'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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var _alphanumSort = require('alphanum-sort');
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var _alphanumSort2 = _interopRequireDefault(_alphanumSort);
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var _uniqs = require('uniqs');
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var _uniqs2 = _interopRequireDefault(_uniqs);
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var _cssnanoUtilGetArguments = require('cssnano-util-get-arguments');
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var _cssnanoUtilGetArguments2 = _interopRequireDefault(_cssnanoUtilGetArguments);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* Return the greatest common divisor
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* of two numbers.
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*/
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function gcd(a, b) {
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return b ? gcd(b, a % b) : a;
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}
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function aspectRatio(a, b) {
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const divisor = gcd(a, b);
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return [a / divisor, b / divisor];
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}
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function split(args) {
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return args.map(arg => (0, _postcssValueParser.stringify)(arg)).join('');
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}
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function removeNode(node) {
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node.value = '';
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node.type = 'word';
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}
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function transform(legacy, rule) {
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const ruleName = rule.name.toLowerCase();
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// We should re-arrange parameters only for `@media` and `@supports` at-rules
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if (!rule.params || !["media", "supports"].includes(ruleName)) {
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return;
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}
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const params = (0, _postcssValueParser2.default)(rule.params);
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params.walk((node, index) => {
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if (node.type === 'div' || node.type === 'function') {
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node.before = node.after = '';
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if (node.type === 'function' && node.nodes[4] && node.nodes[0].value.toLowerCase().indexOf('-aspect-ratio') === 3) {
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const [a, b] = aspectRatio(node.nodes[2].value, node.nodes[4].value);
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node.nodes[2].value = a;
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node.nodes[4].value = b;
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}
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} else if (node.type === 'space') {
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node.value = ' ';
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} else {
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const prevWord = params.nodes[index - 2];
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if (node.value.toLowerCase() === 'all' && rule.name.toLowerCase() === 'media' && !prevWord) {
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const nextWord = params.nodes[index + 2];
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if (!legacy || nextWord) {
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removeNode(node);
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}
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if (nextWord && nextWord.value.toLowerCase() === 'and') {
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const nextSpace = params.nodes[index + 1];
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const secondSpace = params.nodes[index + 3];
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removeNode(nextWord);
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removeNode(nextSpace);
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removeNode(secondSpace);
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}
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}
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}
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}, true);
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rule.params = (0, _alphanumSort2.default)((0, _uniqs2.default)((0, _cssnanoUtilGetArguments2.default)(params).map(split)), {
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insensitive: true
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}).join();
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if (!rule.params.length) {
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rule.raws.afterName = '';
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}
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}
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function hasAllBug(browser) {
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return ~['ie 10', 'ie 11'].indexOf(browser);
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}
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exports.default = _postcss2.default.plugin('postcss-minify-params', () => {
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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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return css.walkAtRules(transform.bind(null, browsers.some(hasAllBug)));
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};
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});
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module.exports = exports['default'];
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