Golang descriptor.FieldDescriptorProto類代碼示例

func (g *validation) generateRequiredTest(msg *generator.Descriptor, field *pb.FieldDescriptorProto, fieldName string) {

	if field.IsRepeated() {
		g.P(`if `, fieldName, ` == nil || len(`, fieldName, `) == 0 {`)
		g.P(`return `, g.errorsPkg.Use(), `.NotValidf("`, field.Name, ` is required")`)
		g.P(`}`)
		return
	}

	switch field.GetType() {
	case pb.FieldDescriptorProto_TYPE_BYTES:
		g.P(`if `, fieldName, ` == nil || len(`, fieldName, `) == 0 {`)
		g.P(`return `, g.errorsPkg.Use(), `.NotValidf("`, field.Name, ` is required")`)
		g.P(`}`)
	case pb.FieldDescriptorProto_TYPE_STRING:
		g.P(`if `, fieldName, ` == "" {`)
		g.P(`return `, g.errorsPkg.Use(), `.NotValidf("`, field.Name, ` is required")`)
		g.P(`}`)
	case pb.FieldDescriptorProto_TYPE_MESSAGE:
		if gogoproto.IsNullable(field) {
			g.P(`if `, fieldName, ` == nil {`)
			g.P(`return `, g.errorsPkg.Use(), `.NotValidf("`, field.Name, ` is required")`)
			g.P(`}`)
		}
	}

}

func (p *plugin) hasLoop(field *descriptor.FieldDescriptorProto, visited []*generator.Descriptor, excludes []*generator.Descriptor) *generator.Descriptor {
	if field.IsMessage() || p.IsGroup(field) || p.IsMap(field) {
		var fieldMessage *generator.Descriptor
		if p.IsMap(field) {
			m := p.GoMapType(nil, field)
			if !m.ValueField.IsMessage() {
				return nil
			}
			fieldMessage = p.ObjectNamed(m.ValueField.GetTypeName()).(*generator.Descriptor)
		} else {
			fieldMessage = p.ObjectNamed(field.GetTypeName()).(*generator.Descriptor)
		}
		fieldTypeName := generator.CamelCaseSlice(fieldMessage.TypeName())
		for _, message := range visited {
			messageTypeName := generator.CamelCaseSlice(message.TypeName())
			if fieldTypeName == messageTypeName {
				for _, e := range excludes {
					if fieldTypeName == generator.CamelCaseSlice(e.TypeName()) {
						return nil
					}
				}
				return fieldMessage
			}
		}
		for _, f := range fieldMessage.Field {
			visited = append(visited, fieldMessage)
			loopTo := p.hasLoop(f, visited, excludes)
			if loopTo != nil {
				return loopTo
			}
		}
	}
	return nil
}

func (g *validation) generateTests(msg *generator.Descriptor, field *pb.FieldDescriptorProto, fieldName string, idx int, patterns map[string]string) {

	if limbo.IsRequiredProperty(field) {
		g.generateRequiredTest(msg, field, fieldName)
	}

	if n, ok := limbo.GetMinItems(field); ok {
		g.generateMinItemsTest(msg, field, fieldName, int(n))
	}

	if n, ok := limbo.GetMaxItems(field); ok {
		g.generateMaxItemsTest(msg, field, fieldName, int(n))
	}

	if pattern, ok := limbo.GetPattern(field); ok {
		patternVar := fmt.Sprintf("valPattern_%s_%d", msg.GetName(), idx)
		patterns[patternVar] = pattern
		g.generatePatternTest(msg, field, fieldName, pattern, patternVar)
	}

	if n, ok := limbo.GetMinLength(field); ok {
		g.generateMinLengthTest(msg, field, fieldName, int(n))
	}

	if n, ok := limbo.GetMaxLength(field); ok {
		g.generateMaxLengthTest(msg, field, fieldName, int(n))
	}

	if field.GetType() == pb.FieldDescriptorProto_TYPE_MESSAGE {
		g.generateSubMessageTest(msg, field, fieldName)
	}

}

func getJSONName(field *pb.FieldDescriptorProto) string {
	name := field.GetJsonName()
	if name == "" {
		name = field.GetName()
	}
	return name
}

func IsRequiredProperty(field *pb.FieldDescriptorProto) bool {
	if field.Options != nil && proto.HasExtension(field.Options, E_Required) {
		return proto.GetBoolExtension(field.Options, E_Required, false)
	}
	if field.IsRequired() {
		return true
	}
	return false
}

func TurnOffNullableForNativeTypesWithoutDefaultsOnly(field *descriptor.FieldDescriptorProto) {
	if field.IsRepeated() || field.IsMessage() {
		return
	}
	if field.DefaultValue != nil {
		return
	}
	SetBoolFieldOption(gogoproto.E_Nullable, false)(field)
}

func (g *validation) generateSubMessageTest(msg *generator.Descriptor, field *pb.FieldDescriptorProto, fieldName string) {

	var casttyp = "value"
	var typ = g.gen.TypeName(g.gen.ObjectNamed(field.GetTypeName()))
	var zeroValuer = "value"
	if gogoproto.IsCastType(field) {
		if gogoproto.IsNullable(field) {
			casttyp = "((*" + typ + ")(" + casttyp + "))"
		} else {
			casttyp = "((*" + typ + ")(&" + casttyp + "))"
			zeroValuer = "((" + typ + ")(value))"
		}
	}

	if g.gen.IsMap(field) {
		// g.gen.GetMapKeyField(field*descriptor.FieldDescriptorProto, keyField*descriptor.FieldDescriptorProto)

	} else if field.IsRepeated() {
		g.P(`for _, value :=range `, fieldName, `{`)
		if gogoproto.IsNullable(field) {
			g.P(`if value != nil {`)
			g.P(`if err := `, casttyp, `.Validate(); err != nil {`)
			g.P(`return `, g.errorsPkg.Use(), `.Trace(err)`)
			g.P(`}`)
			g.P(`}`)
		} else {
			g.P(`if (`, typ, `{}) != `, zeroValuer, ` {`)
			g.P(`if err := `, casttyp, `.Validate(); err != nil {`)
			g.P(`return `, g.errorsPkg.Use(), `.Trace(err)`)
			g.P(`}`)
			g.P(`}`)
		}
		g.P(`}`)
	} else {
		if gogoproto.IsNullable(field) {
			g.P(`{`)
			g.P(`value := `, fieldName)
			g.P(`if value != nil {`)
			g.P(`if err := `, casttyp, `.Validate(); err != nil {`)
			g.P(`return `, g.errorsPkg.Use(), `.Trace(err)`)
			g.P(`}`)
			g.P(`}`)
			g.P(`}`)
		} else {
			g.P(`{`)
			g.P(`value := `, fieldName)
			g.P(`if (`, typ, `{}) != `, zeroValuer, ` {`)
			g.P(`if err := `, casttyp, `.Validate(); err != nil {`)
			g.P(`return `, g.errorsPkg.Use(), `.Trace(err)`)
			g.P(`}`)
			g.P(`}`)
			g.P(`}`)
		}
	}

}

func NeedsNilCheck(proto3 bool, field *google_protobuf.FieldDescriptorProto) bool {
	nullable := IsNullable(field)
	if field.IsMessage() || IsCustomType(field) {
		return nullable
	}
	if proto3 {
		return false
	}
	return nullable || *field.Type == google_protobuf.FieldDescriptorProto_TYPE_BYTES
}

func (g *validation) generateMaxItemsTest(msg *generator.Descriptor, field *pb.FieldDescriptorProto, fieldName string, maxItems int) {

	if !field.IsRepeated() {
		g.gen.Fail("limbo.maxItems can only be used on repeated fields.")
	}

	g.P(`if len(`, fieldName, `) < `, maxItems, ` {`)
	g.P(`return `, g.errorsPkg.Use(), `.NotValidf("number of items in `, field.Name, ` (%q) is to small (maximum: `, maxItems, `)", len(`, fieldName, `))`)
	g.P(`}`)
}

func (g *Generator) IsMap(field *descriptor.FieldDescriptorProto) bool {
	if !field.IsMessage() {
		return false
	}
	byName := g.ObjectNamed(field.GetTypeName())
	desc, ok := byName.(*Descriptor)
	if byName == nil || !ok || !desc.GetOptions().GetMapEntry() {
		return false
	}
	return true
}

func (p *plugin) getEnumVal(field *descriptor.FieldDescriptorProto, goTyp string) string {
	enum := p.ObjectNamed(field.GetTypeName()).(*generator.EnumDescriptor)
	l := len(enum.Value)
	values := make([]string, l)
	for i := range enum.Value {
		values[i] = strconv.Itoa(int(*enum.Value[i].Number))
	}
	arr := "[]int32{" + strings.Join(values, ",") + "}"
	val := strings.Join([]string{generator.GoTypeToName(goTyp), `(`, arr, `[r.Intn(`, fmt.Sprintf("%d", l), `)])`}, "")
	return val
}

// GoMapValueTypes returns the map value Go type and the alias map value Go type (for casting), taking into
// account whether the map is nullable or the value is a message.
func GoMapValueTypes(mapField, valueField *descriptor.FieldDescriptorProto, goValueType, goValueAliasType string) (nullable bool, outGoType string, outGoAliasType string) {
	nullable = gogoproto.IsNullable(mapField) && valueField.IsMessage()
	if nullable {
		// ensure the non-aliased Go value type is a pointer for consistency
		if strings.HasPrefix(goValueType, "*") {
			outGoType = goValueType
		} else {
			outGoType = "*" + goValueType
		}
		outGoAliasType = goValueAliasType
	} else {
		outGoType = strings.Replace(goValueType, "*", "", 1)
		outGoAliasType = strings.Replace(goValueAliasType, "*", "", 1)
	}
	return
}

func (g *validation) generateMaxLengthTest(msg *generator.Descriptor, field *pb.FieldDescriptorProto, fieldName string, maxLength int) {

	if field.GetType() != pb.FieldDescriptorProto_TYPE_STRING {
		g.gen.Fail("limbo.maxLength can only be used on string fields.")
	}

	if field.IsRepeated() {
		g.P(`for idx, value :=range `, fieldName, `{`)
		g.P(`if len(value) > `, maxLength, ` {`)
		g.P(`return `, g.errorsPkg.Use(), `.NotValidf("`, field.Name, `[%d] (%q) is to long (maximum length: `, maxLength, `)", idx, value)`)
		g.P(`}`)
		g.P(`}`)
		return
	}

	g.P(`if len(`, fieldName, `) > `, maxLength, ` {`)
	g.P(`return `, g.errorsPkg.Use(), `.NotValidf("`, field.Name, ` (%q) is to long (maximum length: `, maxLength, `)", `, fieldName, `)`)
	g.P(`}`)

}

func (g *validation) generatePatternTest(msg *generator.Descriptor, field *pb.FieldDescriptorProto, fieldName string, pattern, patternVar string) {

	if field.GetType() != pb.FieldDescriptorProto_TYPE_STRING {
		g.gen.Fail("limbo.pattern can only be used on string fields.")
	}

	if field.IsRepeated() {
		g.P(`for idx, value :=range `, fieldName, `{`)
		g.P(`if !`, patternVar, `.MatchString(value) {`)
		g.P(`return `, g.errorsPkg.Use(), `.NotValidf("`, field.Name, `[%d] (%q) does not match pattern %s", idx, value, `, strconv.Quote(pattern), `)`)
		g.P(`}`)
		g.P(`}`)
		return
	}

	g.P(`if !`, patternVar, `.MatchString(`, fieldName, `) {`)
	g.P(`return `, g.errorsPkg.Use(), `.NotValidf("`, field.Name, ` (%q) does not match pattern %s", `, fieldName, `, `, strconv.Quote(pattern), `)`)
	g.P(`}`)

}

func (g *Generator) GetMapKeyField(field, keyField *descriptor.FieldDescriptorProto) *descriptor.FieldDescriptorProto {
	if !gogoproto.IsCastKey(field) {
		return keyField
	}
	keyField = proto.Clone(keyField).(*descriptor.FieldDescriptorProto)
	if keyField.Options == nil {
		keyField.Options = &descriptor.FieldOptions{}
	}
	keyType := gogoproto.GetCastKey(field)
	if err := proto.SetExtension(keyField.Options, gogoproto.E_Casttype, &keyType); err != nil {
		g.Fail(err.Error())
	}
	return keyField
}