Added support for ICU message format

components.json

@@ -528,6 +528,10 @@
 			"title": "Icon",
 			"owner": "Golmote"
 		},
+		"icu-message-format": {
+			"title": "ICU Message Format",
+			"owner": "RunDevelopment"
+		},
 		"idris": {
 			"title": "Idris",
 			"alias": "idr",

components/prism-icu-message-format.js

@@ -0,0 +1,148 @@
+// https://unicode-org.github.io/icu/userguide/format_parse/messages/
+// https://unicode-org.github.io/icu-docs/apidoc/released/icu4j/com/ibm/icu/text/MessageFormat.html
+
+(function (Prism) {
+
+	/**
+	 * @param {string} source
+	 * @param {number} level
+	 * @returns {string}
+	 */
+	function nested(source, level) {
+		if (level <= 0) {
+			return /[]/.source;
+		} else {
+			return source.replace(/<SELF>/g, function () { return nested(source, level - 1) });
+		}
+	}
+
+	var stringPattern = /'[{}:=,](?:[^']|'')*'(?!')/;
+
+	var escape = {
+		pattern: /''/,
+		greedy: true,
+		alias: 'operator'
+	};
+	var string = {
+		pattern: stringPattern,
+		greedy: true,
+		inside: {
+			'escape': escape
+		}
+	};
+
+	var argumentSource = nested(
+		/\{(?:[^{}']|'(?![{},'])|''|<STR>|<SELF>)*\}/.source
+			.replace(/<STR>/g, function () { return stringPattern.source; }),
+		8
+	);
+
+	var nestedMessage = {
+		pattern: RegExp(argumentSource),
+		inside: {
+			'message': {
+				pattern: /^(\{)[\s\S]+(?=\}$)/,
+				lookbehind: true,
+				inside: null // see below
+			},
+			'message-delimiter': {
+				pattern: /./,
+				alias: 'punctuation'
+			}
+		}
+	};
+
+	Prism.languages['icu-message-format'] = {
+		'argument': {
+			pattern: RegExp(argumentSource),
+			greedy: true,
+			inside: {
+				'content': {
+					pattern: /^(\{)[\s\S]+(?=\}$)/,
+					lookbehind: true,
+					inside: {
+						'argument-name': {
+							pattern: /^(\s*)[^{}:=,\s]+/,
+							lookbehind: true
+						},
+						'choice-style': {
+							// https://unicode-org.github.io/icu-docs/apidoc/released/icu4c/classicu_1_1ChoiceFormat.html#details
+							pattern: /^(\s*,\s*choice\s*,\s*)\S(?:[\s\S]*\S)?/,
+							lookbehind: true,
+							inside: {
+								'punctuation': /\|/,
+								'range': {
+									pattern: /^(\s*)[+-]?(?:\d+(?:\.\d*)?|\u221e)\s*[<#\u2264]/,
+									lookbehind: true,
+									inside: {
+										'operator': /[<#\u2264]/,
+										'number': /\S+/
+									}
+								},
+								rest: null // see below
+							}
+						},
+						'plural-style': {
+							// https://unicode-org.github.io/icu-docs/apidoc/released/icu4j/com/ibm/icu/text/PluralFormat.html#:~:text=Patterns%20and%20Their%20Interpretation
+							pattern: /^(\s*,\s*(?:plural|selectordinal)\s*,\s*)\S(?:[\s\S]*\S)?/,
+							lookbehind: true,
+							inside: {
+								'offset': /^offset:\s*\d+/,
+								'nested-message': nestedMessage,
+								'selector': {
+									pattern: /=\d+|[^{}:=,\s]+/,
+									inside: {
+										'keyword': /^(?:zero|one|two|few|many|other)$/
+									}
+								}
+							}
+						},
+						'select-style': {
+							// https://unicode-org.github.io/icu-docs/apidoc/released/icu4j/com/ibm/icu/text/SelectFormat.html#:~:text=Patterns%20and%20Their%20Interpretation
+							pattern: /^(\s*,\s*select\s*,\s*)\S(?:[\s\S]*\S)?/,
+							lookbehind: true,
+							inside: {
+								'nested-message': nestedMessage,
+								'selector': {
+									pattern: /[^{}:=,\s]+/,
+									inside: {
+										'keyword': /^other$/
+									}
+								}
+							}
+						},
+						'keyword': /\b(?:choice|plural|select|selectordinal)\b/,
+						'arg-type': {
+							pattern: /\b(?:number|date|time|spellout|ordinal|duration)\b/,
+							alias: 'keyword'
+						},
+						'arg-skeleton': {
+							pattern: /(,\s*)::[^{}:=,\s]+/,
+							lookbehind: true
+						},
+						'arg-style': {
+							pattern: /(,\s*)(?:short|medium|long|full|integer|currency|percent)(?=\s*$)/,
+							lookbehind: true
+						},
+						'arg-style-text': {
+							pattern: RegExp(/(^\s*,\s*(?=\S))/.source + nested(/(?:[^{}']|'[^']*'|\{(?:<SELF>)?\})+/.source, 8) + '$'),
+							lookbehind: true,
+							alias: 'string'
+						},
+						'punctuation': /,/
+					}
+				},
+				'argument-delimiter': {
+					pattern: /./,
+					alias: 'operator'
+				}
+			}
+		},
+		'escape': escape,
+		'string': string
+	};
+
+	nestedMessage.inside.message.inside = Prism.languages['icu-message-format'];
+	Prism.languages['icu-message-format'].argument.inside.content.inside['choice-style'].inside.rest = Prism.languages['icu-message-format'];
+
+}(Prism));

examples/prism-icu-message-format.html

@@ -0,0 +1,22 @@
+<h2>Full example</h2>
+<pre><code>https://unicode-org.github.io/icu/userguide/format_parse/messages/
+
+{gender_of_host, select,
+  female {
+    {num_guests, plural, offset:1
+      =0 {{host} does not give a party.}
+      =1 {{host} invites {guest} to her party.}
+      =2 {{host} invites {guest} and one other person to her party.}
+      other {{host} invites {guest} and # other people to her party.}}}
+  male {
+    {num_guests, plural, offset:1
+      =0 {{host} does not give a party.}
+      =1 {{host} invites {guest} to his party.}
+      =2 {{host} invites {guest} and one other person to his party.}
+      other {{host} invites {guest} and # other people to his party.}}}
+  other {
+    {num_guests, plural, offset:1
+      =0 {{host} does not give a party.}
+      =1 {{host} invites {guest} to their party.}
+      =2 {{host} invites {guest} and one other person to their party.}
+      other {{host} invites {guest} and # other people to their party.}}}}</code></pre>

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

@@ -89,6 +89,7 @@
 		"hpkp": "HTTP Public-Key-Pins",
 		"hsts": "HTTP Strict-Transport-Security",
 		"ichigojam": "IchigoJam",
+		"icu-message-format": "ICU Message Format",
 		"idr": "Idris",
 		"ignore": ".ignore",
 		"gitignore": ".gitignore",

tests/languages/icu-message-format/arg-skeleton_feature.test

@@ -0,0 +1,51 @@
+At {1,time,::jmm} on {1,date,::dMMMM}, there was {2} on planet {3,number,integer}.
+
+----------------------------------------------------
+
+[
+	"At ",
+	["argument", [
+		["argument-delimiter", "{"],
+		["content", [
+			["argument-name", "1"],
+			["punctuation", ","],
+			["arg-type", "time"],
+			["punctuation", ","],
+			["arg-skeleton", "::jmm"]
+		]],
+		["argument-delimiter", "}"]
+	]],
+	" on ",
+	["argument", [
+		["argument-delimiter", "{"],
+		["content", [
+			["argument-name", "1"],
+			["punctuation", ","],
+			["arg-type", "date"],
+			["punctuation", ","],
+			["arg-skeleton", "::dMMMM"]
+		]],
+		["argument-delimiter", "}"]
+	]],
+	", there was ",
+	["argument", [
+		["argument-delimiter", "{"],
+		["content", [
+			["argument-name", "2"]
+		]],
+		["argument-delimiter", "}"]
+	]],
+	" on planet ",
+	["argument", [
+		["argument-delimiter", "{"],
+		["content", [
+			["argument-name", "3"],
+			["punctuation", ","],
+			["arg-type", "number"],
+			["punctuation", ","],
+			["arg-style", "integer"]
+		]],
+		["argument-delimiter", "}"]
+	]],
+	"."
+]

tests/languages/icu-message-format/choice-style_feature.test

@@ -0,0 +1,105 @@
+The disk {1} contains {0,choice,0#no files|1#one file|1<{0,number,integer} files}
+
+{3, choice, -1#is negative| 0#is zero or fraction | 1#is one |1.0<is 1+ |2#is two |2<is more than 2.}
+
+----------------------------------------------------
+
+[
+	"The disk ",
+	["argument", [
+		["argument-delimiter", "{"],
+		["content", [
+			["argument-name", "1"]
+		]],
+		["argument-delimiter", "}"]
+	]],
+	" contains ",
+	["argument", [
+		["argument-delimiter", "{"],
+		["content", [
+			["argument-name", "0"],
+			["punctuation", ","],
+			["keyword", "choice"],
+			["punctuation", ","],
+			["choice-style", [
+				["range", [
+					["number", "0"],
+					["operator", "#"]
+				]],
+				"no files",
+				["punctuation", "|"],
+				["range", [
+					["number", "1"],
+					["operator", "#"]
+				]],
+				"one file",
+				["punctuation", "|"],
+				["range", [
+					["number", "1"],
+					["operator", "<"]
+				]],
+				["argument", [
+					["argument-delimiter", "{"],
+					["content", [
+						["argument-name", "0"],
+						["punctuation", ","],
+						["arg-type", "number"],
+						["punctuation", ","],
+						["arg-style", "integer"]
+					]],
+					["argument-delimiter", "}"]
+				]],
+				" files"
+			]]
+		]],
+		["argument-delimiter", "}"]
+	]],
+
+	["argument", [
+		["argument-delimiter", "{"],
+		["content", [
+			["argument-name", "3"],
+			["punctuation", ","],
+			["keyword", "choice"],
+			["punctuation", ","],
+			["choice-style", [
+				["range", [
+					["number", "-1"],
+					["operator", "#"]
+				]],
+				"is negative",
+				["punctuation", "|"],
+				["range", [
+					["number", "0"],
+					["operator", "#"]
+				]],
+				"is zero or fraction ",
+				["punctuation", "|"],
+				["range", [
+					["number", "1"],
+					["operator", "#"]
+				]],
+				"is one ",
+				["punctuation", "|"],
+				["range", [
+					["number", "1.0"],
+					["operator", "<"]
+				]],
+				"is 1+ ",
+				["punctuation", "|"],
+				["range", [
+					["number", "2"],
+					["operator", "#"]
+				]],
+				"is two ",
+				["punctuation", "|"],
+				["range", [
+					["number", "2"],
+					["operator", "<"]
+				]],
+				"is more than 2."
+			]]
+		]],
+		["argument-delimiter", "}"]
+	]]
+]