protoc-gen-go: normalize floating-point default values (#737)

Parse floating-point default values and format them with fmt.Sprint.
Eliminates a minor point of inconsistency with the v2 generator.

protoc-gen-go/generator/generator.go

@@ -1536,6 +1536,18 @@ func (g *Generator) goTag(message *Descriptor, field *descriptor.FieldDescriptor
 				g.Fail("unknown enum type", CamelCaseSlice(obj.TypeName()))
 			}
 			defaultValue = enum.integerValueAsString(defaultValue)
+		case descriptor.FieldDescriptorProto_TYPE_FLOAT:
+			if def := defaultValue; def != "inf" && def != "-inf" && def != "nan" {
+				if f, err := strconv.ParseFloat(defaultValue, 32); err == nil {
+					defaultValue = fmt.Sprint(float32(f))
+				}
+			}
+		case descriptor.FieldDescriptorProto_TYPE_DOUBLE:
+			if def := defaultValue; def != "inf" && def != "-inf" && def != "nan" {
+				if f, err := strconv.ParseFloat(defaultValue, 64); err == nil {
+					defaultValue = fmt.Sprint(f)
+				}
+			}
 		}
 		defaultValue = ",def=" + defaultValue
 	}
@@ -2235,6 +2247,14 @@ func (g *Generator) generateDefaultConstants(mc *msgCtx, topLevelFields []topLev
 				def = "float32(" + def + ")"
 			}
 			kind = "var "
+		case df.getProtoType() == descriptor.FieldDescriptorProto_TYPE_FLOAT:
+			if f, err := strconv.ParseFloat(def, 32); err == nil {
+				def = fmt.Sprint(float32(f))
+			}
+		case df.getProtoType() == descriptor.FieldDescriptorProto_TYPE_DOUBLE:
+			if f, err := strconv.ParseFloat(def, 64); err == nil {
+				def = fmt.Sprint(f)
+			}
 		case df.getProtoType() == descriptor.FieldDescriptorProto_TYPE_ENUM:
 			// Must be an enum.  Need to construct the prefixed name.
 			obj := g.ObjectNamed(df.getProtoTypeName())

protoc-gen-go/testdata/my_test/test.pb.go

@@ -207,6 +207,12 @@ type Request struct {
 	Reset_     *int32           `protobuf:"varint,12,opt,name=reset" json:"reset,omitempty"`
 	// This field should not conflict with any getters.
 	GetKey_              *string  `protobuf:"bytes,16,opt,name=get_key,json=getKey" json:"get_key,omitempty"`
+	FloatNinf            *float32 `protobuf:"fixed32,20,opt,name=float_ninf,json=floatNinf,def=-inf" json:"float_ninf,omitempty"`
+	FloatPinf            *float32 `protobuf:"fixed32,21,opt,name=float_pinf,json=floatPinf,def=inf" json:"float_pinf,omitempty"`
+	FloatExp             *float32 `protobuf:"fixed32,22,opt,name=float_exp,json=floatExp,def=1e+09" json:"float_exp,omitempty"`
+	DoubleNinf           *float64 `protobuf:"fixed64,23,opt,name=double_ninf,json=doubleNinf,def=-inf" json:"double_ninf,omitempty"`
+	DoublePinf           *float64 `protobuf:"fixed64,24,opt,name=double_pinf,json=doublePinf,def=inf" json:"double_pinf,omitempty"`
+	DoubleExp            *float64 `protobuf:"fixed64,25,opt,name=double_exp,json=doubleExp,def=1e+09" json:"double_exp,omitempty"`
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
 	XXX_unrecognized     []byte   `json:"-"`
 	XXX_sizecache        int32    `json:"-"`
@@ -240,6 +246,15 @@ var xxx_messageInfo_Request proto.InternalMessageInfo
 const Default_Request_Hat HatType = HatType_FEDORA
 
 var Default_Request_Deadline float32 = float32(math.Inf(1))
+var Default_Request_FloatNinf float32 = float32(math.Inf(-1))
+var Default_Request_FloatPinf float32 = float32(math.Inf(1))
+
+const Default_Request_FloatExp float32 = 1e+09
+
+var Default_Request_DoubleNinf float64 = math.Inf(-1)
+var Default_Request_DoublePinf float64 = math.Inf(1)
+
+const Default_Request_DoubleExp float64 = 1e+09
 
 func (m *Request) GetKey() []int64 {
 	if m != nil {
@@ -304,6 +319,48 @@ func (m *Request) GetGetKey_() string {
 	return ""
 }
 
+func (m *Request) GetFloatNinf() float32 {
+	if m != nil && m.FloatNinf != nil {
+		return *m.FloatNinf
+	}
+	return Default_Request_FloatNinf
+}
+
+func (m *Request) GetFloatPinf() float32 {
+	if m != nil && m.FloatPinf != nil {
+		return *m.FloatPinf
+	}
+	return Default_Request_FloatPinf
+}
+
+func (m *Request) GetFloatExp() float32 {
+	if m != nil && m.FloatExp != nil {
+		return *m.FloatExp
+	}
+	return Default_Request_FloatExp
+}
+
+func (m *Request) GetDoubleNinf() float64 {
+	if m != nil && m.DoubleNinf != nil {
+		return *m.DoubleNinf
+	}
+	return Default_Request_DoubleNinf
+}
+
+func (m *Request) GetDoublePinf() float64 {
+	if m != nil && m.DoublePinf != nil {
+		return *m.DoublePinf
+	}
+	return Default_Request_DoublePinf
+}
+
+func (m *Request) GetDoubleExp() float64 {
+	if m != nil && m.DoubleExp != nil {
+		return *m.DoubleExp
+	}
+	return Default_Request_DoubleExp
+}
+
 type Request_SomeGroup struct {
 	GroupField           *int32   `protobuf:"varint,9,opt,name=group_field,json=groupField" json:"group_field,omitempty"`
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
@@ -1150,70 +1207,77 @@ func init() {
 func init() { proto.RegisterFile("my_test/test.proto", fileDescriptor_2c9b60a40d5131b9) }
 
 var fileDescriptor_2c9b60a40d5131b9 = []byte{
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+	0xfc, 0xeb, 0xe7, 0x3f, 0xd0, 0x32, 0xea, 0x7b, 0xd7, 0x09, 0xd9, 0x85, 0xea, 0x30, 0xce, 0x2e,
+	0x27, 0x5c, 0x47, 0xdb, 0xf1, 0x8c, 0x86, 0x31, 0x8b, 0x06, 0xda, 0x80, 0xe1, 0x9e, 0xcc, 0x61,
+	0x18, 0xcf, 0x45, 0x98, 0xb5, 0x84, 0xc2, 0x80, 0x4f, 0x61, 0x26, 0x61, 0xc4, 0xcf, 0x11, 0x04,
+	0x07, 0xcf, 0x3f, 0x3d, 0xb4, 0xa2, 0xad, 0xbd, 0xeb, 0xa4, 0xf6, 0x0d, 0x54, 0xe6, 0x45, 0x23,
+	0x8f, 0xa0, 0x8a, 0x25, 0xf3, 0x47, 0x21, 0x9f, 0x0c, 0xdd, 0x0a, 0xa6, 0x09, 0x50, 0x75, 0xac,
+	0x34, 0xb5, 0x97, 0xe0, 0xdc, 0xaf, 0xd2, 0xa2, 0x43, 0x15, 0x18, 0x3b, 0x74, 0x0b, 0xec, 0xdf,
+	0xd8, 0x24, 0xe3, 0xae, 0x89, 0xf9, 0xd4, 0x42, 0xdb, 0x7c, 0x61, 0xd4, 0xce, 0x60, 0xf3, 0x5e,
+	0x81, 0x96, 0xdd, 0x89, 0x76, 0x7f, 0xb2, 0xec, 0x5e, 0x6d, 0x6d, 0x2c, 0xd5, 0x38, 0x99, 0xe4,
+	0x4b, 0x74, 0xf5, 0x5d, 0xb0, 0xb1, 0xdd, 0x49, 0x09, 0x2c, 0xda, 0xeb, 0x3a, 0x6b, 0xa4, 0x02,
+	0xf6, 0x6b, 0xda, 0xeb, 0xf5, 0x1d, 0x83, 0x94, 0xa1, 0xd0, 0x39, 0x7d, 0xdf, 0x73, 0xcc, 0xfa,
+	0x1f, 0x26, 0xd8, 0xe8, 0x4b, 0xf6, 0xc0, 0x1e, 0xc5, 0x59, 0x34, 0xc4, 0xf3, 0x54, 0x6d, 0x6d,
+	0xdd, 0xa5, 0x6e, 0xea, 0x96, 0xd1, 0x10, 0xb2, 0x0b, 0xeb, 0x83, 0x58, 0x24, 0x6c, 0x80, 0xbd,
+	0x91, 0xba, 0xa6, 0x67, 0x35, 0xec, 0x8e, 0xe9, 0x18, 0xb4, 0x3a, 0xd3, 0xbf, 0xe5, 0x79, 0x5a,
+	0xfb, 0xd3, 0x00, 0x5b, 0xef, 0xa4, 0x0b, 0x8f, 0xae, 0x78, 0xee, 0xcb, 0xb1, 0x6a, 0x19, 0xce,
+	0x87, 0xa9, 0x7f, 0xd0, 0xfa, 0xf6, 0xbb, 0x01, 0x13, 0x7c, 0xe2, 0x1f, 0xb1, 0xf4, 0x4d, 0x14,
+	0xb8, 0x86, 0x67, 0x36, 0x2c, 0xfa, 0xc5, 0x15, 0xcf, 0x2f, 0xc6, 0x4c, 0xf6, 0x15, 0x68, 0x8e,
+	0xd1, 0x10, 0xb2, 0xb3, 0xbc, 0x7b, 0xab, 0x6d, 0x7c, 0x3f, 0xdb, 0x30, 0xf9, 0x0a, 0x1c, 0x5f,
+	0xe4, 0xba, 0x34, 0x3e, 0x1e, 0xa8, 0x16, 0x0e, 0x01, 0x8b, 0xae, 0x9f, 0xe5, 0x58, 0x1e, 0x55,
+	0x9a, 0x56, 0xdd, 0x83, 0xc2, 0x6b, 0x26, 0x38, 0x59, 0x87, 0xf2, 0xf1, 0xf9, 0xf9, 0x45, 0xe7,
+	0xf0, 0xf4, 0xd4, 0x31, 0x08, 0x40, 0xf1, 0xa2, 0xd7, 0xef, 0xbf, 0x79, 0xe7, 0x98, 0x7b, 0xe5,
+	0xf2, 0xd0, 0xb9, 0xb9, 0xb9, 0xb9, 0x31, 0xeb, 0x4f, 0xa1, 0x72, 0x2e, 0xc7, 0x7c, 0xda, 0x61,
+	0x29, 0x27, 0x04, 0x0a, 0x8a, 0x16, 0x4b, 0x51, 0xa1, 0xf8, 0xbd, 0x04, 0xfd, 0xcb, 0x80, 0x4d,
+	0xcc, 0x52, 0xef, 0x5a, 0xf2, 0x28, 0x0d, 0xe3, 0x28, 0x6d, 0xd5, 0xa1, 0x20, 0x43, 0xc1, 0xc9,
+	0xbd, 0x12, 0xb9, 0x5c, 0x75, 0x1c, 0x45, 0x5b, 0xeb, 0x15, 0x14, 0x07, 0x6c, 0x3a, 0x8d, 0xe5,
+	0x0a, 0x2a, 0xc4, 0xf2, 0xba, 0x77, 0xb5, 0x0b, 0x76, 0x3a, 0xf3, 0x6b, 0x75, 0xc0, 0x1e, 0xc6,
+	0x51, 0x26, 0x09, 0x99, 0x43, 0xe7, 0x8b, 0xc6, 0x50, 0xff, 0x45, 0xa2, 0x5d, 0xeb, 0x0d, 0xd8,
+	0x42, 0x9f, 0x7b, 0xe6, 0xd5, 0xe6, 0xad, 0xbb, 0x50, 0x3e, 0x9f, 0x0c, 0x11, 0x87, 0xbb, 0xbf,
+	0xbd, 0xbd, 0xbd, 0x2d, 0xb5, 0xcd, 0xb2, 0x51, 0xff, 0xdd, 0x02, 0x38, 0x8a, 0x85, 0xc8, 0xa2,
+	0xf0, 0x63, 0xc6, 0xc9, 0x43, 0xa8, 0x0a, 0x76, 0xc5, 0x7d, 0xc1, 0xfd, 0xc1, 0x54, 0x53, 0x94,
+	0x69, 0x45, 0xa9, 0xce, 0xf8, 0xd1, 0x34, 0x27, 0x2e, 0x14, 0xa3, 0x4c, 0x5c, 0xf2, 0xa9, 0x6b,
+	0x2b, 0xf6, 0x93, 0x35, 0x3a, 0x93, 0xc9, 0xd6, 0x2c, 0xd1, 0x45, 0x95, 0xe8, 0x93, 0x35, 0x9d,
+	0x6a, 0xa5, 0x1d, 0x32, 0xc9, 0x70, 0xfa, 0xae, 0x2b, 0xad, 0x92, 0xc8, 0x0e, 0x14, 0x25, 0x17,
+	0x89, 0x3f, 0xc0, 0x99, 0x6b, 0x9c, 0xac, 0x51, 0x5b, 0xc9, 0x47, 0x8a, 0x7e, 0xcc, 0xc3, 0x60,
+	0x2c, 0xf1, 0x98, 0x9a, 0x8a, 0x5e, 0xcb, 0x64, 0x17, 0x6c, 0x19, 0x0f, 0x59, 0xee, 0x02, 0x0e,
+	0xfe, 0xff, 0xcd, 0x73, 0xd3, 0x65, 0x79, 0x8a, 0x04, 0xca, 0x4a, 0xb6, 0xc1, 0x16, 0x2c, 0xbf,
+	0xe4, 0x6e, 0x55, 0xad, 0x5c, 0xe9, 0x51, 0x54, 0xfa, 0x21, 0x9f, 0x48, 0x86, 0x53, 0xf2, 0xff,
+	0x4a, 0x8f, 0x22, 0xa9, 0x83, 0x25, 0xd2, 0x00, 0x67, 0xe4, 0xca, 0xa1, 0x3c, 0x59, 0xa3, 0xca,
+	0x48, 0x7e, 0x5a, 0xbe, 0x24, 0x36, 0xf0, 0x92, 0x78, 0x30, 0x47, 0x2e, 0x72, 0xb7, 0xb8, 0x27,
+	0x4e, 0xd6, 0x96, 0x6e, 0x8a, 0xda, 0xe3, 0xe5, 0x61, 0xb4, 0x0d, 0x45, 0xc1, 0x31, 0x7f, 0x9b,
+	0x7a, 0x2c, 0x6b, 0xa9, 0x56, 0x02, 0xbb, 0xab, 0x16, 0xd4, 0x29, 0x81, 0x9d, 0x45, 0x61, 0x1c,
+	0xed, 0x3d, 0x84, 0xd2, 0xec, 0x4e, 0x53, 0x6d, 0xae, 0x6f, 0x35, 0xc7, 0x50, 0x43, 0xe1, 0xb8,
+	0xf7, 0xc1, 0x31, 0xf7, 0x9a, 0x50, 0x50, 0x5b, 0x57, 0xc6, 0xb3, 0xf3, 0x7e, 0xf7, 0xf0, 0x17,
+	0xc7, 0x20, 0x55, 0x28, 0x5d, 0xbc, 0xef, 0xbd, 0x53, 0x82, 0xa9, 0xa6, 0xc6, 0xe9, 0xfb, 0x7e,
+	0xf7, 0x8d, 0x63, 0xd4, 0x4c, 0xc7, 0x68, 0x7b, 0x60, 0x49, 0x16, 0xac, 0xf4, 0x6b, 0x80, 0xcb,
+	0x50, 0xa6, 0xf6, 0xd1, 0xa7, 0x96, 0xbc, 0x8f, 0xf9, 0x15, 0xb3, 0xf3, 0xe0, 0x6e, 0xa3, 0xfe,
+	0x7b, 0x4f, 0x76, 0x5e, 0x7d, 0x78, 0x19, 0x84, 0x72, 0x9c, 0x5d, 0x36, 0x07, 0xb1, 0xd8, 0x0f,
+	0xe2, 0x09, 0x8b, 0x82, 0x7d, 0xfc, 0x03, 0xb8, 0xcc, 0x46, 0xfa, 0x63, 0xf0, 0x2c, 0xe0, 0xd1,
+	0xb3, 0x20, 0xc6, 0x5f, 0x07, 0xd5, 0x0f, 0xfb, 0xb3, 0x7f, 0x89, 0x1f, 0xd5, 0xeb, 0x9f, 0x00,
+	0x00, 0x00, 0xff, 0xff, 0x31, 0xff, 0x4e, 0x30, 0x5a, 0x08, 0x00, 0x00,
 }

protoc-gen-go/testdata/my_test/test.proto

@@ -85,6 +85,13 @@ message Request {
   optional int32 reset = 12;
   // This field should not conflict with any getters.
   optional string get_key = 16;
+
+  optional float float_ninf = 20 [default=-inf];
+  optional float float_pinf = 21 [default=inf];
+  optional float float_exp = 22 [default=1e9];
+  optional double double_ninf = 23 [default=-inf];
+  optional double double_pinf = 24 [default=inf];
+  optional double double_exp = 25 [default=1e9];
 }
 
 message Reply {