73 lines
1.9 KiB
Nim
73 lines
1.9 KiB
Nim
# SPDX-FileCopyrightText: 2021 ☭ Emery Hemingway
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# SPDX-License-Identifier: Unlicense
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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[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 fromPreserveHook*(js: var JsonNode; prs: Preserve): bool =
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case prs.kind:
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of pkBoolean:
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js = newJBool(prs.bool)
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of pkFloat:
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js = newJFloat(prs.float)
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of pkDouble:
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js = newJFloat(prs.double)
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of pkSignedInteger:
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js = newJInt(prs.int)
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of pkString:
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js = newJString(prs.string)
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of pkSymbol:
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case prs.symbol
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of "false":
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js = newJBool(false)
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of "true":
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js = newJBool(true)
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of "null":
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js = newJNull()
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else:
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return false
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of pkSequence:
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js = newJArray()
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js.elems.setLen(prs.sequence.len)
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for i, val in prs.sequence:
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if not fromPreserve(js.elems[i], val):
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return false
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of pkDictionary:
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js = newJObject()
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for (key, val) in prs.dict.items:
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if key.kind != pkString:
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return false
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var jsVal: JsonNode
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if not fromPreserve(jsVal, val): return false
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js[key.string] = jsVal
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else: return false
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true
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proc toJsonHook*(pr: Preserve): JsonNode =
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if not fromPreserve(result, pr):
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raise newException(ValueError, "cannot convert Preserves value to JSON")
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