" Vim syntax file
" Language: awk, nawk, gawk, mawk
" Maintainer: Antonio Colombo <azc100@gmail.com>
" Last Change: 2016 Sep 05
" 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
" Effective AWK Programming, Fourth Edition, O'Reilly, 2015
" (also available and updated with the gawk source distribution)
" 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.
" Quit when a syntax file was already loaded
if exists("b:current_syntax")
finish
endif
let s:cpo_save = &cpo
set cpo&vim
" 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. Chapter 7-9
syn keyword awkStatement switch nextfile
syn keyword awkStatement func
"
" GAWK ref. Chapter 9, Functions
" Numeric Functions
syn keyword awkFunction atan2 cos exp int intdiv log rand sin sqrt srand
" String Manipulation Functions
syn keyword awkFunction asort asort1 gensub gsub index length match
syn keyword awkFunction patsplit split sprintf strtonum sub substr
syn keyword awkFunction tolower toupper
" Input Output Functions
syn keyword awkFunction close fflush system
" Time Functions
syn keyword awkFunction mktime strftime systime
" Bit Manipulation Functions
syn keyword awkFunction and compl lshift or rshift xor
" Getting Type Functions
syn keyword awkFunction isarray typeof
" String-Translation Functions
syn keyword awkFunction bindtextdomain dcgettext dcngetext
syn keyword awkConditional if else
syn keyword awkRepeat while for do
syn keyword awkTodo contained TODO
syn keyword awkPatterns BEGIN END BEGINFILE ENDFILE
" GAWK ref. Chapter 7
" Built-in Variables That Control awk
syn keyword awkVariables BINMODE CONVFMT FIELDWIDTHS FPAT FS
syn keyword awkVariables IGNORECASE LINT OFMT OFS ORS PREC
syn keyword awkVariables ROUNDMODE RS SUBSEP TEXTDOMAIN
" Built-in Variables That Convey Information
syn keyword awkVariables ARGC ARGV ARGIND ENVIRON ERRNO FILENAME
syn keyword awkVariables FNR NF FUNCTAB NR PROCINFO RLENGTH RSTART
syn keyword awkVariables RT SYMTAB
" Arithmetic operators: +, and - take care of ++, and --
syn match awkOperator "+\|-\|\*\|/\|%\|="
syn match awkOperator "+=\|-=\|\*=\|/=\|%="
syn match awkOperator "\^\|\^="
" Octal format character.
syn match awkSpecialCharacter display contained "\\[0-7]\{1,3\}"
" 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,awkComment
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=@Spell,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_]*\>"
" 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 always 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=@Spell,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.
hi def link awkConditional Conditional
hi def link awkFunction Function
hi def link awkRepeat Repeat
hi def link awkStatement Statement
hi def link awkString String
hi def link awkSpecialPrintf Special
hi def link awkSpecialCharacter Special
hi def link awkSearch String
hi def link awkBrackets awkRegExp
hi def link awkBrktRegExp awkNestRegExp
hi def link awkCharClass awkNestRegExp
hi def link awkNestRegExp Keyword
hi def link awkRegExp Special
hi def link awkNumber Number
hi def link awkFloat Float
hi def link awkFileIO Special
hi def link awkOperator Special
hi def link awkExpression Special
hi def link awkBoolLogic Special
hi def link awkPatterns Special
hi def link awkVariables Special
hi def link awkFieldVars Special
hi def link awkLineSkip Special
hi def link awkSemicolon Special
hi def link awkComma Special
hi def link awkIdentifier Identifier
hi def link awkComment Comment
hi def link awkTodo Todo
" Change this if you want nested array names to be highlighted.
hi def link awkArrayArray awkArray
hi def link awkArrayElement Special
hi def link awkParenError awkError
hi def link awkInParen awkError
hi def link awkError Error
let b:current_syntax = "awk"
let &cpo = s:cpo_save
unlet s:cpo_save
" vim: ts=8
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