107 lines
3.1 KiB
JavaScript
107 lines
3.1 KiB
JavaScript
var postcss = require('postcss');
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var valueParser = require('postcss-value-parser');
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var stringify = valueParser.stringify;
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var sort = require('alphanum-sort');
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var uniqs = require('uniqs');
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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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var divisor = gcd(a, b);
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return [a / divisor, b / divisor];
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}
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function split(nodes, div) {
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var result = [];
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var i, max, node;
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var last = '';
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for (i = 0, max = nodes.length; i < max; i += 1) {
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node = nodes[i];
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if (node.type === 'div' && node.value === div) {
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result.push(last);
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last = '';
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} else {
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last += stringify(node);
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}
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}
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result.push(last);
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return result;
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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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module.exports = postcss.plugin('postcss-minify-params', function () {
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return function (css) {
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css.walkAtRules(function (rule) {
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if (!rule.params) {
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return;
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}
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var params = valueParser(rule.params);
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params.walk(function (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 (
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node.type === 'function' &&
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node.nodes[4] &&
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node.nodes[0].value.indexOf('-aspect-ratio') === 3
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) {
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var ref = aspectRatio(
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node.nodes[2].value,
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node.nodes[4].value
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);
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var a = ref[0];
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var b = ref[1];
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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 if (node.type === 'word') {
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var prevWord = params.nodes[index - 2];
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if (
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node.value === 'all' &&
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rule.name === 'media' &&
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!prevWord
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) {
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var nextSpace = params.nodes[index + 1];
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var nextWord = params.nodes[index + 2];
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var secondSpace = params.nodes[index + 3];
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if (nextWord && nextWord.value === 'and') {
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removeNode(nextWord);
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removeNode(nextSpace);
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if (secondSpace) {
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removeNode(secondSpace);
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}
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}
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removeNode(node);
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}
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}
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}, true);
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rule.params = sort(uniqs(split(params.nodes, ',')), {
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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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};
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});
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