Added support for Systemd configuration files (#3053)

components.json

@@ -1233,6 +1233,10 @@
 			"title": "Swift",
 			"owner": "chrischares"
 		},
+		"systemd": {
+			"title": "Systemd configuration file",
+			"owner": "RunDevelopment"
+		},
 		"t4-templating": {
 			"title": "T4 templating",
 			"owner": "RunDevelopment"

components/prism-systemd.js

@@ -0,0 +1,74 @@
+// https://www.freedesktop.org/software/systemd/man/systemd.syntax.html
+
+(function (Prism) {
+
+	var comment = {
+		pattern: /^[;#].*/m,
+		greedy: true
+	};
+
+	var quotesSource = /"(?:[^\r\n"\\]|\\(?:[^\r]|\r\n?))*"(?!\S)/.source;
+
+	Prism.languages.systemd = {
+		'comment': comment,
+
+		'section': {
+			pattern: /^\[[^\n\r\[\]]*\](?=[ \t]*$)/m,
+			greedy: true,
+			inside: {
+				'punctuation': /^\[|\]$/,
+				'section-name': {
+					pattern: /[\s\S]+/,
+					alias: 'selector'
+				},
+			}
+		},
+
+		'key': {
+			pattern: /^[^\s=]+(?=[ \t]*=)/m,
+			greedy: true,
+			alias: 'attr-name'
+		},
+		'value': {
+			// This pattern is quite complex because of two properties:
+			//  1) Quotes (strings) must be preceded by a space. Since we can't use lookbehinds, we have to "resolve"
+			//     the lookbehind. You will see this in the main loop where spaces are handled separately.
+			//  2) Line continuations.
+			//     After line continuations, empty lines and comments are ignored so we have to consume them.
+			pattern: RegExp(
+				/(=[ \t]*(?!\s))/.source +
+				// the value either starts with quotes or not
+				'(?:' + quotesSource + '|(?=[^"\r\n]))' +
+				// main loop
+				'(?:' + (
+					/[^\s\\]/.source +
+					// handle spaces separately because of quotes
+					'|' + '[ \t]+(?:(?![ \t"])|' + quotesSource + ')' +
+					// line continuation
+					'|' + /\\[\r\n]+(?:[#;].*[\r\n]+)*(?![#;])/.source
+				) +
+				')*'
+			),
+			lookbehind: true,
+			greedy: true,
+			alias: 'attr-value',
+			inside: {
+				'comment': comment,
+				'quoted': {
+					pattern: RegExp(/(^|\s)/.source + quotesSource),
+					lookbehind: true,
+					greedy: true,
+				},
+				'punctuation': /\\$/m,
+
+				'boolean': {
+					pattern: /^(?:false|no|off|on|true|yes)$/,
+					greedy: true
+				}
+			}
+		},
+
+		'operator': /=/
+	};
+
+}(Prism));

examples/prism-systemd.html

@@ -0,0 +1,20 @@
+<h2>Full example</h2>
+<pre><code># Source: https://www.freedesktop.org/software/systemd/man/systemd.syntax.html
+
+[Section A]
+KeyOne=value 1
+KeyTwo=value 2
+
+# a comment
+
+[Section B]
+Setting="something" "some thing" "…"
+KeyTwo=value 2 \
+       value 2 continued
+
+[Section C]
+KeyThree=value 3\
+# this line is ignored
+; this line is ignored too
+       value 3 continued
+</code></pre>

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

@@ -212,6 +212,7 @@
 		"sqf": "SQF: Status Quo Function (Arma 3)",
 		"sql": "SQL",
 		"iecst": "Structured Text (IEC 61131-3)",
+		"systemd": "Systemd configuration file",
 		"t4-templating": "T4 templating",
 		"t4-cs": "T4 Text Templates (C#)",
 		"t4": "T4 Text Templates (C#)",

tests/languages/systemd/boolean_feature.test

@@ -0,0 +1,46 @@
+foo=on
+foo=true
+foo=yes
+foo=off
+foo=false
+foo=no
+
+----------------------------------------------------
+
+[
+	["key", "foo"],
+	["operator", "="],
+	["value", [
+		["boolean", "on"]
+	]],
+
+	["key", "foo"],
+	["operator", "="],
+	["value", [
+		["boolean", "true"]
+	]],
+
+	["key", "foo"],
+	["operator", "="],
+	["value", [
+		["boolean", "yes"]
+	]],
+
+	["key", "foo"],
+	["operator", "="],
+	["value", [
+		["boolean", "off"]
+	]],
+
+	["key", "foo"],
+	["operator", "="],
+	["value", [
+		["boolean", "false"]
+	]],
+
+	["key", "foo"],
+	["operator", "="],
+	["value", [
+		["boolean", "no"]
+	]]
+]

tests/languages/systemd/comment_feature.test

@@ -0,0 +1,9 @@
+# comment
+; comment
+
+----------------------------------------------------
+
+[
+	["comment", "# comment"],
+	["comment", "; comment"]
+]

tests/languages/systemd/key_feature.test

@@ -0,0 +1,9 @@
+foo=
+foo  =
+
+----------------------------------------------------
+
+[
+	["key", "foo"], ["operator", "="],
+	["key", "foo"], ["operator", "="]
+]

tests/languages/systemd/section_feature.test

@@ -0,0 +1,11 @@
+[Section Foo]
+
+----------------------------------------------------
+
+[
+	["section", [
+		["punctuation", "["],
+		["section-name", "Section Foo"],
+		["punctuation", "]"]
+	]]
+]

tests/languages/systemd/value_feature.test

@@ -0,0 +1,49 @@
+foo=  value 2
+
+foo="something" "some thing" "…"
+foo=  "something" "some thing" "…"
+foo=value 2 \
+    value 2 continued
+
+foo=value 3\
+# this line is ignored
+; this line is ignored too
+       value 3 continued
+
+----------------------------------------------------
+
+[
+	["key", "foo"], ["operator", "="], ["value", ["value 2"]],
+
+	["key", "foo"],
+	["operator", "="],
+	["value", [
+		["quoted", "\"something\""],
+		["quoted", "\"some thing\""],
+		["quoted", "\"…\""]
+	]],
+
+	["key", "foo"],
+	["operator", "="],
+	["value", [
+		["quoted", "\"something\""],
+		["quoted", "\"some thing\""],
+		["quoted", "\"…\""]
+	]],
+
+	["key", "foo"],
+	["operator", "="],
+	["value", [
+		"value 2 ", ["punctuation", "\\"],
+		"\r\n    value 2 continued"
+	]],
+
+	["key", "foo"],
+	["operator", "="],
+	["value", [
+		"value 3", ["punctuation", "\\"],
+		["comment", "# this line is ignored"],
+		["comment", "; this line is ignored too"],
+		"\r\n       value 3 continued"
+	]]
+]