Add flatbuffers support, closes #368

syntax/fbs.vim

@@ -0,0 +1,56 @@
+if exists('g:polyglot_disabled') && index(g:polyglot_disabled, 'flatbuffers') != -1
+  finish
+endif
+
+if exists("b:current_syntax")
+  finish
+endif
+
+syn case match
+
+syn keyword fbTodo contained TODO FIXME XXX
+syn cluster fbCommentGrp contains=fbTodo
+
+syn keyword fbSyntax include namespace attribute root_type
+syn keyword fbTypeDef enum
+syn keyword fbTypeDecl union struct table
+syn keyword fbFieldType bool byte int8 ubyte uint8
+syn keyword fbFieldType short int16 ushort uint16
+syn keyword fbFieldType int int32 uint uint32
+syn keyword fbFieldType long int64 ulong uint64
+syn keyword fbFieldType float float32 double float64
+syn keyword fbFieldType string
+syn keyword fbBool true false
+
+syn region fbComment start="//" skip="\\$" end="$" keepend contains=@fbCommentGrp
+
+syn match fbInt /-\?\<\d\+\>/
+syn match fbInt /\<0[xX]\x+\>/
+syn match fbFloat /\<-\?\d*\(\.\d*\)\?/
+
+syn region fbString start=/"/ skip=/\\./ end=/"/
+
+if version >= 508 || !exists("did_proto_syn_inits")
+  if version < 508
+    let did_proto_syn_inits = 1
+    command -nargs=+ HiLink hi link <args>
+  else
+    command -nargs=+ HiLink hi def link <args>
+  endif
+
+  HiLink fbTodo Todo
+  HiLink fbSyntax Include
+  HiLink fbTypeDecl Structure
+  HiLink fbFieldType Type
+  HiLink fbTypeDef Typedef
+  HiLink fbBool Boolean
+
+  HiLink fbInt Number
+  HiLink fbFloat Float
+  HiLink fbComment Comment
+  HiLink fbString String
+
+  delcommand HiLink
+endif
+
+let b:current_syntax = "fbs"