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108 lines
2.7 KiB
108 lines
2.7 KiB
6 years ago
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var List = require('css-tree').List;
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var resolveKeyword = require('css-tree').keyword;
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var hasOwnProperty = Object.prototype.hasOwnProperty;
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var walk = require('css-tree').walk;
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function addRuleToMap(map, item, list, single) {
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var node = item.data;
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var name = resolveKeyword(node.name).basename;
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var id = node.name.toLowerCase() + '/' + (node.prelude ? node.prelude.id : null);
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if (!hasOwnProperty.call(map, name)) {
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map[name] = Object.create(null);
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}
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if (single) {
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delete map[name][id];
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}
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if (!hasOwnProperty.call(map[name], id)) {
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map[name][id] = new List();
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}
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map[name][id].append(list.remove(item));
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}
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function relocateAtrules(ast, options) {
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var collected = Object.create(null);
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var topInjectPoint = null;
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ast.children.each(function(node, item, list) {
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if (node.type === 'Atrule') {
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var name = resolveKeyword(node.name).basename;
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switch (name) {
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case 'keyframes':
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addRuleToMap(collected, item, list, true);
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return;
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case 'media':
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if (options.forceMediaMerge) {
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addRuleToMap(collected, item, list, false);
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return;
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}
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break;
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}
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if (topInjectPoint === null &&
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name !== 'charset' &&
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name !== 'import') {
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topInjectPoint = item;
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}
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} else {
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if (topInjectPoint === null) {
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topInjectPoint = item;
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}
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}
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});
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for (var atrule in collected) {
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for (var id in collected[atrule]) {
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ast.children.insertList(
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collected[atrule][id],
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atrule === 'media' ? null : topInjectPoint
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);
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}
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}
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};
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function isMediaRule(node) {
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return node.type === 'Atrule' && node.name === 'media';
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}
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function processAtrule(node, item, list) {
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if (!isMediaRule(node)) {
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return;
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}
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var prev = item.prev && item.prev.data;
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if (!prev || !isMediaRule(prev)) {
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return;
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}
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// merge @media with same query
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if (node.prelude &&
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prev.prelude &&
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node.prelude.id === prev.prelude.id) {
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prev.block.children.appendList(node.block.children);
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list.remove(item);
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// TODO: use it when we can refer to several points in source
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// prev.loc = {
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// primary: prev.loc,
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// merged: node.loc
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// };
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}
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}
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module.exports = function rejoinAtrule(ast, options) {
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relocateAtrules(ast, options);
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walk(ast, {
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visit: 'Atrule',
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reverse: true,
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enter: processAtrule
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});
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};
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