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42 lines
1.2 KiB
Nim
42 lines
1.2 KiB
Nim
# json-serialization
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# Copyright (c) 2019-2023 Status Research & Development GmbH
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# Licensed under either of
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
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# * MIT license ([LICENSE-MIT](LICENSE-MIT))
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# at your option.
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# This file may not be copied, modified, or distributed except according to
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# those terms.
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import std/options, ../../json_serialization/[reader, writer, lexer]
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export options
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template writeObjectField*(w: var JsonWriter,
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record: auto,
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fieldName: static string,
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field: Option): bool =
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mixin writeObjectField
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if field.isSome:
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writeObjectField(w, record, fieldName, field.get)
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else:
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false
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proc writeValue*(writer: var JsonWriter, value: Option) {.raises: [IOError].} =
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mixin writeValue, flavorOmitsOptionalFields
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type Flavor = JsonWriter.Flavor
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if value.isSome:
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writer.writeValue value.get
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elif not flavorOmitsOptionalFields(Flavor):
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writer.writeValue JsonString("null")
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proc readValue*[T](reader: var JsonReader, value: var Option[T]) =
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mixin readValue
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let tok = reader.lexer.lazyTok
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if tok == tkNull:
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reset value
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reader.lexer.next()
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else:
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value = some reader.readValue(T)
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