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var processSelectors = require('./process-selectors');
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/**
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* Returns the matches of the first capture group in the given regular
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* expression in the specified rules (AST), without repetition
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*
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* @example
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* var rules = getRulesFromCode('[href] { background: red }');
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* var regexp = /\[(\w+)\]/g; // Notice the parenthesis!
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* selectorUniqueMatches(rules, regexp);
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* //> ['href']
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*
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* @param {Object[]} rules
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* @param {RegExp} regexp
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* @return {string[]}
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*/
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function selectorUniqueMatches(rules, regexp) {
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var resultSet = {};
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processSelectors(rules, function(selector) {
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var match;
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while (!!(match = regexp.exec(selector))) {
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resultSet[match[1]] = true;
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}
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});
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return Object.keys(resultSet);
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}
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module.exports = selectorUniqueMatches;
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