" Vim syntax file
" Language:    FORTH
" Maintainer:  Christian V. J. Brüssow <cvjb@cvjb.de>
" Last Change: Sa 07 Jan 2012 21:30:55 CET
" Filenames:   *.fs,*.ft
" URL:	       http://www.cvjb.de/comp/vim/forth.vim

" $Id: forth.vim,v 1.13 2012/01/07 21:31:31 bruessow Exp $

" The list of keywords is incomplete, compared with the offical ANS
" wordlist. If you use this language, please improve it, and send me
" the patches.
"
" Before sending me patches, please download the newest version of this file
" from http://www.cvjb.de/comp/vim/forth.vim or http://www.vim.org/ (search
" for forth.vim).

" Many Thanks to...
" 
" 2012-01-07:
" Thilo Six <T.Six at gmx dot de> send a patch for cpoptions.
" See the discussion at http://thread.gmane.org/gmane.editors.vim.devel/32151
"
" 2009-06-28:
" Josh Grams send a patch to allow the parenthesis comments at the
" beginning of a line. That patch also fixed a typo in one of the
" comments.
"
" 2008-02-09:
" Shawn K. Quinn <sjquinn at speakeasy dot net> send a big patch with
" new words commonly used in Forth programs or defined by GNU Forth.
"
" 2007-07-11:
" Benjamin Krill <ben at codiert dot org> send me a patch
" to highlight space errors.
" You can toggle this feature on through setting the
" flag forth_space_errors in you vimrc. If you have switched it on,
" you can turn off highlighting of trailing spaces in comments by
" setting forth_no_trail_space_error in your vimrc. If you do not want
" the highlighting of a tabulator following a space in comments, you
" can turn this off by setting forth_no_tab_space_error.
"
" 2006-05-25:
" Bill McCarthy <WJMc@...> and Ilya Sher <ilya-vim@...>
" Who found a bug in the ccomment line in 2004!!!
" I'm really very sorry, that it has taken two years to fix that
" in the offical version of this file. Shame on me.
" I think my face will be red the next ten years...
"
" 2006-05-21:
" Thomas E. Vaughan <tevaugha at ball dot com> send me a patch
" for the parenthesis comment word, so words with a trailing
" parenthesis will not start the highlighting for such comments.
"
" 2003-05-10:
" Andrew Gaul <andrew at gaul.org> send me a patch for
" forthOperators.
"
" 2003-04-03:
" Ron Aaron <ron at ronware dot org> made updates for an
" improved Win32Forth support.
"
" 2002-04-22:
" Charles Shattuck <charley at forth dot org> helped me to settle up with the
" binary and hex number highlighting.
"
" 2002-04-20:
" Charles Shattuck <charley at forth dot org> send me some code for correctly
" highlighting char and [char] followed by an opening paren. He also added
" some words for operators, conditionals, and definitions; and added the
" highlighting for s" and c".
"
" 2000-03-28:
" John Providenza <john at probo dot com> made improvements for the
" highlighting of strings, and added the code for highlighting hex numbers.
"


" For version 5.x: Clear all syntax items
" For version 6.x: Quit when a syntax file was already loaded
if version < 600
    syntax clear
elseif exists("b:current_syntax")
    finish
endif

let s:cpo_save = &cpo
set cpo&vim

" Synchronization method
syn sync ccomment
syn sync maxlines=200

" I use gforth, so I set this to case ignore
syn case ignore

" Some special, non-FORTH keywords
syn keyword forthTodo contained TODO FIXME XXX
syn match forthTodo contained 'Copyright\(\s([Cc])\)\=\(\s[0-9]\{2,4}\)\='

" Characters allowed in keywords
" I don't know if 128-255 are allowed in ANS-FORTH
if version >= 600
    setlocal iskeyword=!,@,33-35,%,$,38-64,A-Z,91-96,a-z,123-126,128-255
else
    set iskeyword=!,@,33-35,%,$,38-64,A-Z,91-96,a-z,123-126,128-255
endif

" when wanted, highlight trailing white space
if exists("forth_space_errors")
    if !exists("forth_no_trail_space_error")
        syn match forthSpaceError display excludenl "\s\+$"
    endif
    if !exists("forth_no_tab_space_error")
        syn match forthSpaceError display " \+\t"me=e-1
    endif
endif

" Keywords

" basic mathematical and logical operators
syn keyword forthOperators + - * / MOD /MOD NEGATE ABS MIN MAX
syn keyword forthOperators AND OR XOR NOT LSHIFT RSHIFT INVERT 2* 2/ 1+
syn keyword forthOperators 1- 2+ 2- 8* UNDER+
syn keyword forthOperators M+ */ */MOD M* UM* M*/ UM/MOD FM/MOD SM/REM
syn keyword forthOperators D+ D- DNEGATE DABS DMIN DMAX D2* D2/
syn keyword forthOperators F+ F- F* F/ FNEGATE FABS FMAX FMIN FLOOR FROUND
syn keyword forthOperators F** FSQRT FEXP FEXPM1 FLN FLNP1 FLOG FALOG FSIN
syn keyword forthOperators FCOS FSINCOS FTAN FASIN FACOS FATAN FATAN2 FSINH
syn keyword forthOperators FCOSH FTANH FASINH FACOSH FATANH F2* F2/ 1/F
syn keyword forthOperators F~REL F~ABS F~
syn keyword forthOperators 0< 0<= 0<> 0= 0> 0>= < <= <> = > >= U< U<=
syn keyword forthOperators U> U>= D0< D0<= D0<> D0= D0> D0>= D< D<= D<>
syn keyword forthOperators D= D> D>= DU< DU<= DU> DU>= WITHIN ?NEGATE
syn keyword forthOperators ?DNEGATE

" stack manipulations
syn keyword forthStack DROP NIP DUP OVER TUCK SWAP ROT -ROT ?DUP PICK ROLL
syn keyword forthStack 2DROP 2NIP 2DUP 2OVER 2TUCK 2SWAP 2ROT 2-ROT
syn keyword forthStack 3DUP 4DUP 5DUP 3DROP 4DROP 5DROP 8DROP 4SWAP 4ROT
syn keyword forthStack 4-ROT 4TUCK 8SWAP 8DUP
syn keyword forthRStack >R R> R@ RDROP 2>R 2R> 2R@ 2RDROP
syn keyword forthRstack 4>R 4R> 4R@ 4RDROP
syn keyword forthFStack FDROP FNIP FDUP FOVER FTUCK FSWAP FROT

" stack pointer manipulations
syn keyword forthSP SP@ SP! FP@ FP! RP@ RP! LP@ LP!

" address operations
syn keyword forthMemory @ ! +! C@ C! 2@ 2! F@ F! SF@ SF! DF@ DF!
syn keyword forthAdrArith CHARS CHAR+ CELLS CELL+ CELL ALIGN ALIGNED FLOATS
syn keyword forthAdrArith FLOAT+ FLOAT FALIGN FALIGNED SFLOATS SFLOAT+
syn keyword forthAdrArith SFALIGN SFALIGNED DFLOATS DFLOAT+ DFALIGN DFALIGNED
syn keyword forthAdrArith MAXALIGN MAXALIGNED CFALIGN CFALIGNED
syn keyword forthAdrArith ADDRESS-UNIT-BITS ALLOT ALLOCATE HERE
syn keyword forthMemBlks MOVE ERASE CMOVE CMOVE> FILL BLANK

" conditionals
syn keyword forthCond IF ELSE ENDIF THEN CASE OF ENDOF ENDCASE ?DUP-IF
syn keyword forthCond ?DUP-0=-IF AHEAD CS-PICK CS-ROLL CATCH THROW WITHIN

" iterations
syn keyword forthLoop BEGIN WHILE REPEAT UNTIL AGAIN
syn keyword forthLoop ?DO LOOP I J K +DO U+DO -DO U-DO DO +LOOP -LOOP
syn keyword forthLoop UNLOOP LEAVE ?LEAVE EXIT DONE FOR NEXT

" new words
syn match forthClassDef '\<:class\s*[^ \t]\+\>'
syn match forthObjectDef '\<:object\s*[^ \t]\+\>'
syn match forthColonDef '\<:m\?\s*[^ \t]\+\>'
syn keyword forthEndOfColonDef ; ;M ;m
syn keyword forthEndOfClassDef ;class
syn keyword forthEndOfObjectDef ;object
syn keyword forthDefine CONSTANT 2CONSTANT FCONSTANT VARIABLE 2VARIABLE
syn keyword forthDefine FVARIABLE CREATE USER VALUE TO DEFER IS DOES> IMMEDIATE
syn keyword forthDefine COMPILE-ONLY COMPILE RESTRICT INTERPRET POSTPONE EXECUTE
syn keyword forthDefine LITERAL CREATE-INTERPRET/COMPILE INTERPRETATION>
syn keyword forthDefine <INTERPRETATION COMPILATION> <COMPILATION ] LASTXT
syn keyword forthDefine COMP' POSTPONE, FIND-NAME NAME>INT NAME?INT NAME>COMP
syn keyword forthDefine NAME>STRING STATE C; CVARIABLE
syn keyword forthDefine , 2, F, C,
syn match forthDefine "\[IFDEF]"
syn match forthDefine "\[IFUNDEF]"
syn match forthDefine "\[THEN]"
syn match forthDefine "\[ENDIF]"
syn match forthDefine "\[ELSE]"
syn match forthDefine "\[?DO]"
syn match forthDefine "\[DO]"
syn match forthDefine "\[LOOP]"
syn match forthDefine "\[+LOOP]"
syn match forthDefine "\[NEXT]"
syn match forthDefine "\[BEGIN]"
syn match forthDefine "\[UNTIL]"
syn match forthDefine "\[AGAIN]"
syn match forthDefine "\[WHILE]"
syn match forthDefine "\[REPEAT]"
syn match forthDefine "\[COMP']"
syn match forthDefine "'"
syn match forthDefine '\<\[\>'
syn match forthDefine "\[']"
syn match forthDefine '\[COMPILE]'

" debugging
syn keyword forthDebug PRINTDEBUGDATA PRINTDEBUGLINE
syn match forthDebug "\<\~\~\>"

" Assembler
syn keyword forthAssembler ASSEMBLER CODE END-CODE ;CODE FLUSH-ICACHE C,

" basic character operations
syn keyword forthCharOps (.) CHAR EXPECT FIND WORD TYPE -TRAILING EMIT KEY
syn keyword forthCharOps KEY? TIB CR
" recognize 'char (' or '[char] (' correctly, so it doesn't
" highlight everything after the paren as a comment till a closing ')'
syn match forthCharOps '\<char\s\S\s'
syn match forthCharOps '\<\[char\]\s\S\s'
syn region forthCharOps start=+."\s+ skip=+\\"+ end=+"+

" char-number conversion
syn keyword forthConversion <<# <# # #> #>> #S (NUMBER) (NUMBER?) CONVERT D>F
syn keyword forthConversion D>S DIGIT DPL F>D HLD HOLD NUMBER S>D SIGN >NUMBER
syn keyword forthConversion F>S S>F

" interpreter, wordbook, compiler
syn keyword forthForth (LOCAL) BYE COLD ABORT >BODY >NEXT >LINK CFA >VIEW HERE
syn keyword forthForth PAD WORDS VIEW VIEW> N>LINK NAME> LINK> L>NAME FORGET
syn keyword forthForth BODY> ASSERT( ASSERT0( ASSERT1( ASSERT2( ASSERT3( )
syn region forthForth start=+ABORT"\s+ skip=+\\"+ end=+"+

" vocabularies
syn keyword forthVocs ONLY FORTH ALSO ROOT SEAL VOCS ORDER CONTEXT #VOCS
syn keyword forthVocs VOCABULARY DEFINITIONS

" File keywords
syn keyword forthFileMode R/O R/W W/O BIN
syn keyword forthFileWords OPEN-FILE CREATE-FILE CLOSE-FILE DELETE-FILE
syn keyword forthFileWords RENAME-FILE READ-FILE READ-LINE KEY-FILE
syn keyword forthFileWords KEY?-FILE WRITE-FILE WRITE-LINE EMIT-FILE
syn keyword forthFileWords FLUSH-FILE FILE-STATUS FILE-POSITION
syn keyword forthFileWords REPOSITION-FILE FILE-SIZE RESIZE-FILE
syn keyword forthFileWords SLURP-FILE SLURP-FID STDIN STDOUT STDERR
syn keyword forthBlocks OPEN-BLOCKS USE LOAD --> BLOCK-OFFSET
syn keyword forthBlocks GET-BLOCK-FID BLOCK-POSITION LIST SCR BLOCK
syn keyword forthBlocks BUFER EMPTY-BUFFERS EMPTY-BUFFER UPDATE UPDATED?
syn keyword forthBlocks SAVE-BUFFERS SAVE-BUFFER FLUSH THRU +LOAD +THRU
syn keyword forthBlocks BLOCK-INCLUDED

" numbers
syn keyword forthMath DECIMAL HEX BASE
syn match forthInteger '\<-\=[0-9.]*[0-9.]\+\>'
syn match forthInteger '\<&-\=[0-9.]*[0-9.]\+\>'
" recognize hex and binary numbers, the '$' and '%' notation is for gforth
syn match forthInteger '\<\$\x*\x\+\>' " *1* --- dont't mess
syn match forthInteger '\<\x*\d\x*\>'  " *2* --- this order!
syn match forthInteger '\<%[0-1]*[0-1]\+\>'
syn match forthFloat '\<-\=\d*[.]\=\d\+[DdEe]\d\+\>'
syn match forthFloat '\<-\=\d*[.]\=\d\+[DdEe][-+]\d\+\>'

" XXX If you find this overkill you can remove it. this has to come after the
" highlighting for numbers otherwise it has no effect.
syn region forthComment start='0 \[if\]' end='\[endif\]' end='\[then\]' contains=forthTodo

" Strings
syn region forthString start=+\.*\"+ end=+"+ end=+$+
" XXX
syn region forthString start=+s\"+ end=+"+ end=+$+
syn region forthString start=+c\"+ end=+"+ end=+$+

" Comments
syn match forthComment '\\\s.*$' contains=forthTodo,forthSpaceError
syn region forthComment start='\\S\s' end='.*' contains=forthTodo,forthSpaceError
syn match forthComment '\.(\s[^)]*)' contains=forthTodo,forthSpaceError
syn region forthComment start='\(^\|\s\)\zs(\s' skip='\\)' end=')' contains=forthTodo,forthSpaceError
syn region forthComment start='/\*' end='\*/' contains=forthTodo,forthSpaceError

" Include files
syn match forthInclude '^INCLUDE\s\+\k\+'
syn match forthInclude '^require\s\+\k\+'
syn match forthInclude '^fload\s\+'
syn match forthInclude '^needs\s\+'

" Locals definitions
syn region forthLocals start='{\s' start='{$' end='\s}' end='^}'
syn match forthLocals '{ }' " otherwise, at least two spaces between
syn region forthDeprecated start='locals|' end='|'

" 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 highlighting yet
if version >= 508 || !exists("did_forth_syn_inits")
    if version < 508
	let did_forth_syn_inits = 1
	command -nargs=+ HiLink hi link <args>
    else
	command -nargs=+ HiLink hi def link <args>
    endif

    " The default methods for highlighting. Can be overriden later.
    HiLink forthTodo Todo
    HiLink forthOperators Operator
    HiLink forthMath Number
    HiLink forthInteger Number
    HiLink forthFloat Float
    HiLink forthStack Special
    HiLink forthRstack Special
    HiLink forthFStack Special
    HiLink forthSP Special
    HiLink forthMemory Function
    HiLink forthAdrArith Function
    HiLink forthMemBlks Function
    HiLink forthCond Conditional
    HiLink forthLoop Repeat
    HiLink forthColonDef Define
    HiLink forthEndOfColonDef Define
    HiLink forthDefine Define
    HiLink forthDebug Debug
    HiLink forthAssembler Include
    HiLink forthCharOps Character
    HiLink forthConversion String
    HiLink forthForth Statement
    HiLink forthVocs Statement
    HiLink forthString String
    HiLink forthComment Comment
    HiLink forthClassDef Define
    HiLink forthEndOfClassDef Define
    HiLink forthObjectDef Define
    HiLink forthEndOfObjectDef Define
    HiLink forthInclude Include
    HiLink forthLocals Type " nothing else uses type and locals must stand out
    HiLink forthDeprecated Error " if you must, change to Type
    HiLink forthFileMode Function
    HiLink forthFileWords Statement
    HiLink forthBlocks Statement
    HiLink forthSpaceError Error

    delcommand HiLink
endif

let b:current_syntax = "forth"

let &cpo = s:cpo_save
unlet s:cpo_save
" vim:ts=8:sw=4:nocindent:smartindent: