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" Vim syntax file
" Language:	PCCTS
" Maintainer:	Scott Bigham <dsb@killerbunnies.org>
" Last Change:	10 Aug 1999

" quit when a syntax file was already loaded
if exists("b:current_syntax")
  finish
endif

" Read the C++ syntax to start with
syn include @cppTopLevel syntax/cpp.vim

syn region pcctsAction matchgroup=pcctsDelim start="<<" end=">>?\=" contains=@cppTopLevel,pcctsRuleRef

syn region pcctsArgBlock matchgroup=pcctsDelim start="\(>\s*\)\=\[" end="\]" contains=@cppTopLevel,pcctsRuleRef

syn region pcctsString start=+"+ skip=+\\\\\|\\"+ end=+"+ contains=pcctsSpecialChar
syn match  pcctsSpecialChar "\\\\\|\\\"" contained

syn region pcctsComment start="/\*" end="\*/" contains=cTodo
syn match  pcctsComment "//.*$" contains=cTodo

syn region pcctsDirective start="^\s*#header\s\+<<" end=">>" contains=pcctsAction keepend
syn match  pcctsDirective "^\s*#parser\>.*$" contains=pcctsString,pcctsComment
syn match  pcctsDirective "^\s*#tokdefs\>.*$" contains=pcctsString,pcctsComment
syn match  pcctsDirective "^\s*#token\>.*$" contains=pcctsString,pcctsAction,pcctsTokenName,pcctsComment
syn region pcctsDirective start="^\s*#tokclass\s\+[A-Z]\i*\s\+{" end="}" contains=pcctsString,pcctsTokenName
syn match  pcctsDirective "^\s*#lexclass\>.*$" contains=pcctsTokenName
syn region pcctsDirective start="^\s*#errclass\s\+[^{]\+\s\+{" end="}" contains=pcctsString,pcctsTokenName
syn match pcctsDirective "^\s*#pred\>.*$" contains=pcctsTokenName,pcctsAction

syn cluster pcctsInRule contains=pcctsString,pcctsRuleName,pcctsTokenName,pcctsAction,pcctsArgBlock,pcctsSubRule,pcctsLabel,pcctsComment

syn region pcctsRule start="\<[a-z][A-Za-z0-9_]*\>\(\s*\[[^]]*\]\)\=\(\s*>\s*\[[^]]*\]\)\=\s*:" end=";" contains=@pcctsInRule

syn region pcctsSubRule matchgroup=pcctsDelim start="(" end=")\(+\|\*\|?\(\s*=>\)\=\)\=" contains=@pcctsInRule contained
syn region pcctsSubRule matchgroup=pcctsDelim start="{" end="}" contains=@pcctsInRule contained

syn match pcctsRuleName  "\<[a-z]\i*\>" contained
syn match pcctsTokenName "\<[A-Z]\i*\>" contained

syn match pcctsLabel "\<\I\i*:\I\i*" contained contains=pcctsLabelHack,pcctsRuleName,pcctsTokenName
syn match pcctsLabel "\<\I\i*:\"\([^\\]\|\\.\)*\"" contained contains=pcctsLabelHack,pcctsString
syn match pcctsLabelHack "\<\I\i*:" contained

syn match pcctsRuleRef "\$\I\i*\>" contained
syn match pcctsRuleRef "\$\d\+\(\.\d\+\)\>" contained

syn keyword pcctsClass     class   nextgroup=pcctsClassName skipwhite
syn match   pcctsClassName "\<\I\i*\>" contained nextgroup=pcctsClassBlock skipwhite skipnl
syn region pcctsClassBlock start="{" end="}" contained contains=pcctsRule,pcctsComment,pcctsDirective,pcctsAction,pcctsException,pcctsExceptionHandler

syn keyword pcctsException exception nextgroup=pcctsExceptionRuleRef skipwhite
syn match pcctsExceptionRuleRef "\[\I\i*\]" contained contains=pcctsExceptionID
syn match pcctsExceptionID "\I\i*" contained
syn keyword pcctsExceptionHandler	catch default
syn keyword pcctsExceptionHandler	NoViableAlt NoSemViableAlt
syn keyword pcctsExceptionHandler	MismatchedToken

syn sync clear
syn sync match pcctsSyncAction grouphere pcctsAction "<<"
syn sync match pcctsSyncAction "<<\([^>]\|>[^>]\)*>>"
syn sync match pcctsSyncRule grouphere pcctsRule "\<[a-z][A-Za-z0-9_]*\>\s*\[[^]]*\]\s*:"
syn sync match pcctsSyncRule grouphere pcctsRule "\<[a-z][A-Za-z0-9_]*\>\(\s*\[[^]]*\]\)\=\s*>\s*\[[^]]*\]\s*:"

" Define the default highlighting.
" Only when an item doesn't have highlighting yet

hi def link pcctsDelim		Special
hi def link pcctsTokenName		Identifier
hi def link pcctsRuleName		Statement
hi def link pcctsLabelHack		Label
hi def link pcctsDirective		PreProc
hi def link pcctsString		String
hi def link pcctsComment		Comment
hi def link pcctsClass		Statement
hi def link pcctsClassName		Identifier
hi def link pcctsException		Statement
hi def link pcctsExceptionHandler	Keyword
hi def link pcctsExceptionRuleRef	pcctsDelim
hi def link pcctsExceptionID	Identifier
hi def link pcctsRuleRef		Identifier
hi def link pcctsSpecialChar	SpecialChar


let b:current_syntax = "pccts"

" vim: ts=8