92 lines
3.1 KiB
JavaScript
92 lines
3.1 KiB
JavaScript
/* 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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import {
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PRIVATE_USE_OFFSET_END, PRIVATE_USE_OFFSET_START, ProblematicCharRanges
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} from '../../src/core/fonts';
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/**
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* Used to validate the entries in `ProblematicCharRanges`, and to ensure that
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* its total number of characters does not exceed the PUA (Private Use Area)
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* length.
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* @returns {Object} An object with {number} `numChars`, {number} `puaLength`,
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* and {number} `percentage` parameters.
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*/
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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() + ', ' +
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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 (!Number.isInteger(limits.lower) || !Number.isInteger(limits.upper)) {
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throw new Error('Range endpoints must be integers: ' +
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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: ' +
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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: ' +
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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: ' +
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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: ' +
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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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// The current range is OK.
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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,
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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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