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+" Vim syntax file
+" Language: awk, nawk, gawk, mawk
+" Maintainer: Antonio Colombo <antonio.colombo@jrc.it>
+" Last Change: 2002 Jun 23
+
+" AWK ref. is: Alfred V. Aho, Brian W. Kernighan, Peter J. Weinberger
+" The AWK Programming Language, Addison-Wesley, 1988
+
+" GAWK ref. is: Arnold D. Robbins
+" Effective AWK Programming, Third Edition, O'Reilly, 2001
+
+" MAWK is a "new awk" meaning it implements AWK ref.
+" mawk conforms to the Posix 1003.2 (draft 11.3)
+" definition of the AWK language which contains a few features
+" not described in the AWK book, and mawk provides a small number of extensions.
+
+" TODO:
+" Dig into the commented out syntax expressions below.
+
+" For version 5.x: Clear all syntax items
+" For version 6.x: Quit when a syntax file was already loaded
+if version < 600
+ syn clear
+elseif exists("b:current_syntax")
+ finish
+endif
+
+" A bunch of useful Awk keywords
+" AWK ref. p. 188
+syn keyword awkStatement break continue delete exit
+syn keyword awkStatement function getline next
+syn keyword awkStatement print printf return
+" GAWK ref. p. 117
+syn keyword awkStatement nextfile
+" AWK ref. p. 42, GAWK ref. p. 142-166
+syn keyword awkFunction atan2 close cos exp fflush int log rand sin sqrt srand
+syn keyword awkFunction gsub index length match split sprintf sub
+syn keyword awkFunction substr system
+" GAWK ref. p. 142-166
+syn keyword awkFunction asort gensub mktime strftime strtonum systime
+syn keyword awkFunction tolower toupper
+syn keyword awkFunction and or xor compl lshift rshift
+syn keyword awkFunction dcgettext bindtextdomain
+
+syn keyword awkConditional if else
+syn keyword awkRepeat while for
+
+syn keyword awkTodo contained TODO
+
+syn keyword awkPatterns BEGIN END
+" AWK ref. p. 36
+syn keyword awkVariables ARGC ARGV FILENAME FNR FS NF NR
+syn keyword awkVariables OFMT OFS ORS RLENGTH RS RSTART SUBSEP
+" GAWK ref. p. 120-126
+syn keyword awkVariables ARGIND BINMODE CONVFMT ENVIRON ERRNO
+syn keyword awkVariables FIELDWIDTHS IGNORECASE LINT PROCINFO
+syn keyword awkVariables RT RLENGTH TEXTDOMAIN
+
+syn keyword awkRepeat do
+
+" Octal format character.
+syn match awkSpecialCharacter display contained "\\[0-7]\{1,3\}"
+syn keyword awkStatement func nextfile
+" Hex format character.
+syn match awkSpecialCharacter display contained "\\x[0-9A-Fa-f]\+"
+
+syn match awkFieldVars "\$\d\+"
+
+"catch errors caused by wrong parenthesis
+syn region awkParen transparent start="(" end=")" contains=ALLBUT,awkParenError,awkSpecialCharacter,awkArrayElement,awkArrayArray,awkTodo,awkRegExp,awkBrktRegExp,awkBrackets,awkCharClass
+syn match awkParenError display ")"
+syn match awkInParen display contained "[{}]"
+
+" 64 lines for complex &&'s, and ||'s in a big "if"
+syn sync ccomment awkParen maxlines=64
+
+" Search strings & Regular Expressions therein.
+syn region awkSearch oneline start="^[ \t]*/"ms=e start="\(,\|!\=\~\)[ \t]*/"ms=e skip="\\\\\|\\/" end="/" contains=awkBrackets,awkRegExp,awkSpecialCharacter
+syn region awkBrackets contained start="\[\^\]\="ms=s+2 start="\[[^\^]"ms=s+1 end="\]"me=e-1 contains=awkBrktRegExp,awkCharClass
+syn region awkSearch oneline start="[ \t]*/"hs=e skip="\\\\\|\\/" end="/" contains=awkBrackets,awkRegExp,awkSpecialCharacter
+
+syn match awkCharClass contained "\[:[^:\]]*:\]"
+syn match awkBrktRegExp contained "\\.\|.\-[^]]"
+syn match awkRegExp contained "/\^"ms=s+1
+syn match awkRegExp contained "\$/"me=e-1
+syn match awkRegExp contained "[?.*{}|+]"
+
+" String and Character constants
+" Highlight special characters (those which have a backslash) differently
+syn region awkString start=+"+ skip=+\\\\\|\\"+ end=+"+ contains=awkSpecialCharacter,awkSpecialPrintf
+syn match awkSpecialCharacter contained "\\."
+
+" Some of these combinations may seem weird, but they work.
+syn match awkSpecialPrintf contained "%[-+ #]*\d*\.\=\d*[cdefgiosuxEGX%]"
+
+" Numbers, allowing signs (both -, and +)
+" Integer number.
+syn match awkNumber display "[+-]\=\<\d\+\>"
+" Floating point number.
+syn match awkFloat display "[+-]\=\<\d\+\.\d+\>"
+" Floating point number, starting with a dot.
+syn match awkFloat display "[+-]\=\<.\d+\>"
+syn case ignore
+"floating point number, with dot, optional exponent
+syn match awkFloat display "\<\d\+\.\d*\(e[-+]\=\d\+\)\=\>"
+"floating point number, starting with a dot, optional exponent
+syn match awkFloat display "\.\d\+\(e[-+]\=\d\+\)\=\>"
+"floating point number, without dot, with exponent
+syn match awkFloat display "\<\d\+e[-+]\=\d\+\>"
+syn case match
+
+"syn match awkIdentifier "\<[a-zA-Z_][a-zA-Z0-9_]*\>"
+
+" Arithmetic operators: +, and - take care of ++, and --
+"syn match awkOperator "+\|-\|\*\|/\|%\|="
+"syn match awkOperator "+=\|-=\|\*=\|/=\|%="
+"syn match awkOperator "^\|^="
+
+" Comparison expressions.
+"syn match awkExpression "==\|>=\|=>\|<=\|=<\|\!="
+"syn match awkExpression "\~\|\!\~"
+"syn match awkExpression "?\|:"
+"syn keyword awkExpression in
+
+" Boolean Logic (OR, AND, NOT)
+"syn match awkBoolLogic "||\|&&\|\!"
+
+" This is overridden by less-than & greater-than.
+" Put this above those to override them.
+" Put this in a 'match "\<printf\=\>.*;\="' to make it not override
+" less/greater than (most of the time), but it won't work yet because
+" keywords allways have precedence over match & region.
+" File I/O: (print foo, bar > "filename") & for nawk (getline < "filename")
+"syn match awkFileIO contained ">"
+"syn match awkFileIO contained "<"
+
+" Expression separators: ';' and ','
+syn match awkSemicolon ";"
+syn match awkComma ","
+
+syn match awkComment "#.*" contains=awkTodo
+
+syn match awkLineSkip "\\$"
+
+" Highlight array element's (recursive arrays allowed).
+" Keeps nested array names' separate from normal array elements.
+" Keeps numbers separate from normal array elements (variables).
+syn match awkArrayArray contained "[^][, \t]\+\["me=e-1
+syn match awkArrayElement contained "[^][, \t]\+"
+syn region awkArray transparent start="\[" end="\]" contains=awkArray,awkArrayElement,awkArrayArray,awkNumber,awkFloat
+
+" 10 should be enough.
+" (for the few instances where it would be more than "oneline")
+syn sync ccomment awkArray maxlines=10
+
+" define the default highlighting
+" For version 5.7 and earlier: only when not done already
+" For version 5.8 and later: only when an item doesn't have highlightling yet
+if version >= 508 || !exists("did_awk_syn_inits")
+ if version < 508
+ let did_awk_syn_inits = 1
+ command -nargs=+ HiLink hi link <args>
+ else
+ command -nargs=+ HiLink hi def link <args>
+ endif
+
+ HiLink awkConditional Conditional
+ HiLink awkFunction Function
+ HiLink awkRepeat Repeat
+ HiLink awkStatement Statement
+
+ HiLink awkString String
+ HiLink awkSpecialPrintf Special
+ HiLink awkSpecialCharacter Special
+
+ HiLink awkSearch String
+ HiLink awkBrackets awkRegExp
+ HiLink awkBrktRegExp awkNestRegExp
+ HiLink awkCharClass awkNestRegExp
+ HiLink awkNestRegExp Keyword
+ HiLink awkRegExp Special
+
+ HiLink awkNumber Number
+ HiLink awkFloat Float
+
+ HiLink awkFileIO Special
+ "HiLink awkOperator Special
+ "HiLink awkExpression Special
+ HiLink awkBoolLogic Special
+
+ HiLink awkPatterns Special
+ HiLink awkVariables Special
+ HiLink awkFieldVars Special
+
+ HiLink awkLineSkip Special
+ HiLink awkSemicolon Special
+ HiLink awkComma Special
+ "HiLink awkIdentifier Identifier
+
+ HiLink awkComment Comment
+ HiLink awkTodo Todo
+
+ " Change this if you want nested array names to be highlighted.
+ HiLink awkArrayArray awkArray
+ HiLink awkArrayElement Special
+
+ HiLink awkParenError awkError
+ HiLink awkInParen awkError
+ HiLink awkError Error
+
+ delcommand HiLink
+endif
+
+let b:current_syntax = "awk"
+
+" vim: ts=8