lepu-test-platform-web/node_modules/postcss-normalize-unicode/dist/index.js

93 lines
2.5 KiB
JavaScript

'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'];