Swift: Major improvements (#3022)

components.json

@@ -1221,7 +1221,6 @@
 		},
 		"swift": {
 			"title": "Swift",
-			"require": "clike",
 			"owner": "chrischares"
 		},
 		"t4-templating": {

components/prism-swift.js

@@ -1,25 +1,148 @@
-// issues: nested multiline comments
-Prism.languages.swift = Prism.languages.extend('clike', {
-	'string': {
-		pattern: /("|')(?:\\(?:\((?:[^()]|\([^)]+\))+\)|\r\n|[^(])|(?!\1)[^\\\r\n])*\1/,
-		greedy: true,
-		inside: {
-			'interpolation': {
-				pattern: /\\\((?:[^()]|\([^)]+\))+\)/,
-				inside: {
-					delimiter: {
-						pattern: /^\\\(|\)$/,
-						alias: 'variable'
-					}
-					// See rest below
-				}
+Prism.languages.swift = {
+	'comment': {
+		// Nested comments are supported up to 2 levels
+		pattern: /(^|[^\\:])(?:\/\/.*|\/\*(?:[^/*]|\/(?!\*)|\*(?!\/)|\/\*(?:[^*]|\*(?!\/))*\*\/)*\*\/)/,
+		lookbehind: true,
+		greedy: true
+	},
+	'string-literal': [
+		// https://docs.swift.org/swift-book/LanguageGuide/StringsAndCharacters.html
+		{
+			pattern: RegExp(
+				/(^|[^"#])/.source
+				+ '(?:'
+				// single-line string
+				+ /"(?:\\(?:\((?:[^()]|\([^()]*\))*\)|\r\n|[^(])|[^\\\r\n"])*"/.source
+				+ '|'
+				// multi-line string
+				+ /"""(?:\\(?:\((?:[^()]|\([^()]*\))*\)|[^(])|[^\\"]|"(?!""))*"""/.source
+				+ ')'
+				+ /(?!["#])/.source
+			),
+			lookbehind: true,
+			greedy: true,
+			inside: {
+				'interpolation': {
+					pattern: /(\\\()(?:[^()]|\([^()]*\))*(?=\))/,
+					lookbehind: true,
+					inside: null // see below
+				},
+				'interpolation-punctuation': {
+					pattern: /^\)|\\\($/,
+					alias: 'punctuation'
+				},
+				'punctuation': /\\(?=[\r\n])/,
+				'string': /[\s\S]+/
+			}
+		},
+		{
+			pattern: RegExp(
+				/(^|[^"#])(#+)/.source
+				+ '(?:'
+				// single-line string
+				+ /"(?:\\(?:#+\((?:[^()]|\([^()]*\))*\)|\r\n|[^#])|[^\\\r\n])*?"/.source
+				+ '|'
+				// multi-line string
+				+ /"""(?:\\(?:#+\((?:[^()]|\([^()]*\))*\)|[^#])|[^\\])*?"""/.source
+				+ ')'
+				+ '\\2'
+			),
+			lookbehind: true,
+			greedy: true,
+			inside: {
+				'interpolation': {
+					pattern: /(\\#+\()(?:[^()]|\([^()]*\))*(?=\))/,
+					lookbehind: true,
+					inside: null // see below
+				},
+				'interpolation-punctuation': {
+					pattern: /^\)|\\#+\($/,
+					alias: 'punctuation'
+				},
+				'string': /[\s\S]+/
 			}
+		},
+	],
+
+	'directive': {
+		// directives with conditions
+		pattern: RegExp(
+			/#/.source
+			+ '(?:'
+			+ (
+				/(?:elseif|if)\b/.source
+				+ '(?:[ \t]*'
+				// This regex is a little complex. It's equivalent to this:
+				//   (?:![ \t]*)?(?:\b\w+\b(?:[ \t]*<round>)?|<round>)(?:[ \t]*(?:&&|\|\|))?
+				// where <round> is a general parentheses expression.
+				+ /(?:![ \t]*)?(?:\b\w+\b(?:[ \t]*\((?:[^()]|\([^()]*\))*\))?|\((?:[^()]|\([^()]*\))*\))(?:[ \t]*(?:&&|\|\|))?/.source
+				+ ')+'
+			)
+			+ '|'
+			+ /(?:else|endif)\b/.source
+			+ ')'
+		),
+		alias: 'property',
+		inside: {
+			'directive-name': /^#\w+/,
+			'boolean': /\b(?:true|false)\b/,
+			'number': /\b\d+(?:\.\d+)*\b/,
+			'operator': /!|&&|\|\||[<>]=?/,
+			'punctuation': /[(),]/
 		}
 	},
-	'keyword': /\b(?:actor|as|associativity|async|await|break|case|catch|class|continue|convenience|default|defer|deinit|didSet|do|dynamic(?:Type)?|else|enum|extension|fallthrough|final|for|func|get|guard|if|import|in|infix|init|inout|internal|is|lazy|left|let|mutating|new|none|nonisolated|nonmutating|operator|optional|override|postfix|precedence|prefix|private|protocol|public|repeat|required|rethrows|return|right|safe|self|Self|set|some|static|struct|subscript|super|switch|throws?|try|Type|typealias|unowned|unsafe|var|weak|where|while|willSet|__(?:COLUMN__|FILE__|FUNCTION__|LINE__))\b/,
+	'literal': {
+		pattern: /#(?:colorLiteral|column|dsohandle|file(?:ID|Literal|Path)?|function|imageLiteral|line)\b/,
+		alias: 'constant'
+	},
+	'other-directive': {
+		pattern: /#\w+\b/,
+		alias: 'property'
+	},
+
+	'attribute': {
+		pattern: /@\w+/,
+		alias: 'atrule'
+	},
+
+	'function-definition': {
+		pattern: /(\bfunc\s+)\w+/,
+		lookbehind: true,
+		alias: 'function'
+	},
+	'label': {
+		// https://docs.swift.org/swift-book/LanguageGuide/ControlFlow.html#ID141
+		pattern: /\b(break|continue)\s+\w+|\b[a-zA-Z_]\w*(?=\s*:\s*(?:for|repeat|while)\b)/,
+		lookbehind: true,
+		alias: 'important'
+	},
+
+	'keyword': /\b(?:Any|Protocol|Self|Type|actor|as|assignment|associatedtype|associativity|async|await|break|case|catch|class|continue|convenience|default|defer|deinit|didSet|do|dynamic|else|enum|extension|fallthrough|fileprivate|final|for|func|get|guard|higherThan|if|import|in|indirect|infix|init|inout|internal|is|lazy|left|let|lowerThan|mutating|none|nonisolated|nonmutating|open|operator|optional|override|postfix|precedencegroup|prefix|private|protocol|public|repeat|required|rethrows|return|right|safe|self|set|some|static|struct|subscript|super|switch|throw|throws|try|typealias|unowned|unsafe|var|weak|where|while|willSet)\b/,
+	'boolean': /\b(?:true|false)\b/,
+	'nil': {
+		pattern: /\bnil\b/,
+		alias: 'constant'
+	},
+
+	'short-argument': /\$\d+\b/,
+	'omit': {
+		pattern: /\b_\b/,
+		alias: 'keyword'
+	},
 	'number': /\b(?:[\d_]+(?:\.[\de_]+)?|0x[a-f0-9_]+(?:\.[a-f0-9p_]+)?|0b[01_]+|0o[0-7_]+)\b/i,
-	'constant': /\b(?:nil|[A-Z_]{2,}|k[A-Z][A-Za-z_]+)\b/,
-	'atrule': /@\b(?:IB(?:Outlet|Designable|Action|Inspectable)|class_protocol|exported|globalActor|MainActor|noreturn|NS(?:Copying|Managed)|objc|propertyWrapper|UIApplicationMain|auto_closure)\b/,
-	'builtin': /\b(?:[A-Z]\S+|abs|advance|alignof(?:Value)?|assert|contains|count(?:Elements)?|debugPrint(?:ln)?|distance|drop(?:First|Last)|dump|enumerate|equal|filter|find|first|getVaList|indices|isEmpty|join|last|lexicographicalCompare|map|max(?:Element)?|min(?:Element)?|numericCast|overlaps|partition|print(?:ln)?|reduce|reflect|reverse|sizeof(?:Value)?|sort(?:ed)?|split|startsWith|stride(?:of(?:Value)?)?|suffix|swap|toDebugString|toString|transcode|underestimateCount|unsafeBitCast|with(?:ExtendedLifetime|Unsafe(?:MutablePointers?|Pointers?)|VaList))\b/
+
+	// A class name must start with an upper-case letter and be either 1 letter long or contain a lower-case letter.
+	'class-name': /\b[A-Z](?:[A-Z_\d]*[a-z]\w*)?\b/,
+	'function': /\b[a-z_]\w*(?=\s*\()/i,
+	'constant': /\b(?:[A-Z_]{2,}|k[A-Z][A-Za-z_]+)\b/,
+
+	// Operators are generic in Swift. Developers can even create new operators (e.g. +++).
+	// https://docs.swift.org/swift-book/ReferenceManual/zzSummaryOfTheGrammar.html#ID481
+	// This regex only supports ASCII operators.
+	'operator': /[-+*/%=!<>&|^~?]+|\.[.\-+*/%=!<>&|^~?]+/,
+	'punctuation': /[{}[\]();,.:\\]/
+};
+
+Prism.languages.swift['string-literal'].forEach(function (rule) {
+	rule.inside['interpolation'].inside = Prism.languages.swift;
 });
-Prism.languages.swift['string'].inside['interpolation'].inside.rest = Prism.languages.swift;

plugins/autoloader/prism-autoloader.js

@@ -135,7 +135,6 @@
 		"sparql": "turtle",
 		"sqf": "clike",
 		"squirrel": "clike",
-		"swift": "clike",
 		"t4-cs": [
 			"t4-templating",
 			"csharp"