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76 lines
2.8 KiB
76 lines
2.8 KiB
8 years ago
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/* Copyright 2017 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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var coreFonts = require('../../core/fonts.js');
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var sharedUtil = require('../../shared/util.js');
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var ProblematicCharRanges = coreFonts.ProblematicCharRanges;
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var PRIVATE_USE_OFFSET_START = coreFonts.PRIVATE_USE_OFFSET_START;
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var PRIVATE_USE_OFFSET_END = coreFonts.PRIVATE_USE_OFFSET_END;
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var isInt = sharedUtil.isInt;
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var checkProblematicCharRanges = function checkProblematicCharRanges() {
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function printRange(limits) {
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return '[' + limits.lower.toString('16').toUpperCase() + ', ' + limits.upper.toString('16').toUpperCase() + ')';
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}
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var numRanges = ProblematicCharRanges.length;
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if (numRanges % 2 !== 0) {
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throw new Error('Char ranges must contain an even number of elements.');
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}
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var prevLimits, numChars = 0;
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for (var i = 0; i < numRanges; i += 2) {
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var limits = {
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lower: ProblematicCharRanges[i],
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upper: ProblematicCharRanges[i + 1]
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};
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if (!isInt(limits.lower) || !isInt(limits.upper)) {
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throw new Error('Range endpoints must be integers: ' + printRange(limits));
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}
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if (limits.lower < 0 || limits.upper < 0) {
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throw new Error('Range endpoints must be non-negative: ' + printRange(limits));
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}
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var range = limits.upper - limits.lower;
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if (range < 1) {
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throw new Error('Range must contain at least one element: ' + printRange(limits));
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}
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if (prevLimits) {
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if (limits.lower < prevLimits.lower) {
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throw new Error('Ranges must be sorted in ascending order: ' + printRange(limits) + ', ' + printRange(prevLimits));
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}
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if (limits.lower < prevLimits.upper) {
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throw new Error('Ranges must not overlap: ' + printRange(limits) + ', ' + printRange(prevLimits));
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}
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}
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prevLimits = {
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lower: limits.lower,
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upper: limits.upper
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};
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numChars += range;
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}
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var puaLength = PRIVATE_USE_OFFSET_END + 1 - PRIVATE_USE_OFFSET_START;
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if (numChars > puaLength) {
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throw new Error('Total number of chars must not exceed the PUA length.');
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}
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return {
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numChars: numChars,
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puaLength: puaLength,
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percentage: 100 * (numChars / puaLength)
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};
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};
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describe('Fonts', function () {
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it('checkProblematicCharRanges', function () {
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var EXPECTED_PERCENTAGE = 45;
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var result = checkProblematicCharRanges();
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expect(result.percentage).toBeLessThan(EXPECTED_PERCENTAGE);
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});
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});
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