prismjs/plugins/remove-initial-line-feed/prism-remove-initial-line-feed.js

Lightweight, robust, elegant syntax highlighting. A spin-off project from Dabblet.

(function() {

if (typeof self === 'undefined' || !self.Prism || !self.document) {
	return;
}

Prism.hooks.add('before-sanity-check', function (env) {
	if (env.code) {
		var pre = env.element.parentNode;
		var clsReg = /(?:^|\s)keep-initial-line-feed(?:\s|$)/;
		if (
			pre && pre.nodeName.toLowerCase() === 'pre' &&
			// Apply only if nor the <pre> or the <code> have the class
			(!clsReg.test(pre.className) && !clsReg.test(env.element.className))
		) {
			env.code = env.code.replace(/^(?:\r?\n|\r)/, '');
		}
	}
});

}());