73 lines
2.2 KiB
Nim
73 lines
2.2 KiB
Nim
# SPDX-FileCopyrightText: 2021 ☭ Emery Hemingway
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# SPDX-License-Identifier: ISC
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import std/[json, tables]
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import preserves
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proc toPreserveHook*(js: JsonNode): Preserve =
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case js.kind
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of JString:
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result = Preserve(kind: pkString, string: js.str)
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of JInt:
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result = Preserve(kind: pkSignedInteger, int: js.num)
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of JFloat:
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result = Preserve(kind: pkDouble, double: js.fnum)
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of JBool:
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result = case js.bval
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of false: symbol"false"
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of true: symbol"true"
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of JNull:
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result = symbol"null"
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of JObject:
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result = Preserve(kind: pkDictionary)
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for key, val in js.fields.pairs:
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result.dict[Preserve(kind: pkString, string: key)] = toPreserveHook(val)
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of JArray:
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result = Preserve(kind: pkSequence,
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sequence: newSeq[Preserve](js.elems.len))
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for i, e in js.elems:
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result.sequence[i] = toPreserveHook(e)
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proc toJsonHook*(prs: Preserve): JsonNode =
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case prs.kind:
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of pkBoolean:
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result = newJBool(prs.bool)
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of pkFloat:
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result = newJFloat(prs.float)
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of pkDouble:
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result = newJFloat(prs.double)
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of pkSignedInteger:
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result = newJInt(prs.int)
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of pkBigInteger:
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raise newException(ValueError, "cannot convert big integer to JSON")
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of pkString:
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result = newJString(prs.string)
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of pkByteString:
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raise newException(ValueError, "cannot convert bytes to JSON")
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of pkSymbol:
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case prs.symbol
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of "false":
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result = newJBool(false)
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of "true":
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result = newJBool(true)
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of "null":
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result = newJNull()
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else:
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raise newException(ValueError, "cannot convert symbol to JSON")
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of pkRecord:
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raise newException(ValueError, "cannot convert record to JSON")
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of pkSequence:
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result = newJArray()
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for val in prs.sequence:
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result.add(toJsonHook(val))
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of pkSet:
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raise newException(ValueError, "cannot convert set to JSON")
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of pkDictionary:
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result = newJObject()
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for (key, val) in prs.dict.pairs:
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if key.kind != pkString:
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raise newException(ValueError, "cannot convert non-string dictionary key to JSON")
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result[key.string] = toJsonHook(val)
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of pkEmbedded:
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raise newException(ValueError, "cannot convert embedded value to JSON")
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