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