" Vim syntax file
" Language:	grads (GrADS scripts)
" Maintainer:	Stefan Fronzek (sfronzek at gmx dot net)
" Last change: 13 Feb 2004

" Grid Analysis and Display System (GrADS); http://grads.iges.org/grads
" This syntax file defines highlighting for only very few features of
" the GrADS scripting language.

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

" GrADS is entirely case-insensitive.
syn case ignore

" The keywords

syn keyword gradsStatement	if else endif break exit return
syn keyword gradsStatement	while endwhile say prompt pull function
syn keyword gradsStatement subwrd sublin substr read write close
" String

syn region gradsString		start=+'+ end=+'+

" Integer number
syn match  gradsNumber		"[+-]\=\<[0-9]\+\>"

" Operator

"syn keyword gradsOperator	| ! % & != >=
"syn match gradsOperator		"[^\.]not[^a-zA-Z]"

" Variables

syn keyword gradsFixVariables	lat lon lev result rec rc
syn match gradsglobalVariables	"_[a-zA-Z][a-zA-Z0-9]*"
syn match gradsVariables		"[a-zA-Z][a-zA-Z0-9]*"
syn match gradsConst		"#[A-Z][A-Z_]+"

" Comments

syn match gradsComment	"\*.*"

" Typical Typos

" for C programmers:
" syn match gradsTypos	"=="
" syn match gradsTypos	"!="

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

HiLink gradsStatement		Statement

HiLink gradsString		String
HiLink gradsNumber		Number

HiLink gradsFixVariables	Special
HiLink gradsVariables		Identifier
HiLink gradsglobalVariables	Special
HiLink gradsConst		Special

HiLink gradsClassMethods	Function

HiLink gradsOperator		Operator
HiLink gradsComment		Comment

HiLink gradsTypos		Error

delcommand HiLink

let b:current_syntax = "grads"