" Vim syntax file
" Language:	Renderman shader language
" Maintainer:	Dan Piponi <dan@tanelorn.demon.co.uk>
" Last Change:	2001 May 09

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

" A bunch of useful Renderman keywords including special
" RenderMan control structures
syn keyword slStatement	break return continue
syn keyword slConditional	if else
syn keyword slRepeat		while for
syn keyword slRepeat		illuminance illuminate solar

syn keyword slTodo contained	TODO FIXME XXX

" String and Character constants
" Highlight special characters (those which have a backslash) differently
syn match slSpecial contained	"\\[0-9][0-9][0-9]\|\\."
syn region slString		start=+"+ skip=+\\\\\|\\"+ end=+"+ contains=slSpecial
syn match slCharacter		"'[^\\]'"
syn match slSpecialCharacter	"'\\.'"
syn match slSpecialCharacter	"'\\[0-9][0-9]'"
syn match slSpecialCharacter	"'\\[0-9][0-9][0-9]'"

"catch errors caused by wrong parenthesis
syn region slParen		transparent start='(' end=')' contains=ALLBUT,slParenError,slIncluded,slSpecial,slTodo,slUserLabel
syn match slParenError		")"
syn match slInParen contained	"[{}]"

"integer number, or floating point number without a dot and with "f".
syn case ignore
syn match slNumber		"\<[0-9]\+\(u\=l\=\|lu\|f\)\>"
"floating point number, with dot, optional exponent
syn match slFloat		"\<[0-9]\+\.[0-9]*\(e[-+]\=[0-9]\+\)\=[fl]\=\>"
"floating point number, starting with a dot, optional exponent
syn match slFloat		"\.[0-9]\+\(e[-+]\=[0-9]\+\)\=[fl]\=\>"
"floating point number, without dot, with exponent
syn match slFloat		"\<[0-9]\+e[-+]\=[0-9]\+[fl]\=\>"
"hex number
syn match slNumber		"\<0x[0-9a-f]\+\(u\=l\=\|lu\)\>"
"syn match slIdentifier	"\<[a-z_][a-z0-9_]*\>"
syn case match

if exists("sl_comment_strings")
  " A comment can contain slString, slCharacter and slNumber.
  " But a "*/" inside a slString in a slComment DOES end the comment!  So we
  " need to use a special type of slString: slCommentString, which also ends on
  " "*/", and sees a "*" at the start of the line as comment again.
  " Unfortunately this doesn't very well work for // type of comments :-(
  syntax match slCommentSkip	contained "^\s*\*\($\|\s\+\)"
  syntax region slCommentString	contained start=+"+ skip=+\\\\\|\\"+ end=+"+ end=+\*/+me=s-1 contains=slSpecial,slCommentSkip
  syntax region slComment2String	contained start=+"+ skip=+\\\\\|\\"+ end=+"+ end="$" contains=slSpecial
  syntax region slComment	start="/\*" end="\*/" contains=slTodo,slCommentString,slCharacter,slNumber
else
  syn region slComment		start="/\*" end="\*/" contains=slTodo
endif
syntax match slCommentError	"\*/"

syn keyword slOperator	sizeof
syn keyword slType		float point color string vector normal matrix void
syn keyword slStorageClass	varying uniform extern
syn keyword slStorageClass	light surface volume displacement transformation imager
syn keyword slVariable	Cs Os P dPdu dPdv N Ng u v du dv s t
syn keyword slVariable L Cl Ol E I ncomps time Ci Oi
syn keyword slVariable Ps alpha
syn keyword slVariable dtime dPdtime

syn sync ccomment slComment minlines=10

" Define the default highlighting.
" Only when an item doesn't have highlighting yet
command -nargs=+ HiLink hi def link <args>

HiLink slLabel	Label
HiLink slUserLabel	Label
HiLink slConditional	Conditional
HiLink slRepeat	Repeat
HiLink slCharacter	Character
HiLink slSpecialCharacter slSpecial
HiLink slNumber	Number
HiLink slFloat	Float
HiLink slParenError	slError
HiLink slInParen	slError
HiLink slCommentError	slError
HiLink slOperator	Operator
HiLink slStorageClass	StorageClass
HiLink slError	Error
HiLink slStatement	Statement
HiLink slType		Type
HiLink slCommentError	slError
HiLink slCommentString slString
HiLink slComment2String slString
HiLink slCommentSkip	slComment
HiLink slString	String
HiLink slComment	Comment
HiLink slSpecial	SpecialChar
HiLink slTodo	Todo
HiLink slVariable	Identifier
"HiLink slIdentifier	Identifier

delcommand HiLink

let b:current_syntax = "sl"

" vim: ts=8