/
oneof.go
134 lines (112 loc) · 3.54 KB
/
oneof.go
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package main
import "github.com/golang/protobuf/protoc-gen-go/descriptor"
func (fg *FileGenerator) GenerateOneofDefinition(prefix string, inMessage *descriptor.DescriptorProto, oneofIndex int) error {
inOneof := inMessage.GetOneofDecl()[oneofIndex]
// TODO: Prefix with message name to avoid collisions.
oneofType := oneofType(inOneof)
fg.P("")
fg.P("")
fg.P("type %s", oneofType)
{
fg.In()
leading := "="
{
oneofVariantName := oneofUnspecifiedValue(inOneof)
fg.P("%s %s", leading, oneofVariantName)
leading = "|"
}
for _, inField := range inMessage.GetField() {
if inField.OneofIndex != nil && inField.GetOneofIndex() == int32(oneofIndex) {
oneofVariantName := elmTypeName(inField.GetName())
oneofArgumentType := fieldElmType(inField)
fg.P("%s %s %s", leading, oneofVariantName, oneofArgumentType)
leading = "|"
}
}
fg.Out()
}
return nil
}
func (fg *FileGenerator) GenerateOneofDecoder(prefix string, inMessage *descriptor.DescriptorProto, oneofIndex int) error {
inOneof := inMessage.GetOneofDecl()[oneofIndex]
// TODO: Prefix with message name to avoid collisions.
oneofType := oneofType(inOneof)
decoderName := oneofDecoderName(inOneof)
fg.P("")
fg.P("")
fg.P("%s : JD.Decoder %s", decoderName, oneofType)
fg.P("%s =", decoderName)
{
fg.In()
fg.P("JD.lazy <| \\_ -> JD.oneOf")
{
fg.In()
leading := "["
for _, inField := range inMessage.GetField() {
if inField.OneofIndex != nil && inField.GetOneofIndex() == int32(oneofIndex) {
oneofVariantName := elmTypeName(inField.GetName())
decoderName := fieldDecoderName(inField)
fg.P("%s JD.map %s (JD.field %q %s)", leading, oneofVariantName, inField.GetJsonName(), decoderName)
leading = ","
}
}
fg.P("%s JD.succeed %s", leading, oneofUnspecifiedValue(inOneof))
fg.P("]")
fg.Out()
}
fg.Out()
}
return nil
}
func (fg *FileGenerator) GenerateOneofEncoder(prefix string, inMessage *descriptor.DescriptorProto, oneofIndex int) error {
inOneof := inMessage.GetOneofDecl()[oneofIndex]
// TODO: Prefix with message name to avoid collisions.
oneofType := oneofType(inOneof)
encoderName := oneofEncoderName(inOneof)
argName := "v"
fg.P("")
fg.P("")
fg.P("%s : %s -> Maybe ( String, JE.Value )", encoderName, oneofType)
fg.P("%s %s =", encoderName, argName)
{
fg.In()
fg.P("case %s of", argName)
{
fg.In()
valueName := "x"
{
oneofVariantName := oneofUnspecifiedValue(inOneof)
fg.P("%s -> Nothing", oneofVariantName)
}
// TODO: Evaluate them in reverse order, as per
// https://developers.google.com/protocol-buffers/docs/proto3#oneof
for _, inField := range inMessage.GetField() {
if inField.OneofIndex != nil && inField.GetOneofIndex() == int32(oneofIndex) {
oneofVariantName := elmTypeName(inField.GetName())
e := fieldEncoderName(inField)
fg.P("%s %s ->", oneofVariantName, valueName)
fg.In()
fg.P("Just ( %q, %s %s )", inField.GetJsonName(), e, valueName)
fg.Out()
}
}
fg.Out()
}
fg.Out()
}
return nil
}
func oneofDecoderName(inOneof *descriptor.OneofDescriptorProto) string {
typeName := elmTypeName(inOneof.GetName())
return decoderName(typeName)
}
func oneofEncoderName(inOneof *descriptor.OneofDescriptorProto) string {
typeName := elmTypeName(inOneof.GetName())
return encoderName(typeName)
}
func oneofType(inOneof *descriptor.OneofDescriptorProto) string {
return elmTypeName(inOneof.GetName())
}
func oneofUnspecifiedValue(inOneof *descriptor.OneofDescriptorProto) string {
return elmTypeName(inOneof.GetName() + "_unspecified")
}