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