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95 lines
2.9 KiB
95 lines
2.9 KiB
var generate = require('css-tree').generate;
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var specificity = require('./specificity');
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var nonFreezePseudoElements = {
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'first-letter': true,
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'first-line': true,
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'after': true,
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'before': true
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};
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var nonFreezePseudoClasses = {
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'link': true,
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'visited': true,
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'hover': true,
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'active': true,
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'first-letter': true,
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'first-line': true,
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'after': true,
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'before': true
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};
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module.exports = function freeze(node, usageData) {
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var pseudos = Object.create(null);
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var hasPseudo = false;
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node.prelude.children.each(function(simpleSelector) {
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var tagName = '*';
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var scope = 0;
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simpleSelector.children.each(function(node) {
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switch (node.type) {
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case 'ClassSelector':
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if (usageData && usageData.scopes) {
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var classScope = usageData.scopes[node.name] || 0;
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if (scope !== 0 && classScope !== scope) {
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throw new Error('Selector can\'t has classes from different scopes: ' + generate(simpleSelector));
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}
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scope = classScope;
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}
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break;
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case 'PseudoClassSelector':
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var name = node.name.toLowerCase();
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if (!nonFreezePseudoClasses.hasOwnProperty(name)) {
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pseudos[':' + name] = true;
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hasPseudo = true;
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}
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break;
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case 'PseudoElementSelector':
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var name = node.name.toLowerCase();
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if (!nonFreezePseudoElements.hasOwnProperty(name)) {
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pseudos['::' + name] = true;
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hasPseudo = true;
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}
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break;
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case 'TypeSelector':
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tagName = node.name.toLowerCase();
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break;
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case 'AttributeSelector':
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if (node.flags) {
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pseudos['[' + node.flags.toLowerCase() + ']'] = true;
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hasPseudo = true;
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}
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break;
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case 'WhiteSpace':
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case 'Combinator':
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tagName = '*';
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break;
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}
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});
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simpleSelector.compareMarker = specificity(simpleSelector).toString();
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simpleSelector.id = null; // pre-init property to avoid multiple hidden class
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simpleSelector.id = generate(simpleSelector);
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if (scope) {
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simpleSelector.compareMarker += ':' + scope;
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}
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if (tagName !== '*') {
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simpleSelector.compareMarker += ',' + tagName;
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}
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});
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// add property to all rule nodes to avoid multiple hidden class
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node.pseudoSignature = hasPseudo && Object.keys(pseudos).sort().join(',');
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};
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