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180 lines
5.5 KiB
180 lines
5.5 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 _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 _cssnanoUtilGetArguments = require('cssnano-util-get-arguments');
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var _cssnanoUtilGetArguments2 = _interopRequireDefault(_cssnanoUtilGetArguments);
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var _isColorStop = require('is-color-stop');
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var _isColorStop2 = _interopRequireDefault(_isColorStop);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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const angles = {
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top: '0deg',
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right: '90deg',
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bottom: '180deg',
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left: '270deg'
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};
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function isLessThan(a, b) {
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return a.unit.toLowerCase() === b.unit.toLowerCase() && parseFloat(a.number) >= parseFloat(b.number);
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}
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function optimise(decl) {
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const value = decl.value;
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if (!~value.toLowerCase().indexOf('gradient')) {
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return;
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}
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decl.value = (0, _postcssValueParser2.default)(value).walk(node => {
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if (node.type !== 'function' || !node.nodes.length) {
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return false;
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}
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const lowerCasedValue = node.value.toLowerCase();
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if (lowerCasedValue === 'linear-gradient' || lowerCasedValue === 'repeating-linear-gradient' || lowerCasedValue === '-webkit-linear-gradient' || lowerCasedValue === '-webkit-repeating-linear-gradient') {
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let args = (0, _cssnanoUtilGetArguments2.default)(node);
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if (node.nodes[0].value.toLowerCase() === 'to' && args[0].length === 3) {
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node.nodes = node.nodes.slice(2);
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node.nodes[0].value = angles[node.nodes[0].value.toLowerCase()];
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}
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let lastStop = null;
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args.forEach((arg, index) => {
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if (!arg[2]) {
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return;
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}
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let isFinalStop = index === args.length - 1;
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let thisStop = (0, _postcssValueParser.unit)(arg[2].value);
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if (lastStop === null) {
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lastStop = thisStop;
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if (!isFinalStop && lastStop && lastStop.number === '0' && lastStop.unit.toLowerCase() !== 'deg') {
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arg[1].value = arg[2].value = '';
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}
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return;
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}
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if (lastStop && thisStop && isLessThan(lastStop, thisStop)) {
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arg[2].value = 0;
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}
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lastStop = thisStop;
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if (isFinalStop && arg[2].value === '100%') {
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arg[1].value = arg[2].value = '';
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}
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});
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return false;
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}
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if (lowerCasedValue === 'radial-gradient' || lowerCasedValue === 'repeating-radial-gradient') {
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let args = (0, _cssnanoUtilGetArguments2.default)(node);
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let lastStop;
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const hasAt = args[0].find(n => n.value.toLowerCase() === 'at');
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args.forEach((arg, index) => {
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if (!arg[2] || !index && hasAt) {
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return;
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}
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let thisStop = (0, _postcssValueParser.unit)(arg[2].value);
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if (!lastStop) {
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lastStop = thisStop;
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return;
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}
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if (lastStop && thisStop && isLessThan(lastStop, thisStop)) {
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arg[2].value = 0;
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}
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lastStop = thisStop;
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});
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return false;
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}
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if (lowerCasedValue === '-webkit-radial-gradient' || lowerCasedValue === '-webkit-repeating-radial-gradient') {
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let args = (0, _cssnanoUtilGetArguments2.default)(node);
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let lastStop;
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args.forEach(arg => {
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let color;
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let stop;
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if (arg[2] !== undefined) {
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if (arg[0].type === 'function') {
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color = `${arg[0].value}(${(0, _postcssValueParser.stringify)(arg[0].nodes)})`;
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} else {
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color = arg[0].value;
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}
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if (arg[2].type === 'function') {
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stop = `${arg[2].value}(${(0, _postcssValueParser.stringify)(arg[2].nodes)})`;
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} else {
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stop = arg[2].value;
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}
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} else {
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if (arg[0].type === 'function') {
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color = `${arg[0].value}(${(0, _postcssValueParser.stringify)(arg[0].nodes)})`;
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}
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color = arg[0].value;
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}
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color = color.toLowerCase();
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const colorStop = stop || stop === 0 ? (0, _isColorStop2.default)(color, stop.toLowerCase()) : (0, _isColorStop2.default)(color);
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if (!colorStop || !arg[2]) {
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return;
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}
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let thisStop = (0, _postcssValueParser.unit)(arg[2].value);
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if (!lastStop) {
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lastStop = thisStop;
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return;
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}
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if (lastStop && thisStop && isLessThan(lastStop, thisStop)) {
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arg[2].value = 0;
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}
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lastStop = thisStop;
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});
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return false;
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}
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}).toString();
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}
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exports.default = _postcss2.default.plugin('postcss-minify-gradients', () => {
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return css => css.walkDecls(optimise);
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});
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module.exports = exports['default'];
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