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" Vim syntax file
" Language: PROLOG
" Maintainer: Anton Kochkov <anton.kochkov@gmail.com>
" Last Change: 2021 Jan 05
" There are two sets of highlighting in here:
" If the "prolog_highlighting_clean" variable exists, it is rather sparse.
" Otherwise you get more highlighting.
"
" You can also set the "prolog_highlighting_no_keyword" variable. If set,
" keywords will not be highlighted.
" quit when a syntax file was already loaded
if exists("b:current_syntax")
finish
endif
" Prolog is case sensitive.
syn case match
" Very simple highlighting for comments, clause heads and
" character codes. It respects prolog strings and atoms.
syn region prologCComment start=+/\*+ end=+\*/+ contains=@Spell
syn match prologComment +%.*+ contains=@Spell
if !exists("prolog_highlighting_no_keyword")
syn keyword prologKeyword module meta_predicate multifile dynamic
endif
syn match prologCharCode +0'\\\=.+
syn region prologString start=+"+ skip=+\\\\\|\\"+ end=+"+ contains=@Spell
syn region prologAtom start=+'+ skip=+\\\\\|\\'+ end=+'+
syn region prologClause matchgroup=prologClauseHead start=+^\s*[a-z]\w*+ matchgroup=Normal end=+\.\s\|\.$+ contains=ALLBUT,prologClause contains=@NoSpell
if !exists("prolog_highlighting_clean")
" some keywords
" some common predicates are also highlighted as keywords
" is there a better solution?
if !exists("prolog_highlighting_no_keyword")
syn keyword prologKeyword abolish current_output peek_code
syn keyword prologKeyword append current_predicate put_byte
syn keyword prologKeyword arg current_prolog_flag put_char
syn keyword prologKeyword asserta fail put_code
syn keyword prologKeyword assertz findall read
syn keyword prologKeyword at_end_of_stream float read_term
syn keyword prologKeyword atom flush_output repeat
syn keyword prologKeyword atom_chars functor retract
syn keyword prologKeyword atom_codes get_byte set_input
syn keyword prologKeyword atom_concat get_char set_output
syn keyword prologKeyword atom_length get_code set_prolog_flag
syn keyword prologKeyword atomic halt set_stream_position
syn keyword prologKeyword bagof integer setof
syn keyword prologKeyword call is stream_property
syn keyword prologKeyword catch nl sub_atom
syn keyword prologKeyword char_code nonvar throw
syn keyword prologKeyword char_conversion number true
syn keyword prologKeyword clause number_chars unify_with_occurs_check
syn keyword prologKeyword close number_codes var
syn keyword prologKeyword compound once write
syn keyword prologKeyword copy_term op write_canonical
syn keyword prologKeyword current_char_conversion open write_term
syn keyword prologKeyword current_input peek_byte writeq
syn keyword prologKeyword current_op peek_char
endif
syn match prologOperator "=\\=\|=:=\|\\==\|=<\|==\|>=\|\\=\|\\+\|=\.\.\|<\|>\|="
syn match prologAsIs "===\|\\===\|<=\|=>"
syn match prologNumber "\<\d*\>'\@!"
syn match prologNumber "\<0[xX]\x*\>'\@!"
syn match prologCommentError "\*/"
syn match prologSpecialCharacter ";"
syn match prologSpecialCharacter "!"
syn match prologSpecialCharacter ":-"
syn match prologSpecialCharacter "-->"
syn match prologQuestion "?-.*\." contains=prologNumber
endif
syn sync maxlines=50
" Define the default highlighting.
" Only when an item doesn't have highlighting yet
" The default highlighting.
hi def link prologComment Comment
hi def link prologCComment Comment
hi def link prologCharCode Special
if exists ("prolog_highlighting_clean")
hi def link prologKeyword Statement
hi def link prologClauseHead Statement
hi def link prologClause Normal
else
hi def link prologKeyword Keyword
hi def link prologClauseHead Constant
hi def link prologClause Normal
hi def link prologQuestion PreProc
hi def link prologSpecialCharacter Special
hi def link prologNumber Number
hi def link prologAsIs Normal
hi def link prologCommentError Error
hi def link prologAtom String
hi def link prologString String
hi def link prologOperator Operator
endif
let b:current_syntax = "prolog"
" vim: ts=8
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