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+" Protocol Buffers - Google's data interchange format
+" Copyright 2008 Google Inc. All rights reserved.
+" https://developers.google.com/protocol-buffers/
+"
+" Redistribution and use in source and binary forms, with or without
+" modification, are permitted provided that the following conditions are
+" met:
+"
+" * Redistributions of source code must retain the above copyright
+" notice, this list of conditions and the following disclaimer.
+" * Redistributions in binary form must reproduce the above
+" copyright notice, this list of conditions and the following disclaimer
+" in the documentation and/or other materials provided with the
+" distribution.
+" * Neither the name of Google Inc. nor the names of its
+" contributors may be used to endorse or promote products derived from
+" this software without specific prior written permission.
+"
+" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+" "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+" LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+" A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+" OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+" LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+" OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+" This is the Vim syntax file for Google Protocol Buffers as found at
+" https://github.com/protocolbuffers/protobuf
+" Last update: 2020 Oct 29
+
+" quit when a syntax file was already loaded
+if exists("b:current_syntax")
+ finish
+endif
+
+syn case match
+
+syn keyword protoTodo contained TODO FIXME XXX
+syn cluster protoCommentGrp contains=protoTodo
+
+syn keyword protoSyntax syntax import option
+syn keyword protoStructure package message group oneof
+syn keyword protoRepeat optional required repeated
+syn keyword protoDefault default
+syn keyword protoExtend extend extensions to max reserved
+syn keyword protoRPC service rpc returns
+
+syn keyword protoType int32 int64 uint32 uint64 sint32 sint64
+syn keyword protoType fixed32 fixed64 sfixed32 sfixed64
+syn keyword protoType float double bool string bytes
+syn keyword protoTypedef enum
+syn keyword protoBool true false
+
+syn match protoInt /-\?\<\d\+\>/
+syn match protoInt /\<0[xX]\x+\>/
+syn match protoFloat /\<-\?\d*\(\.\d*\)\?/
+syn region protoComment start="\/\*" end="\*\/" contains=@pbCommentGrp,@Spell
+syn region protoComment start="//" skip="\\$" end="$" keepend contains=@pbCommentGrp,@Spell
+syn region protoString start=/"/ skip=/\\./ end=/"/ contains=@Spell
+syn region protoString start=/'/ skip=/\\./ end=/'/ contains=@Spell
+
+hi def link protoTodo Todo
+
+hi def link protoSyntax Include
+hi def link protoStructure Structure
+hi def link protoRepeat Repeat
+hi def link protoDefault Keyword
+hi def link protoExtend Keyword
+hi def link protoRPC Keyword
+hi def link protoType Type
+hi def link protoTypedef Typedef
+hi def link protoBool Boolean
+
+hi def link protoInt Number
+hi def link protoFloat Float
+hi def link protoComment Comment
+hi def link protoString String
+
+let b:current_syntax = "proto"