53 lines
1.2 KiB
JavaScript
53 lines
1.2 KiB
JavaScript
'use strict';
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var Parser = require('css-selector-parser').CssSelectorParser,
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nthCheck = require('nth-check');
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module.exports = function parseSelector (selector) {
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var parser = new Parser;
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parser.registerNestingOperators('>', '+', '~');
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parser.registerAttrEqualityMods('^', '*', '$');
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parser.registerSelectorPseudos('not');
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return compileNthChecks(parser.parse(selector));
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};
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function compileNthChecks (ast) {
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if (ast == null) {
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return ast;
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}
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switch (ast.type) {
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case 'selectors':
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ast.selectors.forEach(compileNthChecks);
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break;
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case 'ruleSet':
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compileNthChecks(ast.rule);
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break;
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case 'rule':
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if (ast.pseudos) {
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ast.pseudos.forEach(function (pseudo) {
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if (pseudo.name == 'nth-child' ||
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pseudo.name == 'nth-last-child' ||
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pseudo.name == 'nth-of-type' ||
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pseudo.name == 'nth-last-of-type') {
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pseudo.value = nthCheck(pseudo.value);
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pseudo.valueType = 'function';
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}
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});
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}
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if (ast.rule) {
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compileNthChecks(ast.rule);
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}
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break;
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default:
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throw Error('Undefined AST node: ' + ast.type);
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}
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return ast;
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}
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