prism-show-language.js

(function(){

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

if (!Prism.plugins.toolbar) {
	console.warn('Show Languages plugin loaded before Toolbar plugin.');

	return;
}

// The languages map is built automatically with gulp
var Languages = /*languages_placeholder[*/{"html":"HTML","xml":"XML","svg":"SVG","mathml":"MathML","css":"CSS","clike":"C-like","javascript":"JavaScript","abap":"ABAP","actionscript":"ActionScript","apacheconf":"Apache Configuration","apl":"APL","applescript":"AppleScript","asciidoc":"AsciiDoc","aspnet":"ASP.NET (C#)","autoit":"AutoIt","autohotkey":"AutoHotkey","basic":"BASIC","csharp":"C#","cpp":"C++","coffeescript":"CoffeeScript","css-extras":"CSS Extras","django":"Django/Jinja2","fsharp":"F#","glsl":"GLSL","graphql":"GraphQL","http":"HTTP","inform7":"Inform 7","json":"JSON","latex":"LaTeX","livescript":"LiveScript","lolcode":"LOLCODE","matlab":"MATLAB","mel":"MEL","nasm":"NASM","nginx":"nginx","nsis":"NSIS","objectivec":"Objective-C","ocaml":"OCaml","parigp":"PARI/GP","php":"PHP","php-extras":"PHP Extras","powershell":"PowerShell","properties":".properties","protobuf":"Protocol Buffers","jsx":"React JSX","rest":"reST (reStructuredText)","sas":"SAS","sass":"Sass (Sass)","scss":"Sass (Scss)","sql":"SQL","typescript":"TypeScript","vhdl":"VHDL","vim":"vim","webidl":"Web IDL","wiki":"Wiki markup","xojo":"Xojo (REALbasic)","yaml":"YAML"}/*]*/;
Prism.plugins.toolbar.registerButton('show-language', function(env) {
	var pre = env.element.parentNode;
	if (!pre || !/pre/i.test(pre.nodeName)) {
		return;
	}
	var language = pre.getAttribute('data-language') || Languages[env.language] || (env.language.substring(0, 1).toUpperCase() + env.language.substring(1));

	var element = document.createElement('span');
	element.textContent = language;

	return element;
});

})();