path: root/runtime/syntax/c.vim

" Vim syntax file
" Language:	C
" Maintainer:	Bram Moolenaar <Bram@vim.org>
" Last Change:	2014 May 26

" Quit when a (custom) syntax file was already loaded
if exists("b:current_syntax")
  finish
endif

let s:cpo_save = &cpo
set cpo&vim

let s:ft = matchstr(&ft, '^\([^.]\)\+')

" A bunch of useful C keywords
syn keyword	cStatement	goto break return continue asm
syn keyword	cLabel		case default
syn keyword	cConditional	if else switch
syn keyword	cRepeat		while for do

syn keyword	cTodo		contained TODO FIXME XXX

" It's easy to accidentally add a space after a backslash that was intended
" for line continuation.  Some compilers allow it, which makes it
" unpredictable and should be avoided.
syn match	cBadContinuation contained "\\\s\+$"

" cCommentGroup allows adding matches for special things in comments
syn cluster	cCommentGroup	contains=cTodo,cBadContinuation

" String and Character constants
" Highlight special characters (those which have a backslash) differently
syn match	cSpecial	display contained "\\\(x\x\+\|\o\{1,3}\|.\|$\)"
if !exists("c_no_utf")
  syn match	cSpecial	display contained "\\\(u\x\{4}\|U\x\{8}\)"
endif
if exists("c_no_cformat")
  syn region	cString		start=+L\="+ skip=+\\\\\|\\"+ end=+"+ contains=cSpecial,@Spell extend
  " cCppString: same as cString, but ends at end of line
  if !exists("cpp_no_cpp11") " ISO C++11
    syn region cCppString	start=+\(L\|u\|u8\|U\|R\|LR\|u8R\|uR\|UR\)\="+ skip=+\\\\\|\\"\|\\$+ excludenl end=+"+ end='$' contains=cSpecial,cFormat,@Spell
  else
    syn region cCppString	start=+L\="+ skip=+\\\\\|\\"\|\\$+ excludenl end=+"+ end='$' contains=cSpecial,cFormat,@Spell
  endif
  syn region	cCppOut2	contained start="0" end="^\s*\(%:\|#\)\s*\(endif\>\|else\>\|elif\>\)" contains=cSpaceError,cCppSkip
  syn region	cCppSkip	contained start="^\s*\(%:\|#\)\s*\(if\>\|ifdef\>\|ifndef\>\)" skip="\\$" end="^\s*\(%:\|#\)\s*endif\>" contains=cSpaceError,cCppSkip
else
  if !exists("c_no_c99") " ISO C99
    syn match	cFormat		display "%\(\d\+\$\)\=[-+' #0*]*\(\d*\|\*\|\*\d\+\$\)\(\.\(\d*\|\*\|\*\d\+\$\)\)\=\([hlLjzt]\|ll\|hh\)\=\([aAbdiuoxXDOUfFeEgGcCsSpn]\|\[\^\=.[^]]*\]\)" contained
  else
    syn match	cFormat		display "%\(\d\+\$\)\=[-+' #0*]*\(\d*\|\*\|\*\d\+\$\)\(\.\(\d*\|\*\|\*\d\+\$\)\)\=\([hlL]\|ll\)\=\([bdiuoxXDOUfeEgGcCsSpn]\|\[\^\=.[^]]*\]\)" contained
  endif
  syn match	cFormat		display "%%" contained
  syn region	cString		start=+L\="+ skip=+\\\\\|\\"+ end=+"+ contains=cSpecial,cFormat,@Spell extend
  " cCppString: same as cString, but ends at end of line
  syn region	cCppString	start=+L\="+ skip=+\\\\\|\\"\|\\$+ excludenl end=+"+ end='$' contains=cSpecial,cFormat,@Spell
endif

syn match	cCharacter	"L\='[^\\]'"
syn match	cCharacter	"L'[^']*'" contains=cSpecial
if exists("c_gnu")
  syn match	cSpecialError	"L\='\\[^'\"?\\abefnrtv]'"
  syn match	cSpecialCharacter "L\='\\['\"?\\abefnrtv]'"
else
  syn match	cSpecialError	"L\='\\[^'\"?\\abfnrtv]'"
  syn match	cSpecialCharacter "L\='\\['\"?\\abfnrtv]'"
endif
syn match	cSpecialCharacter display "L\='\\\o\{1,3}'"
syn match	cSpecialCharacter display "'\\x\x\{1,2}'"
syn match	cSpecialCharacter display "L'\\x\x\+'"

if !exists("c_no_c11") " ISO C11
  if exists("c_no_cformat")
    syn region	cString		start=+\%(U\|u8\=\)"+ skip=+\\\\\|\\"+ end=+"+ contains=cSpecial,@Spell extend
  else
    syn region	cString		start=+\%(U\|u8\=\)"+ skip=+\\\\\|\\"+ end=+"+ contains=cSpecial,cFormat,@Spell extend
  endif
  syn match	cCharacter	"[Uu]'[^\\]'"
  syn match	cCharacter	"[Uu]'[^']*'" contains=cSpecial
  if exists("c_gnu")
    syn match	cSpecialError	"[Uu]'\\[^'\"?\\abefnrtv]'"
    syn match	cSpecialCharacter "[Uu]'\\['\"?\\abefnrtv]'"
  else
    syn match	cSpecialError	"[Uu]'\\[^'\"?\\abfnrtv]'"
    syn match	cSpecialCharacter "[Uu]'\\['\"?\\abfnrtv]'"
  endif
  syn match	cSpecialCharacter display "[Uu]'\\\o\{1,3}'"
  syn match	cSpecialCharacter display "[Uu]'\\x\x\+'"
endif

"when wanted, highlight trailing white space
if exists("c_space_errors")
  if !exists("c_no_trail_space_error")
    syn match	cSpaceError	display excludenl "\s\+$"
  endif
  if !exists("c_no_tab_space_error")
    syn match	cSpaceError	display " \+\t"me=e-1
  endif
endif

" This should be before cErrInParen to avoid problems with #define ({ xxx })
if exists("c_curly_error")
  syn match cCurlyError "}"
  syn region	cBlock		start="{" end="}" contains=ALLBUT,cBadBlock,cCurlyError,@cParenGroup,cErrInParen,cCppParen,cErrInBracket,cCppBracket,cCppString,@Spell fold
else
  syn region	cBlock		start="{" end="}" transparent fold
endif

"catch errors caused by wrong parenthesis and brackets
" also accept <% for {, %> for }, <: for [ and :> for ] (C99)
" But avoid matching <::.
syn cluster	cParenGroup	contains=cParenError,cIncluded,cSpecial,cCommentSkip,cCommentString,cComment2String,@cCommentGroup,cCommentStartError,cUserLabel,cBitField,cOctalZero,@cCppOutInGroup,cFormat,cNumber,cFloat,cOctal,cOctalError,cNumbersCom
if exists("c_no_curly_error")
  if s:ft ==# 'cpp' && !exists("cpp_no_cpp11")
    syn region	cParen		transparent start='(' end=')' contains=ALLBUT,@cParenGroup,cCppParen,cCppString,@Spell
    " cCppParen: same as cParen but ends at end-of-line; used in cDefine
    syn region	cCppParen	transparent start='(' skip='\\$' excludenl end=')' end='$' contained contains=ALLBUT,@cParenGroup,cParen,cString,@Spell
    syn match	cParenError	display ")"
    syn match	cErrInParen	display contained "^^<%\|^%>"
  else
    syn region	cParen		transparent start='(' end=')' end='}'me=s-1 contains=ALLBUT,cBlock,@cParenGroup,cCppParen,cCppString,@Spell
    " cCppParen: same as cParen but ends at end-of-line; used in cDefine
    syn region	cCppParen	transparent start='(' skip='\\$' excludenl end=')' end='$' contained contains=ALLBUT,@cParenGroup,cParen,cString,@Spell
    syn match	cParenError	display ")"
    syn match	cErrInParen	display contained "^[{}]\|^<%\|^%>"
  endif
elseif exists("c_no_bracket_error")
  if s:ft ==# 'cpp' && !exists("cpp_no_cpp11")
    syn region	cParen		transparent start='(' end=')' contains=ALLBUT,@cParenGroup,cCppParen,cCppString,@Spell
    " cCppParen: same as cParen but ends at end-of-line; used in cDefine
    syn region	cCppParen	transparent start='(' skip='\\$' excludenl end=')' end='$' contained contains=ALLBUT,@cParenGroup,cParen,cString,@Spell
    syn match	cParenError	display ")"
    syn match	cErrInParen	display contained "<%\|%>"
  else
    syn region	cParen		transparent start='(' end=')' end='}'me=s-1 contains=ALLBUT,cBlock,@cParenGroup,cCppParen,cCppString,@Spell
    " cCppParen: same as cParen but ends at end-of-line; used in cDefine
    syn region	cCppParen	transparent start='(' skip='\\$' excludenl end=')' end='$' contained contains=ALLBUT,@cParenGroup,cParen,cString,@Spell
    syn match	cParenError	display ")"
    syn match	cErrInParen	display contained "[{}]\|<%\|%>"
  endif
else
  if s:ft ==# 'cpp' && !exists("cpp_no_cpp11")
    syn region	cParen		transparent start='(' end=')' contains=ALLBUT,@cParenGroup,cCppParen,cErrInBracket,cCppBracket,cCppString,@Spell
    " cCppParen: same as cParen but ends at end-of-line; used in cDefine
    syn region	cCppParen	transparent start='(' skip='\\$' excludenl end=')' end='$' contained contains=ALLBUT,@cParenGroup,cErrInBracket,cParen,cBracket,cString,@Spell
    syn match	cParenError	display "[\])]"
    syn match	cErrInParen	display contained "<%\|%>"
    syn region	cBracket	transparent start='\[\|<::\@!' end=']\|:>' contains=ALLBUT,@cParenGroup,cErrInParen,cCppParen,cCppBracket,cCppString,@Spell
  else
    syn region	cParen		transparent start='(' end=')' end='}'me=s-1 contains=ALLBUT,cBlock,@cParenGroup,cCppParen,cErrInBracket,cCppBracket,cCppString,@Spell
    " cCppParen: same as cParen but ends at end-of-line; used in cDefine
    syn region	cCppParen	transparent start='(' skip='\\$' excludenl end=')' end='$' contained contains=ALLBUT,@cParenGroup,cErrInBracket,cParen,cBracket,cString,@Spell
    syn match	cParenError	display "[\])]"
    syn match	cErrInParen	display contained "[\]{}]\|<%\|%>"
    syn region	cBracket	transparent start='\[\|<::\@!' end=']\|:>' end='}'me=s-1 contains=ALLBUT,cBlock,@cParenGroup,cErrInParen,cCppParen,cCppBracket,cCppString,@Spell
  endif
  " cCppBracket: same as cParen but ends at end-of-line; used in cDefine
  syn region	cCppBracket	transparent start='\[\|<::\@!' skip='\\$' excludenl end=']\|:>' end='$' contained contains=ALLBUT,@cParenGroup,cErrInParen,cParen,cBracket,cString,@Spell
  syn match	cErrInBracket	display contained "[);{}]\|<%\|%>"
endif

if s:ft ==# 'c' || exists("cpp_no_cpp11")
  syn region	cBadBlock	keepend start="{" end="}" contained containedin=cParen,cBracket,cBadBlock transparent fold
endif

"integer number, or floating point number without a dot and with "f".
syn case ignore
syn match	cNumbers	display transparent "\<\d\|\.\d" contains=cNumber,cFloat,cOctalError,cOctal
" Same, but without octal error (for comments)
syn match	cNumbersCom	display contained transparent "\<\d\|\.\d" contains=cNumber,cFloat,cOctal
syn match	cNumber		display contained "\d\+\(u\=l\{0,2}\|ll\=u\)\>"
"hex number
syn match	cNumber		display contained "0x\x\+\(u\=l\{0,2}\|ll\=u\)\>"
" Flag the first zero of an octal number as something special
syn match	cOctal		display contained "0\o\+\(u\=l\{0,2}\|ll\=u\)\>" contains=cOctalZero
syn match	cOctalZero	display contained "\<0"
syn match	cFloat		display contained "\d\+f"
"floating point number, with dot, optional exponent
syn match	cFloat		display contained "\d\+\.\d*\(e[-+]\=\d\+\)\=[fl]\="
"floating point number, starting with a dot, optional exponent
syn match	cFloat		display contained "\.\d\+\(e[-+]\=\d\+\)\=[fl]\=\>"
"floating point number, without dot, with exponent
syn match	cFloat		display contained "\d\+e[-+]\=\d\+[fl]\=\>"
if !exists("c_no_c99")
  "hexadecimal floating point number, optional leading digits, with dot, with exponent
  syn match	cFloat		display contained "0x\x*\.\x\+p[-+]\=\d\+[fl]\=\>"
  "hexadecimal floating point number, with leading digits, optional dot, with exponent
  syn match	cFloat		display contained "0x\x\+\.\=p[-+]\=\d\+[fl]\=\>"
endif

" flag an octal number with wrong digits
syn match	cOctalError	display contained "0\o*[89]\d*"
syn case match

if exists("c_comment_strings")
  " A comment can contain cString, cCharacter and cNumber.
  " But a "*/" inside a cString in a cComment DOES end the comment!  So we
  " need to use a special type of cString: cCommentString, which also ends on
  " "*/", and sees a "*" at the start of the line as comment again.
  " Unfortunately this doesn't very well work for // type of comments :-(
  syn match	cCommentSkip	contained "^\s*\*\($\|\s\+\)"
  syn region cCommentString	contained start=+L\=\\\@<!"+ skip=+\\\\\|\\"+ end=+"+ end=+\*/+me=s-1 contains=cSpecial,cCommentSkip
  syn region cComment2String	contained start=+L\=\\\@<!"+ skip=+\\\\\|\\"+ end=+"+ end="$" contains=cSpecial
  syn region  cCommentL	start="//" skip="\\$" end="$" keepend contains=@cCommentGroup,cComment2String,cCharacter,cNumbersCom,cSpaceError,@Spell
  if exists("c_no_comment_fold")
    " Use "extend" here to have preprocessor lines not terminate halfway a
    " comment.
    syn region cComment	matchgroup=cCommentStart start="/\*" end="\*/" contains=@cCommentGroup,cCommentStartError,cCommentString,cCharacter,cNumbersCom,cSpaceError,@Spell extend
  else
    syn region cComment	matchgroup=cCommentStart start="/\*" end="\*/" contains=@cCommentGroup,cCommentStartError,cCommentString,cCharacter,cNumbersCom,cSpaceError,@Spell fold extend
  endif
else
  syn region	cCommentL	start="//" skip="\\$" end="$" keepend contains=@cCommentGroup,cSpaceError,@Spell
  if exists("c_no_comment_fold")
    syn region	cComment	matchgroup=cCommentStart start="/\*" end="\*/" contains=@cCommentGroup,cCommentStartError,cSpaceError,@Spell extend
  else
    syn region	cComment	matchgroup=cCommentStart start="/\*" end="\*/" contains=@cCommentGroup,cCommentStartError,cSpaceError,@Spell fold extend
  endif
endif
" keep a // comment separately, it terminates a preproc. conditional
syn match	cCommentError	display "\*/"
syn match	cCommentStartError display "/\*"me=e-1 contained

syn keyword	cOperator	sizeof
if exists("c_gnu")
  syn keyword	cStatement	__asm__
  syn keyword	cOperator	typeof __real__ __imag__
endif
syn keyword	cType		int long short char void
syn keyword	cType		signed unsigned float double
if !exists("c_no_ansi") || exists("c_ansi_typedefs")
  syn keyword   cType		size_t ssize_t off_t wchar_t ptrdiff_t sig_atomic_t fpos_t
  syn keyword   cType		clock_t time_t va_list jmp_buf FILE DIR div_t ldiv_t
  syn keyword   cType		mbstate_t wctrans_t wint_t wctype_t
endif
if !exists("c_no_c99") " ISO C99
  syn keyword	cType		_Bool bool _Complex complex _Imaginary imaginary
  syn keyword	cType		int8_t int16_t int32_t int64_t
  syn keyword	cType		uint8_t uint16_t uint32_t uint64_t
  syn keyword	cType		int_least8_t int_least16_t int_least32_t int_least64_t
  syn keyword	cType		uint_least8_t uint_least16_t uint_least32_t uint_least64_t
  syn keyword	cType		int_fast8_t int_fast16_t int_fast32_t int_fast64_t
  syn keyword	cType		uint_fast8_t uint_fast16_t uint_fast32_t uint_fast64_t
  syn keyword	cType		intptr_t uintptr_t
  syn keyword	cType		intmax_t uintmax_t
endif
if exists("c_gnu")
  syn keyword	cType		__label__ __complex__ __volatile__
endif

syn keyword	cStructure	struct union enum typedef
syn keyword	cStorageClass	static register auto volatile extern const
if exists("c_gnu")
  syn keyword	cStorageClass	inline __attribute__
endif
if !exists("c_no_c99")
  syn keyword	cStorageClass	inline restrict
endif
if !exists("c_no_c11")
  syn keyword	cStorageClass	_Alignas alignas
  syn keyword	cOperator	_Alignof alignof
  syn keyword	cStorageClass	_Atomic
  syn keyword	cOperator	_Generic
  syn keyword	cStorageClass	_Noreturn noreturn
  syn keyword	cOperat