proto/text_test.go - third_party/golang/protobuf - Git at Google

 // 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_test

 import (
 	"bytes"
 	"errors"
 	"io/ioutil"
 	"math"
 	"strings"
 	"testing"

 	"github.com/golang/protobuf/proto"

 	proto3pb "github.com/golang/protobuf/proto/proto3_proto"
 	pb "github.com/golang/protobuf/proto/testdata"
 )

 // textMessage implements the methods that allow it to marshal and unmarshal
 // itself as text.
 type textMessage struct {
 }

 func (*textMessage) MarshalText() ([]byte, error) {
 	return []byte("custom"), nil
 }

 func (*textMessage) UnmarshalText(bytes []byte) error {
 	if string(bytes) != "custom" {
 		return errors.New("expected 'custom'")
 	}
 	return nil
 }

 func (*textMessage) Reset()         {}
 func (*textMessage) String() string { return "" }
 func (*textMessage) ProtoMessage()  {}

 func newTestMessage() *pb.MyMessage {
 	msg := &pb.MyMessage{
 		Count: proto.Int32(42),
 		Name:  proto.String("Dave"),
 		Quote: proto.String(`"I didn't want to go."`),
 		Pet:   []string{"bunny", "kitty", "horsey"},
 		Inner: &pb.InnerMessage{
 			Host:      proto.String("footrest.syd"),
 			Port:      proto.Int32(7001),
 			Connected: proto.Bool(true),
 		},
 		Others: []*pb.OtherMessage{
 			{
 				Key:   proto.Int64(0xdeadbeef),
 				Value: []byte{1, 65, 7, 12},
 			},
 			{
 				Weight: proto.Float32(6.022),
 				Inner: &pb.InnerMessage{
 					Host: proto.String("lesha.mtv"),
 					Port: proto.Int32(8002),
 				},
 			},
 		},
 		Bikeshed: pb.MyMessage_BLUE.Enum(),
 		Somegroup: &pb.MyMessage_SomeGroup{
 			GroupField: proto.Int32(8),
 		},
 		// One normally wouldn't do this.
 		// This is an undeclared tag 13, as a varint (wire type 0) with value 4.
 		XXX_unrecognized: []byte{13<<3 | 0, 4},
 	}
 	ext := &pb.Ext{
 		Data: proto.String("Big gobs for big rats"),
 	}
 	if err := proto.SetExtension(msg, pb.E_Ext_More, ext); err != nil {
 		panic(err)
 	}
 	greetings := []string{"adg", "easy", "cow"}
 	if err := proto.SetExtension(msg, pb.E_Greeting, greetings); err != nil {
 		panic(err)
 	}

 	// Add an unknown extension. We marshal a pb.Ext, and fake the ID.
 	b, err := proto.Marshal(&pb.Ext{Data: proto.String("3G skiing")})
 	if err != nil {
 		panic(err)
 	}
 	b = append(proto.EncodeVarint(201<<3|proto.WireBytes), b...)
 	proto.SetRawExtension(msg, 201, b)

 	// Extensions can be plain fields, too, so let's test that.
 	b = append(proto.EncodeVarint(202<<3|proto.WireVarint), 19)
 	proto.SetRawExtension(msg, 202, b)

 	return msg
 }

 const text = `count: 42
 name: "Dave"
 quote: "\"I didn't want to go.\""
 pet: "bunny"
 pet: "kitty"
 pet: "horsey"
 inner: <
   host: "footrest.syd"
   port: 7001
   connected: true
 >
 others: <
   key: 3735928559
   value: "\001A\007\014"
 >
 others: <
   weight: 6.022
   inner: <
     host: "lesha.mtv"
     port: 8002
   >
 >
 bikeshed: BLUE
 SomeGroup {
   group_field: 8
 }
 /* 2 unknown bytes */
 13: 4
 [testdata.Ext.more]: <
   data: "Big gobs for big rats"
 >
 [testdata.greeting]: "adg"
 [testdata.greeting]: "easy"
 [testdata.greeting]: "cow"
 /* 13 unknown bytes */
 201: "\t3G skiing"
 /* 3 unknown bytes */
 202: 19
 `

 func TestMarshalText(t *testing.T) {
 	buf := new(bytes.Buffer)
 	if err := proto.MarshalText(buf, newTestMessage()); err != nil {
 		t.Fatalf("proto.MarshalText: %v", err)
 	}
 	s := buf.String()
 	if s != text {
 		t.Errorf("Got:\n===\n%v===\nExpected:\n===\n%v===\n", s, text)
 	}
 }

 func TestMarshalTextCustomMessage(t *testing.T) {
 	buf := new(bytes.Buffer)
 	if err := proto.MarshalText(buf, &textMessage{}); err != nil {
 		t.Fatalf("proto.MarshalText: %v", err)
 	}
 	s := buf.String()
 	if s != "custom" {
 		t.Errorf("Got %q, expected %q", s, "custom")
 	}
 }
 func TestMarshalTextNil(t *testing.T) {
 	want := "<nil>"
 	tests := []proto.Message{nil, (*pb.MyMessage)(nil)}
 	for i, test := range tests {
 		buf := new(bytes.Buffer)
 		if err := proto.MarshalText(buf, test); err != nil {
 			t.Fatal(err)
 		}
 		if got := buf.String(); got != want {
 			t.Errorf("%d: got %q want %q", i, got, want)
 		}
 	}
 }

 func TestMarshalTextUnknownEnum(t *testing.T) {
 	// The Color enum only specifies values 0-2.
 	m := &pb.MyMessage{Bikeshed: pb.MyMessage_Color(3).Enum()}
 	got := m.String()
 	const want = `bikeshed:3 `
 	if got != want {
 		t.Errorf("\n got %q\nwant %q", got, want)
 	}
 }

 func TestTextOneof(t *testing.T) {
 	tests := []struct {
 		m    proto.Message
 		want string
 	}{
 		// zero message
 		{&pb.Communique{}, ``},
 		// scalar field
 		{&pb.Communique{Union: &pb.Communique_Number{4}}, `number:4`},
 		// message field
 		{&pb.Communique{Union: &pb.Communique_Msg{
 			&pb.Strings{StringField: proto.String("why hello!")},
 		}}, `msg:<string_field:"why hello!" >`},
 		// bad oneof (should not panic)
 		{&pb.Communique{Union: &pb.Communique_Msg{nil}}, `msg:/* nil */`},
 	}
 	for _, test := range tests {
 		got := strings.TrimSpace(test.m.String())
 		if got != test.want {
 			t.Errorf("\n got %s\nwant %s", got, test.want)
 		}
 	}
 }

 func BenchmarkMarshalTextBuffered(b *testing.B) {
 	buf := new(bytes.Buffer)
 	m := newTestMessage()
 	for i := 0; i < b.N; i++ {
 		buf.Reset()
 		proto.MarshalText(buf, m)
 	}
 }

 func BenchmarkMarshalTextUnbuffered(b *testing.B) {
 	w := ioutil.Discard
 	m := newTestMessage()
 	for i := 0; i < b.N; i++ {
 		proto.MarshalText(w, m)
 	}
 }

 func compact(src string) string {
 	// s/[ \n]+/ /g; s/ $//;
 	dst := make([]byte, len(src))
 	space, comment := false, false
 	j := 0
 	for i := 0; i < len(src); i++ {
 		if strings.HasPrefix(src[i:], "/*") {
 			comment = true
 			i++
 			continue
 		}
 		if comment && strings.HasPrefix(src[i:], "*/") {
 			comment = false
 			i++
 			continue
 		}
 		if comment {
 			continue
 		}
 		c := src[i]
 		if c == ' ' || c == '\n' {
 			space = true
 			continue
 		}
 		if j > 0 && (dst[j-1] == ':' || dst[j-1] == '<' || dst[j-1] == '{') {
 			space = false
 		}
 		if c == '{' {
 			space = false
 		}
 		if space {
 			dst[j] = ' '
 			j++
 			space = false
 		}
 		dst[j] = c
 		j++
 	}
 	if space {
 		dst[j] = ' '
 		j++
 	}
 	return string(dst[0:j])
 }

 var compactText = compact(text)

 func TestCompactText(t *testing.T) {
 	s := proto.CompactTextString(newTestMessage())
 	if s != compactText {
 		t.Errorf("Got:\n===\n%v===\nExpected:\n===\n%v\n===\n", s, compactText)
 	}
 }

 func TestStringEscaping(t *testing.T) {
 	testCases := []struct {
 		in  *pb.Strings
 		out string
 	}{
 		{
 			// Test data from C++ test (TextFormatTest.StringEscape).
 			// Single divergence: we don't escape apostrophes.
 			&pb.Strings{StringField: proto.String("\"A string with ' characters \n and \r newlines and \t tabs and \001 slashes \\ and  multiple   spaces")},
 			"string_field: \"\\\"A string with ' characters \\n and \\r newlines and \\t tabs and \\001 slashes \\\\ and  multiple   spaces\"\n",
 		},
 		{
 			// Test data from the same C++ test.
 			&pb.Strings{StringField: proto.String("\350\260\267\346\255\214")},
 			"string_field: \"\\350\\260\\267\\346\\255\\214\"\n",
 		},
 		{
 			// Some UTF-8.
 			&pb.Strings{StringField: proto.String("\x00\x01\xff\x81")},
 			`string_field: "\000\001\377\201"` + "\n",
 		},
 	}

 	for i, tc := range testCases {
 		var buf bytes.Buffer
 		if err := proto.MarshalText(&buf, tc.in); err != nil {
 			t.Errorf("proto.MarsalText: %v", err)
 			continue
 		}
 		s := buf.String()
 		if s != tc.out {
 			t.Errorf("#%d: Got:\n%s\nExpected:\n%s\n", i, s, tc.out)
 			continue
 		}

 		// Check round-trip.
 		pb := new(pb.Strings)
 		if err := proto.UnmarshalText(s, pb); err != nil {
 			t.Errorf("#%d: UnmarshalText: %v", i, err)
 			continue
 		}
 		if !proto.Equal(pb, tc.in) {
 			t.Errorf("#%d: Round-trip failed:\nstart: %v\n  end: %v", i, tc.in, pb)
 		}
 	}
 }

 // A limitedWriter accepts some output before it fails.
 // This is a proxy for something like a nearly-full or imminently-failing disk,
 // or a network connection that is about to die.
 type limitedWriter struct {
 	b     bytes.Buffer
 	limit int
 }

 var outOfSpace = errors.New("proto: insufficient space")

 func (w *limitedWriter) Write(p []byte) (n int, err error) {
 	var avail = w.limit - w.b.Len()
 	if avail <= 0 {
 		return 0, outOfSpace
 	}
 	if len(p) <= avail {
 		return w.b.Write(p)
 	}
 	n, _ = w.b.Write(p[:avail])
 	return n, outOfSpace
 }

 func TestMarshalTextFailing(t *testing.T) {
 	// Try lots of different sizes to exercise more error code-paths.
 	for lim := 0; lim < len(text); lim++ {
 		buf := new(limitedWriter)
 		buf.limit = lim
 		err := proto.MarshalText(buf, newTestMessage())
 		// We expect a certain error, but also some partial results in the buffer.
 		if err != outOfSpace {
 			t.Errorf("Got:\n===\n%v===\nExpected:\n===\n%v===\n", err, outOfSpace)
 		}
 		s := buf.b.String()
 		x := text[:buf.limit]
 		if s != x {
 			t.Errorf("Got:\n===\n%v===\nExpected:\n===\n%v===\n", s, x)
 		}
 	}
 }

 func TestFloats(t *testing.T) {
 	tests := []struct {
 		f    float64
 		want string
 	}{
 		{0, "0"},
 		{4.7, "4.7"},
 		{math.Inf(1), "inf"},
 		{math.Inf(-1), "-inf"},
 		{math.NaN(), "nan"},
 	}
 	for _, test := range tests {
 		msg := &pb.FloatingPoint{F: &test.f}
 		got := strings.TrimSpace(msg.String())
 		want := `f:` + test.want
 		if got != want {
 			t.Errorf("f=%f: got %q, want %q", test.f, got, want)
 		}
 	}
 }

 func TestRepeatedNilText(t *testing.T) {
 	m := &pb.MessageList{
 		Message: []*pb.MessageList_Message{
 			nil,
 			&pb.MessageList_Message{
 				Name: proto.String("Horse"),
 			},
 			nil,
 		},
 	}
 	want := `Message <nil>
 Message {
   name: "Horse"
 }
 Message <nil>
 `
 	if s := proto.MarshalTextString(m); s != want {
 		t.Errorf(" got: %s\nwant: %s", s, want)
 	}
 }

 func TestProto3Text(t *testing.T) {
 	tests := []struct {
 		m    proto.Message
 		want string
 	}{
 		// zero message
 		{&proto3pb.Message{}, ``},
 		// zero message except for an empty byte slice
 		{&proto3pb.Message{Data: []byte{}}, ``},
 		// trivial case
 		{&proto3pb.Message{Name: "Rob", HeightInCm: 175}, `name:"Rob" height_in_cm:175`},
 		// empty map
 		{&pb.MessageWithMap{}, ``},
 		// non-empty map; map format is the same as a repeated struct,
 		// and they are sorted by key (numerically for numeric keys).
 		{
 			&pb.MessageWithMap{NameMapping: map[int32]string{
 				-1:      "Negatory",
 				7:       "Lucky",
 				1234:    "Feist",
 				6345789: "Otis",
 			}},
 			`name_mapping:<key:-1 value:"Negatory" > ` +
 				`name_mapping:<key:7 value:"Lucky" > ` +
 				`name_mapping:<key:1234 value:"Feist" > ` +
 				`name_mapping:<key:6345789 value:"Otis" >`,
 		},
 		// map with nil value; not well-defined, but we shouldn't crash
 		{
 			&pb.MessageWithMap{MsgMapping: map[int64]*pb.FloatingPoint{7: nil}},
 			`msg_mapping:<key:7 >`,
 		},
 	}
 	for _, test := range tests {
 		got := strings.TrimSpace(test.m.String())
 		if got != test.want {
 			t.Errorf("\n got %s\nwant %s", got, test.want)
 		}
 	}
 }
	// 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_test

	import (
	"bytes"
	"errors"
	"io/ioutil"
	"math"
	"strings"
	"testing"

	"github.com/golang/protobuf/proto"

	proto3pb "github.com/golang/protobuf/proto/proto3_proto"
	pb "github.com/golang/protobuf/proto/testdata"
	)

	// textMessage implements the methods that allow it to marshal and unmarshal
	// itself as text.
	type textMessage struct {
	}

	func (*textMessage) MarshalText() ([]byte, error) {
	return []byte("custom"), nil
	}

	func (*textMessage) UnmarshalText(bytes []byte) error {
	if string(bytes) != "custom" {
	return errors.New("expected 'custom'")
	}
	return nil
	}

	func (*textMessage) Reset() {}
	func (*textMessage) String() string { return "" }
	func (*textMessage) ProtoMessage() {}

	func newTestMessage() *pb.MyMessage {
	msg := &pb.MyMessage{
	Count: proto.Int32(42),
	Name: proto.String("Dave"),
	Quote: proto.String(`"I didn't want to go."`),
	Pet: []string{"bunny", "kitty", "horsey"},
	Inner: &pb.InnerMessage{
	Host: proto.String("footrest.syd"),
	Port: proto.Int32(7001),
	Connected: proto.Bool(true),
	},
	Others: []*pb.OtherMessage{
	{
	Key: proto.Int64(0xdeadbeef),
	Value: []byte{1, 65, 7, 12},
	},
	{
	Weight: proto.Float32(6.022),
	Inner: &pb.InnerMessage{
	Host: proto.String("lesha.mtv"),
	Port: proto.Int32(8002),
	},
	},
	},
	Bikeshed: pb.MyMessage_BLUE.Enum(),
	Somegroup: &pb.MyMessage_SomeGroup{
	GroupField: proto.Int32(8),
	},
	// One normally wouldn't do this.
	// This is an undeclared tag 13, as a varint (wire type 0) with value 4.
	XXX_unrecognized: []byte{13<<3 \| 0, 4},
	}
	ext := &pb.Ext{
	Data: proto.String("Big gobs for big rats"),
	}
	if err := proto.SetExtension(msg, pb.E_Ext_More, ext); err != nil {
	panic(err)
	}
	greetings := []string{"adg", "easy", "cow"}
	if err := proto.SetExtension(msg, pb.E_Greeting, greetings); err != nil {
	panic(err)
	}

	// Add an unknown extension. We marshal a pb.Ext, and fake the ID.
	b, err := proto.Marshal(&pb.Ext{Data: proto.String("3G skiing")})
	if err != nil {
	panic(err)
	}
	b = append(proto.EncodeVarint(201<<3\|proto.WireBytes), b...)
	proto.SetRawExtension(msg, 201, b)

	// Extensions can be plain fields, too, so let's test that.
	b = append(proto.EncodeVarint(202<<3\|proto.WireVarint), 19)
	proto.SetRawExtension(msg, 202, b)

	return msg
	}

	const text = `count: 42
	name: "Dave"
	quote: "\"I didn't want to go.\""
	pet: "bunny"
	pet: "kitty"
	pet: "horsey"
	inner: <
	host: "footrest.syd"
	port: 7001
	connected: true
	>
	others: <
	key: 3735928559
	value: "\001A\007\014"
	>
	others: <
	weight: 6.022
	inner: <
	host: "lesha.mtv"
	port: 8002
	>
	>
	bikeshed: BLUE
	SomeGroup {
	group_field: 8
	}
	/* 2 unknown bytes */
	13: 4
	[testdata.Ext.more]: <
	data: "Big gobs for big rats"
	>
	[testdata.greeting]: "adg"
	[testdata.greeting]: "easy"
	[testdata.greeting]: "cow"
	/* 13 unknown bytes */
	201: "\t3G skiing"
	/* 3 unknown bytes */
	202: 19
	`

	func TestMarshalText(t *testing.T) {
	buf := new(bytes.Buffer)
	if err := proto.MarshalText(buf, newTestMessage()); err != nil {
	t.Fatalf("proto.MarshalText: %v", err)
	}
	s := buf.String()
	if s != text {
	t.Errorf("Got:\n===\n%v===\nExpected:\n===\n%v===\n", s, text)
	}
	}

	func TestMarshalTextCustomMessage(t *testing.T) {
	buf := new(bytes.Buffer)
	if err := proto.MarshalText(buf, &textMessage{}); err != nil {
	t.Fatalf("proto.MarshalText: %v", err)
	}
	s := buf.String()
	if s != "custom" {
	t.Errorf("Got %q, expected %q", s, "custom")
	}
	}
	func TestMarshalTextNil(t *testing.T) {
	want := "<nil>"
	tests := []proto.Message{nil, (*pb.MyMessage)(nil)}
	for i, test := range tests {
	buf := new(bytes.Buffer)
	if err := proto.MarshalText(buf, test); err != nil {
	t.Fatal(err)
	}
	if got := buf.String(); got != want {
	t.Errorf("%d: got %q want %q", i, got, want)
	}
	}
	}

	func TestMarshalTextUnknownEnum(t *testing.T) {
	// The Color enum only specifies values 0-2.
	m := &pb.MyMessage{Bikeshed: pb.MyMessage_Color(3).Enum()}
	got := m.String()
	const want = `bikeshed:3 `
	if got != want {
	t.Errorf("\n got %q\nwant %q", got, want)
	}
	}

	func TestTextOneof(t *testing.T) {
	tests := []struct {
	m proto.Message
	want string
	}{
	// zero message
	{&pb.Communique{}, ``},
	// scalar field
	{&pb.Communique{Union: &pb.Communique_Number{4}}, `number:4`},
	// message field
	{&pb.Communique{Union: &pb.Communique_Msg{
	&pb.Strings{StringField: proto.String("why hello!")},
	}}, `msg:<string_field:"why hello!" >`},
	// bad oneof (should not panic)
	{&pb.Communique{Union: &pb.Communique_Msg{nil}}, `msg:/* nil */`},
	}
	for _, test := range tests {
	got := strings.TrimSpace(test.m.String())
	if got != test.want {
	t.Errorf("\n got %s\nwant %s", got, test.want)
	}
	}
	}

	func BenchmarkMarshalTextBuffered(b *testing.B) {
	buf := new(bytes.Buffer)
	m := newTestMessage()
	for i := 0; i < b.N; i++ {
	buf.Reset()
	proto.MarshalText(buf, m)
	}
	}

	func BenchmarkMarshalTextUnbuffered(b *testing.B) {
	w := ioutil.Discard
	m := newTestMessage()
	for i := 0; i < b.N; i++ {
	proto.MarshalText(w, m)
	}
	}

	func compact(src string) string {
	// s/[ \n]+/ /g; s/ $//;
	dst := make([]byte, len(src))
	space, comment := false, false
	j := 0
	for i := 0; i < len(src); i++ {
	if strings.HasPrefix(src[i:], "/*") {
	comment = true
	i++
	continue
	}
	if comment && strings.HasPrefix(src[i:], "*/") {
	comment = false
	i++
	continue
	}
	if comment {
	continue
	}
	c := src[i]
	if c == ' ' \|\| c == '\n' {
	space = true
	continue
	}
	if j > 0 && (dst[j-1] == ':' \|\| dst[j-1] == '<' \|\| dst[j-1] == '{') {
	space = false
	}
	if c == '{' {
	space = false
	}
	if space {
	dst[j] = ' '
	j++
	space = false
	}
	dst[j] = c
	j++
	}
	if space {
	dst[j] = ' '
	j++
	}
	return string(dst[0:j])
	}

	var compactText = compact(text)

	func TestCompactText(t *testing.T) {
	s := proto.CompactTextString(newTestMessage())
	if s != compactText {
	t.Errorf("Got:\n===\n%v===\nExpected:\n===\n%v\n===\n", s, compactText)
	}
	}

	func TestStringEscaping(t *testing.T) {
	testCases := []struct {
	in *pb.Strings
	out string
	}{
	{
	// Test data from C++ test (TextFormatTest.StringEscape).
	// Single divergence: we don't escape apostrophes.
	&pb.Strings{StringField: proto.String("\"A string with ' characters \n and \r newlines and \t tabs and \001 slashes \\ and multiple spaces")},
	"string_field: \"\\\"A string with ' characters \\n and \\r newlines and \\t tabs and \\001 slashes \\\\ and multiple spaces\"\n",
	},
	{
	// Test data from the same C++ test.
	&pb.Strings{StringField: proto.String("\350\260\267\346\255\214")},
	"string_field: \"\\350\\260\\267\\346\\255\\214\"\n",
	},
	{
	// Some UTF-8.
	&pb.Strings{StringField: proto.String("\x00\x01\xff\x81")},
	`string_field: "\000\001\377\201"` + "\n",
	},
	}

	for i, tc := range testCases {
	var buf bytes.Buffer
	if err := proto.MarshalText(&buf, tc.in); err != nil {
	t.Errorf("proto.MarsalText: %v", err)
	continue
	}
	s := buf.String()
	if s != tc.out {
	t.Errorf("#%d: Got:\n%s\nExpected:\n%s\n", i, s, tc.out)
	continue
	}

	// Check round-trip.
	pb := new(pb.Strings)
	if err := proto.UnmarshalText(s, pb); err != nil {
	t.Errorf("#%d: UnmarshalText: %v", i, err)
	continue
	}
	if !proto.Equal(pb, tc.in) {
	t.Errorf("#%d: Round-trip failed:\nstart: %v\n end: %v", i, tc.in, pb)
	}
	}
	}

	// A limitedWriter accepts some output before it fails.
	// This is a proxy for something like a nearly-full or imminently-failing disk,
	// or a network connection that is about to die.
	type limitedWriter struct {
	b bytes.Buffer
	limit int
	}

	var outOfSpace = errors.New("proto: insufficient space")

	func (w *limitedWriter) Write(p []byte) (n int, err error) {
	var avail = w.limit - w.b.Len()
	if avail <= 0 {
	return 0, outOfSpace
	}
	if len(p) <= avail {
	return w.b.Write(p)
	}
	n, _ = w.b.Write(p[:avail])
	return n, outOfSpace
	}

	func TestMarshalTextFailing(t *testing.T) {
	// Try lots of different sizes to exercise more error code-paths.
	for lim := 0; lim < len(text); lim++ {
	buf := new(limitedWriter)
	buf.limit = lim
	err := proto.MarshalText(buf, newTestMessage())
	// We expect a certain error, but also some partial results in the buffer.
	if err != outOfSpace {
	t.Errorf("Got:\n===\n%v===\nExpected:\n===\n%v===\n", err, outOfSpace)
	}
	s := buf.b.String()
	x := text[:buf.limit]
	if s != x {
	t.Errorf("Got:\n===\n%v===\nExpected:\n===\n%v===\n", s, x)
	}
	}
	}

	func TestFloats(t *testing.T) {
	tests := []struct {
	f float64
	want string
	}{
	{0, "0"},
	{4.7, "4.7"},
	{math.Inf(1), "inf"},
	{math.Inf(-1), "-inf"},
	{math.NaN(), "nan"},
	}
	for _, test := range tests {
	msg := &pb.FloatingPoint{F: &test.f}
	got := strings.TrimSpace(msg.String())
	want := `f:` + test.want
	if got != want {
	t.Errorf("f=%f: got %q, want %q", test.f, got, want)
	}
	}
	}

	func TestRepeatedNilText(t *testing.T) {
	m := &pb.MessageList{
	Message: []*pb.MessageList_Message{
	nil,
	&pb.MessageList_Message{
	Name: proto.String("Horse"),
	},
	nil,
	},
	}
	want := `Message <nil>
	Message {
	name: "Horse"
	}
	Message <nil>
	`
	if s := proto.MarshalTextString(m); s != want {
	t.Errorf(" got: %s\nwant: %s", s, want)
	}
	}

	func TestProto3Text(t *testing.T) {
	tests := []struct {
	m proto.Message
	want string
	}{
	// zero message
	{&proto3pb.Message{}, ``},
	// zero message except for an empty byte slice
	{&proto3pb.Message{Data: []byte{}}, ``},
	// trivial case
	{&proto3pb.Message{Name: "Rob", HeightInCm: 175}, `name:"Rob" height_in_cm:175`},
	// empty map
	{&pb.MessageWithMap{}, ``},
	// non-empty map; map format is the same as a repeated struct,
	// and they are sorted by key (numerically for numeric keys).
	{
	&pb.MessageWithMap{NameMapping: map[int32]string{
	-1: "Negatory",
	7: "Lucky",
	1234: "Feist",
	6345789: "Otis",
	}},
	`name_mapping:<key:-1 value:"Negatory" > ` +
	`name_mapping:<key:7 value:"Lucky" > ` +
	`name_mapping:<key:1234 value:"Feist" > ` +
	`name_mapping:<key:6345789 value:"Otis" >`,
	},
	// map with nil value; not well-defined, but we shouldn't crash
	{
	&pb.MessageWithMap{MsgMapping: map[int64]*pb.FloatingPoint{7: nil}},
	`msg_mapping:<key:7 >`,
	},
	}
	for _, test := range tests {
	got := strings.TrimSpace(test.m.String())
	if got != test.want {
	t.Errorf("\n got %s\nwant %s", got, test.want)
	}
	}
	}