Add syntax files from upstream vim repository

syntax/grads.vim

@@ -0,0 +1,77 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'vim') == -1
+  
+" 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
+
+hi def link gradsStatement		Statement
+
+hi def link gradsString		String
+hi def link gradsNumber		Number
+
+hi def link gradsFixVariables	Special
+hi def link gradsVariables		Identifier
+hi def link gradsglobalVariables	Special
+hi def link gradsConst		Special
+
+hi def link gradsClassMethods	Function
+
+hi def link gradsOperator		Operator
+hi def link gradsComment		Comment
+
+hi def link gradsTypos		Error
+
+
+let b:current_syntax = "grads"
+
+endif