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/**
* Check if the current block has a defined language.
* @param classList - A list of class.
* @returns {boolean} - True if a class starts with "language-".
*/
const isLanguageBlock = (classList: DOMTokenList) => {
const classes = Array.from(classList);
return classes.some((className) => /language-.*/.test(className));
};
/**
* Add automatically some classes and attributes for PrismJs.
*
* These classes and attributes are needed by Prism or to customize comments.
*/
export const addPrismClasses = () => {
const preTags = document.getElementsByTagName('pre');
Array.from(preTags).forEach((preTag) => {
if (
isLanguageBlock(preTag.classList) &&
!preTag.classList.contains('command-line') &&
!preTag.classList.contains('language-diff')
) {
preTag.classList.add('line-numbers', 'match-braces');
}
if (
preTag.classList.contains('command-line') &&
preTag.classList.contains('filter-output')
) {
preTag.setAttribute('data-filter-output', '#output#');
}
});
};
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