81 lines
2.9 KiB
JavaScript
81 lines
2.9 KiB
JavaScript
var isMergeable = require('./is-mergeable');
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var sortSelectors = require('../level-1/sort-selectors');
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var tidyRules = require('../level-1/tidy-rules');
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var OptimizationLevel = require('../../options/optimization-level').OptimizationLevel;
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var serializeBody = require('../../writer/one-time').body;
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var serializeRules = require('../../writer/one-time').rules;
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var Token = require('../../tokenizer/token');
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function unsafeSelector(value) {
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return /\.|\*| :/.test(value);
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}
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function isBemElement(token) {
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var asString = serializeRules(token[1]);
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return asString.indexOf('__') > -1 || asString.indexOf('--') > -1;
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}
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function withoutModifier(selector) {
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return selector.replace(/--[^ ,>\+~:]+/g, '');
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}
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function removeAnyUnsafeElements(left, candidates) {
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var leftSelector = withoutModifier(serializeRules(left[1]));
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for (var body in candidates) {
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var right = candidates[body];
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var rightSelector = withoutModifier(serializeRules(right[1]));
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if (rightSelector.indexOf(leftSelector) > -1 || leftSelector.indexOf(rightSelector) > -1)
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delete candidates[body];
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}
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}
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function mergeNonAdjacentByBody(tokens, context) {
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var options = context.options;
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var mergeSemantically = options.level[OptimizationLevel.Two].mergeSemantically;
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var adjacentSpace = options.compatibility.selectors.adjacentSpace;
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var selectorsSortingMethod = options.level[OptimizationLevel.One].selectorsSortingMethod;
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var mergeablePseudoClasses = options.compatibility.selectors.mergeablePseudoClasses;
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var mergeablePseudoElements = options.compatibility.selectors.mergeablePseudoElements;
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var multiplePseudoMerging = options.compatibility.selectors.multiplePseudoMerging;
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var candidates = {};
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for (var i = tokens.length - 1; i >= 0; i--) {
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var token = tokens[i];
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if (token[0] != Token.RULE)
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continue;
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if (token[2].length > 0 && (!mergeSemantically && unsafeSelector(serializeRules(token[1]))))
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candidates = {};
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if (token[2].length > 0 && mergeSemantically && isBemElement(token))
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removeAnyUnsafeElements(token, candidates);
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var candidateBody = serializeBody(token[2]);
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var oldToken = candidates[candidateBody];
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if (oldToken &&
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isMergeable(serializeRules(token[1]), mergeablePseudoClasses, mergeablePseudoElements, multiplePseudoMerging) &&
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isMergeable(serializeRules(oldToken[1]), mergeablePseudoClasses, mergeablePseudoElements, multiplePseudoMerging)) {
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if (token[2].length > 0) {
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token[1] = tidyRules(oldToken[1].concat(token[1]), false, adjacentSpace, false, context.warnings);
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token[1] = token[1].length > 1 ? sortSelectors(token[1], selectorsSortingMethod) : token[1];
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} else {
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token[1] = oldToken[1].concat(token[1]);
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}
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oldToken[2] = [];
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candidates[candidateBody] = null;
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}
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candidates[serializeBody(token[2])] = token;
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}
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}
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module.exports = mergeNonAdjacentByBody;
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