53 lines
1.4 KiB
Nim
53 lines
1.4 KiB
Nim
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import
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typetraits, options, tables,
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serialization,
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./utils
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type
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EnvvarWriter* = object
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prefix: string
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key: seq[string]
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proc init*(T: type EnvvarWriter, prefix: string): T =
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result.prefix = prefix
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proc writeValue*(w: var EnvvarWriter, value: auto) =
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mixin enumInstanceSerializedFields, writeValue, writeFieldIMPL
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# TODO: reduce allocation
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when value is (SomePrimitives or range or string):
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let key = constructKey(w.prefix, w.key)
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setValue(key, value)
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elif value is Option:
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if value.isSome:
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w.writeValue value.get
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elif value is (seq or array or openArray):
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when uTypeIsPrimitives(type value):
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let key = constructKey(w.prefix, w.key)
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setValue(key, value)
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elif uTypeIsRecord(type value):
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let key = w.key[^1]
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for i in 0..<value.len:
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w.key[^1] = key & $i
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w.writeValue(value[i])
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else:
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const typeName = typetraits.name(value.type)
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{.fatal: "Failed to convert to Envvar array an unsupported type: " & typeName.}
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elif value is (object or tuple):
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type RecordType = type value
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w.key.add ""
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value.enumInstanceSerializedFields(fieldName, field):
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type FieldType = type field
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w.key[^1] = fieldName
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w.writeFieldIMPL(FieldTag[RecordType, fieldName, FieldType], field, value)
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discard w.key.pop()
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else:
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const typeName = typetraits.name(value.type)
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{.fatal: "Failed to convert to Envvar an unsupported type: " & typeName.}
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