pdfjs-dist/lib/test/unit/fonts_spec.js

/* Copyright 2017 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.
 */
'use strict';
var coreFonts = require('../../core/fonts.js');
var sharedUtil = require('../../shared/util.js');
var ProblematicCharRanges = coreFonts.ProblematicCharRanges;
var PRIVATE_USE_OFFSET_START = coreFonts.PRIVATE_USE_OFFSET_START;
var PRIVATE_USE_OFFSET_END = coreFonts.PRIVATE_USE_OFFSET_END;
var isInt = sharedUtil.isInt;
var checkProblematicCharRanges = function checkProblematicCharRanges() {
 function printRange(limits) {
  return '[' + limits.lower.toString('16').toUpperCase() + ', ' + limits.upper.toString('16').toUpperCase() + ')';
 }
 var numRanges = ProblematicCharRanges.length;
 if (numRanges % 2 !== 0) {
  throw new Error('Char ranges must contain an even number of elements.');
 }
 var prevLimits, numChars = 0;
 for (var i = 0; i < numRanges; i += 2) {
  var limits = {
   lower: ProblematicCharRanges[i],
   upper: ProblematicCharRanges[i + 1]
  };
  if (!isInt(limits.lower) || !isInt(limits.upper)) {
   throw new Error('Range endpoints must be integers: ' + printRange(limits));
  }
  if (limits.lower < 0 || limits.upper < 0) {
   throw new Error('Range endpoints must be non-negative: ' + printRange(limits));
  }
  var range = limits.upper - limits.lower;
  if (range < 1) {
   throw new Error('Range must contain at least one element: ' + printRange(limits));
  }
  if (prevLimits) {
   if (limits.lower < prevLimits.lower) {
    throw new Error('Ranges must be sorted in ascending order: ' + printRange(limits) + ', ' + printRange(prevLimits));
   }
   if (limits.lower < prevLimits.upper) {
    throw new Error('Ranges must not overlap: ' + printRange(limits) + ', ' + printRange(prevLimits));
   }
  }
  prevLimits = {
   lower: limits.lower,
   upper: limits.upper
  };
  numChars += range;
 }
 var puaLength = PRIVATE_USE_OFFSET_END + 1 - PRIVATE_USE_OFFSET_START;
 if (numChars > puaLength) {
  throw new Error('Total number of chars must not exceed the PUA length.');
 }
 return {
  numChars: numChars,
  puaLength: puaLength,
  percentage: 100 * (numChars / puaLength)
 };
};
describe('Fonts', function () {
 it('checkProblematicCharRanges', function () {
  var EXPECTED_PERCENTAGE = 45;
  var result = checkProblematicCharRanges();
  expect(result.percentage).toBeLessThan(EXPECTED_PERCENTAGE);
 });
});