c.go

Documentation: github.com/alecthomas/chroma/lexers/c

     1  package c
     2  
     3  import (
     4  	. "github.com/alecthomas/chroma" // nolint
     5  	"github.com/alecthomas/chroma/lexers/internal"
     6  )
     7  
     8  // C lexer.
     9  var C = internal.Register(MustNewLazyLexer(
    10  	&Config{
    11  		Name:      "C",
    12  		Aliases:   []string{"c"},
    13  		Filenames: []string{"*.c", "*.h", "*.idc", "*.x[bp]m"},
    14  		MimeTypes: []string{"text/x-chdr", "text/x-csrc", "image/x-xbitmap", "image/x-xpixmap"},
    15  		EnsureNL:  true,
    16  	},
    17  	cRules,
    18  ))
    19  
    20  func cRules() Rules {
    21  	return Rules{
    22  		"whitespace": {
    23  			{`^#if\s+0`, CommentPreproc, Push("if0")},
    24  			{`^#`, CommentPreproc, Push("macro")},
    25  			{`^(\s*(?:/[*].*?[*]/\s*)?)(#if\s+0)`, ByGroups(UsingSelf("root"), CommentPreproc), Push("if0")},
    26  			{`^(\s*(?:/[*].*?[*]/\s*)?)(#)`, ByGroups(UsingSelf("root"), CommentPreproc), Push("macro")},
    27  			{`\n`, Text, nil},
    28  			{`\s+`, Text, nil},
    29  			{`\\\n`, Text, nil},
    30  			{`//(\n|[\w\W]*?[^\\]\n)`, CommentSingle, nil},
    31  			{`/(\\\n)?[*][\w\W]*?[*](\\\n)?/`, CommentMultiline, nil},
    32  			{`/(\\\n)?[*][\w\W]*`, CommentMultiline, nil},
    33  		},
    34  		"statements": {
    35  			{`(L?)(")`, ByGroups(LiteralStringAffix, LiteralString), Push("string")},
    36  			{`(L?)(')(\\.|\\[0-7]{1,3}|\\x[a-fA-F0-9]{1,2}|[^\\\'\n])(')`, ByGroups(LiteralStringAffix, LiteralStringChar, LiteralStringChar, LiteralStringChar), nil},
    37  			{`(\d+\.\d*|\.\d+|\d+)[eE][+-]?\d+[LlUu]*`, LiteralNumberFloat, nil},
    38  			{`(\d+\.\d*|\.\d+|\d+[fF])[fF]?`, LiteralNumberFloat, nil},
    39  			{`0x[0-9a-fA-F]+[LlUu]*`, LiteralNumberHex, nil},
    40  			{`0[0-7]+[LlUu]*`, LiteralNumberOct, nil},
    41  			{`\d+[LlUu]*`, LiteralNumberInteger, nil},
    42  			{`\*/`, Error, nil},
    43  			{`[~!%^&*+=|?:<>/-]`, Operator, nil},
    44  			{`[()\[\],.]`, Punctuation, nil},
    45  			{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},
    46  			{`(bool|int|long|float|short|double|char((8|16|32)_t)?|unsigned|signed|void|u?int(_fast|_least|)(8|16|32|64)_t)\b`, KeywordType, nil},
    47  			{Words(``, `\b`, `inline`, `_inline`, `__inline`, `naked`, `restrict`, `thread`, `typename`), KeywordReserved, nil},
    48  			{`(__m(128i|128d|128|64))\b`, KeywordReserved, nil},
    49  			{Words(`__`, `\b`, `asm`, `int8`, `based`, `except`, `int16`, `stdcall`, `cdecl`, `fastcall`, `int32`, `declspec`, `finally`, `int64`, `try`, `leave`, `wchar_t`, `w64`, `unaligned`, `raise`, `noop`, `identifier`, `forceinline`, `assume`), KeywordReserved, nil},
    50  			{`(true|false|NULL)\b`, NameBuiltin, nil},
    51  			{`([a-zA-Z_]\w*)(\s*)(:)(?!:)`, ByGroups(NameLabel, Text, Punctuation), nil},
    52  			{`[a-zA-Z_]\w*`, Name, nil},
    53  		},
    54  		"root": {
    55  			Include("whitespace"),
    56  			{`((?:[\w*\s])+?(?:\s|[*]))([a-zA-Z_]\w*)(\s*\([^;]*?\))([^;{]*)(\{)`, ByGroups(UsingSelf("root"), NameFunction, UsingSelf("root"), UsingSelf("root"), Punctuation), Push("function")},
    57  			{`((?:[\w*\s])+?(?:\s|[*]))([a-zA-Z_]\w*)(\s*\([^;]*?\))([^;]*)(;)`, ByGroups(UsingSelf("root"), NameFunction, UsingSelf("root"), UsingSelf("root"), Punctuation), nil},
    58  			Default(Push("statement")),
    59  		},
    60  		"statement": {
    61  			Include("whitespace"),
    62  			Include("statements"),
    63  			{`[{}]`, Punctuation, nil},
    64  			{`;`, Punctuation, Pop(1)},
    65  		},
    66  		"function": {
    67  			Include("whitespace"),
    68  			Include("statements"),
    69  			{`;`, Punctuation, nil},
    70  			{`\{`, Punctuation, Push()},
    71  			{`\}`, Punctuation, Pop(1)},
    72  		},
    73  		"string": {
    74  			{`"`, LiteralString, Pop(1)},
    75  			{`\\([\\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},
    76  			{`[^\\"\n]+`, LiteralString, nil},
    77  			{`\\\n`, LiteralString, nil},
    78  			{`\\`, LiteralString, nil},
    79  		},
    80  		"macro": {
    81  			{`(include)(\s*(?:/[*].*?[*]/\s*)?)([^\n]+)`, ByGroups(CommentPreproc, Text, CommentPreprocFile), nil},
    82  			{`[^/\n]+`, CommentPreproc, nil},
    83  			{`/[*](.|\n)*?[*]/`, CommentMultiline, nil},
    84  			{`//.*?\n`, CommentSingle, Pop(1)},
    85  			{`/`, CommentPreproc, nil},
    86  			{`(?<=\\)\n`, CommentPreproc, nil},
    87  			{`\n`, CommentPreproc, Pop(1)},
    88  		},
    89  		"if0": {
    90  			{`^\s*#if.*?(?<!\\)\n`, CommentPreproc, Push()},
    91  			{`^\s*#el(?:se|if).*\n`, CommentPreproc, Pop(1)},
    92  			{`^\s*#endif.*?(?<!\\)\n`, CommentPreproc, Pop(1)},
    93  			{`.*?\n`, Comment, nil},
    94  		},
    95  	}
    96  }
    97
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