generator

package
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 Go to latest Published: Apr 5, 2017 License: BSD-3-Clause Imports: 17 Imported by: 0

Documentation

Overview

The code generator for the plugin for the Google protocol buffer compiler. It generates Go code from the protocol buffer description files read by the main routine.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func CamelCase 

func CamelCase(s string) string

CamelCase returns the CamelCased name. If there is an interior underscore followed by a lower case letter, drop the underscore and convert the letter to upper case. There is a remote possibility of this rewrite causing a name collision, but it's so remote we're prepared to pretend it's nonexistent - since the C++ generator lowercases names, it's extremely unlikely to have two fields with different capitalizations. In short, _my_field_name_2 becomes XMyFieldName_2.

func CamelCaseSlice 

func CamelCaseSlice(elem []string) string

CamelCaseSlice is like CamelCase, but the argument is a slice of strings to be joined with "_".

func GoPackageName 

func GoPackageName(f fileDescriptorLike) string

Given the original file descriptor, return the desired go package name. This solves the problem of (proto) package level import cycles by allowing proto files to declare go package for import.

func RegisterPlugin 

func RegisterPlugin(p Plugin)

RegisterPlugin installs a (second-order) plugin to be run when the Go output is generated. It is typically called during initialization.

func RegisterUniquePackageName 

func RegisterUniquePackageName(pkg string, f *FileDescriptor) string

Create and remember a guaranteed unique package name for this file descriptor. Pkg is the candidate name. If f is nil, it's a builtin package like "proto" and has no file descriptor.

Types

type Descriptor 

type Descriptor struct {
	*descriptor.DescriptorProto
	// contains filtered or unexported fields
}

Descriptor represents a protocol buffer message.

func (*Descriptor) File 

func (c *Descriptor) File() *descriptor.FileDescriptorProto

func (*Descriptor) PackageName 

func (c *Descriptor) PackageName() string

PackageName is name in the package clause in the generated file.

func (*Descriptor) TypeName 

func (d *Descriptor) TypeName() []string

TypeName returns the elements of the dotted type name. The package name is not part of this name.

type EnumDescriptor 

type EnumDescriptor struct {
	*descriptor.EnumDescriptorProto
	// contains filtered or unexported fields
}

EnumDescriptor describes an enum. If it's at top level, its parent will be nil. Otherwise it will be the descriptor of the message in which it is defined.

func (*EnumDescriptor) File 

func (c *EnumDescriptor) File() *descriptor.FileDescriptorProto

func (*EnumDescriptor) PackageName 

func (c *EnumDescriptor) PackageName() string

PackageName is name in the package clause in the generated file.

func (*EnumDescriptor) TypeName 

func (e *EnumDescriptor) TypeName() (s []string)

TypeName returns the elements of the dotted type name. The package name is not part of this name.

type ExtensionDescriptor 

type ExtensionDescriptor struct {
	*descriptor.FieldDescriptorProto
	// contains filtered or unexported fields
}

ExtensionDescriptor describes an extension. If it's at top level, its parent will be nil. Otherwise it will be the descriptor of the message in which it is defined.

func (*ExtensionDescriptor) DescName 

func (e *ExtensionDescriptor) DescName() string

DescName returns the variable name used for the generated descriptor.

func (*ExtensionDescriptor) File 

func (c *ExtensionDescriptor) File() *descriptor.FileDescriptorProto

func (*ExtensionDescriptor) PackageName 

func (c *ExtensionDescriptor) PackageName() string

PackageName is name in the package clause in the generated file.

func (*ExtensionDescriptor) TypeName 

func (e *ExtensionDescriptor) TypeName() (s []string)

TypeName returns the elements of the dotted type name. The package name is not part of this name.

type FileDescriptor 

type FileDescriptor struct {
	*descriptor.FileDescriptorProto
	// contains filtered or unexported fields
}

FileDescriptor describes an protocol buffer descriptor file (.proto). It includes slices of all the messages and enums defined within it. Those slices are constructed by WrapTypes.

func (*FileDescriptor) PackageName 

func (d *FileDescriptor) PackageName() string

PackageName is the package name we'll use in the generated code to refer to this file.

func (*FileDescriptor) VarName 

func (d *FileDescriptor) VarName() string

VarName is the variable name we'll use in the generated code to refer to the compressed bytes of this descriptor. It is not exported, so it is only valid inside the generated package.

type Generator 

type Generator struct {
	*bytes.Buffer

	Request  *plugin.CodeGeneratorRequest  // The input.
	Response *plugin.CodeGeneratorResponse // The output.

	Param             map[string]string // Command-line parameters.
	PackageImportPath string            // Go import path of the package we're generating code for
	ImportPrefix      string            // String to prefix to imported package file names.
	ImportMap         map[string]string // Mapping from .proto file name to import path (import name to generated name)
	ImportPrefixProto string            // String to prefix to imported package file names; only for protos

	Pkg map[string]string // The names under which we import support packages
	// contains filtered or unexported fields
}

Generator is the type whose methods generate the output, stored in the associated response structure.

func New 

func New() *Generator

New creates a new generator and allocates the request and response protobufs.

func (*Generator) BuildTypeNameMap 

func (g *Generator) BuildTypeNameMap()

BuildTypeNameMap builds the map from fully qualified type names to objects. The key names for the map come from the input data, which puts a period at the beginning. It should be called after SetPackageNames and before GenerateAllFiles.

func (*Generator) CommandLineParameters 

func (g *Generator) CommandLineParameters(parameter string)

CommandLineParameters breaks the comma-separated list of key=value pairs in the parameter (a member of the request protobuf) into a key/value map. It then sets file name mappings defined by those entries.

func (*Generator) DefaultPackageName 

func (g *Generator) DefaultPackageName(obj Object) string

DefaultPackageName returns the package name printed for the object. If its file is in a different package, it returns the package name we're using for this file, plus ".". Otherwise it returns the empty string.

func (*Generator) Error 

func (g *Generator) Error(err error, msgs ...string)

Error reports a problem, including an error, and exits the program.

func (*Generator) Fail 

func (g *Generator) Fail(msgs ...string)

Fail reports a problem and exits the program.

func (*Generator) FileOf 

func (g *Generator) FileOf(fd *descriptor.FileDescriptorProto) *FileDescriptor

FileOf return the FileDescriptor for this FileDescriptorProto.

func (*Generator) GenerateAllFiles 

func (g *Generator) GenerateAllFiles()

GenerateAllFiles generates the output for all the files we're outputting.

func (*Generator) GoType 

func (g *Generator) GoType(message *Descriptor, field *descriptor.FieldDescriptorProto) (typ string, wire string)

GoType returns a string representing the type name, and the wire type

func (*Generator) In 

func (g *Generator) In()

In Indents the output one tab stop.

func (*Generator) ObjectNamed 

func (g *Generator) ObjectNamed(typeName string) Object

ObjectNamed, given a fully-qualified input type name as it appears in the input data, returns the descriptor for the message or enum with that name.

func (*Generator) Out 

func (g *Generator) Out()

Out unindents the output one tab stop.

func (*Generator) P 

func (g *Generator) P(str ...interface{})

P prints the arguments to the generated output. It handles strings and int32s, plus handling indirections because they may be *string, etc.

func (*Generator) PrintComments 

func (g *Generator) PrintComments(path string) bool

PrintComments prints any comments from the source .proto file. The path is a comma-separated list of integers. It returns an indication of whether any comments were printed. See descriptor.proto for its format.

func (*Generator) RecordTypeUse 

func (g *Generator) RecordTypeUse(t string)

func (*Generator) SetPackageNames 

func (g *Generator) SetPackageNames()

SetPackageNames sets the package name for this run. The package name must agree across all files being generated. It also defines unique package names for all imported files.

func (*Generator) TypeName 

func (g *Generator) TypeName(obj Object) string

TypeName is the printed name appropriate for an item. If the object is in the current file, TypeName drops the package name and underscores the rest. Otherwise the object is from another package; and the result is the underscored package name followed by the item name. The result always has an initial capital.

func (*Generator) TypeNameWithPackage 

func (g *Generator) TypeNameWithPackage(obj Object) string

TypeNameWithPackage is like TypeName, but always includes the package name even if the object is in our own package.

func (*Generator) WrapTypes 

func (g *Generator) WrapTypes()

WrapTypes walks the incoming data, wrapping DescriptorProtos, EnumDescriptorProtos and FileDescriptorProtos into file-referenced objects within the Generator. It also creates the list of files to generate and so should be called before GenerateAllFiles.

type ImportedDescriptor 

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

ImportedDescriptor describes a type that has been publicly imported from another file.

func (*ImportedDescriptor) File 

func (c *ImportedDescriptor) File() *descriptor.FileDescriptorProto

func (*ImportedDescriptor) PackageName 

func (c *ImportedDescriptor) PackageName() string

PackageName is name in the package clause in the generated file.

func (*ImportedDescriptor) TypeName 

func (id *ImportedDescriptor) TypeName() []string

type Object 

type Object interface {
	PackageName() string // The name we use in our output (a_b_c), possibly renamed for uniqueness.
	TypeName() []string
	File() *descriptor.FileDescriptorProto
}

Object is an interface abstracting the abilities shared by enums, messages, extensions and imported objects.

type Plugin 

type Plugin interface {
	// Name identifies the plugin.
	Name() string
	// Init is called once after data structures are built but before
	// code generation begins.
	Init(g *Generator)
	// Generate produces the code generated by the plugin for this file,
	// except for the imports, by calling the generator's methods P, In, and Out.
	Generate(file *FileDescriptor)
	// GenerateImports produces the import declarations for this file.
	// It is called after Generate.
	GenerateImports(file *FileDescriptor)
}

A Plugin provides functionality to add to the output during Go code generation, such as to produce RPC stubs.

Source Files

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