46 lines
1.5 KiB
JavaScript
46 lines
1.5 KiB
JavaScript
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'use strict';
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const cssTree = require('css-tree');
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const createDeclarationIndexer = require('./createDeclarationIndexer.cjs');
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const processSelector = require('./processSelector.cjs');
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function prepare(ast, options) {
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const markDeclaration = createDeclarationIndexer();
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cssTree.walk(ast, {
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visit: 'Rule',
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enter(node) {
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node.block.children.forEach(markDeclaration);
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processSelector(node, options.usage);
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}
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});
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cssTree.walk(ast, {
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visit: 'Atrule',
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enter(node) {
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if (node.prelude) {
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node.prelude.id = null; // pre-init property to avoid multiple hidden class for generate
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node.prelude.id = cssTree.generate(node.prelude);
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}
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// compare keyframe selectors by its values
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// NOTE: still no clarification about problems with keyframes selector grouping (issue #197)
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if (cssTree.keyword(node.name).basename === 'keyframes') {
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node.block.avoidRulesMerge = true; /* probably we don't need to prevent those merges for @keyframes
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TODO: need to be checked */
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node.block.children.forEach(function(rule) {
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rule.prelude.children.forEach(function(simpleselector) {
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simpleselector.compareMarker = simpleselector.id;
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});
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});
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}
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}
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});
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return {
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declaration: markDeclaration
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};
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}
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module.exports = prepare;
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