1" Vim syntax file
2" Language:    PROLOG
3" Maintainers: Thomas Koehler <jean-luc@picard.franken.de>
4" Last Change: 2009 Dec 04
5" URL:	       http://gott-gehabt.de/800_wer_wir_sind/thomas/Homepage/Computer/vim/syntax/prolog.vim
6
7" There are two sets of highlighting in here:
8" If the "prolog_highlighting_clean" variable exists, it is rather sparse.
9" Otherwise you get more highlighting.
10
11" Quit when a syntax file was already loaded
12if version < 600
13   syntax clear
14elseif exists("b:current_syntax")
15  finish
16endif
17
18" Prolog is case sensitive.
19syn case match
20
21" Very simple highlighting for comments, clause heads and
22" character codes.  It respects prolog strings and atoms.
23
24syn region   prologCComment	start=+/\*+ end=+\*/+
25syn match    prologComment	+%.*+
26
27syn keyword  prologKeyword	module meta_predicate multifile dynamic
28syn match    prologCharCode	+0'\\\=.+
29syn region   prologString      start=+"+ skip=+\\\\\|\\"+ end=+"+
30syn region   prologAtom                start=+'+ skip=+\\\\\|\\'+ end=+'+
31syn region   prologClauseHead   start=+^[a-z][^(]*(+ skip=+\.[^		]+ end=+:-\|\.$\|\.[	 ]\|-->+ contains=prologComment,prologCComment,prologString
32
33if !exists("prolog_highlighting_clean")
34
35  " some keywords
36  " some common predicates are also highlighted as keywords
37  " is there a better solution?
38  syn keyword prologKeyword   abolish current_output  peek_code
39  syn keyword prologKeyword   append  current_predicate       put_byte
40  syn keyword prologKeyword   arg     current_prolog_flag     put_char
41  syn keyword prologKeyword   asserta fail    put_code
42  syn keyword prologKeyword   assertz findall read
43  syn keyword prologKeyword   at_end_of_stream	      float   read_term
44  syn keyword prologKeyword   atom    flush_output    repeat
45  syn keyword prologKeyword   atom_chars      functor retract
46  syn keyword prologKeyword   atom_codes      get_byte	      set_input
47  syn keyword prologKeyword   atom_concat     get_char	      set_output
48  syn keyword prologKeyword   atom_length     get_code	      set_prolog_flag
49  syn keyword prologKeyword   atomic  halt    set_stream_position
50  syn keyword prologKeyword   bagof   integer setof
51  syn keyword prologKeyword   call    is      stream_property
52  syn keyword prologKeyword   catch   nl      sub_atom
53  syn keyword prologKeyword   char_code       nonvar  throw
54  syn keyword prologKeyword   char_conversion number  true
55  syn keyword prologKeyword   clause  number_chars    unify_with_occurs_check
56  syn keyword prologKeyword   close   number_codes    var
57  syn keyword prologKeyword   compound	      once    write
58  syn keyword prologKeyword   copy_term       op      write_canonical
59  syn keyword prologKeyword   current_char_conversion open    write_term
60  syn keyword prologKeyword   current_input   peek_byte       writeq
61  syn keyword prologKeyword   current_op      peek_char
62
63  syn match   prologOperator "=\\=\|=:=\|\\==\|=<\|==\|>=\|\\=\|\\+\|<\|>\|="
64  syn match   prologAsIs     "===\|\\===\|<=\|=>"
65
66  syn match   prologNumber	      "\<[0123456789]*\>'\@!"
67  syn match   prologCommentError      "\*/"
68  syn match   prologSpecialCharacter  ";"
69  syn match   prologSpecialCharacter  "!"
70  syn match   prologQuestion	      "?-.*\."	contains=prologNumber
71
72
73endif
74
75syn sync maxlines=50
76
77
78" Define the default highlighting.
79" For version 5.7 and earlier: only when not done already
80" For version 5.8 and later: only when an item doesn't have highlighting yet
81if version >= 508 || !exists("did_prolog_syn_inits")
82  if version < 508
83    let did_prolog_syn_inits = 1
84    command -nargs=+ HiLink hi link <args>
85  else
86    command -nargs=+ HiLink hi def link <args>
87  endif
88
89  " The default highlighting.
90  HiLink prologComment		Comment
91  HiLink prologCComment		Comment
92  HiLink prologCharCode		Special
93
94  if exists ("prolog_highlighting_clean")
95
96    HiLink prologKeyword	Statement
97    HiLink prologClauseHead	Statement
98
99  else
100
101    HiLink prologKeyword	Keyword
102    HiLink prologClauseHead	Constant
103    HiLink prologQuestion	PreProc
104    HiLink prologSpecialCharacter Special
105    HiLink prologNumber		Number
106    HiLink prologAsIs		Normal
107    HiLink prologCommentError	Error
108    HiLink prologAtom		String
109    HiLink prologString		String
110    HiLink prologOperator	Operator
111
112  endif
113
114  delcommand HiLink
115endif
116
117let b:current_syntax = "prolog"
118
119" vim: ts=8
120