forgejo/vendor/github.com/alecthomas/chroma/lexers/c/cpp.go

package c

import (
	. "github.com/alecthomas/chroma" // nolint
	"github.com/alecthomas/chroma/lexers/internal"
)

// CPP lexer.
var CPP = internal.Register(MustNewLazyLexer(
	&Config{
		Name:      "C++",
		Aliases:   []string{"cpp", "c++"},
		Filenames: []string{"*.cpp", "*.hpp", "*.c++", "*.h++", "*.cc", "*.hh", "*.cxx", "*.hxx", "*.C", "*.H", "*.cp", "*.CPP"},
		MimeTypes: []string{"text/x-c++hdr", "text/x-c++src"},
		EnsureNL:  true,
	},
	cppRules,
))

func cppRules() Rules {
	return Rules{
		"statements": {
			{Words(``, `\b`, `catch`, `const_cast`, `delete`, `dynamic_cast`, `explicit`, `export`, `friend`, `mutable`, `namespace`, `new`, `operator`, `private`, `protected`, `public`, `reinterpret_cast`, `restrict`, `static_cast`, `template`, `this`, `throw`, `throws`, `try`, `typeid`, `typename`, `using`, `virtual`, `constexpr`, `nullptr`, `decltype`, `thread_local`, `alignas`, `alignof`, `static_assert`, `noexcept`, `override`, `final`, `concept`, `requires`, `consteval`, `co_await`, `co_return`, `co_yield`), Keyword, nil},
			{`(enum)\b(\s+)(class)\b(\s*)`, ByGroups(Keyword, Text, Keyword, Text), Push("classname")},
			{`(class|struct|enum|union)\b(\s*)`, ByGroups(Keyword, Text), Push("classname")},
			{`\[\[.+\]\]`, NameAttribute, nil},
			{`(R)(")([^\\()\s]{,16})(\()((?:.|\n)*?)(\)\3)(")`, ByGroups(LiteralStringAffix, LiteralString, LiteralStringDelimiter, LiteralStringDelimiter, LiteralString, LiteralStringDelimiter, LiteralString), nil},
			{`(u8|u|U)(")`, ByGroups(LiteralStringAffix, LiteralString), Push("string")},
			{`(L?)(")`, ByGroups(LiteralStringAffix, LiteralString), Push("string")},
			{`(L?)(')(\\.|\\[0-7]{1,3}|\\x[a-fA-F0-9]{1,2}|[^\\\'\n])(')`, ByGroups(LiteralStringAffix, LiteralStringChar, LiteralStringChar, LiteralStringChar), nil},
			{`(\d+\.\d*|\.\d+|\d+)[eE][+-]?\d+[LlUu]*`, LiteralNumberFloat, nil},
			{`(\d+\.\d*|\.\d+|\d+[fF])[fF]?`, LiteralNumberFloat, nil},
			{`0[xX]([0-9A-Fa-f]('?[0-9A-Fa-f]+)*)[LlUu]*`, LiteralNumberHex, nil},
			{`0('?[0-7]+)+[LlUu]*`, LiteralNumberOct, nil},
			{`0[Bb][01]('?[01]+)*[LlUu]*`, LiteralNumberBin, nil},
			{`[0-9]('?[0-9]+)*[LlUu]*`, LiteralNumberInteger, nil},
			{`\*/`, Error, nil},
			{`[~!%^&*+=|?:<>/-]`, Operator, nil},
			{`[()\[\],.]`, Punctuation, nil},
			{Words(``, `\b`, `asm`, `auto`, `break`, `case`, `const`, `continue`, `default`, `do`, `else`, `enum`, `extern`, `for`, `goto`, `if`, `register`, `restricted`, `return`, `sizeof`, `static`, `struct`, `switch`, `typedef`, `union`, `volatile`, `while`), Keyword, nil},
			{`(bool|int|long|float|short|double|char((8|16|32)_t)?|wchar_t|unsigned|signed|void|u?int(_fast|_least|)(8|16|32|64)_t)\b`, KeywordType, nil},
			{Words(``, `\b`, `inline`, `_inline`, `__inline`, `naked`, `restrict`, `thread`, `typename`), KeywordReserved, nil},
			{`(__m(128i|128d|128|64))\b`, KeywordReserved, nil},
			{Words(`__`, `\b`, `asm`, `int8`, `based`, `except`, `int16`, `stdcall`, `cdecl`, `fastcall`, `int32`, `declspec`, `finally`, `int64`, `try`, `leave`, `w64`, `unaligned`, `raise`, `noop`, `identifier`, `forceinline`, `assume`), KeywordReserved, nil},
			{`(true|false|NULL)\b`, NameBuiltin, nil},
			{`([a-zA-Z_]\w*)(\s*)(:)(?!:)`, ByGroups(NameLabel, Text, Punctuation), nil},
			{`[a-zA-Z_]\w*`, Name, nil},
		},
		"root": {
			Include("whitespace"),
			{`((?:[\w*\s])+?(?:\s|[*]))([a-zA-Z_]\w*)(\s*\([^;]*?\))([^;{]*)(\{)`, ByGroups(UsingSelf("root"), NameFunction, UsingSelf("root"), UsingSelf("root"), Punctuation), Push("function")},
			{`((?:[\w*\s])+?(?:\s|[*]))([a-zA-Z_]\w*)(\s*\([^;]*?\))([^;]*)(;)`, ByGroups(UsingSelf("root"), NameFunction, UsingSelf("root"), UsingSelf("root"), Punctuation), nil},
			Default(Push("statement")),
			{Words(`__`, `\b`, `virtual_inheritance`, `uuidof`, `super`, `single_inheritance`, `multiple_inheritance`, `interface`, `event`), KeywordReserved, nil},
			{`__(offload|blockingoffload|outer)\b`, KeywordPseudo, nil},
		},
		"classname": {
			{`(\[\[.+\]\])(\s*)`, ByGroups(NameAttribute, Text), nil},
			{`[a-zA-Z_]\w*`, NameClass, Pop(1)},
			{`\s*(?=[>{])`, Text, Pop(1)},
		},
		"whitespace": {
			{`^#if\s+0`, CommentPreproc, Push("if0")},
			{`^#`, CommentPreproc, Push("macro")},
			{`^(\s*(?:/[*].*?[*]/\s*)?)(#if\s+0)`, ByGroups(UsingSelf("root"), CommentPreproc), Push("if0")},
			{`^(\s*(?:/[*].*?[*]/\s*)?)(#)`, ByGroups(UsingSelf("root"), CommentPreproc), Push("macro")},
			{`\n`, Text, nil},
			{`\s+`, Text, nil},
			{`\\\n`, Text, nil},
			{`//(\n|[\w\W]*?[^\\]\n)`, CommentSingle, nil},
			{`/(\\\n)?[*][\w\W]*?[*](\\\n)?/`, CommentMultiline, nil},
			{`/(\\\n)?[*][\w\W]*`, CommentMultiline, nil},
		},
		"statement": {
			Include("whitespace"),
			Include("statements"),
			{`[{]`, Punctuation, Push("root")},
			{`[;}]`, Punctuation, Pop(1)},
		},
		"function": {
			Include("whitespace"),
			Include("statements"),
			{`;`, Punctuation, nil},
			{`\{`, Punctuation, Push()},
			{`\}`, Punctuation, Pop(1)},
		},
		"string": {
			{`"`, LiteralString, Pop(1)},
			{`\\([\\abfnrtv"\']|x[a-fA-F0-9]{2,4}|u[a-fA-F0-9]{4}|U[a-fA-F0-9]{8}|[0-7]{1,3})`, LiteralStringEscape, nil},
			{`[^\\"\n]+`, LiteralString, nil},
			{`\\\n`, LiteralString, nil},
			{`\\`, LiteralString, nil},
		},
		"macro": {
			{`(include)(\s*(?:/[*].*?[*]/\s*)?)([^\n]+)`, ByGroups(CommentPreproc, Text, CommentPreprocFile), nil},
			{`[^/\n]+`, CommentPreproc, nil},
			{`/[*](.|\n)*?[*]/`, CommentMultiline, nil},
			{`//.*?\n`, CommentSingle, Pop(1)},
			{`/`, CommentPreproc, nil},
			{`(?<=\\)\n`, CommentPreproc, nil},
			{`\n`, CommentPreproc, Pop(1)},
		},
		"if0": {
			{`^\s*#if.*?(?<!\\)\n`, CommentPreproc, Push()},
			{`^\s*#el(?:se|if).*\n`, CommentPreproc, Pop(1)},
			{`^\s*#endif.*?(?<!\\)\n`, CommentPreproc, Pop(1)},
			{`.*?\n`, Comment, nil},
		},
	}
}