| 1 | var generate = require('css-tree').generate;
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| 2 | var specificity = require('./specificity');
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| 3 |
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| 4 | var nonFreezePseudoElements = {
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| 5 | 'first-letter': true,
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| 6 | 'first-line': true,
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| 7 | 'after': true,
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| 8 | 'before': true
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| 9 | };
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| 10 | var nonFreezePseudoClasses = {
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| 11 | 'link': true,
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| 12 | 'visited': true,
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| 13 | 'hover': true,
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| 14 | 'active': true,
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| 15 | 'first-letter': true,
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| 16 | 'first-line': true,
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| 17 | 'after': true,
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| 18 | 'before': true
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| 19 | };
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| 20 |
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| 21 | module.exports = function freeze(node, usageData) {
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| 22 | var pseudos = Object.create(null);
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| 23 | var hasPseudo = false;
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| 24 |
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| 25 | node.prelude.children.each(function(simpleSelector) {
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| 26 | var tagName = '*';
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| 27 | var scope = 0;
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| 28 |
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| 29 | simpleSelector.children.each(function(node) {
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| 30 | switch (node.type) {
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| 31 | case 'ClassSelector':
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| 32 | if (usageData && usageData.scopes) {
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| 33 | var classScope = usageData.scopes[node.name] || 0;
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| 34 |
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| 35 | if (scope !== 0 && classScope !== scope) {
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| 36 | throw new Error('Selector can\'t has classes from different scopes: ' + generate(simpleSelector));
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| 37 | }
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| 38 |
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| 39 | scope = classScope;
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| 40 | }
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| 41 | break;
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| 42 |
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| 43 | case 'PseudoClassSelector':
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| 44 | var name = node.name.toLowerCase();
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| 45 |
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| 46 | if (!nonFreezePseudoClasses.hasOwnProperty(name)) {
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| 47 | pseudos[':' + name] = true;
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| 48 | hasPseudo = true;
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| 49 | }
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| 50 | break;
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| 51 |
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| 52 | case 'PseudoElementSelector':
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| 53 | var name = node.name.toLowerCase();
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| 54 |
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| 55 | if (!nonFreezePseudoElements.hasOwnProperty(name)) {
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| 56 | pseudos['::' + name] = true;
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| 57 | hasPseudo = true;
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| 58 | }
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| 59 | break;
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| 60 |
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| 61 | case 'TypeSelector':
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| 62 | tagName = node.name.toLowerCase();
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| 63 | break;
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| 64 |
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| 65 | case 'AttributeSelector':
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| 66 | if (node.flags) {
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| 67 | pseudos['[' + node.flags.toLowerCase() + ']'] = true;
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| 68 | hasPseudo = true;
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| 69 | }
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| 70 | break;
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| 71 |
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| 72 | case 'WhiteSpace':
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| 73 | case 'Combinator':
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| 74 | tagName = '*';
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| 75 | break;
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| 76 | }
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| 77 | });
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| 78 |
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| 79 | simpleSelector.compareMarker = specificity(simpleSelector).toString();
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| 80 | simpleSelector.id = null; // pre-init property to avoid multiple hidden class
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| 81 | simpleSelector.id = generate(simpleSelector);
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| 82 |
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| 83 | if (scope) {
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| 84 | simpleSelector.compareMarker += ':' + scope;
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| 85 | }
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| 86 |
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| 87 | if (tagName !== '*') {
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| 88 | simpleSelector.compareMarker += ',' + tagName;
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| 89 | }
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| 90 | });
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| 91 |
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| 92 | // add property to all rule nodes to avoid multiple hidden class
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| 93 | node.pseudoSignature = hasPseudo && Object.keys(pseudos).sort().join(',');
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| 94 | };
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