parser

package
v4.14.2 Latest Latest
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 Go to latest Published: May 18, 2025 License: MIT Imports: 7 Imported by: 51

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This section is empty.

Types

type Comment 

type Comment struct {
	// Raw includes a comment syntax like // and /* */.
	Raw string
	// Meta is the meta information.
	Meta meta.Meta
}

Comment is a comment in either C/C++-style // and /* ... */ syntax.

func (*Comment) Accept 

func (c *Comment) Accept(v Visitor)

Accept dispatches the call to the visitor.

func (*Comment) IsCStyle 

func (c *Comment) IsCStyle() bool

IsCStyle refers to /* ... */.

func (*Comment) Lines 

func (c *Comment) Lines() []string

Lines formats comment text lines without prefixes //, /* or suffix */.

type ConfigOption 

type ConfigOption func(*Parser)

ConfigOption is an option for Parser.

func WithBodyIncludingComments 

func WithBodyIncludingComments(bodyIncludingComments bool) ConfigOption

WithBodyIncludingComments is an option to allow to include comments into each element's body. The comments are remaining of other elements'Comments and InlineComment.

func WithPermissive 

func WithPermissive(permissive bool) ConfigOption

WithPermissive is an option to allow the permissive parsing rather than the just documented spec.

type Declaration added in v4.14.0 

type Declaration struct {
	Number   string
	FullName string
	Type     string
	Reserved bool
	Repeated bool

	// Comments are the optional ones placed at the beginning.
	Comments []*Comment
	// InlineComment is the optional one placed at the ending.
	InlineComment *Comment
	// InlineCommentBehindLeftCurly is the optional one placed behind a left curly.
	InlineCommentBehindLeftCurly *Comment
	// Meta is the meta information.
	Meta meta.Meta
}

Declaration is an option of extension ranges.

func (*Declaration) Accept added in v4.14.0 

func (d *Declaration) Accept(v Visitor)

Accept dispatches the call to the visitor.

func (*Declaration) SetInlineComment added in v4.14.0 

func (d *Declaration) SetInlineComment(comment *Comment)

SetInlineComment implements the HasInlineCommentSetter interface.

type Edition added in v4.12.0 

type Edition struct {
	Edition string

	// EditionQuote includes quotes
	EditionQuote string

	// Comments are the optional ones placed at the beginning.
	Comments []*Comment
	// InlineComment is the optional one placed at the ending.
	InlineComment *Comment
	// Meta is the meta information.
	Meta meta.Meta
}

Edition is used to define the protobuf version.

func (*Edition) Accept added in v4.12.0 

func (s *Edition) Accept(v Visitor)

Accept dispatches the call to the visitor.

func (*Edition) SetInlineComment added in v4.12.0 

func (s *Edition) SetInlineComment(comment *Comment)

SetInlineComment implements the HasInlineCommentSetter interface.

type EmptyStatement 

type EmptyStatement struct {
	// InlineComment is the optional one placed at the ending.
	InlineComment *Comment
}

EmptyStatement represents ";".

func (*EmptyStatement) Accept 

func (e *EmptyStatement) Accept(v Visitor)

Accept dispatches the call to the visitor.

func (*EmptyStatement) SetInlineComment 

func (e *EmptyStatement) SetInlineComment(comment *Comment)

SetInlineComment implements the HasInlineCommentSetter interface.

type Enum 

type Enum struct {
	EnumName string
	// EnumBody can have options and enum fields.
	// The element of this is the union of an option, enumField, reserved, and emptyStatement.
	EnumBody []Visitee

	// Comments are the optional ones placed at the beginning.
	Comments []*Comment
	// InlineComment is the optional one placed at the ending.
	InlineComment *Comment
	// InlineCommentBehindLeftCurly is the optional one placed behind a left curly.
	InlineCommentBehindLeftCurly *Comment
	// Meta is the meta information.
	Meta meta.Meta
}

Enum consists of a name and an enum body.

func (*Enum) Accept 

func (e *Enum) Accept(v Visitor)

Accept dispatches the call to the visitor.

func (*Enum) SetInlineComment 

func (e *Enum) SetInlineComment(comment *Comment)

SetInlineComment implements the HasInlineCommentSetter interface.

type EnumField 

type EnumField struct {
	Ident            string
	Number           string
	EnumValueOptions []*EnumValueOption

	// Comments are the optional ones placed at the beginning.
	Comments []*Comment
	// InlineComment is the optional one placed at the ending.
	InlineComment *Comment
	// Meta is the meta information.
	Meta meta.Meta
}

EnumField is a field of enum.

func (*EnumField) Accept 

func (f *EnumField) Accept(v Visitor)

Accept dispatches the call to the visitor.

func (*EnumField) SetInlineComment 

func (f *EnumField) SetInlineComment(comment *Comment)

SetInlineComment implements the HasInlineCommentSetter interface.

type EnumValueOption 

type EnumValueOption struct {
	OptionName string
	Constant   string
}

EnumValueOption is an option of a enumField.

type Extend 

type Extend struct {
	MessageType string
	// ExtendBody can have fields and emptyStatements
	ExtendBody []Visitee

	// Comments are the optional ones placed at the beginning.
	Comments []*Comment
	// InlineComment is the optional one placed at the ending.
	InlineComment *Comment
	// InlineCommentBehindLeftCurly is the optional one placed behind a left curly.
	InlineCommentBehindLeftCurly *Comment
	// Meta is the meta information.
	Meta meta.Meta
}

Extend consists of a messageType and an extend body.

func (*Extend) Accept 

func (m *Extend) Accept(v Visitor)

Accept dispatches the call to the visitor.

func (*Extend) SetInlineComment 

func (m *Extend) SetInlineComment(comment *Comment)

SetInlineComment implements the HasInlineCommentSetter interface.

type Extensions 

type Extensions struct {
	Ranges       []*Range
	Declarations []*Declaration

	// Comments are the optional ones placed at the beginning.
	Comments []*Comment
	// InlineComment is the optional one placed at the ending.
	InlineComment *Comment
	// InlineCommentBehindLeftSquare is the optional one placed behind a left square.
	InlineCommentBehindLeftSquare *Comment
	// Meta is the meta information.
	Meta meta.Meta
}

Extensions declare that a range of field numbers in a message are available for third-party extensions.

func (*Extensions) Accept 

func (e *Extensions) Accept(v Visitor)

Accept dispatches the call to the visitor.

func (*Extensions) SetInlineComment 

func (e *Extensions) SetInlineComment(comment *Comment)

SetInlineComment implements the HasInlineCommentSetter interface.

type Field 

type Field struct {
	IsRepeated   bool
	IsRequired   bool // proto2 only
	IsOptional   bool // proto2 only
	Type         string
	FieldName    string
	FieldNumber  string
	FieldOptions []*FieldOption

	// Comments are the optional ones placed at the beginning.
	Comments []*Comment
	// InlineComment is the optional one placed at the ending.
	InlineComment *Comment
	// Meta is the meta information.
	Meta meta.Meta
}

Field is a normal field that is the basic element of a protocol buffer message.

func (*Field) Accept 

func (f *Field) Accept(v Visitor)

Accept dispatches the call to the visitor.

func (*Field) SetInlineComment 

func (f *Field) SetInlineComment(comment *Comment)

SetInlineComment implements the HasInlineCommentSetter interface.

type FieldOption 

type FieldOption struct {
	OptionName string
	Constant   string
}

FieldOption is an option for the field.

type GroupField 

type GroupField struct {
	IsRepeated bool
	IsRequired bool
	IsOptional bool
	// GroupName must begin with capital letter.
	GroupName string
	// MessageBody can have fields, nested enum definitions, nested message definitions,
	// options, oneofs, map fields, extends, reserved, and extensions statements.
	MessageBody []Visitee
	FieldNumber string

	// Comments are the optional ones placed at the beginning.
	Comments []*Comment
	// InlineComment is the optional one placed at the ending.
	InlineComment *Comment
	// InlineCommentBehindLeftCurly is the optional one placed behind a left curly.
	InlineCommentBehindLeftCurly *Comment
	// Meta is the meta information.
	Meta meta.Meta
}

GroupField is one way to nest information in message definitions. proto2 only.

func (*GroupField) Accept 

func (f *GroupField) Accept(v Visitor)

Accept dispatches the call to the visitor.

func (*GroupField) SetInlineComment 

func (f *GroupField) SetInlineComment(comment *Comment)

SetInlineComment implements the HasInlineCommentSetter interface.

type HasInlineCommentSetter 

type HasInlineCommentSetter interface {
	SetInlineComment(comment *Comment)
}

HasInlineCommentSetter requires to have a setter for an InlineComment field.

type Import 

type Import struct {
	Modifier ImportModifier
	Location string

	// Comments are the optional ones placed at the beginning.
	Comments []*Comment
	// InlineComment is the optional one placed at the ending.
	InlineComment *Comment
	// Meta is the meta information.
	Meta meta.Meta
}

Import is used to import another .proto's definitions.

func (*Import) Accept 

func (i *Import) Accept(v Visitor)

Accept dispatches the call to the visitor.

func (*Import) SetInlineComment 

func (i *Import) SetInlineComment(comment *Comment)

SetInlineComment implements the HasInlineCommentSetter interface.

type ImportModifier 

type ImportModifier uint

ImportModifier is a modifier enum type for import behavior. 

const (
	ImportModifierNone ImportModifier = iota
	ImportModifierPublic
	ImportModifierWeak
)

Optional import modifier value to change a default behavior.

type MapField 

type MapField struct {
	KeyType      string
	Type         string
	MapName      string
	FieldNumber  string
	FieldOptions []*FieldOption

	// Comments are the optional ones placed at the beginning.
	Comments []*Comment
	// InlineComment is the optional one placed at the ending.
	InlineComment *Comment
	// Meta is the meta information.
	Meta meta.Meta
}

MapField is an associative map.

func (*MapField) Accept 

func (m *MapField) Accept(v Visitor)

Accept dispatches the call to the visitor.

func (*MapField) SetInlineComment 

func (m *MapField) SetInlineComment(comment *Comment)

SetInlineComment implements the HasInlineCommentSetter interface.

type Message 

type Message struct {
	MessageName string
	// MessageBody can have fields, nested enum definitions, nested message definitions,
	// options, oneofs, map fields, group fields(proto2 only), extends, reserved, and extensions(proto2 only) statements.
	MessageBody []Visitee

	// Comments are the optional ones placed at the beginning.
	Comments []*Comment
	// InlineComment is the optional one placed at the ending.
	InlineComment *Comment
	// InlineCommentBehindLeftCurly is the optional one placed behind a left curly.
	InlineCommentBehindLeftCurly *Comment
	// Meta is the meta information.
	Meta meta.Meta
}

Message consists of a message name and a message body.

func (*Message) Accept 

func (m *Message) Accept(v Visitor)

Accept dispatches the call to the visitor.

func (*Message) SetInlineComment 

func (m *Message) SetInlineComment(comment *Comment)

SetInlineComment implements the HasInlineCommentSetter interface.

type Oneof 

type Oneof struct {
	OneofFields []*OneofField
	OneofName   string

	Options []*Option

	// Comments are the optional ones placed at the beginning.
	Comments []*Comment
	// InlineComment is the optional one placed at the ending.
	InlineComment *Comment
	// InlineCommentBehindLeftCurly is the optional one placed behind a left curly.
	InlineCommentBehindLeftCurly *Comment
	// Meta is the meta information.
	Meta meta.Meta
}

Oneof consists of oneof fields and a oneof name.

func (*Oneof) Accept 

func (o *Oneof) Accept(v Visitor)

Accept dispatches the call to the visitor.

func (*Oneof) SetInlineComment 

func (o *Oneof) SetInlineComment(comment *Comment)

SetInlineComment implements the HasInlineCommentSetter interface.

type OneofField 

type OneofField struct {
	Type         string
	FieldName    string
	FieldNumber  string
	FieldOptions []*FieldOption

	// Comments are the optional ones placed at the beginning.
	Comments []*Comment
	// InlineComment is the optional one placed at the ending.
	InlineComment *Comment
	// Meta is the meta information.
	Meta meta.Meta
}

OneofField is a constituent field of oneof.

func (*OneofField) Accept 

func (f *OneofField) Accept(v Visitor)

Accept dispatches the call to the visitor.

func (*OneofField) SetInlineComment 

func (f *OneofField) SetInlineComment(comment *Comment)

SetInlineComment implements the HasInlineCommentSetter interface.

type Option 

type Option struct {
	OptionName string
	Constant   string

	// Comments are the optional ones placed at the beginning.
	Comments []*Comment
	// InlineComment is the optional one placed at the ending.
	InlineComment *Comment
	// Meta is the meta information.
	Meta meta.Meta
}

Option can be used in proto files, messages, enums and services.

func (*Option) Accept 

func (o *Option) Accept(v Visitor)

Accept dispatches the call to the visitor.

func (*Option) SetInlineComment 

func (o *Option) SetInlineComment(comment *Comment)

SetInlineComment implements the HasInlineCommentSetter interface.

type Package 

type Package struct {
	Name string

	// Comments are the optional ones placed at the beginning.
	Comments []*Comment
	// InlineComment is the optional one placed at the ending.
	InlineComment *Comment
	// Meta is the meta information.
	Meta meta.Meta
}

Package can be used to prevent name clashes between protocol message types.

func (*Package) Accept 

func (p *Package) Accept(v Visitor)

Accept dispatches the call to the visitor.

func (*Package) SetInlineComment 

func (p *Package) SetInlineComment(comment *Comment)

SetInlineComment implements the HasInlineCommentSetter interface.

type Parser 

type Parser struct {
	// contains filtered or unexported fields
}

Parser is a parser.

func NewParser 

func NewParser(lex *lexer.Lexer, opts ...ConfigOption) *Parser

NewParser creates a new Parser.

func (*Parser) IsEOF 

func (p *Parser) IsEOF() bool

IsEOF checks whether the lex's read buffer is empty.

func (*Parser) MaybeScanInlineComment 

func (p *Parser) MaybeScanInlineComment(
	hasSetter HasInlineCommentSetter,
)

MaybeScanInlineComment tries to scan a comment on the current line. If present then set it with setter.

func (*Parser) ParseComments 

func (p *Parser) ParseComments() []*Comment

ParseComments parsers a sequence of comments. 

comments = { comment }

See https://developers.google.com/protocol-buffers/docs/proto3#adding-comments

func (*Parser) ParseDeclaration added in v4.14.0 

func (p *Parser) ParseDeclaration() (*Declaration, error)

ParseDeclaration parses a declaration. 

declaration = "declaration" "=" "{"
  "number" ":" number ","
  "full_name" ":" string ","
  "type" ":" string ","
  "repeated" ":" bool ","
  "reserved" ":" bool
"}"

See https://protobuf.dev/programming-guides/extension_declarations/

func (*Parser) ParseEdition added in v4.12.0 

func (p *Parser) ParseEdition() (*Edition, error)

ParseEdition parses the Edition.

edition = "edition" "=" [ ( "'" decimalLit "'" ) | ( '"' decimalLit '"' ) ] ";"

See https://protobuf.dev/reference/protobuf/edition-2023-spec/#edition

func (*Parser) ParseEnum 

func (p *Parser) ParseEnum() (*Enum, error)

ParseEnum parses the enum. 

enum = "enum" enumName enumBody

See https://developers.google.com/protocol-buffers/docs/reference/proto3-spec#enum_definition

func (*Parser) ParseExtend 

func (p *Parser) ParseExtend() (*Extend, error)

ParseExtend parses the extend. Note that group is not supported. 

extend = "extend" messageType "{" {field | group | emptyStatement} "}"

See https://developers.google.com/protocol-buffers/docs/reference/proto2-spec#extend

func (*Parser) ParseExtensions 

func (p *Parser) ParseExtensions() (*Extensions, error)

ParseExtensions parses the extensions. 

extensions = "extensions" ranges ";"

See https://developers.google.com/protocol-buffers/docs/reference/proto2-spec#extensions

func (*Parser) ParseField 

func (p *Parser) ParseField() (*Field, error)

ParseField parses the field. 

field = [ "repeated" ] type fieldName "=" fieldNumber [ "[" fieldOptions "]" ] ";"
field = [ "required" | "optional" | "repeated" ] type fieldName "=" fieldNumber [ "[" fieldOptions "]" ] ";"

See 

https://developers.google.com/protocol-buffers/docs/reference/proto3-spec#normal_field
https://developers.google.com/protocol-buffers/docs/reference/proto2-spec#normal_field

func (*Parser) ParseGroupField 

func (p *Parser) ParseGroupField() (*GroupField, error)

ParseGroupField parses the group. 

group = label "group" groupName "=" fieldNumber messageBody

See https://developers.google.com/protocol-buffers/docs/reference/proto2-spec#group_field

func (*Parser) ParseImport 

func (p *Parser) ParseImport() (*Import, error)

ParseImport parses the import. 

import = "import" [ "weak" | "public" ] strLit ";"

See https://developers.google.com/protocol-buffers/docs/reference/proto3-spec#import_statement

func (*Parser) ParseMapField 

func (p *Parser) ParseMapField() (*MapField, error)

ParseMapField parses the mapField. 

mapField = "map" "<" keyType "," type ">" mapName "=" fieldNumber [ "[" fieldOptions "]" ] ";"

See https://developers.google.com/protocol-buffers/docs/reference/proto3-spec#map_field

func (*Parser) ParseMessage 

func (p *Parser) ParseMessage() (*Message, error)

ParseMessage parses the message. 

message = "message" messageName messageBody

See https://developers.google.com/protocol-buffers/docs/reference/proto3-spec#message_definition

func (*Parser) ParseOneof 

func (p *Parser) ParseOneof() (*Oneof, error)

ParseOneof parses the oneof. 

oneof = "oneof" oneofName "{" { option | oneofField | emptyStatement } "}"

See https://developers.google.com/protocol-buffers/docs/reference/proto3-spec#oneof_and_oneof_field

func (*Parser) ParseOption 

func (p *Parser) ParseOption() (*Option, error)

ParseOption parses the option. 

option = "option" optionName  "=" constant ";"

See https://developers.google.com/protocol-buffers/docs/reference/proto3-spec#option

func (*Parser) ParsePackage 

func (p *Parser) ParsePackage() (*Package, error)

ParsePackage parses the package. 

package = "package" fullIdent ";"

See https://developers.google.com/protocol-buffers/docs/reference/proto3-spec#package

func (*Parser) ParseProto 

func (p *Parser) ParseProto() (*Proto, error)

ParseProto parses the proto. 

proto = [syntax] [edition] { import | package | option | topLevelDef | emptyStatement }

See https://developers.google.com/protocol-buffers/docs/reference/proto3-spec#proto_file See https://protobuf.dev/reference/protobuf/edition-2023-spec/#proto_file

func (*Parser) ParseReserved 

func (p *Parser) ParseReserved() (*Reserved, error)

ParseReserved parses the reserved. 

reserved = "reserved" ( ranges | fieldNames ) ";"
reserved = "reserved" ( ranges | reservedIdent ) ";"

See https://developers.google.com/protocol-buffers/docs/reference/proto3-spec#reserved See https://protobuf.dev/reference/protobuf/edition-2023-spec/#reserved

func (*Parser) ParseService 

func (p *Parser) ParseService() (*Service, error)

ParseService parses the service. 

service = "service" serviceName "{" { option | rpc | emptyStatement } "}"

See https://developers.google.com/protocol-buffers/docs/reference/proto3-spec#service_definition

func (*Parser) ParseSyntax 

func (p *Parser) ParseSyntax() (*Syntax, error)

ParseSyntax parses the syntax. 

syntax = "syntax" "=" quote "proto3" quote ";"
syntax = "syntax" "=" quote "proto2" quote ";"

See https://developers.google.com/protocol-buffers/docs/reference/proto3-spec#syntax

type Proto 

type Proto struct {
	Syntax  *Syntax
	Edition *Edition
	// ProtoBody is a slice of sum type consisted of *Import, *Package, *Option, *Message, *Enum, *Service, *Extend and *EmptyStatement.
	ProtoBody []Visitee
	Meta      *ProtoMeta
}

Proto represents a protocol buffer definition.

func (*Proto) Accept 

func (p *Proto) Accept(v Visitor)

Accept dispatches the call to the visitor.

type ProtoMeta 

type ProtoMeta struct {
	// Filename is a name of file, if any.
	Filename string
}

ProtoMeta represents a meta information about the Proto.

type RPC 

type RPC struct {
	RPCName     string
	RPCRequest  *RPCRequest
	RPCResponse *RPCResponse
	Options     []*Option

	// Comments are the optional ones placed at the beginning.
	Comments []*Comment
	// InlineComment is the optional one placed at the ending.
	InlineComment *Comment
	// InlineCommentBehindLeftCurly is the optional one placed behind a left curly.
	InlineCommentBehindLeftCurly *Comment
	// EmbeddedComments are the optional ones placed between the start position and the position before left curly.
	EmbeddedComments []*Comment
	// Meta is the meta information.
	Meta meta.Meta
}

RPC is a Remote Procedure Call.

func (*RPC) Accept 

func (r *RPC) Accept(v Visitor)

Accept dispatches the call to the visitor.

func (*RPC) SetInlineComment 

func (r *RPC) SetInlineComment(comment *Comment)

SetInlineComment implements the HasInlineCommentSetter interface.

type RPCRequest 

type RPCRequest struct {
	IsStream    bool
	MessageType string

	// Meta is the meta information.
	Meta meta.Meta
}

RPCRequest is a request of RPC.

type RPCResponse 

type RPCResponse struct {
	IsStream    bool
	MessageType string

	// Meta is the meta information.
	Meta meta.Meta
}

RPCResponse is a response of RPC.

type Range 

type Range struct {
	Begin string
	End   string
}

Range is a range of field numbers. End is an optional value.

type Reserved 

type Reserved struct {
	Ranges     []*Range
	FieldNames []string

	// Comments are the optional ones placed at the beginning.
	Comments []*Comment
	// InlineComment is the optional one placed at the ending.
	InlineComment *Comment
	// Meta is the meta information.
	Meta meta.Meta
}

Reserved declares a range of field numbers or field names that cannot be used in this message. These component Ranges and FieldNames are mutually exclusive.

func (*Reserved) Accept 

func (r *Reserved) Accept(v Visitor)

Accept dispatches the call to the visitor.

func (*Reserved) SetInlineComment 

func (r *Reserved) SetInlineComment(comment *Comment)

SetInlineComment implements the HasInlineCommentSetter interface.

type Service 

type Service struct {
	ServiceName string
	// ServiceBody can have options and rpcs.
	ServiceBody []Visitee

	// Comments are the optional ones placed at the beginning.
	Comments []*Comment
	// InlineComment is the optional one placed at the ending.
	InlineComment *Comment
	// InlineCommentBehindLeftCurly is the optional one placed behind a left curly.
	InlineCommentBehindLeftCurly *Comment
	// Meta is the meta information.
	Meta meta.Meta
}

Service consists of RPCs.

func (*Service) Accept 

func (s *Service) Accept(v Visitor)

Accept dispatches the call to the visitor.

func (*Service) SetInlineComment 

func (s *Service) SetInlineComment(comment *Comment)

SetInlineComment implements the HasInlineCommentSetter interface.

type Syntax 

type Syntax struct {
	ProtobufVersion string

	// ProtobufVersionQuote includes quotes
	ProtobufVersionQuote string

	// Comments are the optional ones placed at the beginning.
	Comments []*Comment
	// InlineComment is the optional one placed at the ending.
	InlineComment *Comment
	// Meta is the meta information.
	Meta meta.Meta
}

Syntax is used to define the protobuf version.

func (*Syntax) Accept 

func (s *Syntax) Accept(v Visitor)

Accept dispatches the call to the visitor.

func (*Syntax) SetInlineComment 

func (s *Syntax) SetInlineComment(comment *Comment)

SetInlineComment implements the HasInlineCommentSetter interface.

func (*Syntax) Version 

func (s *Syntax) Version() int

Version returns the version number.

type Visitee 

type Visitee interface {
	Accept(v Visitor)
}

Visitee is implemented by all Protocol Buffer elements.

type Visitor 

type Visitor interface {
	VisitComment(*Comment)
	VisitDeclaration(*Declaration) (next bool)
	VisitEdition(*Edition) (next bool)
	VisitEmptyStatement(*EmptyStatement) (next bool)
	VisitEnum(*Enum) (next bool)
	VisitEnumField(*EnumField) (next bool)
	VisitExtend(*Extend) (next bool)
	VisitExtensions(*Extensions) (next bool)
	VisitField(*Field) (next bool)
	VisitGroupField(*GroupField) (next bool)
	VisitImport(*Import) (next bool)
	VisitMapField(*MapField) (next bool)
	VisitMessage(*Message) (next bool)
	VisitOneof(*Oneof) (next bool)
	VisitOneofField(*OneofField) (next bool)
	VisitOption(*Option) (next bool)
	VisitPackage(*Package) (next bool)
	VisitReserved(*Reserved) (next bool)
	VisitRPC(*RPC) (next bool)
	VisitService(*Service) (next bool)
	VisitSyntax(*Syntax) (next bool)
}

Visitor is for dispatching Protocol Buffer elements.

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