pdfjs-dist/lib/test/unit/parser_spec.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";

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

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

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

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

describe("parser", function () {
  describe("Parser", function () {
    describe("inlineStreamSkipEI", function () {
      it("should skip over the EI marker if it is found", function () {
        const string = "q 1 0 0 1 0 0 cm BI /W 10 /H 10 /BPC 1 " + "/F /A85 ID abc123~> EI Q";
        const input = new _stream.StringStream(string);
        const parser = new _parser.Parser({
          lexer: new _parser.Lexer(input),
          xref: null,
          allowStreams: true
        });
        parser.inlineStreamSkipEI(input);
        expect(input.pos).toEqual(string.indexOf("Q"));
        expect(input.peekByte()).toEqual(0x51);
      });
      it("should skip to the end of stream if the EI marker is not found", function () {
        const string = "q 1 0 0 1 0 0 cm BI /W 10 /H 10 /BPC 1 /F /A85 ID abc123~> Q";
        const input = new _stream.StringStream(string);
        const parser = new _parser.Parser({
          lexer: new _parser.Lexer(input),
          xref: null,
          allowStreams: true
        });
        parser.inlineStreamSkipEI(input);
        expect(input.pos).toEqual(string.length);
        expect(input.peekByte()).toEqual(-1);
      });
    });
  });
  describe("Lexer", function () {
    describe("nextChar", function () {
      it("should return and set -1 when the end of the stream is reached", function () {
        const input = new _stream.StringStream("");
        const lexer = new _parser.Lexer(input);
        expect(lexer.nextChar()).toEqual(-1);
        expect(lexer.currentChar).toEqual(-1);
      });
      it("should return and set the character after the current position", function () {
        const input = new _stream.StringStream("123");
        const lexer = new _parser.Lexer(input);
        expect(lexer.nextChar()).toEqual(0x32);
        expect(lexer.currentChar).toEqual(0x32);
      });
    });
    describe("peekChar", function () {
      it("should only return -1 when the end of the stream is reached", function () {
        const input = new _stream.StringStream("");
        const lexer = new _parser.Lexer(input);
        expect(lexer.peekChar()).toEqual(-1);
        expect(lexer.currentChar).toEqual(-1);
      });
      it("should only return the character after the current position", function () {
        const input = new _stream.StringStream("123");
        const lexer = new _parser.Lexer(input);
        expect(lexer.peekChar()).toEqual(0x32);
        expect(lexer.currentChar).toEqual(0x31);
      });
    });
    describe("getNumber", function () {
      it("should stop parsing numbers at the end of stream", function () {
        const input = new _stream.StringStream("11.234");
        const lexer = new _parser.Lexer(input);
        expect(lexer.getNumber()).toEqual(11.234);
      });
      it("should parse PostScript numbers", function () {
        const numbers = ["-.002", "34.5", "-3.62", "123.6e10", "1E-5", "-1.", "0.0", "123", "-98", "43445", "0", "+17"];

        for (const number of numbers) {
          const input = new _stream.StringStream(number);
          const lexer = new _parser.Lexer(input);
          const result = lexer.getNumber(),
                expected = parseFloat(number);

          if (result !== expected && Math.abs(result - expected) < 1e-15) {
            console.error(`Fuzzy matching "${result}" with "${expected}" to ` + "work-around rounding bugs in Chromium browsers.");
            expect(true).toEqual(true);
            continue;
          }

          expect(result).toEqual(expected);
        }
      });
      it("should ignore double negative before number", function () {
        const input = new _stream.StringStream("--205.88");
        const lexer = new _parser.Lexer(input);
        expect(lexer.getNumber()).toEqual(-205.88);
      });
      it("should ignore minus signs in the middle of number", function () {
        const input = new _stream.StringStream("205--.88");
        const lexer = new _parser.Lexer(input);
        expect(lexer.getNumber()).toEqual(205.88);
      });
      it("should ignore line-breaks between operator and digit in number", function () {
        const minusInput = new _stream.StringStream("-\r\n205.88");
        const minusLexer = new _parser.Lexer(minusInput);
        expect(minusLexer.getNumber()).toEqual(-205.88);
        const plusInput = new _stream.StringStream("+\r\n205.88");
        const plusLexer = new _parser.Lexer(plusInput);
        expect(plusLexer.getNumber()).toEqual(205.88);
      });
      it("should treat a single decimal point as zero", function () {
        const input = new _stream.StringStream(".");
        const lexer = new _parser.Lexer(input);
        expect(lexer.getNumber()).toEqual(0);
        const numbers = ["..", "-.", "+.", "-\r\n.", "+\r\n."];

        for (const number of numbers) {
          const invalidInput = new _stream.StringStream(number);
          const invalidLexer = new _parser.Lexer(invalidInput);
          expect(function () {
            return invalidLexer.getNumber();
          }).toThrowError(_util.FormatError, /^Invalid number:\s/);
        }
      });
      it("should handle glued numbers and operators", function () {
        const input = new _stream.StringStream("123ET");
        const lexer = new _parser.Lexer(input);
        expect(lexer.getNumber()).toEqual(123);
        expect(lexer.currentChar).toEqual(0x45);
      });
    });
    describe("getString", function () {
      it("should stop parsing strings at the end of stream", function () {
        const input = new _stream.StringStream("(1$4)");

        input.getByte = function (super_getByte) {
          const ch = super_getByte.call(input);
          return ch === 0x24 ? -1 : ch;
        }.bind(input, input.getByte);

        const lexer = new _parser.Lexer(input);
        expect(lexer.getString()).toEqual("1");
      });
      it("should ignore escaped CR and LF", function () {
        const input = new _stream.StringStream("(\\101\\\r\n\\102\\\r\\103\\\n\\104)");
        const lexer = new _parser.Lexer(input);
        expect(lexer.getString()).toEqual("ABCD");
      });
    });
    describe("getHexString", function () {
      it("should not throw exception on bad input", function () {
        const input = new _stream.StringStream("<7 0 2 15 5 2 2 2 4 3 2 4>");
        const lexer = new _parser.Lexer(input);
        expect(lexer.getHexString()).toEqual('p!U"$2');
      });
    });
    describe("getName", function () {
      it("should handle Names with invalid usage of NUMBER SIGN (#)", function () {
        const inputNames = ["/# 680 0 R", "/#AQwerty", "/#A<</B"];
        const expectedNames = ["#", "#AQwerty", "#A"];

        for (let i = 0, ii = inputNames.length; i < ii; i++) {
          const input = new _stream.StringStream(inputNames[i]);
          const lexer = new _parser.Lexer(input);
          expect(lexer.getName()).toEqual(_primitives.Name.get(expectedNames[i]));
        }
      });
    });
  });
  describe("Linearization", function () {
    it("should not find a linearization dictionary", function () {
      const stream1 = new _stream.StringStream("3 0 obj\n" + "<<\n" + "/Length 4622\n" + "/Filter /FlateDecode\n" + ">>\n" + "endobj");
      expect(_parser.Linearization.create(stream1)).toEqual(null);
      const stream2 = new _stream.StringStream("1 0 obj\n" + "<<\n" + "/Linearized 0\n" + ">>\n" + "endobj");
      expect(_parser.Linearization.create(stream2)).toEqual(null);
    });
    it("should accept a valid linearization dictionary", function () {
      const stream = new _stream.StringStream("131 0 obj\n" + "<<\n" + "/Linearized 1\n" + "/O 133\n" + "/H [ 1388 863 ]\n" + "/L 90\n" + "/E 43573\n" + "/N 18\n" + "/T 193883\n" + ">>\n" + "endobj");
      const expectedLinearizationDict = {
        length: 90,
        hints: [1388, 863],
        objectNumberFirst: 133,
        endFirst: 43573,
        numPages: 18,
        mainXRefEntriesOffset: 193883,
        pageFirst: 0
      };
      expect(_parser.Linearization.create(stream)).toEqual(expectedLinearizationDict);
    });
    it("should reject a linearization dictionary with invalid " + "integer parameters", function () {
      const stream1 = new _stream.StringStream("1 0 obj\n" + "<<\n" + "/Linearized 1\n" + "/O 133\n" + "/H [ 1388 863 ]\n" + "/L 196622\n" + "/E 43573\n" + "/N 18\n" + "/T 193883\n" + ">>\n" + "endobj");
      expect(function () {
        return _parser.Linearization.create(stream1);
      }).toThrow(new Error('The "L" parameter in the linearization ' + "dictionary does not equal the stream length."));
      const stream2 = new _stream.StringStream("1 0 obj\n" + "<<\n" + "/Linearized 1\n" + "/O 133\n" + "/H [ 1388 863 ]\n" + "/L 84\n" + "/E 0\n" + "/N 18\n" + "/T 193883\n" + ">>\n" + "endobj");
      expect(function () {
        return _parser.Linearization.create(stream2);
      }).toThrow(new Error('The "E" parameter in the linearization dictionary is invalid.'));
      const stream3 = new _stream.StringStream("1 0 obj\n" + "<<\n" + "/Linearized 1\n" + "/O /abc\n" + "/H [ 1388 863 ]\n" + "/L 89\n" + "/E 43573\n" + "/N 18\n" + "/T 193883\n" + ">>\n" + "endobj");
      expect(function () {
        return _parser.Linearization.create(stream3);
      }).toThrow(new Error('The "O" parameter in the linearization dictionary is invalid.'));
    });
    it("should reject a linearization dictionary with invalid hint parameters", function () {
      const stream1 = new _stream.StringStream("1 0 obj\n" + "<<\n" + "/Linearized 1\n" + "/O 133\n" + "/H 1388\n" + "/L 80\n" + "/E 43573\n" + "/N 18\n" + "/T 193883\n" + ">>\n" + "endobj");
      expect(function () {
        return _parser.Linearization.create(stream1);
      }).toThrow(new Error("Hint array in the linearization dictionary is invalid."));
      const stream2 = new _stream.StringStream("1 0 obj\n" + "<<\n" + "/Linearized 1\n" + "/O 133\n" + "/H [ 1388 ]\n" + "/L 84\n" + "/E 43573\n" + "/N 18\n" + "/T 193883\n" + ">>\n" + "endobj");
      expect(function () {
        return _parser.Linearization.create(stream2);
      }).toThrow(new Error("Hint array in the linearization dictionary is invalid."));
      const stream3 = new _stream.StringStream("1 0 obj\n" + "<<\n" + "/Linearized 1\n" + "/O 133\n" + "/H [ 1388 863 0 234]\n" + "/L 93\n" + "/E 43573\n" + "/N 18\n" + "/T 193883\n" + ">>\n" + "endobj");
      expect(function () {
        return _parser.Linearization.create(stream3);
      }).toThrow(new Error("Hint (2) in the linearization dictionary is invalid."));
    });
  });
});