlyphId[charCode] = glyphId;
      } else {
        charCodeToGlyphId[charCode] = 0;
      }
    }
  }

  return charCodeToGlyphId;
}

function normalizeFontName(name) {
  return name.replace(/[,_]/g, "-").replace(/\s/g, "");
}