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46 lines
1.2 KiB
Nim
46 lines
1.2 KiB
Nim
import ast
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template elementType*(T: typedesc): typedesc =
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typeof(block:
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var a: T
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for ai in a: ai)
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proc fromLit*(a: PNode, T: typedesc): auto =
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## generic PNode => type
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## see also reverse operation `toLit`
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when T is set:
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result = default(T)
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type Ti = elementType(T)
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for ai in a:
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result.incl Ti(ai.intVal)
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else:
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static: doAssert false, "not yet supported: " & $T # add as needed
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proc toLit*[T](a: T): PNode =
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## generic type => PNode
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## see also reverse operation `fromLit`
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when T is string: newStrNode(nkStrLit, a)
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elif T is Ordinal: newIntNode(nkIntLit, a.ord)
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elif T is (proc): newNode(nkNilLit)
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elif T is ref:
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if a == nil: newNode(nkNilLit)
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else: toLit(a[])
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elif T is tuple:
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result = newTree(nkTupleConstr)
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for ai in fields(a): result.add toLit(ai)
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elif T is seq:
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result = newNode(nkBracket)
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for ai in a:
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result.add toLit(ai)
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elif T is object:
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result = newTree(nkObjConstr)
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result.add(newNode(nkEmpty))
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for k, ai in fieldPairs(a):
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let reti = newNode(nkExprColonExpr)
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reti.add k.toLit
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reti.add ai.toLit
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result.add reti
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else:
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static: doAssert false, "not yet supported: " & $T # add as needed
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