Added support for etlua (PrismJS#2050)

This adds support for etlua (Embedded Lua templating).

components.json

@@ -280,6 +280,11 @@
 			"title": "Elm",
 			"owner": "zwilias"
 		},
+		"etlua": {
+			"title": "Embedded Lua templating",
+			"require": ["lua", "markup-templating"],
+			"owner": "RunDevelopment"
+		},
 		"erb": {
 			"title": "ERB",
 			"require": ["ruby", "markup-templating"],

components/prism-etlua.js

@@ -0,0 +1,23 @@
+(function (Prism) {
+
+	Prism.languages.etlua = {
+		'delimiter': {
+			pattern: /^<%[-=]?|-?%>$/,
+			alias: 'punctuation'
+		},
+		'language-lua': {
+			pattern: /[\s\S]+/,
+			inside: Prism.languages.lua
+		}
+	};
+
+	Prism.hooks.add('before-tokenize', function (env) {
+		var pattern = /<%[\s\S]+?%>/g;
+		Prism.languages['markup-templating'].buildPlaceholders(env, 'etlua', pattern);
+	});
+
+	Prism.hooks.add('after-tokenize', function (env) {
+		Prism.languages['markup-templating'].tokenizePlaceholders(env, 'etlua');
+	});
+
+}(Prism));

examples/prism-etlua.html

@@ -0,0 +1,12 @@
+<h2>Full example</h2>
+<pre><code>&lt;div class="foo">
+	&lt;% if true then %>
+		Hello &lt;%= name %>,
+		Here are your items:
+		&lt;% for i, item in pairs(items) do %>
+			 * &lt;%= item -%>
+			&lt;% --[[ comment block ]] %>
+		&lt;% end %>
+		&lt;%- "&lt;b>this is not escaped&lt;/b>" %>
+	&lt;% end %>
+&lt;/div></code></pre>

plugins/autoloader/prism-autoloader.js

@@ -26,6 +26,10 @@
 			"javascript",
 			"markup-templating"
 		],
+		"etlua": [
+			"lua",
+			"markup-templating"
+		],
 		"erb": [
 			"ruby",
 			"markup-templating"

plugins/show-language/prism-show-language.js

@@ -53,6 +53,7 @@
 		"dockerfile": "Docker",
 		"ebnf": "Extended Backus–Naur form",
 		"ejs": "EJS",
+		"etlua": "Embedded Lua templating",
 		"erb": "ERB",
 		"fsharp": "F#",
 		"firestore-security-rules": "Firestore security rules",

tests/languages/etlua/delimiter_feature.test

@@ -0,0 +1,41 @@
+<% lua_code %>
+<%= lua_expression %>
+<%- lua_expression %>
+<%= 'hello' -%>
+
+----------------------------------------------------
+
+[
+	["etlua", [
+		["delimiter", "<%"],
+		["language-lua", [
+			" lua_code "
+		]],
+		["delimiter", "%>"]
+	]],
+	["etlua", [
+		["delimiter", "<%="],
+		["language-lua", [
+			" lua_expression "
+		]],
+		["delimiter", "%>"]
+	]],
+	["etlua", [
+		["delimiter", "<%-"],
+		["language-lua", [
+			" lua_expression "
+		]],
+		["delimiter", "%>"]
+	]],
+	["etlua", [
+		["delimiter", "<%="],
+		["language-lua", [
+			["string", "'hello'"]
+		]],
+		["delimiter", "-%>"]
+	]]
+]
+
+----------------------------------------------------
+
+Checks for different delimiters.