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93 lines
2.5 KiB
93 lines
2.5 KiB
'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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var _browserslist = require('browserslist');
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var _browserslist2 = _interopRequireDefault(_browserslist);
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var _postcss = require('postcss');
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var _postcss2 = _interopRequireDefault(_postcss);
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var _postcssValueParser = require('postcss-value-parser');
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var _postcssValueParser2 = _interopRequireDefault(_postcssValueParser);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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const regexLowerCaseUPrefix = /^u(?=\+)/;
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function unicode(range) {
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const values = range.slice(2).split('-');
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if (values.length < 2) {
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return range;
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}
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const left = values[0].split('');
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const right = values[1].split('');
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if (left.length !== right.length) {
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return range;
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}
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let questionCounter = 0;
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const merged = left.reduce((group, value, index) => {
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if (group === false) {
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return false;
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}
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if (value === right[index] && !questionCounter) {
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return group + value;
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}
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if (value === '0' && right[index] === 'f') {
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questionCounter++;
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return group + '?';
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}
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return false;
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}, 'u+');
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/*
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* The maximum number of wildcard characters (?) for ranges is 5.
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*/
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if (merged && questionCounter < 6) {
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return merged;
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}
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return range;
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}
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/*
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* IE and Edge before 16 version ignore the unicode-range if the 'U' is lowercase
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*
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* https://caniuse.com/#search=unicode-range
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*/
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function hasLowerCaseUPrefixBug(browser) {
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return ~(0, _browserslist2.default)('ie <=11, edge <= 15').indexOf(browser);
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}
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function transform(legacy = false, node) {
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node.value = (0, _postcssValueParser2.default)(node.value).walk(child => {
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if (child.type === 'word') {
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const transformed = unicode(child.value.toLowerCase());
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child.value = legacy ? transformed.replace(regexLowerCaseUPrefix, 'U') : transformed;
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}
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return false;
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}).toString();
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}
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exports.default = _postcss2.default.plugin('postcss-normalize-unicode', () => {
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return (css, result) => {
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const resultOpts = result.opts || {};
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const browsers = (0, _browserslist2.default)(null, {
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stats: resultOpts.stats,
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path: __dirname,
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env: resultOpts.env
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});
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css.walkDecls(/^unicode-range$/i, transform.bind(null, browsers.some(hasLowerCaseUPrefixBug)));
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};
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});
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module.exports = exports['default'];
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