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Diffstat (limited to 'vendor/github.com/golang/protobuf/proto/lib.go')
| -rw-r--r-- | vendor/github.com/golang/protobuf/proto/lib.go | 894 |
1 files changed, 894 insertions, 0 deletions
diff --git a/vendor/github.com/golang/protobuf/proto/lib.go b/vendor/github.com/golang/protobuf/proto/lib.go new file mode 100644 index 0000000..0de8f8d --- /dev/null +++ b/vendor/github.com/golang/protobuf/proto/lib.go @@ -0,0 +1,894 @@ +// Go support for Protocol Buffers - Google's data interchange format +// +// Copyright 2010 The Go Authors. All rights reserved. +// https://github.com/golang/protobuf +// +// 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. + +/* +Package proto converts data structures to and from the wire format of +protocol buffers. It works in concert with the Go source code generated +for .proto files by the protocol compiler. + +A summary of the properties of the protocol buffer interface +for a protocol buffer variable v: + + - Names are turned from camel_case to CamelCase for export. + - There are no methods on v to set fields; just treat + them as structure fields. + - There are getters that return a field's value if set, + and return the field's default value if unset. + The getters work even if the receiver is a nil message. + - The zero value for a struct is its correct initialization state. + All desired fields must be set before marshaling. + - A Reset() method will restore a protobuf struct to its zero state. + - Non-repeated fields are pointers to the values; nil means unset. + That is, optional or required field int32 f becomes F *int32. + - Repeated fields are slices. + - Helper functions are available to aid the setting of fields. + msg.Foo = proto.String("hello") // set field + - Constants are defined to hold the default values of all fields that + have them. They have the form Default_StructName_FieldName. + Because the getter methods handle defaulted values, + direct use of these constants should be rare. + - Enums are given type names and maps from names to values. + Enum values are prefixed by the enclosing message's name, or by the + enum's type name if it is a top-level enum. Enum types have a String + method, and a Enum method to assist in message construction. + - Nested messages, groups and enums have type names prefixed with the name of + the surrounding message type. + - Extensions are given descriptor names that start with E_, + followed by an underscore-delimited list of the nested messages + that contain it (if any) followed by the CamelCased name of the + extension field itself. HasExtension, ClearExtension, GetExtension + and SetExtension are functions for manipulating extensions. + - Oneof field sets are given a single field in their message, + with distinguished wrapper types for each possible field value. + - Marshal and Unmarshal are functions to encode and decode the wire format. + +When the .proto file specifies `syntax="proto3"`, there are some differences: + + - Non-repeated fields of non-message type are values instead of pointers. + - Getters are only generated for message and oneof fields. + - Enum types do not get an Enum method. + +The simplest way to describe this is to see an example. +Given file test.proto, containing + + package example; + + enum FOO { X = 17; } + + message Test { + required string label = 1; + optional int32 type = 2 [default=77]; + repeated int64 reps = 3; + optional group OptionalGroup = 4 { + required string RequiredField = 5; + } + oneof union { + int32 number = 6; + string name = 7; + } + } + +The resulting file, test.pb.go, is: + + package example + + import proto "github.com/golang/protobuf/proto" + import math "math" + + type FOO int32 + const ( + FOO_X FOO = 17 + ) + var FOO_name = map[int32]string{ + 17: "X", + } + var FOO_value = map[string]int32{ + "X": 17, + } + + func (x FOO) Enum() *FOO { + p := new(FOO) + *p = x + return p + } + func (x FOO) String() string { + return proto.EnumName(FOO_name, int32(x)) + } + func (x *FOO) UnmarshalJSON(data []byte) error { + value, err := proto.UnmarshalJSONEnum(FOO_value, data) + if err != nil { + return err + } + *x = FOO(value) + return nil + } + + type Test struct { + Label *string `protobuf:"bytes,1,req,name=label" json:"label,omitempty"` + Type *int32 `protobuf:"varint,2,opt,name=type,def=77" json:"type,omitempty"` + Reps []int64 `protobuf:"varint,3,rep,name=reps" json:"reps,omitempty"` + Optionalgroup *Test_OptionalGroup `protobuf:"group,4,opt,name=OptionalGroup" json:"optionalgroup,omitempty"` + // Types that are valid to be assigned to Union: + // *Test_Number + // *Test_Name + Union isTest_Union `protobuf_oneof:"union"` + XXX_unrecognized []byte `json:"-"` + } + func (m *Test) Reset() { *m = Test{} } + func (m *Test) String() string { return proto.CompactTextString(m) } + func (*Test) ProtoMessage() {} + + type isTest_Union interface { + isTest_Union() + } + + type Test_Number struct { + Number int32 `protobuf:"varint,6,opt,name=number"` + } + type Test_Name struct { + Name string `protobuf:"bytes,7,opt,name=name"` + } + + func (*Test_Number) isTest_Union() {} + func (*Test_Name) isTest_Union() {} + + func (m *Test) GetUnion() isTest_Union { + if m != nil { + return m.Union + } + return nil + } + const Default_Test_Type int32 = 77 + + func (m *Test) GetLabel() string { + if m != nil && m.Label != nil { + return *m.Label + } + return "" + } + + func (m *Test) GetType() int32 { + if m != nil && m.Type != nil { + return *m.Type + } + return Default_Test_Type + } + + func (m *Test) GetOptionalgroup() *Test_OptionalGroup { + if m != nil { + return m.Optionalgroup + } + return nil + } + + type Test_OptionalGroup struct { + RequiredField *string `protobuf:"bytes,5,req" json:"RequiredField,omitempty"` + } + func (m *Test_OptionalGroup) Reset() { *m = Test_OptionalGroup{} } + func (m *Test_OptionalGroup) String() string { return proto.CompactTextString(m) } + + func (m *Test_OptionalGroup) GetRequiredField() string { + if m != nil && m.RequiredField != nil { + return *m.RequiredField + } + return "" + } + + func (m *Test) GetNumber() int32 { + if x, ok := m.GetUnion().(*Test_Number); ok { + return x.Number + } + return 0 + } + + func (m *Test) GetName() string { + if x, ok := m.GetUnion().(*Test_Name); ok { + return x.Name + } + return "" + } + + func init() { + proto.RegisterEnum("example.FOO", FOO_name, FOO_value) + } + +To create and play with a Test object: + + package main + + import ( + "log" + + "github.com/golang/protobuf/proto" + pb "./example.pb" + ) + + func main() { + test := &pb.Test{ + Label: proto.String("hello"), + Type: proto.Int32(17), + Reps: []int64{1, 2, 3}, + Optionalgroup: &pb.Test_OptionalGroup{ + RequiredField: proto.String("good bye"), + }, + Union: &pb.Test_Name{"fred"}, + } + data, err := proto.Marshal(test) + if err != nil { + log.Fatal("marshaling error: ", err) + } + newTest := &pb.Test{} + err = proto.Unmarshal(data, newTest) + if err != nil { + log.Fatal("unmarshaling error: ", err) + } + // Now test and newTest contain the same data. + if test.GetLabel() != newTest.GetLabel() { + log.Fatalf("data mismatch %q != %q", test.GetLabel(), newTest.GetLabel()) + } + // Use a type switch to determine which oneof was set. + switch u := test.Union.(type) { + case *pb.Test_Number: // u.Number contains the number. + case *pb.Test_Name: // u.Name contains the string. + } + // etc. + } +*/ +package proto + +import ( + "encoding/json" + "fmt" + "log" + "reflect" + "sort" + "strconv" + "sync" +) + +// Message is implemented by generated protocol buffer messages. +type Message interface { + Reset() + String() string + ProtoMessage() +} + +// Stats records allocation details about the protocol buffer encoders +// and decoders. Useful for tuning the library itself. +type Stats struct { + Emalloc uint64 // mallocs in encode + Dmalloc uint64 // mallocs in decode + Encode uint64 // number of encodes + Decode uint64 // number of decodes + Chit uint64 // number of cache hits + Cmiss uint64 // number of cache misses + Size uint64 // number of sizes +} + +// Set to true to enable stats collection. +const collectStats = false + +var stats Stats + +// GetStats returns a copy of the global Stats structure. +func GetStats() Stats { return stats } + +// A Buffer is a buffer manager for marshaling and unmarshaling +// protocol buffers. It may be reused between invocations to +// reduce memory usage. It is not necessary to use a Buffer; +// the global functions Marshal and Unmarshal create a +// temporary Buffer and are fine for most applications. +type Buffer struct { + buf []byte // encode/decode byte stream + index int // write point + + // pools of basic types to amortize allocation. + bools []bool + uint32s []uint32 + uint64s []uint64 + + // extra pools, only used with pointer_reflect.go + int32s []int32 + int64s []int64 + float32s []float32 + float64s []float64 +} + +// NewBuffer allocates a new Buffer and initializes its internal data to +// the contents of the argument slice. +func NewBuffer(e []byte) *Buffer { + return &Buffer{buf: e} +} + +// Reset resets the Buffer, ready for marshaling a new protocol buffer. +func (p *Buffer) Reset() { + p.buf = p.buf[0:0] // for reading/writing + p.index = 0 // for reading +} + +// SetBuf replaces the internal buffer with the slice, +// ready for unmarshaling the contents of the slice. +func (p *Buffer) SetBuf(s []byte) { + p.buf = s + p.index = 0 +} + +// Bytes returns the contents of the Buffer. +func (p *Buffer) Bytes() []byte { return p.buf } + +/* + * Helper routines for simplifying the creation of optional fields of basic type. + */ + +// Bool is a helper routine that allocates a new bool value +// to store v and returns a pointer to it. +func Bool(v bool) *bool { + return &v +} + +// Int32 is a helper routine that allocates a new int32 value +// to store v and returns a pointer to it. +func Int32(v int32) *int32 { + return &v +} + +// Int is a helper routine that allocates a new int32 value +// to store v and returns a pointer to it, but unlike Int32 +// its argument value is an int. +func Int(v int) *int32 { + p := new(int32) + *p = int32(v) + return p +} + +// Int64 is a helper routine that allocates a new int64 value +// to store v and returns a pointer to it. +func Int64(v int64) *int64 { + return &v +} + +// Float32 is a helper routine that allocates a new float32 value +// to store v and returns a pointer to it. +func Float32(v float32) *float32 { + return &v +} + +// Float64 is a helper routine that allocates a new float64 value +// to store v and returns a pointer to it. +func Float64(v float64) *float64 { + return &v +} + +// Uint32 is a helper routine that allocates a new uint32 value +// to store v and returns a pointer to it. +func Uint32(v uint32) *uint32 { + return &v +} + +// Uint64 is a helper routine that allocates a new uint64 value +// to store v and returns a pointer to it. +func Uint64(v uint64) *uint64 { + return &v +} + +// String is a helper routine that allocates a new string value +// to store v and returns a pointer to it. +func String(v string) *string { + return &v +} + +// EnumName is a helper function to simplify printing protocol buffer enums +// by name. Given an enum map and a value, it returns a useful string. +func EnumName(m map[int32]string, v int32) string { + s, ok := m[v] + if ok { + return s + } + return strconv.Itoa(int(v)) +} + +// UnmarshalJSONEnum is a helper function to simplify recovering enum int values +// from their JSON-encoded representation. Given a map from the enum's symbolic +// names to its int values, and a byte buffer containing the JSON-encoded +// value, it returns an int32 that can be cast to the enum type by the caller. +// +// The function can deal with both JSON representations, numeric and symbolic. +func UnmarshalJSONEnum(m map[string]int32, data []byte, enumName string) (int32, error) { + if data[0] == '"' { + // New style: enums are strings. + var repr string + if err := json.Unmarshal(data, &repr); err != nil { + return -1, err + } + val, ok := m[repr] + if !ok { + return 0, fmt.Errorf("unrecognized enum %s value %q", enumName, repr) + } + return val, nil + } + // Old style: enums are ints. + var val int32 + if err := json.Unmarshal(data, &val); err != nil { + return 0, fmt.Errorf("cannot unmarshal %#q into enum %s", data, enumName) + } + return val, nil +} + +// DebugPrint dumps the encoded data in b in a debugging format with a header +// including the string s. Used in testing but made available for general debugging. +func (p *Buffer) DebugPrint(s string, b []byte) { + var u uint64 + + obuf := p.buf + index := p.index + p.buf = b + p.index = 0 + depth := 0 + + fmt.Printf("\n--- %s ---\n", s) + +out: + for { + for i := 0; i < depth; i++ { + fmt.Print(" ") + } + + index := p.index + if index == len(p.buf) { + break + } + + op, err := p.DecodeVarint() + if err != nil { + fmt.Printf("%3d: fetching op err %v\n", index, err) + break out + } + tag := op >> 3 + wire := op & 7 + + switch wire { + default: + fmt.Printf("%3d: t=%3d unknown wire=%d\n", + index, tag, wire) + break out + + case WireBytes: + var r []byte + + r, err = p.DecodeRawBytes(false) + if err != nil { + break out + } + fmt.Printf("%3d: t=%3d bytes [%d]", index, tag, len(r)) + if len(r) <= 6 { + for i := 0; i < len(r); i++ { + fmt.Printf(" %.2x", r[i]) + } + } else { + for i := 0; i < 3; i++ { + fmt.Printf(" %.2x", r[i]) + } + fmt.Printf(" ..") + for i := len(r) - 3; i < len(r); i++ { + fmt.Printf(" %.2x", r[i]) + } + } + fmt.Printf("\n") + + case WireFixed32: + u, err = p.DecodeFixed32() + if err != nil { + fmt.Printf("%3d: t=%3d fix32 err %v\n", index, tag, err) + break out + } + fmt.Printf("%3d: t=%3d fix32 %d\n", index, tag, u) + + case WireFixed64: + u, err = p.DecodeFixed64() + if err != nil { + fmt.Printf("%3d: t=%3d fix64 err %v\n", index, tag, err) + break out + } + fmt.Printf("%3d: t=%3d fix64 %d\n", index, tag, u) + + case WireVarint: + u, err = p.DecodeVarint() + if err != nil { + fmt.Printf("%3d: t=%3d varint err %v\n", index, tag, err) + break out + } + fmt.Printf("%3d: t=%3d varint %d\n", index, tag, u) + + case WireStartGroup: + fmt.Printf("%3d: t=%3d start\n", index, tag) + depth++ + + case WireEndGroup: + depth-- + fmt.Printf("%3d: t=%3d end\n", index, tag) + } + } + + if depth != 0 { + fmt.Printf("%3d: start-end not balanced %d\n", p.index, depth) + } + fmt.Printf("\n") + + p.buf = obuf + p.index = index +} + +// SetDefaults sets unset protocol buffer fields to their default values. +// It only modifies fields that are both unset and have defined defaults. +// It recursively sets default values in any non-nil sub-messages. +func SetDefaults(pb Message) { + setDefaults(reflect.ValueOf(pb), true, false) +} + +// v is a pointer to a struct. +func setDefaults(v reflect.Value, recur, zeros bool) { + v = v.Elem() + + defaultMu.RLock() + dm, ok := defaults[v.Type()] + defaultMu.RUnlock() + if !ok { + dm = buildDefaultMessage(v.Type()) + defaultMu.Lock() + defaults[v.Type()] = dm + defaultMu.Unlock() + } + + for _, sf := range dm.scalars { + f := v.Field(sf.index) + if !f.IsNil() { + // field already set + continue + } + dv := sf.value + if dv == nil && !zeros { + // no explicit default, and don't want to set zeros + continue + } + fptr := f.Addr().Interface() // **T + // TODO: Consider batching the allocations we do here. + switch sf.kind { + case reflect.Bool: + b := new(bool) + if dv != nil { + *b = dv.(bool) + } + *(fptr.(**bool)) = b + case reflect.Float32: + f := new(float32) + if dv != nil { + *f = dv.(float32) + } + *(fptr.(**float32)) = f + case reflect.Float64: + f := new(float64) + if dv != nil { + *f = dv.(float64) + } + *(fptr.(**float64)) = f + case reflect.Int32: + // might be an enum + if ft := f.Type(); ft != int32PtrType { + // enum + f.Set(reflect.New(ft.Elem())) + if dv != nil { + f.Elem().SetInt(int64(dv.(int32))) + } + } else { + // int32 field + i := new(int32) + if dv != nil { + *i = dv.(int32) + } + *(fptr.(**int32)) = i + } + case reflect.Int64: + i := new(int64) + if dv != nil { + *i = dv.(int64) + } + *(fptr.(**int64)) = i + case reflect.String: + s := new(string) + if dv != nil { + *s = dv.(string) + } + *(fptr.(**string)) = s + case reflect.Uint8: + // exceptional case: []byte + var b []byte + if dv != nil { + db := dv.([]byte) + b = make([]byte, len(db)) + copy(b, db) + } else { + b = []byte{} + } + *(fptr.(*[]byte)) = b + case reflect.Uint32: + u := new(uint32) + if dv != nil { + *u = dv.(uint32) + } + *(fptr.(**uint32)) = u + case reflect.Uint64: + u := new(uint64) + if dv != nil { + *u = dv.(uint64) + } + *(fptr.(**uint64)) = u + default: + log.Printf("proto: can't set default for field %v (sf.kind=%v)", f, sf.kind) + } + } + + for _, ni := range dm.nested { + f := v.Field(ni) + // f is *T or []*T or map[T]*T + switch f.Kind() { + case reflect.Ptr: + if f.IsNil() { + continue + } + setDefaults(f, recur, zeros) + + case reflect.Slice: + for i := 0; i < f.Len(); i++ { + e := f.Index(i) + if e.IsNil() { + continue + } + setDefaults(e, recur, zeros) + } + + case reflect.Map: + for _, k := range f.MapKeys() { + e := f.MapIndex(k) + if e.IsNil() { + continue + } + setDefaults(e, recur, zeros) + } + } + } +} + +var ( + // defaults maps a protocol buffer struct type to a slice of the fields, + // with its scalar fields set to their proto-declared non-zero default values. + defaultMu sync.RWMutex + defaults = make(map[reflect.Type]defaultMessage) + + int32PtrType = reflect.TypeOf((*int32)(nil)) +) + +// defaultMessage represents information about the default values of a message. +type defaultMessage struct { + scalars []scalarField + nested []int // struct field index of nested messages +} + +type scalarField struct { + index int // struct field index + kind reflect.Kind // element type (the T in *T or []T) + value interface{} // the proto-declared default value, or nil +} + +// t is a struct type. +func buildDefaultMessage(t reflect.Type) (dm defaultMessage) { + sprop := GetProperties(t) + for _, prop := range sprop.Prop { + fi, ok := sprop.decoderTags.get(prop.Tag) + if !ok { + // XXX_unrecognized + continue + } + ft := t.Field(fi).Type + + sf, nested, err := fieldDefault(ft, prop) + switch { + case err != nil: + log.Print(err) + case nested: + dm.nested = append(dm.nested, fi) + case sf != nil: + sf.index = fi + dm.scalars = append(dm.scalars, *sf) + } + } + + return dm +} + +// fieldDefault returns the scalarField for field type ft. +// sf will be nil if the field can not have a default. +// nestedMessage will be true if this is a nested message. +// Note that sf.index is not set on return. +func fieldDefault(ft reflect.Type, prop *Properties) (sf *scalarField, nestedMessage bool, err error) { + var canHaveDefault bool + switch ft.Kind() { + case reflect.Ptr: + if ft.Elem().Kind() == reflect.Struct { + nestedMessage = true + } else { + canHaveDefault = true // proto2 scalar field + } + + case reflect.Slice: + switch ft.Elem().Kind() { + case reflect.Ptr: + nestedMessage = true // repeated message + case reflect.Uint8: + canHaveDefault = true // bytes field + } + + case reflect.Map: + if ft.Elem().Kind() == reflect.Ptr { + nestedMessage = true // map with message values + } + } + + if !canHaveDefault { + if nestedMessage { + return nil, true, nil + } + return nil, false, nil + } + + // We now know that ft is a pointer or slice. + sf = &scalarField{kind: ft.Elem().Kind()} + + // scalar fields without defaults + if !prop.HasDefault { + return sf, false, nil + } + + // a scalar field: either *T or []byte + switch ft.Elem().Kind() { + case reflect.Bool: + x, err := strconv.ParseBool(prop.Default) + if err != nil { + return nil, false, fmt.Errorf("proto: bad default bool %q: %v", prop.Default, err) + } + sf.value = x + case reflect.Float32: + x, err := strconv.ParseFloat(prop.Default, 32) + if err != nil { + return nil, false, fmt.Errorf("proto: bad default float32 %q: %v", prop.Default, err) + } + sf.value = float32(x) + case reflect.Float64: + x, err := strconv.ParseFloat(prop.Default, 64) + if err != nil { + return nil, false, fmt.Errorf("proto: bad default float64 %q: %v", prop.Default, err) + } + sf.value = x + case reflect.Int32: + x, err := strconv.ParseInt(prop.Default, 10, 32) + if err != nil { + return nil, false, fmt.Errorf("proto: bad default int32 %q: %v", prop.Default, err) + } + sf.value = int32(x) + case reflect.Int64: + x, err := strconv.ParseInt(prop.Default, 10, 64) + if err != nil { + return nil, false, fmt.Errorf("proto: bad default int64 %q: %v", prop.Default, err) + } + sf.value = x + case reflect.String: + sf.value = prop.Default + case reflect.Uint8: + // []byte (not *uint8) + sf.value = []byte(prop.Default) + case reflect.Uint32: + x, err := strconv.ParseUint(prop.Default, 10, 32) + if err != nil { + return nil, false, fmt.Errorf("proto: bad default uint32 %q: %v", prop.Default, err) + } + sf.value = uint32(x) + case reflect.Uint64: + x, err := strconv.ParseUint(prop.Default, 10, 64) + if err != nil { + return nil, false, fmt.Errorf("proto: bad default uint64 %q: %v", prop.Default, err) + } + sf.value = x + default: + return nil, false, fmt.Errorf("proto: unhandled def kind %v", ft.Elem().Kind()) + } + + return sf, false, nil +} + +// Map fields may have key types of non-float scalars, strings and enums. +// The easiest way to sort them in some deterministic order is to use fmt. +// If this turns out to be inefficient we can always consider other options, +// such as doing a Schwartzian transform. + +func mapKeys(vs []reflect.Value) sort.Interface { + s := mapKeySorter{ + vs: vs, + // default Less function: textual comparison + less: func(a, b reflect.Value) bool { + return fmt.Sprint(a.Interface()) < fmt.Sprint(b.Interface()) + }, + } + + // Type specialization per https://developers.google.com/protocol-buffers/docs/proto#maps; + // numeric keys are sorted numerically. + if len(vs) == 0 { + return s + } + switch vs[0].Kind() { + case reflect.Int32, reflect.Int64: + s.less = func(a, b reflect.Value) bool { return a.Int() < b.Int() } + case reflect.Uint32, reflect.Uint64: + s.less = func(a, b reflect.Value) bool { return a.Uint() < b.Uint() } + } + + return s +} + +type mapKeySorter struct { + vs []reflect.Value + less func(a, b reflect.Value) bool +} + +func (s mapKeySorter) Len() int { return len(s.vs) } +func (s mapKeySorter) Swap(i, j int) { s.vs[i], s.vs[j] = s.vs[j], s.vs[i] } +func (s mapKeySorter) Less(i, j int) bool { + return s.less(s.vs[i], s.vs[j]) +} + +// isProto3Zero reports whether v is a zero proto3 value. +func isProto3Zero(v reflect.Value) bool { + switch v.Kind() { + case reflect.Bool: + return !v.Bool() + case reflect.Int32, reflect.Int64: + return v.Int() == 0 + case reflect.Uint32, reflect.Uint64: + return v.Uint() == 0 + case reflect.Float32, reflect.Float64: + return v.Float() == 0 + case reflect.String: + return v.String() == "" + } + return false +} + +// ProtoPackageIsVersion1 is referenced from generated protocol buffer files +// to assert that that code is compatible with this version of the proto package. +const ProtoPackageIsVersion1 = true |