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