42 lines
767 B
JavaScript
42 lines
767 B
JavaScript
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'use strict';
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const { htmlTypeSelectors } = require('../reference/selectors');
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const mathMLTags = require('mathml-tag-names');
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const svgTags = require('svg-tags');
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/**
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* Check whether a type selector is a custom element
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*
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* @param {string} selector
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* @returns {boolean}
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*/
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module.exports = function isCustomElement(selector) {
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if (!/^[a-z]/.test(selector)) {
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return false;
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}
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if (!selector.includes('-')) {
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return false;
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}
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const selectorLowerCase = selector.toLowerCase();
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if (selectorLowerCase !== selector) {
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return false;
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}
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if (svgTags.includes(selectorLowerCase)) {
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return false;
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}
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if (htmlTypeSelectors.has(selectorLowerCase)) {
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return false;
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}
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if (mathMLTags.includes(selectorLowerCase)) {
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return false;
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}
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return true;
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};
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