pdfjs-dist/lib/core/evaluator.js

/**
 * @licstart The following is the entire license notice for the
 * Javascript code in this page
 *
 * Copyright 2021 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.PartialEvaluator = exports.EvaluatorPreprocessor = void 0;

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

var _cmap = require("./cmap.js");

var _primitives = require("./primitives.js");

var _fonts = require("./fonts.js");

var _fonts_utils = require("./fonts_utils.js");

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

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

var _standard_fonts = require("./standard_fonts.js");

var _pattern = require("./pattern.js");

var _to_unicode_map = require("./to_unicode_map.js");

var _function = require("./function.js");

var _parser = require("./parser.js");

var _image_utils = require("./image_utils.js");

var _bidi = require("./bidi.js");

var _colorspace = require("./colorspace.js");

var _decode_stream = require("./decode_stream.js");

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

var _core_utils = require("./core_utils.js");

var _metrics = require("./metrics.js");

var _murmurhash = require("./murmurhash3.js");

var _stream = require("./stream.js");

var _operator_list = require("./operator_list.js");

var _image = require("./image.js");

const DefaultPartialEvaluatorOptions = Object.freeze({
  maxImageSize: -1,
  disableFontFace: false,
  ignoreErrors: false,
  isEvalSupported: true,
  fontExtraProperties: false
});
const PatternType = {
  TILING: 1,
  SHADING: 2
};
const deferred = Promise.resolve();

function normalizeBlendMode(value, parsingArray = false) {
  if (Array.isArray(value)) {
    for (let i = 0, ii = value.length; i < ii; i++) {
      const maybeBM = normalizeBlendMode(value[i], true);

      if (maybeBM) {
        return maybeBM;
      }
    }

    (0, _util.warn)(`Unsupported blend mode Array: ${value}`);
    return "source-over";
  }

  if (!(0, _primitives.isName)(value)) {
    if (parsingArray) {
      return null;
    }

    return "source-over";
  }

  switch (value.name) {
    case "Normal":
    case "Compatible":
      return "source-over";

    case "Multiply":
      return "multiply";

    case "Screen":
      return "screen";

    case "Overlay":
      return "overlay";

    case "Darken":
      return "darken";

    case "Lighten":
      return "lighten";

    case "ColorDodge":
      return "color-dodge";

    case "ColorBurn":
      return "color-burn";

    case "HardLight":
      return "hard-light";

    case "SoftLight":
      return "soft-light";

    case "Difference":
      return "difference";

    case "Exclusion":
      return "exclusion";

    case "Hue":
      return "hue";

    case "Saturation":
      return "saturation";

    case "Color":
      return "color";

    case "Luminosity":
      return "luminosity";
  }

  if (parsingArray) {
    return null;
  }

  (0, _util.warn)(`Unsupported blend mode: ${value.name}`);
  return "source-over";
}

class TimeSlotManager {
  static get TIME_SLOT_DURATION_MS() {
    return (0, _util.shadow)(this, "TIME_SLOT_DURATION_MS", 20);
  }

  static get CHECK_TIME_EVERY() {
    return (0, _util.shadow)(this, "CHECK_TIME_EVERY", 100);
  }

  constructor() {
    this.reset();
  }

  check() {
    if (++this.checked < TimeSlotManager.CHECK_TIME_EVERY) {
      return false;
    }

    this.checked = 0;
    return this.endTime <= Date.now();
  }

  reset() {
    this.endTime = Date.now() + TimeSlotManager.TIME_SLOT_DURATION_MS;
    this.checked = 0;
  }

}

class PartialEvaluator {
  constructor({
    xref,
    handler,
    pageIndex,
    idFactory,
    fontCache,
    builtInCMapCache,
    globalImageCache,
    options = null
  }) {
    this.xref = xref;
    this.handler = handler;
    this.pageIndex = pageIndex;
    this.idFactory = idFactory;
    this.fontCache = fontCache;
    this.builtInCMapCache = builtInCMapCache;
    this.globalImageCache = globalImageCache;
    this.options = options || DefaultPartialEvaluatorOptions;
    this.parsingType3Font = false;
    this._fetchBuiltInCMapBound = this.fetchBuiltInCMap.bind(this);
  }

  get _pdfFunctionFactory() {
    const pdfFunctionFactory = new _function.PDFFunctionFactory({
      xref: this.xref,
      isEvalSupported: this.options.isEvalSupported
    });
    return (0, _util.shadow)(this, "_pdfFunctionFactory", pdfFunctionFactory);
  }

  clone(newOptions = DefaultPartialEvaluatorOptions) {
    const newEvaluator = Object.create(this);
    newEvaluator.options = newOptions;
    return newEvaluator;
  }

  hasBlendModes(resources, nonBlendModesSet) {
    if (!(resources instanceof _primitives.Dict)) {
      return false;
    }

    if (resources.objId && nonBlendModesSet.has(resources.objId)) {
      return false;
    }

    const processed = new _primitives.RefSet(nonBlendModesSet);

    if (resources.objId) {
      processed.put(resources.objId);
    }

    const nodes = [resources],
          xref = this.xref;

    while (nodes.length) {
      const node = nodes.shift();
      const graphicStates = node.get("ExtGState");

      if (graphicStates instanceof _primitives.Dict) {
        for (let graphicState of graphicStates.getRawValues()) {
          if (graphicState instanceof _primitives.Ref) {
            if (processed.has(graphicState)) {
              continue;
            }

            try {
              graphicState = xref.fetch(graphicState);
            } catch (ex) {
              processed.put(graphicState);
              (0, _util.info)(`hasBlendModes - ignoring ExtGState: "${ex}".`);
              continue;
            }
          }

          if (!(graphicState instanceof _primitives.Dict)) {
            continue;
          }

          if (graphicState.objId) {
            processed.put(graphicState.objId);
          }

          const bm = graphicState.get("BM");

          if (bm instanceof _primitives.Name) {
            if (bm.name !== "Normal") {
              return true;
            }

            continue;
          }

          if (bm !== undefined && Array.isArray(bm)) {
            for (const element of bm) {
              if (element instanceof _primitives.Name && element.name !== "Normal") {
                return true;
              }
            }
          }
        }
      }

      const xObjects = node.get("XObject");

      if (!(xObjects instanceof _primitives.Dict)) {
        continue;
      }

      for (let xObject of xObjects.getRawValues()) {
        if (xObject instanceof _primitives.Ref) {
          if (processed.has(xObject)) {
            continue;
          }

          try {
            xObject = xref.fetch(xObject);
          } catch (ex) {
            processed.put(xObject);
            (0, _util.info)(`hasBlendModes - ignoring XObject: "${ex}".`);
            continue;
          }
        }

        if (!(0, _primitives.isStream)(xObject)) {
          continue;
        }

        if (xObject.dict.objId) {
          processed.put(xObject.dict.objId);
        }

        const xResources = xObject.dict.get("Resources");

        if (!(xResources instanceof _primitives.Dict)) {
          continue;
        }

        if (xResources.objId && processed.has(xResources.objId)) {
          continue;
        }

        nodes.push(xResources);

        if (xResources.objId) {
          processed.put(xResources.objId);
        }
      }
    }

    processed.forEach(ref => {
      nonBlendModesSet.put(ref);
    });
    return false;
  }

  async fetchBuiltInCMap(name) {
    const cachedData = this.builtInCMapCache.get(name);

    if (cachedData) {
      return cachedData;
    }

    const readableStream = this.handler.sendWithStream("FetchBuiltInCMap", {
      name
    });
    const reader = readableStream.getReader();
    const data = await new Promise(function (resolve, reject) {
      function pump() {
        reader.read().then(function ({
          value,
          done
        }) {
          if (done) {
            return;
          }

          resolve(value);
          pump();
        }, reject);
      }

      pump();
    });

    if (data.compressionType !== _util.CMapCompressionType.NONE) {
      this.builtInCMapCache.set(name, data);
    }

    return data;
  }

  async buildFormXObject(resources, xobj, smask, operatorList, task, initialState, localColorSpaceCache) {
    const dict = xobj.dict;
    const matrix = dict.getArray("Matrix");
    let bbox = dict.getArray("BBox");

    if (Array.isArray(bbox) && bbox.length === 4) {
      bbox = _util.Util.normalizeRect(bbox);
    } else {
      bbox = null;
    }

    let optionalContent = null,
        groupOptions;

    if (dict.has("OC")) {
      optionalContent = await this.parseMarkedContentProps(dict.get("OC"), resources);
      operatorList.addOp(_util.OPS.beginMarkedContentProps, ["OC", optionalContent]);
    }

    const group = dict.get("Group");

    if (group) {
      groupOptions = {
        matrix,
        bbox,
        smask,
        isolated: false,
        knockout: false
      };
      const groupSubtype = group.get("S");
      let colorSpace = null;

      if ((0, _primitives.isName)(groupSubtype, "Transparency")) {
        groupOptions.isolated = group.get("I") || false;
        groupOptions.knockout = group.get("K") || false;

        if (group.has("CS")) {
          const cs = group.getRaw("CS");

          const cachedColorSpace = _colorspace.ColorSpace.getCached(cs, this.xref, localColorSpaceCache);

          if (cachedColorSpace) {
            colorSpace = cachedColorSpace;
          } else {
            colorSpace = await this.parseColorSpace({
              cs,
              resources,
              localColorSpaceCache
            });
          }
        }
      }

      if (smask && smask.backdrop) {
        colorSpace = colorSpace || _colorspace.ColorSpace.singletons.rgb;
        smask.backdrop = colorSpace.getRgb(smask.backdrop, 0);
      }

      operatorList.addOp(_util.OPS.beginGroup, [groupOptions]);
    }

    operatorList.addOp(_util.OPS.paintFormXObjectBegin, [matrix, bbox]);
    return this.getOperatorList({
      stream: xobj,
      task,
      resources: dict.get("Resources") || resources,
      operatorList,
      initialState
    }).then(function () {
      operatorList.addOp(_util.OPS.paintFormXObjectEnd, []);

      if (group) {
        operatorList.addOp(_util.OPS.endGroup, [groupOptions]);
      }

      if (optionalContent) {
        operatorList.addOp(_util.OPS.endMarkedContent, []);
      }
    });
  }

  _sendImgData(objId, imgData, cacheGlobally = false) {
    const transfers = imgData ? [imgData.data.buffer] : null;

    if (this.parsingType3Font || cacheGlobally) {
      return this.handler.send("commonobj", [objId, "Image", imgData], transfers);
    }

    return this.handler.send("obj", [objId, this.pageIndex, "Image", imgData], transfers);
  }

  async buildPaintImageXObject({
    resources,
    image,
    isInline = false,
    operatorList,
    cacheKey,
    localImageCache,
    localColorSpaceCache
  }) {
    const dict = image.dict;
    const imageRef = dict.objId;
    const w = dict.get("Width", "W");
    const h = dict.get("Height", "H");

    if (!(w && (0, _util.isNum)(w)) || !(h && (0, _util.isNum)(h))) {
      (0, _util.warn)("Image dimensions are missing, or not numbers.");
      return undefined;
    }

    const maxImageSize = this.options.maxImageSize;

    if (maxImageSize !== -1 && w * h > maxImageSize) {
      (0, _util.warn)("Image exceeded maximum allowed size and was removed.");
      return undefined;
    }

    const imageMask = dict.get("ImageMask", "IM") || false;
    let imgData, args;

    if (imageMask) {
      const width = dict.get("Width", "W");
      const height = dict.get("Height", "H");
      const bitStrideLength = width + 7 >> 3;
      const imgArray = image.getBytes(bitStrideLength * height, true);
      const decode = dict.getArray("Decode", "D");
      imgData = _image.PDFImage.createMask({
        imgArray,
        width,
        height,
        imageIsFromDecodeStream: image instanceof _decode_stream.DecodeStream,
        inverseDecode: !!decode && decode[0] > 0
      });
      imgData.cached = !!cacheKey;
      args = [imgData];
      operatorList.addOp(_util.OPS.paintImageMaskXObject, args);

      if (cacheKey) {
        localImageCache.set(cacheKey, imageRef, {
          fn: _util.OPS.paintImageMaskXObject,
          args
        });
      }

      return undefined;
    }

    const softMask = dict.get("SMask", "SM") || false;
    const mask = dict.get("Mask") || false;
    const SMALL_IMAGE_DIMENSIONS = 200;

    if (isInline && !softMask && !mask && w + h < SMALL_IMAGE_DIMENSIONS) {
      const imageObj = new _image.PDFImage({
        xref: this.xref,
        res: resources,
        image,
        isInline,
        pdfFunctionFactory: this._pdfFunctionFactory,
        localColorSpaceCache
      });
      imgData = imageObj.createImageData(true);
      operatorList.addOp(_util.OPS.paintInlineImageXObject, [imgData]);
      return undefined;
    }

    let objId = `img_${this.idFactory.createObjId()}`,
        cacheGlobally = false;

    if (this.parsingType3Font) {
      objId = `${this.idFactory.getDocId()}_type3_${objId}`;
    } else if (imageRef) {
      cacheGlobally = this.globalImageCache.shouldCache(imageRef, this.pageIndex);

      if (cacheGlobally) {
        objId = `${this.idFactory.getDocId()}_${objId}`;
      }
    }

    operatorList.addDependency(objId);
    args = [objId, w, h];

    _image.PDFImage.buildImage({
      xref: this.xref,
      res: resources,
      image,
      isInline,
      pdfFunctionFactory: this._pdfFunctionFactory,
      localColorSpaceCache
    }).then(imageObj => {
      imgData = imageObj.createImageData(false);

      if (cacheKey && imageRef && cacheGlobally) {
        this.globalImageCache.addByteSize(imageRef, imgData.data.length);
      }

      return this._sendImgData(objId, imgData, cacheGlobally);
    }).catch(reason => {
      (0, _util.warn)(`Unable to decode image "${objId}": "${reason}".`);
      return this._sendImgData(objId, null, cacheGlobally);
    });

    operatorList.addOp(_util.OPS.paintImageXObject, args);

    if (cacheKey) {
      localImageCache.set(cacheKey, imageRef, {
        fn: _util.OPS.paintImageXObject,
        args
      });

      if (imageRef) {
        (0, _util.assert)(!isInline, "Cannot cache an inline image globally.");
        this.globalImageCache.addPageIndex(imageRef, this.pageIndex);

        if (cacheGlobally) {
          this.globalImageCache.setData(imageRef, {
            objId,
            fn: _util.OPS.paintImageXObject,
            args,
            byteSize: 0
          });
        }
      }
    }

    return undefined;
  }

  handleSMask(smask, resources, operatorList, task, stateManager, localColorSpaceCache) {
    const smaskContent = smask.get("G");
    const smaskOptions = {
      subtype: smask.get("S").name,
      backdrop: smask.get("BC")
    };
    const transferObj = smask.get("TR");

    if ((0, _function.isPDFFunction)(transferObj)) {
      const transferFn = this._pdfFunctionFactory.create(transferObj);

      const transferMap = new Uint8Array(256);
      const tmp = new Float32Array(1);

      for (let i = 0; i < 256; i++) {
        tmp[0] = i / 255;
        transferFn(tmp, 0, tmp, 0);
        transferMap[i] = tmp[0] * 255 | 0;
      }

      smaskOptions.transferMap = transferMap;
    }

    return this.buildFormXObject(resources, smaskContent, smaskOptions, operatorList, task, stateManager.state.clone(), localColorSpaceCache);
  }

  handleTransferFunction(tr) {
    let transferArray;

    if (Array.isArray(tr)) {
      transferArray = tr;
    } else if ((0, _function.isPDFFunction)(tr)) {
      transferArray = [tr];
    } else {
      return null;
    }

    const transferMaps = [];
    let numFns = 0,
        numEffectfulFns = 0;

    for (const entry of transferArray) {
      const transferObj = this.xref.fetchIfRef(entry);
      numFns++;

      if ((0, _primitives.isName)(transferObj, "Identity")) {
        transferMaps.push(null);
        continue;
      } else if (!(0, _function.isPDFFunction)(transferObj)) {
        return null;
      }

      const transferFn = this._pdfFunctionFactory.create(transferObj);

      const transferMap = new Uint8Array(256),
            tmp = new Float32Array(1);

      for (let j = 0; j < 256; j++) {
        tmp[0] = j / 255;
        transferFn(tmp, 0, tmp, 0);
        transferMap[j] = tmp[0] * 255 | 0;
      }

      transferMaps.push(transferMap);
      numEffectfulFns++;
    }

    if (!(numFns === 1 || numFns === 4)) {
      return null;
    }

    if (numEffectfulFns === 0) {
      return null;
    }

    return transferMaps;
  }

  handleTilingType(fn, color, resources, pattern, patternDict, operatorList, task, cacheKey, localTilingPatternCache) {
    const tilingOpList = new _operator_list.OperatorList();

    const patternResources = _primitives.Dict.merge({
      xref: this.xref,
      dictArray: [patternDict.get("Resources"), resources]
    });

    return this.getOperatorList({
      stream: pattern,
      task,
      resources: patternResources,
      operatorList: tilingOpList
    }).then(function () {
      const operatorListIR = tilingOpList.getIR();
      const tilingPatternIR = (0, _pattern.getTilingPatternIR)(operatorListIR, patternDict, color);
      operatorList.addDependencies(tilingOpList.dependencies);
      operatorList.addOp(fn, tilingPatternIR);

      if (cacheKey) {
        localTilingPatternCache.set(cacheKey, patternDict.objId, {
          operatorListIR,
          dict: patternDict
        });
      }
    }).catch(reason => {
      if (reason instanceof _util.AbortException) {
        return;
      }

      if (this.options.ignoreErrors) {
        this.handler.send("UnsupportedFeature", {
          featureId: _util.UNSUPPORTED_FEATURES.errorTilingPattern
        });
        (0, _util.warn)(`handleTilingType - ignoring pattern: "${reason}".`);
        return;
      }

      throw reason;
    });
  }

  handleSetFont(resources, fontArgs, fontRef, operatorList, task, state, fallbackFontDict = null, cssFontInfo = null) {
    const fontName = fontArgs && fontArgs[0] instanceof _primitives.Name ? fontArgs[0].name : null;
    return this.loadFont(fontName, fontRef, resources, fallbackFontDict, cssFontInfo).then(translated => {
      if (!translated.font.isType3Font) {
        return translated;
      }

      return translated.loadType3Data(this, resources, task).then(function () {
        operatorList.addDependencies(translated.type3Dependencies);
        return translated;
      }).catch(reason => {
        this.handler.send("UnsupportedFeature", {
          featureId: _util.UNSUPPORTED_FEATURES.errorFontLoadType3
        });
        return new TranslatedFont({
          loadedName: "g_font_error",
          font: new _fonts.ErrorFont(`Type3 font load error: ${reason}`),
          dict: translated.font,
          evaluatorOptions: this.options
        });
      });
    }).then(translated => {
      state.font = translated.font;
      translated.send(this.handler);
      return translated.loadedName;
    });
  }

  handleText(chars, state) {
    const font = state.font;
    const glyphs = font.charsToGlyphs(chars);

    if (font.data) {
      const isAddToPathSet = !!(state.textRenderingMode & _util.TextRenderingMode.ADD_TO_PATH_FLAG);

      if (isAddToPathSet || state.fillColorSpace.name === "Pattern" || font.disableFontFace || this.options.disableFontFace) {
        PartialEvaluator.buildFontPaths(font, glyphs, this.handler, this.options);
      }
    }

    return glyphs;
  }

  ensureStateFont(state) {
    if (state.font) {
      return;
    }

    const reason = new _util.FormatError("Missing setFont (Tf) operator before text rendering operator.");

    if (this.options.ignoreErrors) {
      this.handler.send("UnsupportedFeature", {
        featureId: _util.UNSUPPORTED_FEATURES.errorFontState
      });
      (0, _util.warn)(`ensureStateFont: "${reason}".`);
      return;
    }

    throw reason;
  }

  async setGState({
    resources,
    gState,
    operatorList,
    cacheKey,
    task,
    stateManager,
    localGStateCache,
    localColorSpaceCache
  }) {
    const gStateRef = gState.objId;
    let isSimpleGState = true;
    const gStateObj = [];
    const gStateKeys = gState.getKeys();
    let promise = Promise.resolve();

    for (let i = 0, ii = gStateKeys.length; i < ii; i++) {
      const key = gStateKeys[i];
      const value = gState.get(key);

      switch (key) {
        case "Type":
          break;

        case "LW":
        case "LC":
        case "LJ":
        case "ML":
        case "D":
        case "RI":
        case "FL":
        case "CA":
        case "ca":
          gStateObj.push([key, value]);
          break;

        case "Font":
          isSimpleGState = false;
          promise = promise.then(() => {
            return this.handleSetFont(resources, null, value[0], operatorList, task, stateManager.state).then(function (loadedName) {
              operatorList.addDependency(loadedName);
              gStateObj.push([key, [loadedName, value[1]]]);
            });
          });
          break;

        case "BM":
          gStateObj.push([key, normalizeBlendMode(value)]);
          break;

        case "SMask":
          if ((0, _primitives.isName)(value, "None")) {
            gStateObj.push([key, false]);
            break;
          }

          if ((0, _primitives.isDict)(value)) {
            isSimpleGState = false;
            promise = promise.then(() => {
              return this.handleSMask(value, resources, operatorList, task, stateManager, localColorSpaceCache);
            });
            gStateObj.push([key, true]);
          } else {
            (0, _util.warn)("Unsupported SMask type");
          }

          break;

        case "TR":
          const transferMaps = this.handleTransferFunction(value);
          gStateObj.push([key, transferMaps]);
          break;

        case "OP":
        case "op":
        case "OPM":
        case "BG":
        case "BG2":
        case "UCR":
        case "UCR2":
        case "TR2":
        case "HT":
        case "SM":
        case "SA":
        case "AIS":
        case "TK":
          (0, _util.info)("graphic state operator " + key);
          break;

        default:
          (0, _util.info)("Unknown graphic state operator " + key);
          break;
      }
    }

    return promise.then(function () {
      if (gStateObj.length > 0) {
        operatorList.addOp(_util.OPS.setGState, [gStateObj]);
      }

      if (isSimpleGState) {
        localGStateCache.set(cacheKey, gStateRef, gStateObj);
      }
    });
  }

  loadFont(fontName, font, resources, fallbackFontDict = null, cssFontInfo = null) {
    const errorFont = async () => {
      return new TranslatedFont({
        loadedName: "g_font_error",
        font: new _fonts.ErrorFont(`Font "${fontName}" is not available.`),
        dict: font,
        evaluatorOptions: this.options
      });
    };

    const xref = this.xref;
    let fontRef;

    if (font) {
      if (!(0, _primitives.isRef)(font)) {
        throw new _util.FormatError('The "font" object should be a reference.');
      }

      fontRef = font;
    } else {
      const fontRes = resources.get("Font");

      if (fontRes) {
        fontRef = fontRes.getRaw(fontName);
      }
    }

    if (!fontRef) {
      const partialMsg = `Font "${fontName || font && font.toString()}" is not available`;

      if (!this.options.ignoreErrors && !this.parsingType3Font) {
        (0, _util.warn)(`${partialMsg}.`);
        return errorFont();
      }

      this.handler.send("UnsupportedFeature", {
        featureId: _util.UNSUPPORTED_FEATURES.errorFontMissing
      });
      (0, _util.warn)(`${partialMsg} -- attempting to fallback to a default font.`);

      if (fallbackFontDict) {
        fontRef = fallbackFontDict;
      } else {
        fontRef = PartialEvaluator.fallbackFontDict;
      }
    }

    if (this.fontCache.has(fontRef)) {
      return this.fontCache.get(fontRef);
    }

    font = xref.fetchIfRef(fontRef);

    if (!(0, _primitives.isDict)(font)) {
      return errorFont();
    }

    if (font.cacheKey && this.fontCache.has(font.cacheKey)) {
      return this.fontCache.get(font.cacheKey);
    }

    const fontCapability = (0, _util.createPromiseCapability)();
    let preEvaluatedFont;

    try {
      preEvaluatedFont = this.preEvaluateFont(font);
      preEvaluatedFont.cssFontInfo = cssFontInfo;
    } catch (reason) {
      (0, _util.warn)(`loadFont - preEvaluateFont failed: "${reason}".`);
      return errorFont();
    }

    const {
      descriptor,
      hash
    } = preEvaluatedFont;
    const fontRefIsRef = (0, _primitives.isRef)(fontRef);
    let fontID;

    if (fontRefIsRef) {
      fontID = `f${fontRef.toString()}`;
    }

    if (hash && (0, _primitives.isDict)(descriptor)) {
      if (!descriptor.fontAliases) {
        descriptor.fontAliases = Object.create(null);
      }

      const fontAliases = descriptor.fontAliases;

      if (fontAliases[hash]) {
        const aliasFontRef = fontAliases[hash].aliasRef;

        if (fontRefIsRef && aliasFontRef && this.fontCache.has(aliasFontRef)) {
          this.fontCache.putAlias(fontRef, aliasFontRef);
          return this.fontCache.get(fontRef);
        }
      } else {
        fontAliases[hash] = {
          fontID: this.idFactory.createFontId()
        };
      }

      if (fontRefIsRef) {
        fontAliases[hash].aliasRef = fontRef;
      }

      fontID = fontAliases[hash].fontID;
    }

    if (fontRefIsRef) {
      this.fontCache.put(fontRef, fontCapability.promise);
    } else {
      if (!fontID) {
        fontID = this.idFactory.createFontId();
      }

      font.cacheKey = `cacheKey_${fontID}`;
      this.fontCache.put(font.cacheKey, fontCapability.promise);
    }

    (0, _util.assert)(fontID && fontID.startsWith("f"), 'The "fontID" must be (correctly) defined.');
    font.loadedName = `${this.idFactory.getDocId()}_${fontID}`;
    this.translateFont(preEvaluatedFont).then(translatedFont => {
      if (translatedFont.fontType !== undefined) {
        const xrefFontStats = xref.stats.fontTypes;
        xrefFontStats[translatedFont.fontType] = true;
      }

      fontCapability.resolve(new TranslatedFont({
        loadedName: font.loadedName,
        font: translatedFont,
        dict: font,
        evaluatorOptions: this.options
      }));
    }).catch(reason => {
      this.handler.send("UnsupportedFeature", {
        featureId: _util.UNSUPPORTED_FEATURES.errorFontTranslate
      });
      (0, _util.warn)(`loadFont - translateFont failed: "${reason}".`);

      try {
        const fontFile3 = descriptor && descriptor.get("FontFile3");
        const subtype = fontFile3 && fontFile3.get("Subtype");
        const fontType = (0, _fonts_utils.getFontType)(preEvaluatedFont.type, subtype && subtype.name);
        const xrefFontStats = xref.stats.fontTypes;
        xrefFontStats[fontType] = true;
      } catch (ex) {}

      fontCapability.resolve(new TranslatedFont({
        loadedName: font.loadedName,
        font: new _fonts.ErrorFont(reason instanceof Error ? reason.message : reason),
        dict: font,
        evaluatorOptions: this.options
      }));
    });
    return fontCapability.promise;
  }

  buildPath(operatorList, fn, args, parsingText = false) {
    const lastIndex = operatorList.length - 1;

    if (!args) {
      args = [];
    }

    if (lastIndex < 0 || operatorList.fnArray[lastIndex] !== _util.OPS.constructPath) {
      if (parsingText) {
        (0, _util.warn)(`Encountered path operator "${fn}" inside of a text object.`);
        operatorList.addOp(_util.OPS.save, null);
      }

      operatorList.addOp(_util.OPS.constructPath, [[fn], args]);

      if (parsingText) {
        operatorList.addOp(_util.OPS.restore, null);
      }
    } else {
      const opArgs = operatorList.argsArray[lastIndex];
      opArgs[0].push(fn);
      Array.prototype.push.apply(opArgs[1], args);
    }
  }

  parseColorSpace({
    cs,
    resources,
    localColorSpaceCache
  }) {
    return _colorspace.ColorSpace.parseAsync({
      cs,
      xref: this.xref,
      resources,
      pdfFunctionFactory: this._pdfFunctionFactory,
      localColorSpaceCache
    }).catch(reason => {
      if (reason instanceof _util.AbortException) {
        return null;
      }

      if (this.options.ignoreErrors) {
        this.handler.send("UnsupportedFeature", {
          featureId: _util.UNSUPPORTED_FEATURES.errorColorSpace
        });
        (0, _util.warn)(`parseColorSpace - ignoring ColorSpace: "${reason}".`);
        return null;
      }

      throw reason;
    });
  }

  handleColorN(operatorList, fn, args, cs, patterns, resources, task, localColorSpaceCache, localTilingPatternCache) {
    const patternName = args.pop();

    if (patternName instanceof _primitives.Name) {
      const name = patternName.name;
      const localTilingPattern = localTilingPatternCache.getByName(name);

      if (localTilingPattern) {
        try {
          const color = cs.base ? cs.base.getRgb(args, 0) : null;
          const tilingPatternIR = (0, _pattern.getTilingPatternIR)(localTilingPattern.operatorListIR, localTilingPattern.dict, color);
          operatorList.addOp(fn, tilingPatternIR);
          return undefined;
        } catch (ex) {}
      }

      let pattern = patterns.get(name);

      if (pattern) {
        const dict = (0, _primitives.isStream)(pattern) ? pattern.dict : pattern;
        const typeNum = dict.get("PatternType");

        if (typeNum === PatternType.TILING) {
          const color = cs.base ? cs.base.getRgb(args, 0) : null;
          return this.handleTilingType(fn, color, resources, pattern, dict, operatorList, task, name, localTilingPatternCache);
        } else if (typeNum === PatternType.SHADING) {
          const shading = dict.get("Shading");
          const matrix = dict.getArray("Matrix");
          pattern = _pattern.Pattern.parseShading(shading, matrix, this.xref, resources, this.handler, this._pdfFunctionFactory, localColorSpaceCache);
          operatorList.addOp(fn, pattern.getIR());
          return undefined;
        }

        throw new _util.FormatError(`Unknown PatternType: ${typeNum}`);
      }
    }

    throw new _util.FormatError(`Unknown PatternName: ${patternName}`);
  }

  _parseVisibilityExpression(array, nestingCounter, currentResult) {
    const MAX_NESTING = 10;

    if (++nestingCounter > MAX_NESTING) {
      (0, _util.warn)("Visibility expression is too deeply nested");
      return;
    }

    const length = array.length;
    const operator = this.xref.fetchIfRef(array[0]);

    if (length < 2 || !(0, _primitives.isName)(operator)) {
      (0, _util.warn)("Invalid visibility expression");
      return;
    }

    switch (operator.name) {
      case "And":
      case "Or":
      case "Not":
        currentResult.push(operator.name);
        break;

      default:
        (0, _util.warn)(`Invalid operator ${operator.name} in visibility expression`);
        return;
    }

    for (let i = 1; i < length; i++) {
      const raw = array[i];
      const object = this.xref.fetchIfRef(raw);

      if (Array.isArray(object)) {
        const nestedResult = [];
        currentResult.push(nestedResult);

        this._parseVisibilityExpression(object, nestingCounter, nestedResult);
      } else if ((0, _primitives.isRef)(raw)) {
        currentResult.push(raw.toString());
      }
    }
  }

  async parseMarkedContentProps(contentProperties, resources) {
    let optionalContent;

    if ((0, _primitives.isName)(contentProperties)) {
      const properties = resources.get("Properties");
      optionalContent = properties.get(contentProperties.name);
    } else if ((0, _primitives.isDict)(contentProperties)) {
      optionalContent = contentProperties;
    } else {
      throw new _util.FormatError("Optional content properties malformed.");
    }

    const optionalContentType = optionalContent.get("Type").name;

    if (optionalContentType === "OCG") {
      return {
        type: optionalContentType,
        id: optionalContent.objId
      };
    } else if (optionalContentType === "OCMD") {
      const expression = optionalContent.get("VE");

      if (Array.isArray(expression)) {
        const result = [];

        this._parseVisibilityExpression(expression, 0, result);

        if (result.length > 0) {
          return {
            type: "OCMD",
            expression: result
          };
        }
      }

      const optionalContentGroups = optionalContent.get("OCGs");

      if (Array.isArray(optionalContentGroups) || (0, _primitives.isDict)(optionalContentGroups)) {
        const groupIds = [];

        if (Array.isArray(optionalContentGroups)) {
          for (const ocg of optionalContentGroups) {
            groupIds.push(ocg.toString());
          }
        } else {
          groupIds.push(optionalContentGroups.objId);
        }

        return {
          type: optionalContentType,
          ids: groupIds,
          policy: (0, _primitives.isName)(optionalContent.get("P")) ? optionalContent.get("P").name : null,
          expression: null
        };
      } else if ((0, _primitives.isRef)(optionalContentGroups)) {
        return {
          type: optionalContentType,
          id: optionalContentGroups.toString()
        };
      }
    }

    return null;
  }

  getOperatorList({
    stream,
    task,
    resources,
    operatorList,
    initialState = null,
    fallbackFontDict = null
  }) {
    resources = resources || _primitives.Dict.empty;
    initialState = initialState || new EvalState();

    if (!operatorList) {
      throw new Error('getOperatorList: missing "operatorList" parameter');
    }

    const self = this;
    const xref = this.xref;
    let parsingText = false;
    const localImageCache = new _image_utils.LocalImageCache();
    const localColorSpaceCache = new _image_utils.LocalColorSpaceCache();
    const localGStateCache = new _image_utils.LocalGStateCache();
    const localTilingPatternCache = new _image_utils.LocalTilingPatternCache();

    const xobjs = resources.get("XObject") || _primitives.Dict.empty;

    const patterns = resources.get("Pattern") || _primitives.Dict.empty;

    const stateManager = new StateManager(initialState);
    const preprocessor = new EvaluatorPreprocessor(stream, xref, stateManager);
    const timeSlotManager = new TimeSlotManager();

    function closePendingRestoreOPS(argument) {
      for (let i = 0, ii = preprocessor.savedStatesDepth; i < ii; i++) {
        operatorList.addOp(_util.OPS.restore, []);
      }
    }

    return new Promise(function promiseBody(resolve, reject) {
      const next = function (promise) {
        Promise.all([promise, operatorList.ready]).then(function () {
          try {
            promiseBody(resolve, reject);
          } catch (ex) {
            reject(ex);
          }
        }, reject);
      };

      task.ensureNotTerminated();
      timeSlotManager.reset();
      const operation = {};
      let stop, i, ii, cs, name;

      while (!(stop = timeSlotManager.check())) {
        operation.args = null;

        if (!preprocessor.read(operation)) {
          break;
        }

        let args = operation.args;
        let fn = operation.fn;

        switch (fn | 0) {
          case _util.OPS.paintXObject:
            name = args[0].name;

            if (name) {
              const localImage = localImageCache.getByName(name);

              if (localImage) {
                operatorList.addOp(localImage.fn, localImage.args);
                args = null;
                continue;
              }
            }

            next(new Promise(function (resolveXObject, rejectXObject) {
              if (!name) {
                throw new _util.FormatError("XObject must be referred to by name.");
              }

              let xobj = xobjs.getRaw(name);

              if (xobj instanceof _primitives.Ref) {
                const localImage = localImageCache.getByRef(xobj);

                if (localImage) {
                  operatorList.addOp(localImage.fn, localImage.args);
                  resolveXObject();
                  return;
                }

                const globalImage = self.globalImageCache.getData(xobj, self.pageIndex);

                if (globalImage) {
                  operatorList.addDependency(globalImage.objId);
                  operatorList.addOp(globalImage.fn, globalImage.args);
                  resolveXObject();
                  return;
                }

                xobj = xref.fetch(xobj);
              }

              if (!(0, _primitives.isStream)(xobj)) {
                throw new _util.FormatError("XObject should be a stream");
              }

              const type = xobj.dict.get("Subtype");

              if (!(0, _primitives.isName)(type)) {
                throw new _util.FormatError("XObject should have a Name subtype");
              }

              if (type.name === "Form") {
                stateManager.save();
                self.buildFormXObject(resources, xobj, null, operatorList, task, stateManager.state.clone(), localColorSpaceCache).then(function () {
                  stateManager.restore();
                  resolveXObject();
                }, rejectXObject);
                return;
              } else if (type.name === "Image") {
                self.buildPaintImageXObject({
                  resources,
                  image: xobj,
                  operatorList,
                  cacheKey: name,
                  localImageCache,
                  localColorSpaceCache
                }).then(resolveXObject, rejectXObject);
                return;
              } else if (type.name === "PS") {
                (0, _util.info)("Ignored XObject subtype PS");
              } else {
                throw new _util.FormatError(`Unhandled XObject subtype ${type.name}`);
              }

              resolveXObject();
            }).catch(function (reason) {
              if (reason instanceof _util.AbortException) {
                return;
              }

              if (self.options.ignoreErrors) {
                self.handler.send("UnsupportedFeature", {
                  featureId: _util.UNSUPPORTED_FEATURES.errorXObject
                });
                (0, _util.warn)(`getOperatorList - ignoring XObject: "${reason}".`);
                return;
              }

              throw reason;
            }));
            return;

          case _util.OPS.setFont:
            var fontSize = args[1];
            next(self.handleSetFont(resources, args, null, operatorList, task, stateManager.state, fallbackFontDict).then(function (loadedName) {
              operatorList.addDependency(loadedName);
              operatorList.addOp(_util.OPS.setFont, [loadedName, fontSize]);
            }));
            return;

          case _util.OPS.beginText:
            parsingText = true;
            break;

          case _util.OPS.endText:
            parsingText = false;
            break;

          case _util.OPS.endInlineImage:
            var cacheKey = args[0].cacheKey;

            if (cacheKey) {
              const localImage = localImageCache.getByName(cacheKey);

              if (localImage) {
                operatorList.addOp(localImage.fn, localImage.args);
                args = null;
                continue;
              }
            }

            next(self.buildPaintImageXObject({
              resources,
              image: args[0],
              isInline: true,
              operatorList,
              cacheKey,
              localImageCache,
              localColorSpaceCache
            }));
            return;

          case _util.OPS.showText:
            if (!stateManager.state.font) {
              self.ensureStateFont(stateManager.state);
              continue;
            }

            args[0] = self.handleText(args[0], stateManager.state);
            break;

          case _util.OPS.showSpacedText:
            if (!stateManager.state.font) {
              self.ensureStateFont(stateManager.state);
              continue;
            }

            var arr = args[0];
            var combinedGlyphs = [];
            var arrLength = arr.length;
            var state = stateManager.state;

            for (i = 0; i < arrLength; ++i) {
              const arrItem = arr[i];

              if ((0, _util.isString)(arrItem)) {
                Array.prototype.push.apply(combinedGlyphs, self.handleText(arrItem, state));
              } else if ((0, _util.isNum)(arrItem)) {
                combinedGlyphs.push(arrItem);
              }
            }

            args[0] = combinedGlyphs;
            fn = _util.OPS.showText;
            break;

          case _util.OPS.nextLineShowText:
            if (!stateManager.state.font) {
              self.ensureStateFont(stateManager.state);
              continue;
            }

            operatorList.addOp(_util.OPS.nextLine);
            args[0] = self.handleText(args[0], stateManager.state);
            fn = _util.OPS.showText;
            break;

          case _util.OPS.nextLineSetSpacingShowText:
            if (!stateManager.state.font) {
              self.ensureStateFont(stateManager.state);
              continue;
            }

            operatorList.addOp(_util.OPS.nextLine);
            operatorList.addOp(_util.OPS.setWordSpacing, [args.shift()]);
            operatorList.addOp(_util.OPS.setCharSpacing, [args.shift()]);
            args[0] = self.handleText(args[0], stateManager.state);
            fn = _util.OPS.showText;
            break;

          case _util.OPS.setTextRenderingMode:
            stateManager.state.textRenderingMode = args[0];
            break;

          case _util.OPS.setFillColorSpace:
            {
              const cachedColorSpace = _colorspace.ColorSpace.getCached(args[0], xref, localColorSpaceCache);

              if (cachedColorSpace) {
                stateManager.state.fillColorSpace = cachedColorSpace;
                continue;
              }

              next(self.parseColorSpace({
                cs: args[0],
                resources,
                localColorSpaceCache
              }).then(function (colorSpace) {
                if (colorSpace) {
                  stateManager.state.fillColorSpace = colorSpace;
                }
              }));
              return;
            }

          case _util.OPS.setStrokeColorSpace:
            {
              const cachedColorSpace = _colorspace.ColorSpace.getCached(args[0], xref, localColorSpaceCache);

              if (cachedColorSpace) {
                stateManager.state.strokeColorSpace = cachedColorSpace;
                continue;
              }

              next(self.parseColorSpace({
                cs: args[0],
                resources,
                localColorSpaceCache
              }).then(function (colorSpace) {
                if (colorSpace) {
                  stateManager.state.strokeColorSpace = colorSpace;
                }
              }));
              return;
            }

          case _util.OPS.setFillColor:
            cs = stateManager.state.fillColorSpace;
            args = cs.getRgb(args, 0);
            fn = _util.OPS.setFillRGBColor;
            break;

          case _util.OPS.setStrokeColor:
            cs = stateManager.state.strokeColorSpace;
            args = cs.getRgb(args, 0);
            fn = _util.OPS.setStrokeRGBColor;
            break;

          case _util.OPS.setFillGray:
            stateManager.state.fillColorSpace = _colorspace.ColorSpace.singletons.gray;
            args = _colorspace.ColorSpace.singletons.gray.getRgb(args, 0);
            fn = _util.OPS.setFillRGBColor;
            break;

          case _util.OPS.setStrokeGray:
            stateManager.state.strokeColorSpace = _colorspace.ColorSpace.singletons.gray;
            args = _colorspace.ColorSpace.singletons.gray.getRgb(args, 0);
            fn = _util.OPS.setStrokeRGBColor;
            break;

          case _util.OPS.setFillCMYKColor:
            stateManager.state.fillColorSpace = _colorspace.ColorSpace.singletons.cmyk;
            args = _colorspace.ColorSpace.singletons.cmyk.getRgb(args, 0);
            fn = _util.OPS.setFillRGBColor;
            break;

          case _util.OPS.setStrokeCMYKColor:
            stateManager.state.strokeColorSpace = _colorspace.ColorSpace.singletons.cmyk;
            args = _colorspace.ColorSpace.singletons.cmyk.getRgb(args, 0);
            fn = _util.OPS.setStrokeRGBColor;
            break;

          case _util.OPS.setFillRGBColor:
            stateManager.state.fillColorSpace = _colorspace.ColorSpace.singletons.rgb;
            args = _colorspace.ColorSpace.singletons.rgb.getRgb(args, 0);
            break;

          case _util.OPS.setStrokeRGBColor:
            stateManager.state.strokeColorSpace = _colorspace.ColorSpace.singletons.rgb;
            args = _colorspace.ColorSpace.singletons.rgb.getRgb(args, 0);
            break;

          case _util.OPS.setFillColorN:
            cs = stateManager.state.fillColorSpace;

            if (cs.name === "Pattern") {
              next(self.handleColorN(operatorList, _util.OPS.setFillColorN, args, cs, patterns, resources, task, localColorSpaceCache, localTilingPatternCache));
              return;
            }

            args = cs.getRgb(args, 0);
            fn = _util.OPS.setFillRGBColor;
            break;

          case _util.OPS.setStrokeColorN:
            cs = stateManager.state.strokeColorSpace;

            if (cs.name === "Pattern") {
              next(self.handleColorN(operatorList, _util.OPS.setStrokeColorN, args, cs, patterns, resources, task, localColorSpaceCache, localTilingPatternCache));
              return;
            }

            args = cs.getRgb(args, 0);
            fn = _util.OPS.setStrokeRGBColor;
            break;

          case _util.OPS.shadingFill:
            var shadingRes = resources.get("Shading");

            if (!shadingRes) {
              throw new _util.FormatError("No shading resource found");
            }

            var shading = shadingRes.get(args[0].name);

            if (!shading) {
              throw new _util.FormatError("No shading object found");
            }

            var shadingFill = _pattern.Pattern.parseShading(shading, null, xref, resources, self.handler, self._pdfFunctionFactory, localColorSpaceCache);

            var patternIR = shadingFill.getIR();
            args = [patternIR];
            fn = _util.OPS.shadingFill;
            break;

          case _util.OPS.setGState:
            name = args[0].name;

            if (name) {
              const localGStateObj = localGStateCache.getByName(name);

              if (localGStateObj) {
                if (localGStateObj.length > 0) {
                  operatorList.addOp(_util.OPS.setGState, [localGStateObj]);
                }

                args = null;
                continue;
              }
            }

            next(new Promise(function (resolveGState, rejectGState) {
              if (!name) {
                throw new _util.FormatError("GState must be referred to by name.");
              }

              const extGState = resources.get("ExtGState");

              if (!(extGState instanceof _primitives.Dict)) {
                throw new _util.FormatError("ExtGState should be a dictionary.");
              }

              const gState = extGState.get(name);

              if (!(gState instanceof _primitives.Dict)) {
                throw new _util.FormatError("GState should be a dictionary.");
              }

              self.setGState({
                resources,
                gState,
                operatorList,
                cacheKey: name,
                task,
                stateManager,
                localGStateCache,
                localColorSpaceCache
              }).then(resolveGState, rejectGState);
            }).catch(function (reason) {
              if (reason instanceof _util.AbortException) {
                return;
              }

              if (self.options.ignoreErrors) {
                self.handler.send("UnsupportedFeature", {
                  featureId: _util.UNSUPPORTED_FEATURES.errorExtGState
                });
                (0, _util.warn)(`getOperatorList - ignoring ExtGState: "${reason}".`);
                return;
              }

              throw reason;
            }));
            return;

          case _util.OPS.moveTo:
          case _util.OPS.lineTo:
          case _util.OPS.curveTo:
          case _util.OPS.curveTo2:
          case _util.OPS.curveTo3:
          case _util.OPS.closePath:
          case _util.OPS.rectangle:
            self.buildPath(operatorList, fn, args, parsingText);
            continue;

          case _util.OPS.markPoint:
          case _util.OPS.markPointProps:
          case _util.OPS.beginCompat:
          case _util.OPS.endCompat:
            continue;

          case _util.OPS.beginMarkedContentProps:
            if (!(0, _primitives.isName)(args[0])) {
              (0, _util.warn)(`Expected name for beginMarkedContentProps arg0=${args[0]}`);
              continue;
            }

            if (args[0].name === "OC") {
              next(self.parseMarkedContentProps(args[1], resources).then(data => {
                operatorList.addOp(_util.OPS.beginMarkedContentProps, ["OC", data]);
              }).catch(reason => {
                if (reason instanceof _util.AbortException) {
                  return;
                }

                if (self.options.ignoreErrors) {
                  self.handler.send("UnsupportedFeature", {
                    featureId: _util.UNSUPPORTED_FEATURES.errorMarkedContent
                  });
                  (0, _util.warn)(`getOperatorList - ignoring beginMarkedContentProps: "${reason}".`);
                  return;
                }

                throw reason;
              }));
              return;
            }

            args = [args[0].name, args[1] instanceof _primitives.Dict ? args[1].get("MCID") : null];
            break;

          case _util.OPS.beginMarkedContent:
          case _util.OPS.endMarkedContent:
          default:
            if (args !== null) {
              for (i = 0, ii = args.length; i < ii; i++) {
                if (args[i] instanceof _primitives.Dict) {
                  break;
                }
              }

              if (i < ii) {
                (0, _util.warn)("getOperatorList - ignoring operator: " + fn);
                continue;
              }
            }

        }

        operatorList.addOp(fn, args);
      }

      if (stop) {
        next(deferred);
        return;
      }

      closePendingRestoreOPS();
      resolve();
    }).catch(reason => {
      if (reason instanceof _util.AbortException) {
        return;
      }

      if (this.options.ignoreErrors) {
        this.handler.send("UnsupportedFeature", {
          featureId: _util.UNSUPPORTED_FEATURES.errorOperatorList
        });
        (0, _util.warn)(`getOperatorList - ignoring errors during "${task.name}" ` + `task: "${reason}".`);
        closePendingRestoreOPS();
        return;
      }

      throw reason;
    });
  }

  getTextContent({
    stream,
    task,
    resources,
    stateManager = null,
    normalizeWhitespace = false,
    combineTextItems = false,
    includeMarkedContent = false,
    sink,
    seenStyles = new Set()
  }) {
    resources = resources || _primitives.Dict.empty;
    stateManager = stateManager || new StateManager(new TextState());
    const WhitespaceRegexp = /\s/g;
    const textContent = {
      items: [],
      styles: Object.create(null)
    };
    const textContentItem = {
      initialized: false,
      str: [],
      totalWidth: 0,
      totalHeight: 0,
      width: 0,
      height: 0,
      vertical: false,
      lastCharSize: 0,
      prevTransform: null,
      textAdvanceScale: 0,
      spaceWidth: 0,
      spaceInFlowMin: 0,
      spaceInFlowMax: 0,
      trackingSpaceMin: Infinity,
      transform: null,
      fontName: null,
      hasEOL: false,
      isLastCharWhiteSpace: false
    };
    const TRACKING_SPACE_FACTOR = 0.3;
    const SPACE_IN_FLOW_MIN_FACTOR = 0.3;
    const SPACE_IN_FLOW_MAX_FACTOR = 1.3;
    const self = this;
    const xref = this.xref;
    const showSpacedTextBuffer = [];
    let xobjs = null;
    const emptyXObjectCache = new _image_utils.LocalImageCache();
    const emptyGStateCache = new _image_utils.LocalGStateCache();
    const preprocessor = new EvaluatorPreprocessor(stream, xref, stateManager);
    let textState;

    function getCurrentTextTransform() {
      const font = textState.font;
      const tsm = [textState.fontSize * textState.textHScale, 0, 0, textState.fontSize, 0, textState.textRise];

      if (font.isType3Font && textState.fontSize <= 1 && !(0, _util.isArrayEqual)(textState.fontMatrix, _util.FONT_IDENTITY_MATRIX)) {
        const glyphHeight = font.bbox[3] - font.bbox[1];

        if (glyphHeight > 0) {
          tsm[3] *= glyphHeight * textState.fontMatrix[3];
        }
      }

      return _util.Util.transform(textState.ctm, _util.Util.transform(textState.textMatrix, tsm));
    }

    function ensureTextContentItem() {
      if (textContentItem.initialized) {
        return textContentItem;
      }

      const font = textState.font,
            loadedName = font.loadedName;

      if (!seenStyles.has(loadedName)) {
        seenStyles.add(loadedName);
        textContent.styles[loadedName] = {
          fontFamily: font.fallbackName,
          ascent: font.ascent,
          descent: font.descent,
          vertical: font.vertical
        };
      }

      textContentItem.fontName = loadedName;
      const trm = textContentItem.transform = getCurrentTextTransform();

      if (!font.vertical) {
        textContentItem.width = textContentItem.totalWidth = 0;
        textContentItem.height = textContentItem.totalHeight = Math.hypot(trm[2], trm[3]);
        textContentItem.vertical = false;
      } else {
        textContentItem.width = textContentItem.totalWidth = Math.hypot(trm[0], trm[1]);
        textContentItem.height = textContentItem.totalHeight = 0;
        textContentItem.vertical = true;
      }

      const scaleLineX = Math.hypot(textState.textLineMatrix[0], textState.textLineMatrix[1]);
      const scaleCtmX = Math.hypot(textState.ctm[0], textState.ctm[1]);
      textContentItem.textAdvanceScale = scaleCtmX * scaleLineX;
      textContentItem.lastCharSize = textContentItem.lastCharSize || 0;
      const spaceWidth = font.spaceWidth / 1000 * textState.fontSize;

      if (spaceWidth) {
        textContentItem.spaceWidth = spaceWidth;
        textContentItem.trackingSpaceMin = spaceWidth * TRACKING_SPACE_FACTOR;
        textContentItem.spaceInFlowMin = spaceWidth * SPACE_IN_FLOW_MIN_FACTOR;
        textContentItem.spaceInFlowMax = spaceWidth * SPACE_IN_FLOW_MAX_FACTOR;
      } else {
        textContentItem.spaceWidth = 0;
        textContentItem.trackingSpaceMin = Infinity;
      }

      textContentItem.hasEOL = false;
      textContentItem.initialized = true;
      return textContentItem;
    }

    function updateAdvanceScale() {
      if (!textContentItem.initialized) {
        return;
      }

      const scaleLineX = Math.hypot(textState.textLineMatrix[0], textState.textLineMatrix[1]);
      const scaleCtmX = Math.hypot(textState.ctm[0], textState.ctm[1]);
      const scaleFactor = scaleCtmX * scaleLineX;

      if (scaleFactor === textContentItem.textAdvanceScale) {
        return;
      }

      if (!textContentItem.vertical) {
        textContentItem.totalWidth += textContentItem.width * textContentItem.textAdvanceScale;
        textContentItem.width = 0;
      } else {
        textContentItem.totalHeight += textContentItem.height * textContentItem.textAdvanceScale;
        textContentItem.height = 0;
      }

      textContentItem.textAdvanceScale = scaleFactor;
    }

    function replaceWhitespace(str) {
      const ii = str.length;
      let i = 0,
          code;

      while (i < ii && (code = str.charCodeAt(i)) >= 0x20 && code <= 0x7f) {
        i++;
      }

      return i < ii ? str.replace(WhitespaceRegexp, " ") : str;
    }

    function runBidiTransform(textChunk) {
      const text = textChunk.str.join("");
      const bidiResult = (0, _bidi.bidi)(text, -1, textChunk.vertical);
      const str = normalizeWhitespace ? replaceWhitespace(bidiResult.str) : bidiResult.str;
      return {
        str,
        dir: bidiResult.dir,
        width: textChunk.totalWidth,
        height: textChunk.totalHeight,
        transform: textChunk.transform,
        fontName: textChunk.fontName,
        hasEOL: textChunk.hasEOL
      };
    }

    function handleSetFont(fontName, fontRef) {
      return self.loadFont(fontName, fontRef, resources).then(function (translated) {
        textState.font = translated.font;
        textState.fontMatrix = translated.font.fontMatrix || _util.FONT_IDENTITY_MATRIX;
      });
    }

    function compareWithLastPosition(fontSize) {
      if (!combineTextItems || !textState.font || !textContentItem.prevTransform) {
        return;
      }

      const currentTransform = getCurrentTextTransform();
      const posX = currentTransform[4];
      const posY = currentTransform[5];
      const lastPosX = textContentItem.prevTransform[4];
      const lastPosY = textContentItem.prevTransform[5];

      if (lastPosX === posX && lastPosY === posY) {
        return;
      }

      const advanceX = (posX - lastPosX) / textContentItem.textAdvanceScale;
      const advanceY = (posY - lastPosY) / textContentItem.textAdvanceScale;
      const HALF_LAST_CHAR = -0.5 * textContentItem.lastCharSize;

      if (textState.font.vertical) {
        if (Math.abs(advanceX) > textContentItem.width / textContentItem.textAdvanceScale) {
          appendEOL();
          return;
        }

        if (HALF_LAST_CHAR > advanceY) {
          return;
        }

        if (advanceY > textContentItem.trackingSpaceMin) {
          textContentItem.height += advanceY;
        } else if (!addFakeSpaces(advanceY, 0, textContentItem.prevTransform)) {
          if (textContentItem.str.length === 0) {
            textContent.items.push({
              str: " ",
              dir: "ltr",
              width: 0,
              height: advanceY,
              transform: textContentItem.prevTransform,
              fontName: textContentItem.fontName,
              hasEOL: false
            });
            textContentItem.isLastCharWhiteSpace = true;
          } else {
            textContentItem.height += advanceY;
          }
        }

        return;
      }

      if (Math.abs(advanceY) > textContentItem.height / textContentItem.textAdvanceScale) {
        appendEOL();
        return;
      }

      if (HALF_LAST_CHAR > advanceX) {
        return;
      }

      if (advanceX <= textContentItem.trackingSpaceMin) {
        textContentItem.width += advanceX;
      } else if (!addFakeSpaces(advanceX, 0, textContentItem.prevTransform)) {
        if (textContentItem.str.length === 0) {
          textContent.items.push({
            str: " ",
            dir: "ltr",
            width: advanceX,
            height: 0,
            transform: textContentItem.prevTransform,
            fontName: textContentItem.fontName,
            hasEOL: false
          });
          textContentItem.isLastCharWhiteSpace = true;
        } else {
          textContentItem.width += advanceX;
        }
      }
    }

    function buildTextContentItem({
      chars,
      extraSpacing,
      isFirstChunk
    }) {
      const font = textState.font;

      if (!chars) {
        const charSpacing = textState.charSpacing + extraSpacing;

        if (charSpacing) {
          if (!font.vertical) {
            textState.translateTextMatrix(charSpacing * textState.textHScale, 0);
          } else {
            textState.translateTextMatrix(0, charSpacing);
          }
        }

        return;
      }

      const NormalizedUnicodes = (0, _unicode.getNormalizedUnicodes)();
      const glyphs = font.charsToGlyphs(chars);
      const scale = textState.fontMatrix[0] * textState.fontSize;

      if (isFirstChunk) {
        compareWithLastPosition(scale);
      }

      let textChunk = ensureTextContentItem();
      let size = 0;
      let lastCharSize = 0;

      for (let i = 0, ii = glyphs.length; i < ii; i++) {
        const glyph = glyphs[i];
        let charSpacing = textState.charSpacing + (i === ii - 1 ? extraSpacing : 0);
        let glyphUnicode = glyph.unicode;

        if (glyph.isSpace) {
          charSpacing += textState.wordSpacing;
          textChunk.isLastCharWhiteSpace = true;
        } else {
          glyphUnicode = NormalizedUnicodes[glyphUnicode] || glyphUnicode;
          glyphUnicode = (0, _unicode.reverseIfRtl)(glyphUnicode);
          textChunk.isLastCharWhiteSpace = false;
        }

        textChunk.str.push(glyphUnicode);
        const glyphWidth = font.vertical && glyph.vmetric ? glyph.vmetric[0] : glyph.width;
        let scaledDim = glyphWidth * scale;

        if (!font.vertical) {
          scaledDim *= textState.textHScale;
          textState.translateTextMatrix(scaledDim, 0);
        } else {
          textState.translateTextMatrix(0, scaledDim);
          scaledDim = Math.abs(scaledDim);
        }

        size += scaledDim;

        if (charSpacing) {
          if (!font.vertical) {
            charSpacing *= textState.textHScale;
          }

          scaledDim += charSpacing;
          const wasSplit = charSpacing > textContentItem.trackingSpaceMin && addFakeSpaces(charSpacing, size);

          if (!font.vertical) {
            textState.translateTextMatrix(charSpacing, 0);
          } else {
            textState.translateTextMatrix(0, charSpacing);
          }

          if (wasSplit) {
            textChunk = ensureTextContentItem();
            size = 0;
          } else {
            size += charSpacing;
          }
        }

        lastCharSize = scaledDim;
      }

      textChunk.lastCharSize = lastCharSize;

      if (!font.vertical) {
        textChunk.width += size;
      } else {
        textChunk.height += size;
      }

      textChunk.prevTransform = getCurrentTextTransform();
    }

    function appendEOL() {
      if (textContentItem.initialized) {
        textContentItem.hasEOL = true;
        flushTextContentItem();
      } else if (textContent.items.length > 0) {
        textContent.items[textContent.items.length - 1].hasEOL = true;
      } else {
        textContent.items.push({
          str: "",
          dir: "ltr",
          width: 0,
          height: 0,
          transform: getCurrentTextTransform(),
          fontName: textState.font.loadedName,
          hasEOL: true
        });
      }

      textContentItem.isLastCharWhiteSpace = false;
      textContentItem.lastCharSize = 0;
    }

    function addFakeSpaces(width, size, transf = null) {
      if (textContentItem.spaceInFlowMin <= width && width <= textContentItem.spaceInFlowMax) {
        if (textContentItem.initialized) {
          textContentItem.str.push(" ");
          textContentItem.isLastCharWhiteSpace = true;
        }

        return false;
      }

      const fontName = textContentItem.fontName;
      let height = 0;
      width *= textContentItem.textAdvanceScale;

      if (!textContentItem.vertical) {
        textContentItem.width += size;
      } else {
        textContentItem.height += size;
        height = width;
        width = 0;
      }

      flushTextContentItem();

      if (textContentItem.isLastCharWhiteSpace) {
        return true;
      }

      textContentItem.isLastCharWhiteSpace = true;
      textContent.items.push({
        str: " ",
        dir: "ltr",
        width,
        height,
        transform: transf ? transf : getCurrentTextTransform(),
        fontName,
        hasEOL: false
      });
      return true;
    }

    function flushTextContentItem() {
      if (!textContentItem.initialized || !textContentItem.str) {
        return;
      }

      if (!textContentItem.vertical) {
        textContentItem.totalWidth += textContentItem.width * textContentItem.textAdvanceScale;
      } else {
        textContentItem.totalHeight += textContentItem.height * textContentItem.textAdvanceScale;
      }

      textContent.items.push(runBidiTransform(textContentItem));
      textContentItem.initialized = false;
      textContentItem.str.length = 0;
    }

    function enqueueChunk() {
      const length = textContent.items.length;

      if (length > 0) {
        sink.enqueue(textContent, length);
        textContent.items = [];
        textContent.styles = Object.create(null);
      }
    }

    const timeSlotManager = new TimeSlotManager();
    return new Promise(function promiseBody(resolve, reject) {
      const next = function (promise) {
        enqueueChunk();
        Promise.all([promise, sink.ready]).then(function () {
          try {
            promiseBody(resolve, reject);
          } catch (ex) {
            reject(ex);
          }
        }, reject);
      };

      task.ensureNotTerminated();
      timeSlotManager.reset();
      const operation = {};
      let stop,
          args = [];

      while (!(stop = timeSlotManager.check())) {
        args.length = 0;
        operation.args = args;

        if (!preprocessor.read(operation)) {
          break;
        }

        textState = stateManager.state;
        const fn = operation.fn;
        args = operation.args;

        switch (fn | 0) {
          case _util.OPS.setFont:
            var fontNameArg = args[0].name,
                fontSizeArg = args[1];

            if (textState.font && fontNameArg === textState.fontName && fontSizeArg === textState.fontSize) {
              break;
            }

            flushTextContentItem();
            textState.fontName = fontNameArg;
            textState.fontSize = fontSizeArg;
            next(handleSetFont(fontNameArg, null));
            return;

          case _util.OPS.setTextRise:
            flushTextContentItem();
            textState.textRise = args[0];
            break;

          case _util.OPS.setHScale:
            flushTextContentItem();
            textState.textHScale = args[0] / 100;
            break;

          case _util.OPS.setLeading:
            flushTextContentItem();
            textState.leading = args[0];
            break;

          case _util.OPS.moveText:
            textState.translateTextLineMatrix(args[0], args[1]);
            textState.textMatrix = textState.textLineMatrix.slice();
            break;

          case _util.OPS.setLeadingMoveText:
            flushTextContentItem();
            textState.leading = -args[1];
            textState.translateTextLineMatrix(args[0], args[1]);
            textState.textMatrix = textState.textLineMatrix.slice();
            break;

          case _util.OPS.nextLine:
            appendEOL();
            textState.carriageReturn();
            break;

          case _util.OPS.setTextMatrix:
            textState.setTextMatrix(args[0], args[1], args[2], args[3], args[4], args[5]);
            textState.setTextLineMatrix(args[0], args[1], args[2], args[3], args[4], args[5]);
            updateAdvanceScale();
            break;

          case _util.OPS.setCharSpacing:
            textState.charSpacing = args[0];
            break;

          case _util.OPS.setWordSpacing:
            textState.wordSpacing = args[0];
            break;

          case _util.OPS.beginText:
            flushTextContentItem();
            textState.textMatrix = _util.IDENTITY_MATRIX.slice();
            textState.textLineMatrix = _util.IDENTITY_MATRIX.slice();
            break;

          case _util.OPS.showSpacedText:
            if (!stateManager.state.font) {
              self.ensureStateFont(stateManager.state);
              continue;
            }

            const spaceFactor = (textState.font.vertical ? 1 : -1) * textState.fontSize / 1000;
            const elements = args[0];
            let isFirstChunk = true;

            for (let i = 0, ii = elements.length; i < ii - 1; i++) {
              const item = elements[i];

              if (typeof item === "string") {
                showSpacedTextBuffer.push(item);
              } else if (typeof item === "number" && item !== 0) {
                const str = showSpacedTextBuffer.join("");
                showSpacedTextBuffer.length = 0;
                buildTextContentItem({
                  chars: str,
                  extraSpacing: item * spaceFactor,
                  isFirstChunk
                });

                if (str && isFirstChunk) {
                  isFirstChunk = false;
                }
              }
            }

            const item = elements[elements.length - 1];

            if (typeof item === "string") {
              showSpacedTextBuffer.push(item);
            }

            if (showSpacedTextBuffer.length > 0) {
              const str = showSpacedTextBuffer.join("");
              showSpacedTextBuffer.length = 0;
              buildTextContentItem({
                chars: str,
                extraSpacing: 0,
                isFirstChunk
              });
            }

            break;

          case _util.OPS.showText:
            if (!stateManager.state.font) {
              self.ensureStateFont(stateManager.state);
              continue;
            }

            buildTextContentItem({
              chars: args[0],
              extraSpacing: 0,
              isFirstChunk: true
            });
            break;

          case _util.OPS.nextLineShowText:
            if (!stateManager.state.font) {
              self.ensureStateFont(stateManager.state);
              continue;
            }

            textContentItem.hasEOL = true;
            flushTextContentItem();
            textState.carriageReturn();
            buildTextContentItem({
              chars: args[0],
              extraSpacing: 0,
              isFirstChunk: true
            });
            break;

          case _util.OPS.nextLineSetSpacingShowText:
            if (!stateManager.state.font) {
              self.ensureStateFont(stateManager.state);
              continue;
            }

            textContentItem.hasEOL = true;
            flushTextContentItem();
            textState.wordSpacing = args[0];
            textState.charSpacing = args[1];
            textState.carriageReturn();
            buildTextContentItem({
              chars: args[2],
              extraSpacing: 0,
              isFirstChunk: true
            });
            break;

          case _util.OPS.paintXObject:
            flushTextContentItem();

            if (!xobjs) {
              xobjs = resources.get("XObject") || _primitives.Dict.empty;
            }

            var name = args[0].name;

            if (name && emptyXObjectCache.getByName(name)) {
              break;
            }

            next(new Promise(function (resolveXObject, rejectXObject) {
              if (!name) {
                throw new _util.FormatError("XObject must be referred to by name.");
              }

              let xobj = xobjs.getRaw(name);

              if (xobj instanceof _primitives.Ref) {
                if (emptyXObjectCache.getByRef(xobj)) {
                  resolveXObject();
                  return;
                }

                const globalImage = self.globalImageCache.getData(xobj, self.pageIndex);

                if (globalImage) {
                  resolveXObject();
                  return;
                }

                xobj = xref.fetch(xobj);
              }

              if (!(0, _primitives.isStream)(xobj)) {
                throw new _util.FormatError("XObject should be a stream");
              }

              const type = xobj.dict.get("Subtype");

              if (!(0, _primitives.isName)(type)) {
                throw new _util.FormatError("XObject should have a Name subtype");
              }

              if (type.name !== "Form") {
                emptyXObjectCache.set(name, xobj.dict.objId, true);
                resolveXObject();
                return;
              }

              const currentState = stateManager.state.clone();
              const xObjStateManager = new StateManager(currentState);
              const matrix = xobj.dict.getArray("Matrix");

              if (Array.isArray(matrix) && matrix.length === 6) {
                xObjStateManager.transform(matrix);
              }

              enqueueChunk();
              const sinkWrapper = {
                enqueueInvoked: false,

                enqueue(chunk, size) {
                  this.enqueueInvoked = true;
                  sink.enqueue(chunk, size);
                },

                get desiredSize() {
                  return sink.desiredSize;
                },

                get ready() {
                  return sink.ready;
                }

              };
              self.getTextContent({
                stream: xobj,
                task,
                resources: xobj.dict.get("Resources") || resources,
                stateManager: xObjStateManager,
                normalizeWhitespace,
                combineTextItems,
                includeMarkedContent,
                sink: sinkWrapper,
                seenStyles
              }).then(function () {
                if (!sinkWrapper.enqueueInvoked) {
                  emptyXObjectCache.set(name, xobj.dict.objId, true);
                }

                resolveXObject();
              }, rejectXObject);
            }).catch(function (reason) {
              if (reason instanceof _util.AbortException) {
                return;
              }

              if (self.options.ignoreErrors) {
                (0, _util.warn)(`getTextContent - ignoring XObject: "${reason}".`);
                return;
              }

              throw reason;
            }));
            return;

          case _util.OPS.setGState:
            name = args[0].name;

            if (name && emptyGStateCache.getByName(name)) {
              break;
            }

            next(new Promise(function (resolveGState, rejectGState) {
              if (!name) {
                throw new _util.FormatError("GState must be referred to by name.");
              }

              const extGState = resources.get("ExtGState");

              if (!(extGState instanceof _primitives.Dict)) {
                throw new _util.FormatError("ExtGState should be a dictionary.");
              }

              const gState = extGState.get(name);

              if (!(gState instanceof _primitives.Dict)) {
                throw new _util.FormatError("GState should be a dictionary.");
              }

              const gStateFont = gState.get("Font");

              if (!gStateFont) {
                emptyGStateCache.set(name, gState.objId, true);
                resolveGState();
                return;
              }

              flushTextContentItem();
              textState.fontName = null;
              textState.fontSize = gStateFont[1];
              handleSetFont(null, gStateFont[0]).then(resolveGState, rejectGState);
            }).catch(function (reason) {
              if (reason instanceof _util.AbortException) {
                return;
              }

              if (self.options.ignoreErrors) {
                (0, _util.warn)(`getTextContent - ignoring ExtGState: "${reason}".`);
                return;
              }

              throw reason;
            }));
            return;

          case _util.OPS.beginMarkedContent:
            if (includeMarkedContent) {
              textContent.items.push({
                type: "beginMarkedContent",
                tag: (0, _primitives.isName)(args[0]) ? args[0].name : null
              });
            }

            break;

          case _util.OPS.beginMarkedContentProps:
            if (includeMarkedContent) {
              flushTextContentItem();
              let mcid = null;

              if ((0, _primitives.isDict)(args[1])) {
                mcid = args[1].get("MCID");
              }

              textContent.items.push({
                type: "beginMarkedContentProps",
                id: Number.isInteger(mcid) ? `${self.idFactory.getPageObjId()}_mcid${mcid}` : null,
                tag: (0, _primitives.isName)(args[0]) ? args[0].name : null
              });
            }

            break;

          case _util.OPS.endMarkedContent:
            if (includeMarkedContent) {
              flushTextContentItem();
              textContent.items.push({
                type: "endMarkedContent"
              });
            }

            break;
        }

        if (textContent.items.length >= sink.desiredSize) {
          stop = true;
          break;
        }
      }

      if (stop) {
        next(deferred);
        return;
      }

      flushTextContentItem();
      enqueueChunk();
      resolve();
    }).catch(reason => {
      if (reason instanceof _util.AbortException) {
        return;
      }

      if (this.options.ignoreErrors) {
        (0, _util.warn)(`getTextContent - ignoring errors during "${task.name}" ` + `task: "${reason}".`);
        flushTextContentItem();
        enqueueChunk();
        return;
      }

      throw reason;
    });
  }

  extractDataStructures(dict, baseDict, properties) {
    const xref = this.xref;
    let cidToGidBytes;
    const toUnicodePromise = this.readToUnicode(properties.toUnicode || dict.get("ToUnicode") || baseDict.get("ToUnicode"));

    if (properties.composite) {
      const cidSystemInfo = dict.get("CIDSystemInfo");

      if ((0, _primitives.isDict)(cidSystemInfo)) {
        properties.cidSystemInfo = {
          registry: (0, _util.stringToPDFString)(cidSystemInfo.get("Registry")),
          ordering: (0, _util.stringToPDFString)(cidSystemInfo.get("Ordering")),
          supplement: cidSystemInfo.get("Supplement")
        };
      }

      const cidToGidMap = dict.get("CIDToGIDMap");

      if ((0, _primitives.isStream)(cidToGidMap)) {
        cidToGidBytes = cidToGidMap.getBytes();
      }
    }

    const differences = [];
    let baseEncodingName = null;
    let encoding;

    if (dict.has("Encoding")) {
      encoding = dict.get("Encoding");

      if ((0, _primitives.isDict)(encoding)) {
        baseEncodingName = encoding.get("BaseEncoding");
        baseEncodingName = (0, _primitives.isName)(baseEncodingName) ? baseEncodingName.name : null;

        if (encoding.has("Differences")) {
          const diffEncoding = encoding.get("Differences");
          let index = 0;

          for (let j = 0, jj = diffEncoding.length; j < jj; j++) {
            const data = xref.fetchIfRef(diffEncoding[j]);

            if ((0, _util.isNum)(data)) {
              index = data;
            } else if ((0, _primitives.isName)(data)) {
              differences[index++] = data.name;
            } else {
              throw new _util.FormatError(`Invalid entry in 'Differences' array: ${data}`);
            }
          }
        }
      } else if ((0, _primitives.isName)(encoding)) {
        baseEncodingName = encoding.name;
      } else {
        throw new _util.FormatError("Encoding is not a Name nor a Dict");
      }

      if (baseEncodingName !== "MacRomanEncoding" && baseEncodingName !== "MacExpertEncoding" && baseEncodingName !== "WinAnsiEncoding") {
        baseEncodingName = null;
      }
    }

    if (baseEncodingName) {
      properties.defaultEncoding = (0, _encodings.getEncoding)(baseEncodingName);
    } else {
      const isSymbolicFont = !!(properties.flags & _fonts_utils.FontFlags.Symbolic);
      const isNonsymbolicFont = !!(properties.flags & _fonts_utils.FontFlags.Nonsymbolic);
      encoding = _encodings.StandardEncoding;

      if (properties.type === "TrueType" && !isNonsymbolicFont) {
        encoding = _encodings.WinAnsiEncoding;
      }

      if (isSymbolicFont) {
        encoding = _encodings.MacRomanEncoding;

        if (!properties.file) {
          if (/Symbol/i.test(properties.name)) {
            encoding = _encodings.SymbolSetEncoding;
          } else if (/Dingbats|Wingdings/i.test(properties.name)) {
            encoding = _encodings.ZapfDingbatsEncoding;
          }
        }
      }

      properties.defaultEncoding = encoding;
    }

    properties.differences = differences;
    properties.baseEncodingName = baseEncodingName;
    properties.hasEncoding = !!baseEncodingName || differences.length > 0;
    properties.dict = dict;
    return toUnicodePromise.then(readToUnicode => {
      properties.toUnicode = readToUnicode;
      return this.buildToUnicode(properties);
    }).then(builtToUnicode => {
      properties.toUnicode = builtToUnicode;

      if (cidToGidBytes) {
        properties.cidToGidMap = this.readCidToGidMap(cidToGidBytes, builtToUnicode);
      }

      return properties;
    });
  }

  _buildSimpleFontToUnicode(properties, forceGlyphs = false) {
    (0, _util.assert)(!properties.composite, "Must be a simple font.");
    const toUnicode = [];
    const encoding = properties.defaultEncoding.slice();
    const baseEncodingName = properties.baseEncodingName;
    const differences = properties.differences;

    for (const charcode in differences) {
      const glyphName = differences[charcode];

      if (glyphName === ".notdef") {
        continue;
      }

      encoding[charcode] = glyphName;
    }

    const glyphsUnicodeMap = (0, _glyphlist.getGlyphsUnicode)();

    for (const charcode in encoding) {
      let glyphName = encoding[charcode];

      if (glyphName === "") {
        continue;
      } else if (glyphsUnicodeMap[glyphName] === undefined) {
        let code = 0;

        switch (glyphName[0]) {
          case "G":
            if (glyphName.length === 3) {
              code = parseInt(glyphName.substring(1), 16);
            }

            break;

          case "g":
            if (glyphName.length === 5) {
              code = parseInt(glyphName.substring(1), 16);
            }

            break;

          case "C":
          case "c":
            if (glyphName.length >= 3 && glyphName.length <= 4) {
              const codeStr = glyphName.substring(1);

              if (forceGlyphs) {
                code = parseInt(codeStr, 16);
                break;
              }

              code = +codeStr;

              if (Number.isNaN(code) && Number.isInteger(parseInt(codeStr, 16))) {
                return this._buildSimpleFontToUnicode(properties, true);
              }
            }

            break;

          default:
            const unicode = (0, _unicode.getUnicodeForGlyph)(glyphName, glyphsUnicodeMap);

            if (unicode !== -1) {
              code = unicode;
            }

        }

        if (code > 0 && code <= 0x10ffff && Number.isInteger(code)) {
          if (baseEncodingName && code === +charcode) {
            const baseEncoding = (0, _encodings.getEncoding)(baseEncodingName);

            if (baseEncoding && (glyphName = baseEncoding[charcode])) {
              toUnicode[charcode] = String.fromCharCode(glyphsUnicodeMap[glyphName]);
              continue;
            }
          }

          toUnicode[charcode] = String.fromCodePoint(code);
        }

        continue;
      }

      toUnicode[charcode] = String.fromCharCode(glyphsUnicodeMap[glyphName]);
    }

    return new _to_unicode_map.ToUnicodeMap(toUnicode);
  }

  buildToUnicode(properties) {
    properties.hasIncludedToUnicodeMap = !!properties.toUnicode && properties.toUnicode.length > 0;

    if (properties.hasIncludedToUnicodeMap) {
      if (!properties.composite && properties.hasEncoding) {
        properties.fallbackToUnicode = this._buildSimpleFontToUnicode(properties);
      }

      return Promise.resolve(properties.toUnicode);
    }

    if (!properties.composite) {
      return Promise.resolve(this._buildSimpleFontToUnicode(properties));
    }

    if (properties.composite && (properties.cMap.builtInCMap && !(properties.cMap instanceof _cmap.IdentityCMap) || properties.cidSystemInfo.registry === "Adobe" && (properties.cidSystemInfo.ordering === "GB1" || properties.cidSystemInfo.ordering === "CNS1" || properties.cidSystemInfo.ordering === "Japan1" || properties.cidSystemInfo.ordering === "Korea1"))) {
      const registry = properties.cidSystemInfo.registry;
      const ordering = properties.cidSystemInfo.ordering;

      const ucs2CMapName = _primitives.Name.get(registry + "-" + ordering + "-UCS2");

      return _cmap.CMapFactory.create({
        encoding: ucs2CMapName,
        fetchBuiltInCMap: this._fetchBuiltInCMapBound,
        useCMap: null
      }).then(function (ucs2CMap) {
        const cMap = properties.cMap;
        const toUnicode = [];
        cMap.forEach(function (charcode, cid) {
          if (cid > 0xffff) {
            throw new _util.FormatError("Max size of CID is 65,535");
          }

          const ucs2 = ucs2CMap.lookup(cid);

          if (ucs2) {
            toUnicode[charcode] = String.fromCharCode((ucs2.charCodeAt(0) << 8) + ucs2.charCodeAt(1));
          }
        });
        return new _to_unicode_map.ToUnicodeMap(toUnicode);
      });
    }

    return Promise.resolve(new _to_unicode_map.IdentityToUnicodeMap(properties.firstChar, properties.lastChar));
  }

  readToUnicode(cmapObj) {
    if (!cmapObj) {
      return Promise.resolve(null);
    }

    if ((0, _primitives.isName)(cmapObj)) {
      return _cmap.CMapFactory.create({
        encoding: cmapObj,
        fetchBuiltInCMap: this._fetchBuiltInCMapBound,
        useCMap: null
      }).then(function (cmap) {
        if (cmap instanceof _cmap.IdentityCMap) {
          return new _to_unicode_map.IdentityToUnicodeMap(0, 0xffff);
        }

        return new _to_unicode_map.ToUnicodeMap(cmap.getMap());
      });
    } else if ((0, _primitives.isStream)(cmapObj)) {
      return _cmap.CMapFactory.create({
        encoding: cmapObj,
        fetchBuiltInCMap: this._fetchBuiltInCMapBound,
        useCMap: null
      }).then(function (cmap) {
        if (cmap instanceof _cmap.IdentityCMap) {
          return new _to_unicode_map.IdentityToUnicodeMap(0, 0xffff);
        }

        const map = new Array(cmap.length);
        cmap.forEach(function (charCode, token) {
          const str = [];

          for (let k = 0; k < token.length; k += 2) {
            const w1 = token.charCodeAt(k) << 8 | token.charCodeAt(k + 1);

            if ((w1 & 0xf800) !== 0xd800) {
              str.push(w1);
              continue;
            }

            k += 2;
            const w2 = token.charCodeAt(k) << 8 | token.charCodeAt(k + 1);
            str.push(((w1 & 0x3ff) << 10) + (w2 & 0x3ff) + 0x10000);
          }

          map[charCode] = String.fromCodePoint.apply(String, str);
        });
        return new _to_unicode_map.ToUnicodeMap(map);
      }, reason => {
        if (reason instanceof _util.AbortException) {
          return null;
        }

        if (this.options.ignoreErrors) {
          this.handler.send("UnsupportedFeature", {
            featureId: _util.UNSUPPORTED_FEATURES.errorFontToUnicode
          });
          (0, _util.warn)(`readToUnicode - ignoring ToUnicode data: "${reason}".`);
          return null;
        }

        throw reason;
      });
    }

    return Promise.resolve(null);
  }

  readCidToGidMap(glyphsData, toUnicode) {
    const result = [];

    for (let j = 0, jj = glyphsData.length; j < jj; j++) {
      const glyphID = glyphsData[j++] << 8 | glyphsData[j];
      const code = j >> 1;

      if (glyphID === 0 && !toUnicode.has(code)) {
        continue;
      }

      result[code] = glyphID;
    }

    return result;
  }

  extractWidths(dict, descriptor, properties) {
    const xref = this.xref;
    let glyphsWidths = [];
    let defaultWidth = 0;
    const glyphsVMetrics = [];
    let defaultVMetrics;
    let i, ii, j, jj, start, code, widths;

    if (properties.composite) {
      defaultWidth = dict.has("DW") ? dict.get("DW") : 1000;
      widths = dict.get("W");

      if (widths) {
        for (i = 0, ii = widths.length; i < ii; i++) {
          start = xref.fetchIfRef(widths[i++]);
          code = xref.fetchIfRef(widths[i]);

          if (Array.isArray(code)) {
            for (j = 0, jj = code.length; j < jj; j++) {
              glyphsWidths[start++] = xref.fetchIfRef(code[j]);
            }
          } else {
            const width = xref.fetchIfRef(widths[++i]);

            for (j = start; j <= code; j++) {
              glyphsWidths[j] = width;
            }
          }
        }
      }

      if (properties.vertical) {
        let vmetrics = dict.getArray("DW2") || [880, -1000];
        defaultVMetrics = [vmetrics[1], defaultWidth * 0.5, vmetrics[0]];
        vmetrics = dict.get("W2");

        if (vmetrics) {
          for (i = 0, ii = vmetrics.length; i < ii; i++) {
            start = xref.fetchIfRef(vmetrics[i++]);
            code = xref.fetchIfRef(vmetrics[i]);

            if (Array.isArray(code)) {
              for (j = 0, jj = code.length; j < jj; j++) {
                glyphsVMetrics[start++] = [xref.fetchIfRef(code[j++]), xref.fetchIfRef(code[j++]), xref.fetchIfRef(code[j])];
              }
            } else {
              const vmetric = [xref.fetchIfRef(vmetrics[++i]), xref.fetchIfRef(vmetrics[++i]), xref.fetchIfRef(vmetrics[++i])];

              for (j = start; j <= code; j++) {
                glyphsVMetrics[j] = vmetric;
              }
            }
          }
        }
      }
    } else {
      const firstChar = properties.firstChar;
      widths = dict.get("Widths");

      if (widths) {
        j = firstChar;

        for (i = 0, ii = widths.length; i < ii; i++) {
          glyphsWidths[j++] = xref.fetchIfRef(widths[i]);
        }

        defaultWidth = parseFloat(descriptor.get("MissingWidth")) || 0;
      } else {
        const baseFontName = dict.get("BaseFont");

        if ((0, _primitives.isName)(baseFontName)) {
          const metrics = this.getBaseFontMetrics(baseFontName.name);
          glyphsWidths = this.buildCharCodeToWidth(metrics.widths, properties);
          defaultWidth = metrics.defaultWidth;
        }
      }
    }

    let isMonospace = true;
    let firstWidth = defaultWidth;

    for (const glyph in glyphsWidths) {
      const glyphWidth = glyphsWidths[glyph];

      if (!glyphWidth) {
        continue;
      }

      if (!firstWidth) {
        firstWidth = glyphWidth;
        continue;
      }

      if (firstWidth !== glyphWidth) {
        isMonospace = false;
        break;
      }
    }

    if (isMonospace) {
      properties.flags |= _fonts_utils.FontFlags.FixedPitch;
    }

    properties.defaultWidth = defaultWidth;
    properties.widths = glyphsWidths;
    properties.defaultVMetrics = defaultVMetrics;
    properties.vmetrics = glyphsVMetrics;
  }

  isSerifFont(baseFontName) {
    const fontNameWoStyle = baseFontName.split("-")[0];
    return fontNameWoStyle in (0, _standard_fonts.getSerifFonts)() || fontNameWoStyle.search(/serif/gi) !== -1;
  }

  getBaseFontMetrics(name) {
    let defaultWidth = 0;
    let widths = Object.create(null);
    let monospace = false;
    const stdFontMap = (0, _standard_fonts.getStdFontMap)();
    let lookupName = stdFontMap[name] || name;
    const Metrics = (0, _metrics.getMetrics)();

    if (!(lookupName in Metrics)) {
      if (this.isSerifFont(name)) {
        lookupName = "Times-Roman";
      } else {
        lookupName = "Helvetica";
      }
    }

    const glyphWidths = Metrics[lookupName];

    if ((0, _util.isNum)(glyphWidths)) {
      defaultWidth = glyphWidths;
      monospace = true;
    } else {
      widths = glyphWidths();
    }

    return {
      defaultWidth,
      monospace,
      widths
    };
  }

  buildCharCodeToWidth(widthsByGlyphName, properties) {
    const widths = Object.create(null);
    const differences = properties.differences;
    const encoding = properties.defaultEncoding;

    for (let charCode = 0; charCode < 256; charCode++) {
      if (charCode in differences && widthsByGlyphName[differences[charCode]]) {
        widths[charCode] = widthsByGlyphName[differences[charCode]];
        continue;
      }

      if (charCode in encoding && widthsByGlyphName[encoding[charCode]]) {
        widths[charCode] = widthsByGlyphName[encoding[charCode]];
        continue;
      }
    }

    return widths;
  }

  preEvaluateFont(dict) {
    const baseDict = dict;
    let type = dict.get("Subtype");

    if (!(0, _primitives.isName)(type)) {
      throw new _util.FormatError("invalid font Subtype");
    }

    let composite = false;
    let hash, toUnicode;

    if (type.name === "Type0") {
      const df = dict.get("DescendantFonts");

      if (!df) {
        throw new _util.FormatError("Descendant fonts are not specified");
      }

      dict = Array.isArray(df) ? this.xref.fetchIfRef(df[0]) : df;

      if (!(dict instanceof _primitives.Dict)) {
        throw new _util.FormatError("Descendant font is not a dictionary.");
      }

      type = dict.get("Subtype");

      if (!(0, _primitives.isName)(type)) {
        throw new _util.FormatError("invalid font Subtype");
      }

      composite = true;
    }

    const firstChar = dict.get("FirstChar") || 0,
          lastChar = dict.get("LastChar") || (composite ? 0xffff : 0xff);
    const descriptor = dict.get("FontDescriptor");

    if (descriptor) {
      hash = new _murmurhash.MurmurHash3_64();
      const encoding = baseDict.getRaw("Encoding");

      if ((0, _primitives.isName)(encoding)) {
        hash.update(encoding.name);
      } else if ((0, _primitives.isRef)(encoding)) {
        hash.update(encoding.toString());
      } else if ((0, _primitives.isDict)(encoding)) {
        for (const entry of encoding.getRawValues()) {
          if ((0, _primitives.isName)(entry)) {
            hash.update(entry.name);
          } else if ((0, _primitives.isRef)(entry)) {
            hash.update(entry.toString());
          } else if (Array.isArray(entry)) {
            const diffLength = entry.length,
                  diffBuf = new Array(diffLength);

            for (let j = 0; j < diffLength; j++) {
              const diffEntry = entry[j];

              if ((0, _primitives.isName)(diffEntry)) {
                diffBuf[j] = diffEntry.name;
              } else if ((0, _util.isNum)(diffEntry) || (0, _primitives.isRef)(diffEntry)) {
                diffBuf[j] = diffEntry.toString();
              }
            }

            hash.update(diffBuf.join());
          }
        }
      }

      hash.update(`${firstChar}-${lastChar}`);
      toUnicode = dict.get("ToUnicode") || baseDict.get("ToUnicode");

      if ((0, _primitives.isStream)(toUnicode)) {
        const stream = toUnicode.str || toUnicode;
        const uint8array = stream.buffer ? new Uint8Array(stream.buffer.buffer, 0, stream.bufferLength) : new Uint8Array(stream.bytes.buffer, stream.start, stream.end - stream.start);
        hash.update(uint8array);
      } else if ((0, _primitives.isName)(toUnicode)) {
        hash.update(toUnicode.name);
      }

      const widths = dict.get("Widths") || baseDict.get("Widths");

      if (Array.isArray(widths)) {
        const widthsBuf = [];

        for (const entry of widths) {
          if ((0, _util.isNum)(entry) || (0, _primitives.isRef)(entry)) {
            widthsBuf.push(entry.toString());
          }
        }

        hash.update(widthsBuf.join());
      }

      if (composite) {
        hash.update("compositeFont");
        const compositeWidths = dict.get("W") || baseDict.get("W");

        if (Array.isArray(compositeWidths)) {
          const widthsBuf = [];

          for (const entry of compositeWidths) {
            if ((0, _util.isNum)(entry) || (0, _primitives.isRef)(entry)) {
              widthsBuf.push(entry.toString());
            } else if (Array.isArray(entry)) {
              const subWidthsBuf = [];

              for (const element of entry) {
                if ((0, _util.isNum)(element) || (0, _primitives.isRef)(element)) {
                  subWidthsBuf.push(element.toString());
                }
              }

              widthsBuf.push(`[${subWidthsBuf.join()}]`);
            }
          }

          hash.update(widthsBuf.join());
        }
      }
    }

    return {
      descriptor,
      dict,
      baseDict,
      composite,
      type: type.name,
      firstChar,
      lastChar,
      toUnicode,
      hash: hash ? hash.hexdigest() : ""
    };
  }

  async translateFont({
    descriptor,
    dict,
    baseDict,
    composite,
    type,
    firstChar,
    lastChar,
    toUnicode,
    cssFontInfo
  }) {
    const isType3Font = type === "Type3";
    let properties;

    if (!descriptor) {
      if (isType3Font) {
        descriptor = new _primitives.Dict(null);
        descriptor.set("FontName", _primitives.Name.get(type));
        descriptor.set("FontBBox", dict.getArray("FontBBox") || [0, 0, 0, 0]);
      } else {
        let baseFontName = dict.get("BaseFont");

        if (!(0, _primitives.isName)(baseFontName)) {
          throw new _util.FormatError("Base font is not specified");
        }

        baseFontName = baseFontName.name.replace(/[,_]/g, "-");
        const metrics = this.getBaseFontMetrics(baseFontName);
        const fontNameWoStyle = baseFontName.split("-")[0];
        const flags = (this.isSerifFont(fontNameWoStyle) ? _fonts_utils.FontFlags.Serif : 0) | (metrics.monospace ? _fonts_utils.FontFlags.FixedPitch : 0) | ((0, _standard_fonts.getSymbolsFonts)()[fontNameWoStyle] ? _fonts_utils.FontFlags.Symbolic : _fonts_utils.FontFlags.Nonsymbolic);
        properties = {
          type,
          name: baseFontName,
          widths: metrics.widths,
          defaultWidth: metrics.defaultWidth,
          flags,
          firstChar,
          lastChar,
          toUnicode,
          isType3Font
        };
        const widths = dict.get("Widths");
        return this.extractDataStructures(dict, dict, properties).then(newProperties => {
          if (widths) {
            const glyphWidths = [];
            let j = firstChar;

            for (let i = 0, ii = widths.length; i < ii; i++) {
              glyphWidths[j++] = this.xref.fetchIfRef(widths[i]);
            }

            newProperties.widths = glyphWidths;
          } else {
            newProperties.widths = this.buildCharCodeToWidth(metrics.widths, newProperties);
          }

          return new _fonts.Font(baseFontName, null, newProperties);
        });
      }
    }

    let fontName = descriptor.get("FontName");
    let baseFont = dict.get("BaseFont");

    if ((0, _util.isString)(fontName)) {
      fontName = _primitives.Name.get(fontName);
    }

    if ((0, _util.isString)(baseFont)) {
      baseFont = _primitives.Name.get(baseFont);
    }

    if (!isType3Font) {
      const fontNameStr = fontName && fontName.name;
      const baseFontStr = baseFont && baseFont.name;

      if (fontNameStr !== baseFontStr) {
        (0, _util.info)(`The FontDescriptor's FontName is "${fontNameStr}" but ` + `should be the same as the Font's BaseFont "${baseFontStr}".`);

        if (fontNameStr && baseFontStr && baseFontStr.startsWith(fontNameStr)) {
          fontName = baseFont;
        }
      }
    }

    fontName = fontName || baseFont;

    if (!(0, _primitives.isName)(fontName)) {
      throw new _util.FormatError("invalid font name");
    }

    let fontFile, subtype, length1, length2, length3;

    try {
      fontFile = descriptor.get("FontFile", "FontFile2", "FontFile3");
    } catch (ex) {
      if (!this.options.ignoreErrors) {
        throw ex;
      }

      (0, _util.warn)(`translateFont - fetching "${fontName.name}" font file: "${ex}".`);
      fontFile = new _stream.NullStream();
    }

    if (fontFile) {
      if (fontFile.dict) {
        const subtypeEntry = fontFile.dict.get("Subtype");

        if (subtypeEntry instanceof _primitives.Name) {
          subtype = subtypeEntry.name;
        }

        length1 = fontFile.dict.get("Length1");
        length2 = fontFile.dict.get("Length2");
        length3 = fontFile.dict.get("Length3");
      }
    }

    properties = {
      type,
      name: fontName.name,
      subtype,
      file: fontFile,
      length1,
      length2,
      length3,
      loadedName: baseDict.loadedName,
      composite,
      fixedPitch: false,
      fontMatrix: dict.getArray("FontMatrix") || _util.FONT_IDENTITY_MATRIX,
      firstChar,
      lastChar,
      toUnicode,
      bbox: descriptor.getArray("FontBBox"),
      ascent: descriptor.get("Ascent"),
      descent: descriptor.get("Descent"),
      xHeight: descriptor.get("XHeight"),
      capHeight: descriptor.get("CapHeight"),
      flags: descriptor.get("Flags"),
      italicAngle: descriptor.get("ItalicAngle"),
      isType3Font,
      cssFontInfo
    };

    if (composite) {
      const cidEncoding = baseDict.get("Encoding");

      if ((0, _primitives.isName)(cidEncoding)) {
        properties.cidEncoding = cidEncoding.name;
      }

      const cMap = await _cmap.CMapFactory.create({
        encoding: cidEncoding,
        fetchBuiltInCMap: this._fetchBuiltInCMapBound,
        useCMap: null
      });
      properties.cMap = cMap;
      properties.vertical = properties.cMap.vertical;
    }

    return this.extractDataStructures(dict, baseDict, properties).then(newProperties => {
      this.extractWidths(dict, descriptor, newProperties);
      return new _fonts.Font(fontName.name, fontFile, newProperties);
    });
  }

  static buildFontPaths(font, glyphs, handler, evaluatorOptions) {
    function buildPath(fontChar) {
      const glyphName = `${font.loadedName}_path_${fontChar}`;

      try {
        if (font.renderer.hasBuiltPath(fontChar)) {
          return;
        }

        handler.send("commonobj", [glyphName, "FontPath", font.renderer.getPathJs(fontChar)]);
      } catch (reason) {
        if (evaluatorOptions.ignoreErrors) {
          handler.send("UnsupportedFeature", {
            featureId: _util.UNSUPPORTED_FEATURES.errorFontBuildPath
          });
          (0, _util.warn)(`buildFontPaths - ignoring ${glyphName} glyph: "${reason}".`);
          return;
        }

        throw reason;
      }
    }

    for (const glyph of glyphs) {
      buildPath(glyph.fontChar);
      const accent = glyph.accent;

      if (accent && accent.fontChar) {
        buildPath(accent.fontChar);
      }
    }
  }

  static get fallbackFontDict() {
    const dict = new _primitives.Dict();
    dict.set("BaseFont", _primitives.Name.get("PDFJS-FallbackFont"));
    dict.set("Type", _primitives.Name.get("FallbackType"));
    dict.set("Subtype", _primitives.Name.get("FallbackType"));
    dict.set("Encoding", _primitives.Name.get("WinAnsiEncoding"));
    return (0, _util.shadow)(this, "fallbackFontDict", dict);
  }

}

exports.PartialEvaluator = PartialEvaluator;

class TranslatedFont {
  constructor({
    loadedName,
    font,
    dict,
    evaluatorOptions
  }) {
    this.loadedName = loadedName;
    this.font = font;
    this.dict = dict;
    this._evaluatorOptions = evaluatorOptions || DefaultPartialEvaluatorOptions;
    this.type3Loaded = null;
    this.type3Dependencies = font.isType3Font ? new Set() : null;
    this.sent = false;
  }

  send(handler) {
    if (this.sent) {
      return;
    }

    this.sent = true;
    handler.send("commonobj", [this.loadedName, "Font", this.font.exportData(this._evaluatorOptions.fontExtraProperties)]);
  }

  fallback(handler) {
    if (!this.font.data) {
      return;
    }

    this.font.disableFontFace = true;
    PartialEvaluator.buildFontPaths(this.font, this.font.glyphCacheValues, handler, this._evaluatorOptions);
  }

  loadType3Data(evaluator, resources, task) {
    if (this.type3Loaded) {
      return this.type3Loaded;
    }

    if (!this.font.isType3Font) {
      throw new Error("Must be a Type3 font.");
    }

    const type3Options = Object.create(evaluator.options);
    type3Options.ignoreErrors = false;
    const type3Evaluator = evaluator.clone(type3Options);
    type3Evaluator.parsingType3Font = true;
    const translatedFont = this.font,
          type3Dependencies = this.type3Dependencies;
    let loadCharProcsPromise = Promise.resolve();
    const charProcs = this.dict.get("CharProcs");
    const fontResources = this.dict.get("Resources") || resources;
    const charProcOperatorList = Object.create(null);

    for (const key of charProcs.getKeys()) {
      loadCharProcsPromise = loadCharProcsPromise.then(() => {
        const glyphStream = charProcs.get(key);
        const operatorList = new _operator_list.OperatorList();
        return type3Evaluator.getOperatorList({
          stream: glyphStream,
          task,
          resources: fontResources,
          operatorList
        }).then(() => {
          if (operatorList.fnArray[0] === _util.OPS.setCharWidthAndBounds) {
            this._removeType3ColorOperators(operatorList);
          }

          charProcOperatorList[key] = operatorList.getIR();

          for (const dependency of operatorList.dependencies) {
            type3Dependencies.add(dependency);
          }
        }).catch(function (reason) {
          (0, _util.warn)(`Type3 font resource "${key}" is not available.`);
          const dummyOperatorList = new _operator_list.OperatorList();
          charProcOperatorList[key] = dummyOperatorList.getIR();
        });
      });
    }

    this.type3Loaded = loadCharProcsPromise.then(function () {
      translatedFont.charProcOperatorList = charProcOperatorList;
    });
    return this.type3Loaded;
  }

  _removeType3ColorOperators(operatorList) {
    let i = 1,
        ii = operatorList.length;

    while (i < ii) {
      switch (operatorList.fnArray[i]) {
        case _util.OPS.setStrokeColorSpace:
        case _util.OPS.setFillColorSpace:
        case _util.OPS.setStrokeColor:
        case _util.OPS.setStrokeColorN:
        case _util.OPS.setFillColor:
        case _util.OPS.setFillColorN:
        case _util.OPS.setStrokeGray:
        case _util.OPS.setFillGray:
        case _util.OPS.setStrokeRGBColor:
        case _util.OPS.setFillRGBColor:
        case _util.OPS.setStrokeCMYKColor:
        case _util.OPS.setFillCMYKColor:
        case _util.OPS.shadingFill:
        case _util.OPS.setRenderingIntent:
          operatorList.fnArray.splice(i, 1);
          operatorList.argsArray.splice(i, 1);
          ii--;
          continue;

        case _util.OPS.setGState:
          const [gStateObj] = operatorList.argsArray[i];
          let j = 0,
              jj = gStateObj.length;

          while (j < jj) {
            const [gStateKey] = gStateObj[j];

            switch (gStateKey) {
              case "TR":
              case "TR2":
              case "HT":
              case "BG":
              case "BG2":
              case "UCR":
              case "UCR2":
                gStateObj.splice(j, 1);
                jj--;
                continue;
            }

            j++;
          }

          break;
      }

      i++;
    }
  }

}

class StateManager {
  constructor(initialState = new EvalState()) {
    this.state = initialState;
    this.stateStack = [];
  }

  save() {
    const old = this.state;
    this.stateStack.push(this.state);
    this.state = old.clone();
  }

  restore() {
    const prev = this.stateStack.pop();

    if (prev) {
      this.state = prev;
    }
  }

  transform(args) {
    this.state.ctm = _util.Util.transform(this.state.ctm, args);
  }

}

class TextState {
  constructor() {
    this.ctm = new Float32Array(_util.IDENTITY_MATRIX);
    this.fontName = null;
    this.fontSize = 0;
    this.font = null;
    this.fontMatrix = _util.FONT_IDENTITY_MATRIX;
    this.textMatrix = _util.IDENTITY_MATRIX.slice();
    this.textLineMatrix = _util.IDENTITY_MATRIX.slice();
    this.charSpacing = 0;
    this.wordSpacing = 0;
    this.leading = 0;
    this.textHScale = 1;
    this.textRise = 0;
  }

  setTextMatrix(a, b, c, d, e, f) {
    const m = this.textMatrix;
    m[0] = a;
    m[1] = b;
    m[2] = c;
    m[3] = d;
    m[4] = e;
    m[5] = f;
  }

  setTextLineMatrix(a, b, c, d, e, f) {
    const m = this.textLineMatrix;
    m[0] = a;
    m[1] = b;
    m[2] = c;
    m[3] = d;
    m[4] = e;
    m[5] = f;
  }

  translateTextMatrix(x, y) {
    const m = this.textMatrix;
    m[4] = m[0] * x + m[2] * y + m[4];
    m[5] = m[1] * x + m[3] * y + m[5];
  }

  translateTextLineMatrix(x, y) {
    const m = this.textLineMatrix;
    m[4] = m[0] * x + m[2] * y + m[4];
    m[5] = m[1] * x + m[3] * y + m[5];
  }

  carriageReturn() {
    this.translateTextLineMatrix(0, -this.leading);
    this.textMatrix = this.textLineMatrix.slice();
  }

  clone() {
    const clone = Object.create(this);
    clone.textMatrix = this.textMatrix.slice();
    clone.textLineMatrix = this.textLineMatrix.slice();
    clone.fontMatrix = this.fontMatrix.slice();
    return clone;
  }

}

class EvalState {
  constructor() {
    this.ctm = new Float32Array(_util.IDENTITY_MATRIX);
    this.font = null;
    this.textRenderingMode = _util.TextRenderingMode.FILL;
    this.fillColorSpace = _colorspace.ColorSpace.singletons.gray;
    this.strokeColorSpace = _colorspace.ColorSpace.singletons.gray;
  }

  clone() {
    return Object.create(this);
  }

}

class EvaluatorPreprocessor {
  static get opMap() {
    const getOPMap = (0, _core_utils.getLookupTableFactory)(function (t) {
      t.w = {
        id: _util.OPS.setLineWidth,
        numArgs: 1,
        variableArgs: false
      };
      t.J = {
        id: _util.OPS.setLineCap,
        numArgs: 1,
        variableArgs: false
      };
      t.j = {
        id: _util.OPS.setLineJoin,
        numArgs: 1,
        variableArgs: false
      };
      t.M = {
        id: _util.OPS.setMiterLimit,
        numArgs: 1,
        variableArgs: false
      };
      t.d = {
        id: _util.OPS.setDash,
        numArgs: 2,
        variableArgs: false
      };
      t.ri = {
        id: _util.OPS.setRenderingIntent,
        numArgs: 1,
        variableArgs: false
      };
      t.i = {
        id: _util.OPS.setFlatness,
        numArgs: 1,
        variableArgs: false
      };
      t.gs = {
        id: _util.OPS.setGState,
        numArgs: 1,
        variableArgs: false
      };
      t.q = {
        id: _util.OPS.save,
        numArgs: 0,
        variableArgs: false
      };
      t.Q = {
        id: _util.OPS.restore,
        numArgs: 0,
        variableArgs: false
      };
      t.cm = {
        id: _util.OPS.transform,
        numArgs: 6,
        variableArgs: false
      };
      t.m = {
        id: _util.OPS.moveTo,
        numArgs: 2,
        variableArgs: false
      };
      t.l = {
        id: _util.OPS.lineTo,
        numArgs: 2,
        variableArgs: false
      };
      t.c = {
        id: _util.OPS.curveTo,
        numArgs: 6,
        variableArgs: false
      };
      t.v = {
        id: _util.OPS.curveTo2,
        numArgs: 4,
        variableArgs: false
      };
      t.y = {
        id: _util.OPS.curveTo3,
        numArgs: 4,
        variableArgs: false
      };
      t.h = {
        id: _util.OPS.closePath,
        numArgs: 0,
        variableArgs: false
      };
      t.re = {
        id: _util.OPS.rectangle,
        numArgs: 4,
        variableArgs: false
      };
      t.S = {
        id: _util.OPS.stroke,
        numArgs: 0,
        variableArgs: false
      };
      t.s = {
        id: _util.OPS.closeStroke,
        numArgs: 0,
        variableArgs: false
      };
      t.f = {
        id: _util.OPS.fill,
        numArgs: 0,
        variableArgs: false
      };
      t.F = {
        id: _util.OPS.fill,
        numArgs: 0,
        variableArgs: false
      };
      t["f*"] = {
        id: _util.OPS.eoFill,
        numArgs: 0,
        variableArgs: false
      };
      t.B = {
        id: _util.OPS.fillStroke,
        numArgs: 0,
        variableArgs: false
      };
      t["B*"] = {
        id: _util.OPS.eoFillStroke,
        numArgs: 0,
        variableArgs: false
      };
      t.b = {
        id: _util.OPS.closeFillStroke,
        numArgs: 0,
        variableArgs: false
      };
      t["b*"] = {
        id: _util.OPS.closeEOFillStroke,
        numArgs: 0,
        variableArgs: false
      };
      t.n = {
        id: _util.OPS.endPath,
        numArgs: 0,
        variableArgs: false
      };
      t.W = {
        id: _util.OPS.clip,
        numArgs: 0,
        variableArgs: false
      };
      t["W*"] = {
        id: _util.OPS.eoClip,
        numArgs: 0,
        variableArgs: false
      };
      t.BT = {
        id: _util.OPS.beginText,
        numArgs: 0,
        variableArgs: false
      };
      t.ET = {
        id: _util.OPS.endText,
        numArgs: 0,
        variableArgs: false
      };
      t.Tc = {
        id: _util.OPS.setCharSpacing,
        numArgs: 1,
        variableArgs: false
      };
      t.Tw = {
        id: _util.OPS.setWordSpacing,
        numArgs: 1,
        variableArgs: false
      };
      t.Tz = {
        id: _util.OPS.setHScale,
        numArgs: 1,
        variableArgs: false
      };
      t.TL = {
        id: _util.OPS.setLeading,
        numArgs: 1,
        variableArgs: false
      };
      t.Tf = {
        id: _util.OPS.setFont,
        numArgs: 2,
        variableArgs: false
      };
      t.Tr = {
        id: _util.OPS.setTextRenderingMode,
        numArgs: 1,
        variableArgs: false
      };
      t.Ts = {
        id: _util.OPS.setTextRise,
        numArgs: 1,
        variableArgs: false
      };
      t.Td = {
        id: _util.OPS.moveText,
        numArgs: 2,
        variableArgs: false
      };
      t.TD = {
        id: _util.OPS.setLeadingMoveText,
        numArgs: 2,
        variableArgs: false
      };
      t.Tm = {
        id: _util.OPS.setTextMatrix,
        numArgs: 6,
        variableArgs: false
      };
      t["T*"] = {
        id: _util.OPS.nextLine,
        numArgs: 0,
        variableArgs: false
      };
      t.Tj = {
        id: _util.OPS.showText,
        numArgs: 1,
        variableArgs: false
      };
      t.TJ = {
        id: _util.OPS.showSpacedText,
        numArgs: 1,
        variableArgs: false
      };
      t["'"] = {
        id: _util.OPS.nextLineShowText,
        numArgs: 1,
        variableArgs: false
      };
      t['"'] = {
        id: _util.OPS.nextLineSetSpacingShowText,
        numArgs: 3,
        variableArgs: false
      };
      t.d0 = {
        id: _util.OPS.setCharWidth,
        numArgs: 2,
        variableArgs: false
      };
      t.d1 = {
        id: _util.OPS.setCharWidthAndBounds,
        numArgs: 6,
        variableArgs: false
      };
      t.CS = {
        id: _util.OPS.setStrokeColorSpace,
        numArgs: 1,
        variableArgs: false
      };
      t.cs = {
        id: _util.OPS.setFillColorSpace,
        numArgs: 1,
        variableArgs: false
      };
      t.SC = {
        id: _util.OPS.setStrokeColor,
        numArgs: 4,
        variableArgs: true
      };
      t.SCN = {
        id: _util.OPS.setStrokeColorN,
        numArgs: 33,
        variableArgs: true
      };
      t.sc = {
        id: _util.OPS.setFillColor,
        numArgs: 4,
        variableArgs: true
      };
      t.scn = {
        id: _util.OPS.setFillColorN,
        numArgs: 33,
        variableArgs: true
      };
      t.G = {
        id: _util.OPS.setStrokeGray,
        numArgs: 1,
        variableArgs: false
      };
      t.g = {
        id: _util.OPS.setFillGray,
        numArgs: 1,
        variableArgs: false
      };
      t.RG = {
        id: _util.OPS.setStrokeRGBColor,
        numArgs: 3,
        variableArgs: false
      };
      t.rg = {
        id: _util.OPS.setFillRGBColor,
        numArgs: 3,
        variableArgs: false
      };
      t.K = {
        id: _util.OPS.setStrokeCMYKColor,
        numArgs: 4,
        variableArgs: false
      };
      t.k = {
        id: _util.OPS.setFillCMYKColor,
        numArgs: 4,
        variableArgs: false
      };
      t.sh = {
        id: _util.OPS.shadingFill,
        numArgs: 1,
        variableArgs: false
      };
      t.BI = {
        id: _util.OPS.beginInlineImage,
        numArgs: 0,
        variableArgs: false
      };
      t.ID = {
        id: _util.OPS.beginImageData,
        numArgs: 0,
        variableArgs: false
      };
      t.EI = {
        id: _util.OPS.endInlineImage,
        numArgs: 1,
        variableArgs: false
      };
      t.Do = {
        id: _util.OPS.paintXObject,
        numArgs: 1,
        variableArgs: false
      };
      t.MP = {
        id: _util.OPS.markPoint,
        numArgs: 1,
        variableArgs: false
      };
      t.DP = {
        id: _util.OPS.markPointProps,
        numArgs: 2,
        variableArgs: false
      };
      t.BMC = {
        id: _util.OPS.beginMarkedContent,
        numArgs: 1,
        variableArgs: false
      };
      t.BDC = {
        id: _util.OPS.beginMarkedContentProps,
        numArgs: 2,
        variableArgs: false
      };
      t.EMC = {
        id: _util.OPS.endMarkedContent,
        numArgs: 0,
        variableArgs: false
      };
      t.BX = {
        id: _util.OPS.beginCompat,
        numArgs: 0,
        variableArgs: false
      };
      t.EX = {
        id: _util.OPS.endCompat,
        numArgs: 0,
        variableArgs: false
      };
      t.BM = null;
      t.BD = null;
      t.true = null;
      t.fa = null;
      t.fal = null;
      t.fals = null;
      t.false = null;
      t.nu = null;
      t.nul = null;
      t.null = null;
    });
    return (0, _util.shadow)(this, "opMap", getOPMap());
  }

  static get MAX_INVALID_PATH_OPS() {
    return (0, _util.shadow)(this, "MAX_INVALID_PATH_OPS", 20);
  }

  constructor(stream, xref, stateManager = new StateManager()) {
    this.parser = new _parser.Parser({
      lexer: new _parser.Lexer(stream, EvaluatorPreprocessor.opMap),
      xref
    });
    this.stateManager = stateManager;
    this.nonProcessedArgs = [];
    this._numInvalidPathOPS = 0;
  }

  get savedStatesDepth() {
    return this.stateManager.stateStack.length;
  }

  read(operation) {
    let args = operation.args;

    while (true) {
      const obj = this.parser.getObj();

      if (obj instanceof _primitives.Cmd) {
        const cmd = obj.cmd;
        const opSpec = EvaluatorPreprocessor.opMap[cmd];

        if (!opSpec) {
          (0, _util.warn)(`Unknown command "${cmd}".`);
          continue;
        }

        const fn = opSpec.id;
        const numArgs = opSpec.numArgs;
        let argsLength = args !== null ? args.length : 0;

        if (!opSpec.variableArgs) {
          if (argsLength !== numArgs) {
            const nonProcessedArgs = this.nonProcessedArgs;

            while (argsLength > numArgs) {
              nonProcessedArgs.push(args.shift());
              argsLength--;
            }

            while (argsLength < numArgs && nonProcessedArgs.length !== 0) {
              if (args === null) {
                args = [];
              }

              args.unshift(nonProcessedArgs.pop());
              argsLength++;
            }
          }

          if (argsLength < numArgs) {
            const partialMsg = `command ${cmd}: expected ${numArgs} args, ` + `but received ${argsLength} args.`;

            if (fn >= _util.OPS.moveTo && fn <= _util.OPS.endPath && ++this._numInvalidPathOPS > EvaluatorPreprocessor.MAX_INVALID_PATH_OPS) {
              throw new _util.FormatError(`Invalid ${partialMsg}`);
            }

            (0, _util.warn)(`Skipping ${partialMsg}`);

            if (args !== null) {
              args.length = 0;
            }

            continue;
          }
        } else if (argsLength > numArgs) {
          (0, _util.info)(`Command ${cmd}: expected [0, ${numArgs}] args, ` + `but received ${argsLength} args.`);
        }

        this.preprocessCommand(fn, args);
        operation.fn = fn;
        operation.args = args;
        return true;
      }

      if (obj === _primitives.EOF) {
        return false;
      }

      if (obj !== null) {
        if (args === null) {
          args = [];
        }

        args.push(obj);

        if (args.length > 33) {
          throw new _util.FormatError("Too many arguments");
        }
      }
    }
  }

  preprocessCommand(fn, args) {
    switch (fn | 0) {
      case _util.OPS.save:
        this.stateManager.save();
        break;

      case _util.OPS.restore:
        this.stateManager.restore();
        break;

      case _util.OPS.transform:
        this.stateManager.transform(args);
        break;
    }
  }

}

exports.EvaluatorPreprocessor = EvaluatorPreprocessor;