forked from zhurui/management
62 lines
2.0 KiB
JavaScript
62 lines
2.0 KiB
JavaScript
var stringifyBody = require('../stringifier/one-time').body;
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var stringifySelectors = require('../stringifier/one-time').selectors;
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var cleanUpSelectors = require('./clean-up').selectors;
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var isSpecial = require('./is-special');
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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 = stringifySelectors(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(stringifySelectors(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(stringifySelectors(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, options) {
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var candidates = {};
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var adjacentSpace = options.compatibility.selectors.adjacentSpace;
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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] != 'selector')
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continue;
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if (token[2].length > 0 && (!options.semanticMerging && unsafeSelector(stringifySelectors(token[1]))))
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candidates = {};
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if (token[2].length > 0 && options.semanticMerging && isBemElement(token))
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removeAnyUnsafeElements(token, candidates);
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var candidateBody = stringifyBody(token[2]);
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var oldToken = candidates[candidateBody];
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if (oldToken && !isSpecial(options, stringifySelectors(token[1])) && !isSpecial(options, stringifySelectors(oldToken[1]))) {
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token[1] = token[2].length > 0 ?
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cleanUpSelectors(oldToken[1].concat(token[1]), false, adjacentSpace) :
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oldToken[1].concat(token[1]);
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oldToken[2] = [];
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candidates[candidateBody] = null;
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}
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candidates[stringifyBody(token[2])] = token;
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}
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}
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module.exports = mergeNonAdjacentByBody;
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