PrismJS · RunDevelopment · Jul 21, 2019 · May 14, 2019 · May 14, 2019 · May 14, 2019
diff --git a/components.js b/components.js
diff --git a/components.json b/components.json
@@ -1078,6 +1078,11 @@
 			"owner": "mAAdhaTTah",
 			"require": "toolbar",
 			"noCSS": true
+		},
+		"diff-highlight": {
+			"title": "Diff Highlight",
+			"owner": "RunDevelopment",
+			"require": "diff"
 		}
 	}
 }
diff --git a/components/prism-diff.js b/components/prism-diff.js
@@ -1,20 +1,54 @@
-Prism.languages.diff = {
-	'coord': [
-		// Match all kinds of coord lines (prefixed by "+++", "---" or "***").
-		/^(?:\*{3}|-{3}|\+{3}).*$/m,
-		// Match "@@ ... @@" coord lines in unified diff.
-		/^@@.*@@$/m,
-		// Match coord lines in normal diff (starts with a number).
-		/^\d+.*$/m
-	],
-
-	// Match inserted and deleted lines. Support both +/- and >/< styles.
-	'deleted': /^[-<].*$/m,
-	'inserted': /^[+>].*$/m,
-
-	// Match "different" lines (prefixed with "!") in context diff.
-	'diff': {
-		'pattern': /^!(?!!).+$/m,
-		'alias': 'important'
-	}
-};
+(function (Prism) {
+
+	Prism.languages.diff = {
+		'coord': [
+			// Match all kinds of coord lines (prefixed by "+++", "---" or "***").
+			/^(?:\*{3}|-{3}|\+{3}).*$/m,
+			// Match "@@ ... @@" coord lines in unified diff.
+			/^@@.*@@$/m,
+			// Match coord lines in normal diff (starts with a number).
+			/^\d+.*$/m
+		]
+
+		// deleted, inserted, unchanged, diff
+	};
+
+	/**
+	 * A map from the name of a block to its line prefix.
+	 *
+	 * @type {Object<string, string>}
+	 */
+	var PREFIXES = {
+		'deleted-sign': '-',
+		'deleted-arrow': '<',
+		'inserted-sign': '+',
+		'inserted-arrow': '>',
+		'unchanged': ' ',
+		'diff': '!',
+	};
+
+	// add a token for each prefix
+	Object.keys(PREFIXES).forEach(function (name) {
+		var prefix = PREFIXES[name];
+
+		var alias = [];
+		if (!/^\w+$/.test(name)) { // "deleted-sign" -> "deleted"
+			alias.push(/\w+/.exec(name)[0]);
+		}
+		if (name === "diff") {
+			alias.push("bold");
+		}
+
+		Prism.languages.diff[name] = {
+			// pattern: /^(?:[_].*(?:\r\n?|\n|(?![\s\S])))+/m
+			pattern: RegExp('^(?:[' + prefix + '].*(?:\r\n?|\n|(?![\\s\\S])))+', 'm'),
+			alias: alias
+		};
+	});
+
+	// make prefixes available to Diff plugin
+	Object.defineProperty(Prism.languages.diff, 'PREFIXES', {
+		value: PREFIXES
+	});
+
+}(Prism));
diff --git a/components/prism-diff.min.js b/components/prism-diff.min.js
diff --git a/examples/prism-diff.html b/examples/prism-diff.html
@@ -30,4 +30,4 @@ <h2>Unified Diff</h2>
      headers: "src/*.h"
 -    qt: core
 +    qt: core gui
- public_headers: "src/*.h"</code></pre>
+ public_headers: "src/*.h"</code></pre>
diff --git a/plugins/diff-highlight/index.html b/plugins/diff-highlight/index.html
@@ -0,0 +1,85 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+	<meta charset="utf-8" />
+	<link rel="icon" href="favicon.png" />
+	<title>Data-URI Highlight ▲ Prism plugins</title>
+	<base href="../.." />
+	<link rel="stylesheet" href="style.css" />
+	<link rel="stylesheet" href="themes/prism.css" data-noprefix />
+	<link rel="stylesheet" href="plugins/diff-highlight/prism-diff-highlight.css" data-noprefix />
+	<script src="scripts/prefixfree.min.js"></script>
+
+	<script>var _gaq = [['_setAccount', 'UA-33746269-1'], ['_trackPageview']];</script>
+	<script src="https://www.google-analytics.com/ga.js" async></script>
+</head>
+
+<body class="language-none">
+
+	<header>
+		<div class="intro" data-src="templates/header-plugins.html" data-type="text/html"></div>
+
+		<h2>Diff Highlight</h2>
+		<p>Highlights the code inside diff blocks.</p>
+	</header>
+
+	<section>
+		<h1>How to use</h1>
+
+		<p>Replace the <code>language-diff</code> of your code block with a <code>language-diff-xxxx</code> class to enable syntax highlighting for diff blocks.</p>
+
+		<p>Optional:<br>
+			You can add the <code>diff-highlight</code> class to your code block to indicate changes using the background color of a line rather than the color of the text.<br>
+			This is not compatible with the Funky theme.</p>
+	</section>
+
+	<section>
+		<h1>Example</h1>
+
+		<p>Using <code>class="language-diff"</code>:</p>
+
+		<pre><code class="language-diff">@@ -4,6 +4,5 @@
+-    let foo = bar.baz([1, 2, 3]);
+-    foo = foo + 1;
++    const foo = bar.baz([1, 2, 3]) + 1;
+     console.log(`foo: ${foo}`);</code></pre>
+
+		<p>Using <code>class="language-diff diff-highlight"</code>:</p>
+
+		<pre><code class="language-diff diff-highlight">@@ -4,6 +4,5 @@
+-    let foo = bar.baz([1, 2, 3]);
+-    foo = foo + 1;
++    const foo = bar.baz([1, 2, 3]) + 1;
+     console.log(`foo: ${foo}`);</code></pre>
+
+		<p>Using <code>class="language-diff-javascript"</code>:</p>
+
+		<pre><code class="language-diff-javascript">@@ -4,6 +4,5 @@
+-    let foo = bar.baz([1, 2, 3]);
+-    foo = foo + 1;
++    const foo = bar.baz([1, 2, 3]) + 1;
+     console.log(`foo: ${foo}`);</code></pre>
+
+		<p>Using <code>class="language-diff-javascript diff-highlight"</code>:</p>
+
+		<pre><code class="language-diff-javascript diff-highlight">@@ -4,6 +4,5 @@
+-    let foo = bar.baz([1, 2, 3]);
+-    foo = foo + 1;
++    const foo = bar.baz([1, 2, 3]) + 1;
+     console.log(`foo: ${foo}`);</code></pre>
+
+	</section>
+
+	<footer data-src="templates/footer.html" data-type="text/html"></footer>
+
+	<script src="prism.js"></script>
+	<script src="components/prism-diff.js"></script>
+	<script src="plugins/diff-highlight/prism-diff-highlight.js"></script>
+	<script src="scripts/utopia.js"></script>
+	<script src="components.js"></script>
+	<script src="scripts/code.js"></script>
+
+</body>
+
+</html>
diff --git a/plugins/diff-highlight/prism-diff-highlight.css b/plugins/diff-highlight/prism-diff-highlight.css
@@ -0,0 +1,13 @@
+pre.diff-highlight > code .token.deleted:not(.prefix),
+pre > code.diff-highlight .token.deleted:not(.prefix) {
+	background-color: rgba(255, 0, 0, .1);
+	color: inherit;
+	display: block;
+}
+
+pre.diff-highlight > code .token.inserted:not(.prefix),
+pre > code.diff-highlight .token.inserted:not(.prefix) {
+	background-color: rgba(0, 255, 128, .1);
+	color: inherit;
+	display: block;
+}
diff --git a/plugins/diff-highlight/prism-diff-highlight.js b/plugins/diff-highlight/prism-diff-highlight.js
@@ -0,0 +1,83 @@
+(function () {
+
+	if (typeof Prism === 'undefined' || !Prism.languages['diff']) {
+		return;
+	}
+
+
+	var LANGUAGE_REGEX = /diff-([\w-]+)/i;
+	var HTML_TAG = /<\/?(?!\d)[^\s>\/=$<%]+(?:\s(?:\s*[^\s>\/=]+(?:\s*=\s*(?:"[^"]*"|'[^']*'|[^\s'">=]+(?=[\s>]))|(?=[\s/>])))+)?\s*\/?>/gi;
+	//this will match a line plus the line break while ignoring the line breaks HTML tags may contain.
+	var HTML_LINE = RegExp(/(?:__|[^\r\n<])*(?:\r\n?|\n|(?:__|[^\r\n<])(?![^\r\n]))/.source.replace(/__/g, HTML_TAG.source), 'gi');
+
+	var PREFIXES = Prism.languages.diff.PREFIXES;
+
+
+	Prism.hooks.add('before-sanity-check', function (env) {
+		var lang = env.language;
+		if (LANGUAGE_REGEX.test(lang) && !env.grammar) {
+			env.grammar = Prism.languages[lang] = Prism.languages['diff'];
+		}
+	});
+	Prism.hooks.add('before-tokenize', function (env) {
+		var lang = env.language;
+		if (LANGUAGE_REGEX.test(lang) && !Prism.languages[lang]) {
+			Prism.languages[lang] = Prism.languages['diff'];
+		}
+	});
+
+	Prism.hooks.add('wrap', function (env) {
+		var diffLanguage, diffGrammar;
+
+		if (env.language !== 'diff') {
+			var langMatch = LANGUAGE_REGEX.exec(env.language);
+			if (!langMatch) {
+				return; // not a language specific diff
+			}
+
+			diffLanguage = langMatch[1];
+			diffGrammar = Prism.languages[diffLanguage];
+		}
+
+		// one of the diff tokens without any nested tokens
+		if (env.type in PREFIXES) {
+			/** @type {string} */
+			var content = env.content.replace(HTML_TAG, ''); // remove all HTML tags
+
+			/** @type {string} */
+			var decoded = content.replace(/&lt;/g, '<').replace(/&amp;/g, '&');
+
+			// remove any one-character prefix
+			var code = decoded.replace(/(^|[\r\n])./g, '$1');
+
+			// highlight, if possible
+			var highlighted;
+			if (diffGrammar) {
+				highlighted = Prism.highlight(code, diffGrammar, diffLanguage);
+			} else {
+				highlighted = Prism.util.encode(code);
+			}
+
+			// get the HTML source of the prefix token
+			var prefixToken = new Prism.Token('prefix', PREFIXES[env.type], [/\w+/.exec(env.type)[0]]);
+			var prefix = Prism.Token.stringify(prefixToken, env.language);
+
+			// add prefix
+			var lines = [], m;
+			HTML_LINE.lastIndex = 0;
+			while (m = HTML_LINE.exec(highlighted)) {
+				lines.push(prefix + m[0]);
+			}
+			if (/(?:^|[\r\n]).$/.test(decoded)) {
+				// because both "+a\n+" and "+a\n" will map to "a\n" after the line prefixes are removed
+				lines.push(prefix);
+			}
+			env.content = lines.join('');
+
+			if (diffGrammar) {
+				env.classes.push('language-' + diffLanguage);
+			}
+		}
+	});
+
+}());
diff --git a/plugins/diff-highlight/prism-diff-highlight.min.js b/plugins/diff-highlight/prism-diff-highlight.min.js
diff --git a/tests/languages/diff/diff_feature.test b/tests/languages/diff/diff_feature.test
@@ -1,5 +1,7 @@
 !     qt: core
 
+  unchanged
+
 -    qt: core
 +    qt: core gui
 
@@ -9,13 +11,14 @@
 ----------------------------------------------------
 
 [
-	["diff", "!     qt: core"],
-	["deleted", "-    qt: core"],
-	["inserted", "+    qt: core gui"],
-	["deleted", "< qt: core"],
-	["inserted", "> qt: core quick"]
+	["diff", "!     qt: core\r\n"],
+	["unchanged", "  unchanged\r\n"],
+	["deleted-sign", "-    qt: core\r\n"],
+	["inserted-sign", "+    qt: core gui\r\n"],
+	["deleted-arrow", "< qt: core\r\n"],
+	["inserted-arrow", "> qt: core quick"]
 ]
 
 ----------------------------------------------------
 
-Checks for deleted, inserted and different lines.
+Checks for deleted, inserted and different lines.