Added support for Web IDL

components.json

@@ -1424,6 +1424,11 @@
 			"title": "WebAssembly",
 			"owner": "Golmote"
 		},
+		"web-idl": {
+			"title": "Web IDL",
+			"alias": "webidl",
+			"owner": "RunDevelopment"
+		},
 		"wiki": {
 			"title": "Wiki markup",
 			"require": "markup",

components/prism-web-idl.js

@@ -0,0 +1,101 @@
+(function (Prism) {
+
+	var id = /(?:\B-|\b_|\b)[A-Za-z][\w-]*(?![\w-])/.source;
+	var type =
+		'(?:' +
+		/\b(?:unsigned\s+)?long\s+long(?![\w-])/.source +
+		'|' +
+		/\b(?:unrestricted|unsigned)\s+[a-z]+(?![\w-])/.source +
+		'|' +
+		/(?!(?:unrestricted|unsigned)\b)/.source + id + /(?:\s*<(?:[^<>]|<[^<>]*>)*>)?/.source +
+		')' + /(?:\s*\?)?/.source;
+
+	var typeInside = {};
+
+	Prism.languages['web-idl'] = {
+		'comment': {
+			pattern: /\/\/.*|\/\*[\s\S]*?\*\//,
+			greedy: true
+		},
+		'string': {
+			pattern: /"[^"]*"/,
+			greedy: true
+		},
+
+		'namespace': {
+			pattern: RegExp(/(\bnamespace\s+)/.source + id),
+			lookbehind: true,
+		},
+		'class-name': [
+			{
+				pattern: /(^|[^\w-])(?:iterable|maplike|setlike)\s*<(?:[^<>]|<[^<>]*>)*>/,
+				lookbehind: true,
+				inside: typeInside
+			},
+			{
+				pattern: RegExp(/(\b(?:attribute|const|deleter|getter|optional|setter)\s+)/.source + type),
+				lookbehind: true,
+				inside: typeInside
+			},
+			{
+				// callback return type
+				pattern: RegExp('(' + /\bcallback\s+/.source + id + /\s*=\s*/.source + ')' + type),
+				lookbehind: true,
+				inside: typeInside
+			},
+			{
+				// typedef
+				pattern: RegExp(/(\btypedef\b\s*)/.source + type),
+				lookbehind: true,
+				inside: typeInside
+			},
+
+			{
+				pattern: RegExp(/(\b(?:callback|dictionary|enum|interface(?:\s+mixin)?)\s+)(?!(?:interface|mixin)\b)/.source + id),
+				lookbehind: true,
+			},
+			{
+				// inheritance
+				pattern: RegExp(/(:\s*)/.source + id),
+				lookbehind: true,
+			},
+
+			// includes and implements
+			RegExp(id + /(?=\s+(?:implements|includes)\b)/.source),
+			{
+				pattern: RegExp(/(\b(?:implements|includes)\s+)/.source + id),
+				lookbehind: true,
+			},
+
+			{
+				// function return type, parameter types, and dictionary members
+				pattern: RegExp(type + '(?=' + /\s*(?:\.{3}\s*)?/.source + id + /\s*[(),;=]/.source + ')'),
+				inside: typeInside
+			},
+		],
+
+		'builtin': /\b(?:ArrayBuffer|BigInt64Array|BigUint64Array|ByteString|DOMString|DataView|Float32Array|Float64Array|FrozenArray|Int16Array|Int32Array|Int8Array|ObservableArray|Promise|USVString|Uint16Array|Uint32Array|Uint8Array|Uint8ClampedArray)\b/,
+		'keyword': [
+			/\b(?:async|attribute|callback|const|constructor|deleter|dictionary|enum|getter|implements|includes|inherit|interface|mixin|namespace|null|optional|or|partial|readonly|required|setter|static|stringifier|typedef|unrestricted)\b/,
+			// type keywords
+			/\b(?:any|bigint|boolean|byte|double|float|iterable|long|maplike|object|octet|record|sequence|setlike|short|symbol|undefined|unsigned|void)\b/
+		],
+		'boolean': /\b(?:false|true)\b/,
+
+		'number': {
+			pattern: /(^|[^\w-])-?(?:0x[0-9a-f]+|(?:\d+(?:\.\d*)?|\.\d+)(?:e[+-]?\d+)?|NaN|Infinity)(?![\w-])/i,
+			lookbehind: true
+		},
+		'operator': /\.{3}|[=:?<>-]/,
+		'punctuation': /[(){}[\].,;]/
+	};
+
+	for (var key in Prism.languages['web-idl']) {
+		if (key !== 'class-name') {
+			typeInside[key] = Prism.languages['web-idl'][key];
+		}
+	}
+
+	Prism.languages['webidl'] = Prism.languages['web-idl'];
+
+}(Prism));

examples/prism-web-idl.html

@@ -0,0 +1,28 @@
+<h2>Full example</h2>
+<pre><code>[Exposed=Window]
+interface Paint { };
+
+[Exposed=Window]
+interface SolidColor : Paint {
+	attribute double red;
+	attribute double green;
+	attribute double blue;
+};
+
+[Exposed=Window]
+interface Pattern : Paint {
+	attribute DOMString imageURL;
+};
+
+[Exposed=Window]
+interface GraphicalWindow {
+	constructor();
+	readonly attribute unsigned long width;
+	readonly attribute unsigned long height;
+
+	attribute Paint currentPaint;
+
+	undefined drawRectangle(double x, double y, double width, double height);
+
+	undefined drawText(double x, double y, DOMString text);
+};</code></pre>

plugins/autoloader/prism-autoloader.js

@@ -250,6 +250,7 @@
 		"url": "uri",
 		"vb": "visual-basic",
 		"vba": "visual-basic",
+		"webidl": "web-idl",
 		"mathematica": "wolfram",
 		"nb": "wolfram",
 		"wl": "wolfram",

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

@@ -246,6 +246,8 @@
 		"vba": "VBA",
 		"vb": "Visual Basic",
 		"wasm": "WebAssembly",
+		"web-idl": "Web IDL",
+		"webidl": "Web IDL",
 		"wiki": "Wiki markup",
 		"wolfram": "Wolfram language",
 		"nb": "Mathematica Notebook",