prism-cpp.js

(function (Prism) {

	var keyword = /\b(?:alignas|alignof|asm|auto|bool|break|case|catch|char|char8_t|char16_t|char32_t|class|compl|concept|const|consteval|constexpr|constinit|const_cast|continue|co_await|co_return|co_yield|decltype|default|delete|do|double|dynamic_cast|else|enum|explicit|export|extern|final|float|for|friend|goto|if|import|inline|int|int8_t|int16_t|int32_t|int64_t|uint8_t|uint16_t|uint32_t|uint64_t|long|module|mutable|namespace|new|noexcept|nullptr|operator|override|private|protected|public|register|reinterpret_cast|requires|return|short|signed|sizeof|static|static_assert|static_cast|struct|switch|template|this|thread_local|throw|try|typedef|typeid|typename|union|unsigned|using|virtual|void|volatile|wchar_t|while)\b/;
	var modName = /\b(?!<keyword>)\w+(?:\s*\.\s*\w+)*\b/.source.replace(/<keyword>/g, function () { return keyword.source; });

	Prism.languages.cpp = Prism.languages.extend('c', {
		'class-name': [
			{
				pattern: RegExp(/(\b(?:class|concept|enum|struct|typename)\s+)(?!<keyword>)\w+/.source
					.replace(/<keyword>/g, function () { return keyword.source; })),
				lookbehind: true
			},
			// This is intended to capture the class name of method implementations like:
			//   void foo::bar() const {}
			// However! The `foo` in the above example could also be a namespace, so we only capture the class name if
			// it starts with an uppercase letter. This approximation should give decent results.
			/\b[A-Z]\w*(?=\s*::\s*\w+\s*\()/,
			// This will capture the class name before destructors like:
			//   Foo::~Foo() {}
			/\b[A-Z_]\w*(?=\s*::\s*~\w+\s*\()/i,
			// This also intends to capture the class name of method implementations but here the class has template
			// parameters, so it can't be a namespace (until C++ adds generic namespaces).
			/\b\w+(?=\s*<(?:[^<>]|<(?:[^<>]|<[^<>]*>)*>)*>\s*::\s*\w+\s*\()/
		],
		'keyword': keyword,
		'number': {
			pattern: /(?:\b0b[01']+|\b0x(?:[\da-f']+(?:\.[\da-f']*)?|\.[\da-f']+)(?:p[+-]?[\d']+)?|(?:\b[\d']+(?:\.[\d']*)?|\B\.[\d']+)(?:e[+-]?[\d']+)?)[ful]{0,4}/i,
			greedy: true
		},
		'operator': />>=?|<<=?|->|--|\+\+|&&|\|\||[?:~]|<=>|[-+*/%&|^!=<>]=?|\b(?:and|and_eq|bitand|bitor|not|not_eq|or|or_eq|xor|xor_eq)\b/,
		'boolean': /\b(?:true|false)\b/
	});

	Prism.languages.insertBefore('cpp', 'string', {
		'module': {
			// https://en.cppreference.com/w/cpp/language/modules
			pattern: RegExp(
				/(\b(?:module|import)\s+)/.source +
				'(?:' +
				// header-name
				/"(?:\\(?:\r\n|[\s\S])|[^"\\\r\n])*"|<[^<>\r\n]*>/.source +
				'|' +
				// module name or partition or both
				/<mod-name>(?:\s*:\s*<mod-name>)?|:\s*<mod-name>/.source.replace(/<mod-name>/g, function () { return modName; }) +
				')'
			),
			lookbehind: true,
			greedy: true,
			inside: {
				'string': /^[<"][\s\S]+/,
				'operator': /:/,
				'punctuation': /\./
			}
		},
		'raw-string': {
			pattern: /R"([^()\\ ]{0,16})\([\s\S]*?\)\1"/,
			alias: 'string',
			greedy: true
		}
	});

	Prism.languages.insertBefore('cpp', 'keyword', {
		'generic-function': {
			pattern: /\b(?!operator\b)[a-z_]\w*\s*<(?:[^<>]|<[^<>]*>)*>(?=\s*\()/i,
			inside: {
				'function': /^\w+/,
				'generic': {
					pattern: /<[\s\S]+/,
					alias: 'class-name',
					inside: Prism.languages.cpp
				}
			}
		}
	});

	Prism.languages.insertBefore('cpp', 'operator', {
		'double-colon': {
			pattern: /::/,
			alias: 'punctuation'
		}
	});

	Prism.languages.insertBefore('cpp', 'class-name', {
		// the base clause is an optional list of parent classes
		// https://en.cppreference.com/w/cpp/language/class
		'base-clause': {
			pattern: /(\b(?:class|struct)\s+\w+\s*:\s*)[^;{}"'\s]+(?:\s+[^;{}"'\s]+)*(?=\s*[;{])/,
			lookbehind: true,
			greedy: true,
			inside: Prism.languages.extend('cpp', {})
		}
	});

	Prism.languages.insertBefore('inside', 'double-colon', {
		// All untokenized words that are not namespaces should be class names
		'class-name': /\b[a-z_]\w*\b(?!\s*::)/i
	}, Prism.languages.cpp['base-clause']);

}(Prism));