module.exports = function(selector /*: string*/) /*: boolean*/ {
if (!/^[a-z]/.test(selector)) {
return false;
}
if (selector.indexOf("-") === -1) {
return false;
}
const selectorLowerCase = selector.toLowerCase();
if (selectorLowerCase !== selector) {
return false;
}
if (svgTags.indexOf(selectorLowerCase) !== -1) {
return false;
}
if (htmlTags.indexOf(selectorLowerCase) !== -1) {
return false;
}
if (keywordSets.nonStandardHtmlTags.has(selectorLowerCase)) {
return false;
}
if (mathMLTags.indexOf(selectorLowerCase) !== -1) {
return false;
}
return true;
};
selectorTree.walkTags(tagNode => {
if (!isStandardSyntaxTypeSelector(tagNode)) {
return;
}
if (
optionsMatches(options, "ignore", "custom-elements") &&
isCustomElement(tagNode.value)
) {
return;
}
if (
optionsMatches(options, "ignore", "default-namespace") &&
!(typeof tagNode.namespace === "string")
) {
return;
}
if (optionsMatches(options, "ignoreNamespaces", tagNode.namespace)) {
return;
}
if (optionsMatches(options, "ignoreTypes", tagNode.value)) {
return;
}
const tagName = tagNode.value;
const tagNameLowerCase = tagName.toLowerCase();
if (
htmlTags.indexOf(tagNameLowerCase) !== -1 ||
svgTags.indexOf(tagNameLowerCase) !== -1 ||
keywordSets.nonStandardHtmlTags.has(tagNameLowerCase) ||
mathMLTags.indexOf(tagNameLowerCase) !== -1
) {
return;
}
report({
message: messages.rejected(tagName),
node: rule,
index: tagNode.sourceIndex,
ruleName,
result
});
});