aaac7fed
 liuqimichale
add
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var isMergeable = require('./is-mergeable');
var sortSelectors = require('../level-1/sort-selectors');
var tidyRules = require('../level-1/tidy-rules');
var OptimizationLevel = require('../../options/optimization-level').OptimizationLevel;
var serializeBody = require('../../writer/one-time').body;
var serializeRules = require('../../writer/one-time').rules;
var Token = require('../../tokenizer/token');
function unsafeSelector(value) {
return /\.|\*| :/.test(value);
}
function isBemElement(token) {
var asString = serializeRules(token[1]);
return asString.indexOf('__') > -1 || asString.indexOf('--') > -1;
}
function withoutModifier(selector) {
return selector.replace(/--[^ ,>\+~:]+/g, '');
}
function removeAnyUnsafeElements(left, candidates) {
var leftSelector = withoutModifier(serializeRules(left[1]));
for (var body in candidates) {
var right = candidates[body];
var rightSelector = withoutModifier(serializeRules(right[1]));
if (rightSelector.indexOf(leftSelector) > -1 || leftSelector.indexOf(rightSelector) > -1)
delete candidates[body];
}
}
function mergeNonAdjacentByBody(tokens, context) {
var options = context.options;
var mergeSemantically = options.level[OptimizationLevel.Two].mergeSemantically;
var adjacentSpace = options.compatibility.selectors.adjacentSpace;
var selectorsSortingMethod = options.level[OptimizationLevel.One].selectorsSortingMethod;
var mergeablePseudoClasses = options.compatibility.selectors.mergeablePseudoClasses;
var mergeablePseudoElements = options.compatibility.selectors.mergeablePseudoElements;
var multiplePseudoMerging = options.compatibility.selectors.multiplePseudoMerging;
var candidates = {};
for (var i = tokens.length - 1; i >= 0; i--) {
var token = tokens[i];
if (token[0] != Token.RULE)
continue;
if (token[2].length > 0 && (!mergeSemantically && unsafeSelector(serializeRules(token[1]))))
candidates = {};
if (token[2].length > 0 && mergeSemantically && isBemElement(token))
removeAnyUnsafeElements(token, candidates);
var candidateBody = serializeBody(token[2]);
var oldToken = candidates[candidateBody];
if (oldToken &&
isMergeable(serializeRules(token[1]), mergeablePseudoClasses, mergeablePseudoElements, multiplePseudoMerging) &&
isMergeable(serializeRules(oldToken[1]), mergeablePseudoClasses, mergeablePseudoElements, multiplePseudoMerging)) {
if (token[2].length > 0) {
token[1] = tidyRules(oldToken[1].concat(token[1]), false, adjacentSpace, false, context.warnings);
token[1] = token[1].length > 1 ? sortSelectors(token[1], selectorsSortingMethod) : token[1];
} else {
token[1] = oldToken[1].concat(token[1]);
}
oldToken[2] = [];
candidates[candidateBody] = null;
}
candidates[serializeBody(token[2])] = token;
}
}
module.exports = mergeNonAdjacentByBody;
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