74 lines
1.8 KiB
JavaScript
74 lines
1.8 KiB
JavaScript
var hasOwnProperty = Object.prototype.hasOwnProperty;
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var knownKeywords = Object.create(null);
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var knownProperties = Object.create(null);
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function getVendorPrefix(string) {
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if (string[0] === '-') {
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// skip 2 chars to avoid wrong match with variables names
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var secondDashIndex = string.indexOf('-', 2);
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if (secondDashIndex !== -1) {
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return string.substr(0, secondDashIndex + 1);
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}
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}
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return '';
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}
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function getKeywordInfo(keyword) {
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if (hasOwnProperty.call(knownKeywords, keyword)) {
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return knownKeywords[keyword];
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}
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var lowerCaseKeyword = keyword.toLowerCase();
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var vendor = getVendorPrefix(lowerCaseKeyword);
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var name = lowerCaseKeyword;
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if (vendor) {
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name = name.substr(vendor.length);
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}
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return knownKeywords[keyword] = Object.freeze({
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vendor: vendor,
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prefix: vendor,
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name: name
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});
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}
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function getPropertyInfo(property) {
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if (hasOwnProperty.call(knownProperties, property)) {
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return knownProperties[property];
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}
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var lowerCaseProperty = property.toLowerCase();
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var hack = lowerCaseProperty[0];
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if (hack === '*' || hack === '_' || hack === '$') {
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lowerCaseProperty = lowerCaseProperty.substr(1);
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} else if (hack === '/' && property[1] === '/') {
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hack = '//';
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lowerCaseProperty = lowerCaseProperty.substr(2);
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} else {
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hack = '';
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}
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var vendor = getVendorPrefix(lowerCaseProperty);
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var name = lowerCaseProperty;
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if (vendor) {
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name = name.substr(vendor.length);
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}
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return knownProperties[property] = Object.freeze({
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hack: hack,
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vendor: vendor,
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prefix: hack + vendor,
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name: name
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});
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}
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module.exports = {
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keyword: getKeywordInfo,
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property: getPropertyInfo
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};
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