pdfjs-dist/test/unit/parser_spec.js

/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
/* globals expect, it, describe, StringStream, Lexer, Linearization */

'use strict';

describe('parser', function() {
  describe('Lexer', function() {
    it('should stop parsing numbers at the end of stream', function() {
      var input = new StringStream('11.234');
      var lexer = new Lexer(input);
      var result = lexer.getNumber();

      expect(result).toEqual(11.234);
    });

    it('should parse PostScript numbers', function() {
      var numbers = ['-.002', '34.5', '-3.62', '123.6e10', '1E-5', '-1.', '0.0',
                    '123', '-98', '43445', '0', '+17'];
      for (var i = 0, ii = numbers.length; i < ii; i++) {
        var num = numbers[i];
        var input = new StringStream(num);
        var lexer = new Lexer(input);
        var result = lexer.getNumber();

        expect(result).toEqual(parseFloat(num));
      }
    });

    it('should ignore double negative before number', function() {
      var input = new StringStream('--205.88');
      var lexer = new Lexer(input);
      var result = lexer.getNumber();

      expect(result).toEqual(-205.88);
    });

    it('should handle glued numbers and operators', function() {
      var input = new StringStream('123ET');
      var lexer = new Lexer(input);
      var value = lexer.getNumber();

      expect(value).toEqual(123);
      // The lexer must not have consumed the 'E'
      expect(lexer.currentChar).toEqual(0x45); // 'E'
    });

    it('should stop parsing strings at the end of stream', function() {
      var input = new StringStream('(1$4)');
      input.getByte = function(super_getByte) {
        // simulating end of file using null (see issue 2766)
        var ch = super_getByte.call(input);
        return (ch === 0x24 /* '$' */ ? -1 : ch);
      }.bind(input, input.getByte);
      var lexer = new Lexer(input);
      var result = lexer.getString();

      expect(result).toEqual('1');
    });

    it('should not throw exception on bad input', function() {
      // '8 0 2 15 5 2 2 2 4 3 2 4'
      // should be parsed as
      // '80 21 55 22 24 32'
      var input = new StringStream('<7 0 2 15 5 2 2 2 4 3 2 4>');
      var lexer = new Lexer(input);
      var result = lexer.getHexString();

      expect(result).toEqual('p!U"$2');
    });

    it('should ignore escaped CR and LF', function() {
      // '(\101\<CR><LF>\102)'
      // should be parsed as
      // "AB"
      var input = new StringStream('(\\101\\\r\n\\102\\\r\\103\\\n\\104)');
      var lexer = new Lexer(input);
      var result = lexer.getString();

      expect(result).toEqual('ABCD');
    });
  });

  describe('Linearization', function() {
    it('should not find a linearization dictionary', function () {
      // Not an actual linearization dictionary.
      var stream1 = new StringStream(
        '3 0 obj\n' +
        '<<\n' +
        '/Length 4622\n' +
        '/Filter /FlateDecode\n' +
        '>>\n' +
        'endobj'
      );
      expect(Linearization.create(stream1)).toEqual(null);

      // Linearization dictionary with invalid version number.
      var stream2 = new StringStream(
        '1 0 obj\n' +
        '<<\n' +
        '/Linearized 0\n' +
        '>>\n' +
        'endobj'
      );
      expect(Linearization.create(stream2)).toEqual(null);
    });

    it('should accept a valid linearization dictionary', function () {
      var stream = new 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'
      );
      var expectedLinearizationDict = {
        length: 90,
        hints: [1388, 863],
        objectNumberFirst: 133,
        endFirst: 43573,
        numPages: 18,
        mainXRefEntriesOffset: 193883,
        pageFirst: 0,
      };
      expect(Linearization.create(stream)).toEqual(expectedLinearizationDict);
    });

    it('should reject a linearization dictionary with invalid ' +
       'integer parameters', function () {
      // The /L parameter should be equal to the stream length.
      var stream1 = new 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 Linearization.create(stream1);
      }).toThrow(new Error('The "L" parameter in the linearization ' +
                           'dictionary does not equal the stream length.'));

      // The /E parameter should not be zero.
      var stream2 = new 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 Linearization.create(stream2);
      }).toThrow(new Error('The "E" parameter in the linearization ' +
                           'dictionary is invalid.'));

      // The /O parameter should be an integer.
      var stream3 = new 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 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 () {
      // The /H parameter should be an array.
      var stream1 = new 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 Linearization.create(stream1);
      }).toThrow(new Error('Hint array in the linearization dictionary ' +
                           'is invalid.'));

      // The hint array should contain two, or four, elements.
      var stream2 = new 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 Linearization.create(stream2);
      }).toThrow(new Error('Hint array in the linearization dictionary ' +
                           'is invalid.'));

      // The hint array should not contain zero.
      var stream3 = new 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 Linearization.create(stream3);
      }).toThrow(new Error('Hint (2) in the linearization dictionary ' +
                           'is invalid.'));
    });
  });
});