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Add support for Format flavors

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Zahary Karadjov 2021-03-18 12:55:50 +02:00
parent 261de741b7
commit 84ffa54554
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GPG Key ID: C8936F8A3073D609
2 changed files with 16 additions and 5 deletions
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20
serialization.nim
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@ -14,8 +14,8 @@ template serializationFormatImpl(Name: untyped,
# mechanism of Nim will try to expand the `mimeType` param in the position # mechanism of Nim will try to expand the `mimeType` param in the position
# of the `mimeType` template name which will result in error. # of the `mimeType` template name which will result in error.
type Name* = object type Name* = object
template ReaderType*(T: type Name): type = Reader template ReaderType*(T: type Name, F: distinct type = DefaultFlavor): type = Reader[F]
template WriterType*(T: type Name): type = Writer template WriterType*(T: type Name, F: distinct type = DefaultFlavor): type = Writer[F]
template PreferedOutputType*(T: type Name): type = PreferedOutput template PreferedOutputType*(T: type Name): type = PreferedOutput
template mimeType*(T: type Name): string = mimeTypeName template mimeType*(T: type Name): string = mimeTypeName
@ -24,6 +24,13 @@ template serializationFormat*(Name: untyped,
mimeType: static string = "") = mimeType: static string = "") =
serializationFormatImpl(Name, Reader, Writer, PreferedOutput, mimeType) serializationFormatImpl(Name, Reader, Writer, PreferedOutput, mimeType)
template createFlavor*(ModifiedFormat, FlavorName: untyped) =
type FlavorName* = object
template ReaderType*(T: type FlavorName): type = ReaderType(ModifiedFormat, FlavorName)
template WriterType*(T: type FlavorName): type = WriterType(ModifiedFormat, FlavorName)
template PreferedOutputType*(T: type FlavorName): type = PreferedOutputType(ModifiedFormat)
template mimeType*(T: type FlavorName): string = mimeType(ModifiedFormat)
template encode*(Format: type, value: auto, params: varargs[untyped]): auto = template encode*(Format: type, value: auto, params: varargs[untyped]): auto =
mixin init, WriterType, writeValue, PreferedOutputType mixin init, WriterType, writeValue, PreferedOutputType
{.noSideEffect.}: {.noSideEffect.}:
@ -33,7 +40,8 @@ template encode*(Format: type, value: auto, params: varargs[untyped]): auto =
# faststreams may be writing to a file or a network device. # faststreams may be writing to a file or a network device.
try: try:
var s = memoryOutput() var s = memoryOutput()
var writer = unpackArgs(init, [WriterType(Format), s, params]) type Writer = WriterType(Format)
var writer = unpackArgs(init, [Writer, s, params])
writeValue writer, value writeValue writer, value
s.getOutput PreferedOutputType(Format) s.getOutput PreferedOutputType(Format)
except IOError: except IOError:
@ -108,7 +116,8 @@ template saveFile*(Format: type, filename: string, value: auto, params: varargs[
var stream = fileOutput(filename) var stream = fileOutput(filename)
try: try:
var writer = unpackArgs(init, [WriterType(Format), stream, params]) type Writer = WriterType(Format)
var writer = unpackArgs(init, [Writer, stream, params])
writer.writeValue(value) writer.writeValue(value)
finally: finally:
close stream close stream
@ -169,6 +178,7 @@ template writeValue*(stream: OutputStream,
value: auto, value: auto,
params: varargs[untyped]) = params: varargs[untyped]) =
mixin WriterType, init, writeValue mixin WriterType, init, writeValue
var writer = unpackArgs(init, [WriterType(Format), stream]) type Writer = WriterType(Format)
var writer = unpackArgs(init, [Writer, stream])
writeValue writer, value writeValue writer, value

1
serialization/object_serialization.nim
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@ -3,6 +3,7 @@ import
errors errors
type type
DefaultFlavor* = object
FieldTag*[RecordType; fieldName: static string; FieldType] = distinct void FieldTag*[RecordType; fieldName: static string; FieldType] = distinct void
let let