" 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.

" For version 5.x: Clear all syntax items
" For version 6.x: Quit when a syntax file was already loaded
if version < 600
syntax clear
elseif 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.
" For version 5.7 and earlier: only when not done already
" For version 5.8 and later: only when an item doesn't hgs highlighting+yet
if version >= 508 || !exists("did_gs_syn_inits")
if version < 508
let did_gs_syn_inits = 1
command -nargs=+ HiLink hi link <args>
else
command -nargs=+ HiLink hi def link <args>
endif

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
endif

let b:current_syntax = "grads"