'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'];
|
