" Vim syntax file
" Language:    C
" Maintainer:    Bram Moolenaar <Bram@vim.org>
" Last Change:    2016 Nov 18

" 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")
  " Highlight % items in strings.
  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
endif

" cCppString: same as cString, but ends at end of line
if s:ft ==# "cpp" && !exists("cpp_no_cpp11") && !exists("c_no_cformat")
  " ISO C++11
  syn region    cString        start=+\(L\|u\|u8\|U\|R\|LR\|u8R\|uR\|UR\)\="+ skip=+\\\\\|\\"+ end=+"+ contains=cSpecial,cFormat,@Spell extend
  syn region     cCppString    start=+\(L\|u\|u8\|U\|R\|LR\|u8R\|uR\|UR\)\="+ skip=+\\\\\|\\"\|\\$+ excludenl end=+"+ end='$' contains=cSpecial,cFormat,@Spell
elseif s:ft ==# "c" && !exists("c_no_c11") && !exists("c_no_cformat")
  " ISO C99
  syn region    cString        start=+\%(L\|U\|u8\)\="+ skip=+\\\\\|\\"+ end=+"+ contains=cSpecial,cFormat,@Spell extend
  syn region    cCppString    start=+\%(L\|U\|u8\)\="+ skip=+\\\\\|\\"\|\\$+ excludenl end=+"+ end='$' contains=cSpecial,cFormat,@Spell
else
  " older C or C++
  syn match    cFormat        display "%%" contained
  syn region    cString        start=+L\="+ skip=+\\\\\|\\"+ end=+"+ contains=cSpecial,cFormat,@Spell extend
  syn region    cCppString    start=+L\="+ skip=+\\\\\|\\"\|\\$+ excludenl end=+"+ end='$' contains=cSpecial,cFormat,@Spell
endif

syn region    cCppSkip    contained start="^\s*\(%:\|#\)\s*\(if\>\|ifdef\>\|ifndef\>\)" skip="\\$" end="^\s*\(%:\|#\)\s*endif\>" contains=cSpaceError,cCppSkip

syn cluster    cStringGroup    contains=cCppString,cCppSkip

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 (s:ft ==# "c" && !exists("c_no_c11")) || (s:ft ==# "cpp" && !exists("cpp_no_cpp11"))
  " ISO C11 or ISO C++ 11
  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,@cStringGroup,@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,@cStringGroup,@Spell
    " cCppParen: same as cParen but ends at end-of-line; used in cDefine
    syn region    cCppParen    transparent start='(' skip='\\$' excludenl end=')' end='$' contained contains=ALLBUT,@cParenGroup,cParen,cString,@Spell
    syn match    cParenError    display ")"
    syn match    cErrInParen    display contained "^^<%\|^%>"
  else
    syn region    cParen        transparent start='(' end=')' end='}'me=s-1 contains=ALLBUT,cBlock,@cParenGroup,cCppParen,@cStringGroup,@Spell
    " cCppParen: same as cParen but ends at end-of-line; used in cDefine
    syn region    cCppParen    transparent start='(' skip='\\$' excludenl end=')' end='$' contained contains=ALLBUT,@cParenGroup,cParen,cString,@Spell
    syn match    cParenError    display ")"
    syn match    cErrInParen    display contained "^[{}]\|^<%\|^%>"
  endif
elseif exists("c_no_bracket_error")
  if s:ft ==# 'cpp' && !exists("cpp_no_cpp11")
    syn region    cParen        transparent start='(' end=')' contains=ALLBUT,@cParenGroup,cCppParen,@cStringGroup,@Spell
    " cCppParen: same as cParen but ends at end-of-line; used in cDefine
    syn region    cCppParen    transparent start='(' skip='\\$' excludenl end=')' end='$' contained contains=ALLBUT,@cParenGroup,cParen,cString,@Spell
    syn match    cParenError    display ")"
    syn match    cErrInParen    display contained "<%\|%>"
  else
    syn region    cParen        transparent start='(' end=')' end='}'me=s-1 contains=ALLBUT,cBlock,@cParenGroup,cCppParen,@cStringGroup,@Spell
    " cCppParen: same as cParen but ends at end-of-line; used in cDefine
    syn region    cCppParen    transparent start='(' skip='\\$' excludenl end=')' end='$' contained contains=ALLBUT,@cParenGroup,cParen,cString,@Spell
    syn match    cParenError    display ")"
    syn match    cErrInParen    display contained "[{}]\|<%\|%>"
  endif
else
  if s:ft ==# 'cpp' && !exists("cpp_no_cpp11")
    syn region    cParen        transparent start='(' end=')' contains=ALLBUT,@cParenGroup,cCppParen,cErrInBracket,cCppBracket,@cStringGroup,@Spell
    " cCppParen: same as cParen but ends at end-of-line; used in cDefine
    syn region    cCppParen    transparent start='(' skip='\\$' 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='\[\|<::\@!' end=']\|:>' contains=ALLBUT,@cParenGroup,cErrInParen,cCppParen,cCppBracket,@cStringGroup,@Spell
  else
    syn region    cParen        transparent start='(' end=')' end='}'me=s-1 contains=ALLBUT,cBlock,@cParenGroup,cCppParen,cErrInBracket,cCppBracket,@cStringGroup,@Spell
    " cCppParen: same as cParen but ends at end-of-line; used in cDefine
    syn region    cCppParen    transparent start='(' skip='\\$' excludenl end=')' end='$' contained contains=ALLBUT,@cParenGroup,cErrInBracket,cParen,cBracket,cString,@Spell
    syn match    cParenError    display "[\])]"
    syn match    cErrInParen    display contained "[\]{}]\|<%\|%>"
    syn region    cBracket    transparent start='\[\|<::\@!' end=']\|:>' end='}'me=s-1 contains=ALLBUT,cBlock,@cParenGroup,cErrInParen,cCppParen,cCppBracket,@cStringGroup,@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
  if !exists("c_no_bsd")
    " These are BSD specific.
    syn keyword    cType        u_int8_t u_int16_t u_int32_t u_int64_t
  endif
  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") && s:ft !=# 'cpp'
  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    cOperator    _Static_assert static_assert
  syn keyword    cStorageClass    _Thread_local thread_local
  syn keyword   cType        char16_t char32_t
endif

if !exists("c_no_ansi") || exists("c_ansi_constants") || exists("c_gnu")
  if exists("c_gnu")
    syn keyword cConstant __GNUC__ __FUNCTION__ __PRETTY_FUNCTION__ __func__
  endif
  syn keyword cConstant __LINE__ __FILE__ __DATE__ __TIME__ __STDC__
  syn keyword cConstant __STDC_VERSION__
  syn keyword cConstant CHAR_BIT MB_LEN_MAX MB_CUR_MAX
  syn keyword cConstant UCHAR_MAX UINT_MAX ULONG_MAX USHRT_MAX
  syn keyword cConstant CHAR_MIN INT_MIN LONG_MIN SHRT_MIN
  syn keyword cConstant CHAR_MAX INT_MAX LONG_MAX SHRT_MAX
  syn keyword cConstant SCHAR_MIN SINT_MIN SLONG_MIN SSHRT_MIN
  syn keyword cConstant SCHAR_MAX SINT_MAX SLONG_MAX SSHRT_MAX
  if !exists("c_no_c99")
    syn keyword cConstant __func__ __VA_ARGS__
    syn keyword cConstant LLONG_MIN LLONG_MAX ULLONG_MAX
    syn keyword cConstant INT8_MIN INT16_MIN INT32_MIN INT64_MIN
    syn keyword cConstant INT8_MAX INT16_MAX INT32_MAX INT64_MAX
    syn keyword cConstant UINT8_MAX UINT16_MAX UINT32_MAX UINT64_MAX
    syn keyword cConstant INT_LEAST8_MIN INT_LEAST16_MIN INT_LEAST32_MIN INT_LEAST64_MIN
    syn keyword cConstant INT_LEAST8_MAX INT_LEAST16_MAX INT_LEAST32_MAX INT_LEAST64_MAX
    syn keyword cConstant UINT_LEAST8_MAX UINT_LEAST16_MAX UINT_LEAST32_MAX UINT_LEAST64_MAX
    syn keyword cConstant INT_FAST8_MIN INT_FAST16_MIN INT_FAST32_MIN INT_FAST64_MIN
    syn keyword cConstant INT_FAST8_MAX INT_FAST16_MAX INT_FAST32_MAX INT_FAST64_MAX
    syn keyword cConstant UINT_FAST8_MAX UINT_FAST16_MAX UINT_FAST32_MAX UINT_FAST64_MAX
    syn keyword cConstant INTPTR_MIN INTPTR_MAX UINTPTR_MAX
    syn keyword cConstant INTMAX_MIN INTMAX_MAX UINTMAX_MAX
    syn keyword cConstant PTRDIFF_MIN PTRDIFF_MAX SIG_ATOMIC_MIN SIG_ATOMIC_MAX
    syn keyword cConstant SIZE_MAX WCHAR_MIN WCHAR_MAX WINT_MIN WINT_MAX
  endif
  syn keyword cConstant FLT_RADIX FLT_ROUNDS
  syn keyword cConstant FLT_DIG FLT_MANT_DIG FLT_EPSILON
  syn keyword cConstant DBL_DIG DBL_MANT_DIG DBL_EPSILON
  syn keyword cConstant LDBL_DIG LDBL_MANT_DIG LDBL_EPSILON
  syn keyword cConstant FLT_MIN FLT_MAX FLT_MIN_EXP FLT_MAX_EXP
  syn keyword cConstant FLT_MIN_10_EXP FLT_MAX_10_EXP
  syn keyword cConstant DBL_MIN DBL_MAX DBL_MIN_EXP DBL_MAX_EXP
  syn keyword cConstant DBL_MIN_10_EXP DBL_MAX_10_EXP
  syn keyword cConstant LDBL_MIN LDBL_MAX LDBL_MIN_EXP LDBL_MAX_EXP
  syn keyword cConstant LDBL_MIN_10_EXP LDBL_MAX_10_EXP
  syn keyword cConstant HUGE_VAL CLOCKS_PER_SEC NULL
  syn keyword cConstant LC_ALL LC_COLLATE LC_CTYPE LC_MONETARY
  syn keyword cConstant LC_NUMERIC LC_TIME
  syn keyword cConstant SIG_DFL SIG_ERR SIG_IGN
  syn keyword cConstant SIGABRT SIGFPE SIGILL SIGHUP SIGINT SIGSEGV SIGTERM
  " Add POSIX signals as well...
  syn keyword cConstant SIGABRT SIGALRM SIGCHLD SIGCONT SIGFPE SIGHUP
  syn keyword cConstant SIGILL SIGINT SIGKILL SIGPIPE SIGQUIT SIGSEGV
  syn keyword cConstant SIGSTOP SIGTERM SIGTRAP SIGTSTP SIGTTIN SIGTTOU
  syn keyword cConstant SIGUSR1 SIGUSR2
  syn keyword cConstant _IOFBF _IOLBF _IONBF BUFSIZ EOF WEOF
  syn keyword cConstant FOPEN_MAX FILENAME_MAX L_tmpnam
  syn keyword cConstant SEEK_CUR SEEK_END SEEK_SET
  syn keyword cConstant TMP_MAX stderr stdin stdout
  syn keyword cConstant EXIT_FAILURE EXIT_SUCCESS RAND_MAX
  " POSIX 2001
  syn keyword cConstant SIGBUS SIGPOLL SIGPROF SIGSYS SIGURG
  syn keyword cConstant SIGVTALRM SIGXCPU SIGXFSZ
  " non-POSIX signals
  syn keyword cConstant SIGWINCH SIGINFO
  " Add POSIX errors as well
  syn keyword cConstant E2BIG EACCES EAGAIN EBADF EBADMSG EBUSY
  syn keyword cConstant ECANCELED ECHILD EDEADLK EDOM EEXIST EFAULT
  syn keyword cConstant EFBIG EILSEQ EINPROGRESS EINTR EINVAL EIO EISDIR
  syn keyword cConstant EMFILE EMLINK EMSGSIZE ENAMETOOLONG ENFILE ENODEV
  syn keyword cConstant ENOENT ENOEXEC ENOLCK ENOMEM ENOSPC ENOSYS
  syn keyword cConstant ENOTDIR ENOTEMPTY ENOTSUP ENOTTY ENXIO EPERM
  syn keyword cConstant EPIPE ERANGE EROFS ESPIPE ESRCH ETIMEDOUT EXDEV
  " math.h
  syn keyword cConstant M_E M_LOG2E M_LOG10E M_LN2 M_LN10 M_PI M_PI_2 M_PI_4
  syn keyword cConstant M_1_PI M_2_PI M_2_SQRTPI M_SQRT2 M_SQRT1_2
endif
if !exists("c_no_c99") " ISO C99
  syn keyword cConstant true false
endif

" Accept %: for # (C99)
syn region    cPreCondit    start="^\s*\zs\(%:\|#\)\s*\(if\|ifdef\|ifndef\|elif\)\>" skip="\\$" end="$" keepend contains=cComment,cCommentL,cCppString,cCharacter,cCppParen,cParenError,cNumbers,cCommentError,cSpaceError
syn match    cPreConditMatch    display "^\s*\zs\(%:\|#\)\s*\(else\|endif\)\>"
if !exists("c_no_if0")
  syn cluster    cCppOutInGroup    contains=cCppInIf,cCppInElse,cCppInElse2,cCppOutIf,cCppOutIf2,cCppOutElse,cCppInSkip,cCppOutSkip
  syn region    cCppOutWrapper    start="^\s*\zs\(%:\|#\)\s*if\s\+0\+\s*\($\|//\|/\*\|&\)" end=".\@=\|$" contains=cCppOutIf,cCppOutElse,@NoSpell fold
  syn region    cCppOutIf    contained start="0\+" matchgroup=cCppOutWrapper end="^\s*\(%:\|#\)\s*endif\>" contains=cCppOutIf2,cCppOutElse
  if !exists("c_no_if0_fold")
    syn region    cCppOutIf2    contained matchgroup=cCppOutWrapper start="0\+" end="^\s*\(%:\|#\)\s*\(else\>\|elif\s\+\(0\+\s*\($\|//\|/\*\|&\)\)\@!\|endif\>\)"me=s-1 contains=cSpaceError,cCppOutSkip,@Spell fold
  else
    syn region    cCppOutIf2    contained matchgroup=cCppOutWrapper start="0\+" end="^\s*\(%:\|#\)\s*\(else\>\|elif\s\+\(0\+\s*\($\|//\|/\*\|&\)\)\@!\|endif\>\)"me=s-1 contains=cSpaceError,cCppOutSkip,@Spell
  endif
  syn region    cCppOutElse    contained matchgroup=cCppOutWrapper start="^\s*\(%:\|#\)\s*\(else\|elif\)" end="^\s*\(%:\|#\)\s*endif\>"me=s-1 contains=TOP,cPreCondit
  syn region    cCppInWrapper    start="^\s*\zs\(%:\|#\)\s*if\s\+0*[1-9]\d*\s*\($\|//\|/\*\||\)" end=".\@=\|$" contains=cCppInIf,cCppInElse fold
  syn region    cCppInIf    contained matchgroup=cCppInWrapper start="\d\+" end="^\s*\(%:\|#\)\s*endif\>" contains=TOP,cPreCondit
  if !exists("c_no_if0_fold")
    syn region    cCppInElse    contained start="^\s*\(%:\|#\)\s*\(else\>\|elif\s\+\(0*[1-9]\d*\s*\($\|//\|/\*\||\)\)\@!\)" end=".\@=\|$" containedin=cCppInIf contains=cCppInElse2 fold
  else
    syn region    cCppInElse    contained start="^\s*\(%:\|#\)\s*\(else\>\|elif\s\+\(0*[1-9]\d*\s*\($\|//\|/\*\||\)\)\@!\)" end=".\@=\|$" containedin=cCppInIf contains=cCppInElse2
  endif
  syn region    cCppInElse2    contained matchgroup=cCppInWrapper start="^\s*\(%:\|#\)\s*\(else\|elif\)\([^/]\|/[^/*]\)*" end="^\s*\(%:\|#\)\s*endif\>"me=s-1 contains=cSpaceError,cCppOutSkip,@Spell
  syn region    cCppOutSkip    contained start="^\s*\(%:\|#\)\s*\(if\>\|ifdef\>\|ifndef\>\)" skip="\\$" end="^\s*\(%:\|#\)\s*endif\>" contains=cSpaceError,cCppOutSkip
  syn region    cCppInSkip    contained matchgroup=cCppInWrapper start="^\s*\(%:\|#\)\s*\(if\s\+\(\d\+\s*\($\|//\|/\*\||\|&\)\)\@!\|ifdef\>\|ifndef\>\)" skip="\\$" end="^\s*\(%:\|#\)\s*endif\>" containedin=cCppOutElse,cCppInIf,cCppInSkip contains=TOP,cPreProc
endif
syn region    cIncluded    display contained start=+"+ skip=+\\\\\|\\"+ end=+"+
syn match    cIncluded    display contained "<[^>]*>"
syn match    cInclude    display "^\s*\zs\(%:\|#\)\s*include\>\s*["<]" contains=cIncluded
"syn match cLineSkip    "\\$"
syn cluster    cPreProcGroup    contains=cPreCondit,cIncluded,cInclude,cDefine,cErrInParen,cErrInBracket,cUserLabel,cSpecial,cOctalZero,cCppOutWrapper,cCppInWrapper,@cCppOutInGroup,cFormat,cNumber,cFloat,cOctal,cOctalError,cNumbersCom,cString,cCommentSkip,cCommentString,cComment2String,@cCommentGroup,cCommentStartError,cParen,cBracket,cMulti,cBadBlock
syn region    cDefine        start="^\s*\zs\(%:\|#\)\s*\(define\|undef\)\>" skip="\\$" end="$" keepend contains=ALLBUT,@cPreProcGroup,@Spell
syn region    cPreProc    start="^\s*\zs\(%:\|#\)\s*\(pragma\>\|line\>\|warning\>\|warn\>\|error\>\)" skip="\\$" end="$" keepend contains=ALLBUT,@cPreProcGroup,@Spell

" Highlight User Labels
syn cluster    cMultiGroup    contains=cIncluded,cSpecial,cCommentSkip,cCommentString,cComment2String,@cCommentGroup,cCommentStartError,cUserCont,cUserLabel,cBitField,cOctalZero,cCppOutWrapper,cCppInWrapper,@cCppOutInGroup,cFormat,cNumber,cFloat,cOctal,cOctalError,cNumbersCom,cCppParen,cCppBracket,cCppString
if s:ft ==# 'c' || exists("cpp_no_cpp11")
  syn region    cMulti        transparent start='?' skip='::' end=':' contains=ALLBUT,@cMultiGroup,@Spell,@cStringGroup
endif
" Avoid matching foo::bar() in C++ by requiring that the next char is not ':'
syn cluster    cLabelGroup    contains=cUserLabel
syn match    cUserCont    display "^\s*\zs\I\i*\s*:$" contains=@cLabelGroup
syn match    cUserCont    display ";\s*\zs\I\i*\s*:$" contains=@cLabelGroup
if s:ft ==# 'cpp'
  syn match    cUserCont    display "^\s*\zs\%(class\|struct\|enum\)\@!\I\i*\s*:[^:]"me=e-1 contains=@cLabelGroup
  syn match    cUserCont    display ";\s*\zs\%(class\|struct\|enum\)\@!\I\i*\s*:[^:]"me=e-1 contains=@cLabelGroup
else
  syn match    cUserCont    display "^\s*\zs\I\i*\s*:[^:]"me=e-1 contains=@cLabelGroup
  syn match    cUserCont    display ";\s*\zs\I\i*\s*:[^:]"me=e-1 contains=@cLabelGroup
endif

syn match    cUserLabel    display "\I\i*" contained

" Avoid recognizing most bitfields as labels
syn match    cBitField    display "^\s*\zs\I\i*\s*:\s*[1-9]"me=e-1 contains=cType
syn match    cBitField    display ";\s*\zs\I\i*\s*:\s*[1-9]"me=e-1 contains=cType

if exists("c_minlines")
  let b:c_minlines = c_minlines
else
  if !exists("c_no_if0")
    let b:c_minlines = 50    " #if 0 constructs can be long
  else
    let b:c_minlines = 15    " mostly for () constructs
  endif
endif
if exists("c_curly_error")
  syn sync fromstart
else
  exec "syn sync ccomment cComment minlines=" . b:c_minlines
endif

" Define the default highlighting.
" Only used when an item doesn't have highlighting yet
hi def link cFormat        cSpecial
hi def link cCppString        cString
hi def link cCommentL        cComment
hi def link cCommentStart    cComment
hi def link cLabel        Label
hi def link cUserLabel        Label
hi def link cConditional    Conditional
hi def link cRepeat        Repeat
hi def link cCharacter        Character
hi def link cSpecialCharacter    cSpecial
hi def link cNumber        Number
hi def link cOctal        Number
hi def link cOctalZero        PreProc     " link this to Error if you want
hi def link cFloat        Float
hi def link cOctalError        cError
hi def link cParenError        cError
hi def link cErrInParen        cError
hi def link cErrInBracket    cError
hi def link cCommentError    cError
hi def link cCommentStartError    cError
hi def link cSpaceError        cError
hi def link cSpecialError    cError
hi def link cCurlyError        cError
hi def link cOperator        Operator
hi def link cStructure        Structure
hi def link cStorageClass    StorageClass
hi def link cInclude        Include
hi def link cPreProc        PreProc
hi def link cDefine        Macro
hi def link cIncluded        cString
hi def link cError        Error
hi def link cStatement        Statement
hi def link cCppInWrapper    cCppOutWrapper
hi def link cCppOutWrapper    cPreCondit
hi def link cPreConditMatch    cPreCondit
hi def link cPreCondit        PreCondit
hi def link cType        Type
hi def link cConstant        Constant
hi def link cCommentString    cString
hi def link cComment2String    cString
hi def link cCommentSkip    cComment
hi def link cString        String
hi def link cComment        Comment
hi def link cSpecial        SpecialChar
hi def link cTodo        Todo
hi def link cBadContinuation    Error
hi def link cCppOutSkip        cCppOutIf2
hi def link cCppInElse2        cCppOutIf2
hi def link cCppOutIf2        cCppOut
hi def link cCppOut        Comment

let b:current_syntax = "c"

unlet s:ft

let &cpo = s:cpo_save
unlet s:cpo_save
" vim: ts=8


"highlight Functions
"highlight Functions
syn match cFunctions "\<[a-zA-Z_][a-zA-Z_0-9]*\>[^()]*)("me=e-2
syn match cFunctions "\<[a-zA-Z_][a-zA-Z_0-9]*\>\s*("me=e-1
hi cFunctions guifg=#7fd02e cterm=bold ctermfg=yellow
syn match cClass "\<[a-zA-Z_][a-zA-Z_0-9]*\>::"me=e-2
hi cClass guifg=#7fd02e cterm=bold ctermfg=yellow
""syn match cFunctions display "\<[a-zA-Z_][a-zA-Z_0-9]*\>[^()]*)("me=e-2
"syn match cFunctions display "\<[a-zA-Z_][a-zA-Z_0-9]*\>\s*("me=e-1
"hi cFunctions ctermfg=3 guifg=goldenrod
""hi cFunctions gui=NONE cterm=bold 聽ctermfg=white
"
"
""syn match cFunctions display "[a-zA-Z_]\{-1,}\s\{-0,}(\{1}"ms=s,me=e-1
""hi def link cFunctions Title
"

"========================================================
" Highlight All Math Operator
"========================================================
" C math operators
syn match cMathOperator display "[-+*%=<>(){};|.,&!^~:]"
"" C pointer operators
syn match cPointerOperator display "->/|/."
"" C logical operators - boolean results
syn match cLogicalOperator display "[!<>]=/="
syn match cLogicalOperator display "==/|/<=/|/>=/|/!="
"" C bit operators
"syn match cBinaryOperator display"/(&/||/|/^/|<</|>>/)=/="
""syn match cBinaryOperator display "/~"
""syn match cBinaryOperatorError display "/~="
"" More C logical operators - highlight in preference to binary
"syn match cLogicalOperator display "&&/|||"
"syn match cLogicalOperatorError display "/(&&/|||/)="


" Math Operator
hi cMathOperator guifg=#3EFFE2
hi cPointerOperator guifg=#3EFFE2
hi cLogicalOperator guifg=#3EFFE2
"hi cBinaryOperator guifg=#3EFFE2
"hi cBinaryOperatorError guifg=#3EFFE2
"hi cLogicalOperator guifg=#3EFFE2
"hi cLogicalOperatorError guifg=#3EFFE2
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