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
" String and Character constants
" Highlight special characters (those which have a backslash) differently
syn match cSpecial contained "\\x\x\+\|\\\o\{1,3\}\|\\.\|\\$"
syn region cString start=+"+ skip=+\\\\\|\\"+ end=+"+ contains=cSpecial
syn match cCharacter "'[^\\]'"
syn match cSpecialCharacter "'\\.'"
syn match cSpecialCharacter "'\\\o\{1,3\}'"
"when wanted, highlight trailing white space
if exists("c_space_errors")
syn match cSpaceError "\s*$"
syn match cSpaceError " \+\t"me=e-1
endif
"catch errors caused by wrong parenthesis
syn cluster cParenGroup contains=cParenError,cIncluded,cSpecial,cTodo,cUserCont,cUserLabel,cBitField
syn region cParen transparent start='(' end=')' contains=ALLBUT,@cParenGroup
syn match cParenError ")"
syn match cInParen contained "[{}]"
"integer number, or floating point number without a dot and with "f".
syn case ignore
syn match cNumber "\<\d\+\(u\=l\=\|lu\|f\)\>"
"floating point number, with dot, optional exponent
syn match cFloat "\<\d\+\.\d*\(e[-+]\=\d\+\)\=[fl]\=\>"
"floating point number, starting with a dot, optional exponent
syn match cFloat "\.\d\+\(e[-+]\=\d\+\)\=[fl]\=\>"
"floating point number, without dot, with exponent
syn match cFloat "\<\d\+e[-+]\=\d\+[fl]\=\>"
"hex number
syn match cNumber "\<0x\x\+\(u\=l\=\|lu\)\>"
"syn match cIdentifier "\<[a-z_][a-z0-9_]*\>"
syn case match
" flag an octal number with wrong digits
syn match cOctalError "\<0\o*[89]"
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 :-(
syntax match cCommentSkip contained "^\s*\*\($\|\s\+\)"
syntax region cCommentString contained start=+"+ skip=+\\\\\|\\"+ end=+"+ end=+\*/+me=s-1 contains=cSpecial,cCommentSkip
syntax region cComment2String contained start=+"+ skip=+\\\\\|\\"+ end=+"+ end="$" contains=cSpecial
syntax region cComment start="/\*" end="\*/" contains=cTodo,cCommentString,cCharacter,cNumber,cFloat,cSpaceError
syntax match cComment "//.*" contains=cTodo,cComment2String,cCharacter,cNumber,cSpaceError
else
syn region cComment start="/\*" end="\*/" contains=cTodo,cSpaceError
syn match cComment "//.*" contains=cTodo,cSpaceError
endif
syntax match cCommentError "\*/"
syn keyword cOperator sizeof
syn keyword cType int long short char void size_t
syn keyword cType signed unsigned float double
syn keyword cStructure struct union enum typedef
syn keyword cStorageClass static register auto volatile extern const
syn region cPreCondit start="^\s*#\s*\(if\>\|ifdef\>\|ifndef\>\|elif\>\|else\>\|endif\>\)" skip="\\$" end="$" contains=cComment,cString,cCharacter,cNumber,cCommentError,cSpaceError
syn region cIncluded contained start=+"+ skip=+\\\\\|\\"+ end=+"+
syn match cIncluded contained "<[^>]*>"
syn match cInclude "^\s*#\s*include\>\s*["<]" contains=cIncluded
"syn match cLineSkip "\\$"
syn cluster cPreProcGroup contains=cPreCondit,cIncluded,cInclude,cDefine,cInParen,cUserLabel
syn region cDefine start="^\s*#\s*\(define\>\|undef\>\)" skip="\\$" end="$" contains=ALLBUT,@cPreProcGroup
syn region cPreProc start="^\s*#\s*\(pragma\>\|line\>\|warning\>\|warn\>\|error\>\)" skip="\\$" end="$" contains=ALLBUT,@cPreProcGroup
" Highlight User Labels
syn cluster cMultiGroup contains=cIncluded,cSpecial,cTodo,cUserCont,cUserLabel,cBitField
syn region cMulti transparent start='?' end=':' contains=ALLBUT,@cMultiGroup
" Avoid matching foo::bar() in C++ by requiring that the next char is not ':'
syn match cUserCont "^\s*\I\i*\s*:$" contains=cUserLabel
syn match cUserCont ";\s*\I\i*\s*:$" contains=cUserLabel
syn match cUserCont "^\s*\I\i*\s*:[^:]"me=e-1 contains=cUserLabel
syn match cUserCont ";\s*\I\i*\s*:[^:]"me=e-1 contains=cUserLabel
