49 lines
1.7 KiB
JavaScript
49 lines
1.7 KiB
JavaScript
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var utils = require('./utils.js');
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var walkRules = require('../../utils/walk.js').rules;
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function processRuleset(node, item, list) {
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var selectors = node.selector.selectors;
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var declarations = node.block.declarations;
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list.prevUntil(item.prev, function(prev) {
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// skip non-ruleset node if safe
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if (prev.type !== 'Ruleset') {
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return utils.unsafeToSkipNode.call(selectors, prev);
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}
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var prevSelectors = prev.selector.selectors;
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var prevDeclarations = prev.block.declarations;
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// try to join rulesets with equal pseudo signature
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if (node.pseudoSignature === prev.pseudoSignature) {
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// try to join by selectors
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if (utils.isEqualLists(prevSelectors, selectors)) {
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prevDeclarations.appendList(declarations);
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list.remove(item);
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return true;
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}
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// try to join by declarations
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if (utils.isEqualDeclarations(declarations, prevDeclarations)) {
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utils.addSelectors(prevSelectors, selectors);
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list.remove(item);
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return true;
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}
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}
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// go to prev ruleset if has no selector similarities
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return utils.hasSimilarSelectors(selectors, prevSelectors);
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});
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};
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// NOTE: direction should be left to right, since rulesets merge to left
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// ruleset. When direction right to left unmerged rulesets may prevent lookup
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// TODO: remove initial merge
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module.exports = function initialMergeRuleset(ast) {
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walkRules(ast, function(node, item, list) {
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if (node.type === 'Ruleset') {
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processRuleset(node, item, list);
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}
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});
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};
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