Add rego support, closes #406

syntax/rego.vim

@@ -0,0 +1,61 @@
+if exists('g:polyglot_disabled') && index(g:polyglot_disabled, 'rego') != -1
+  finish
+endif
+
+" Vim syntax file
+" Language: Rego (http://github.com/open-policy-agent/opa)
+" Maintainers: Torin Sandall <torinsandall@gmail.com>
+
+if version < 600
+    syntax clear
+elseif exists("b:current_syntax")
+    finish
+endif
+
+syn case match
+
+" language keywords
+syn keyword regoKeyword package import as not with default else some
+
+" comments
+syn match regoComment "#.*$" contains=regoTodo,@Spell
+syn keyword regoTodo FIXME XXX TODO contained
+
+" data types
+syn keyword regoNull null
+syn keyword regoBoolean true false
+syn match regoNumber "\<\(0[0-7]*\|0[xx]\x\+\|\d\+\)[ll]\=\>"
+syn match regoNumber "\(\<\d\+\.\d*\|\.\d\+\)\([ee][-+]\=\d\+\)\=[ffdd]\="
+syn match regoNumber "\<\d\+[ee][-+]\=\d\+[ffdd]\=\>"
+syn match regoNumber "\<\d\+\([ee][-+]\=\d\+\)\=[ffdd]\>"
+syn region regoString start="\"[^"]" skip="\\\"" end="\"" contains=regoStringEscape
+syn match regoStringEscape "\\u[0-9a-fA-F]\{4}" contained
+syn match regoStringEscape "\\[nrfvb\\\"]" contained
+
+" rules
+syn match regoRuleName "^\(\w\+\)"
+syn region regoBody start="{" end="}" transparent
+
+" operators
+syn match regoEquality "="
+syn match regoInequality "[<>!]"
+syn match regoArith "[+-/*&|]"
+syn match regoBuiltin "\w\+(" nextgroup=regoBuiltinArgs contains=regoBuiltinArgs
+syn region regoBuiltinArgs start="(" end=")" contained contains=regoNull,regoBoolean,regoNumber,regoString
+
+" highlighting
+hi link regoKeyword Keyword
+hi link regoNull Function
+hi link regoBoolean Boolean
+hi link regoNumber Number
+hi link regoString String
+
+hi link regoRuleName Function
+
+hi link regoEquality Keyword
+hi link regoInequality Keyword
+hi link regoArith Keyword
+hi link regoBuiltin Type
+
+hi link regoComment Comment
+hi link regoTodo Todo