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calling variable binded functions #259

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ghost opened this issue Mar 15, 2022 · 0 comments
Open

calling variable binded functions #259

ghost opened this issue Mar 15, 2022 · 0 comments

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@ghost
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ghost commented Mar 15, 2022

python

class Some:
    def thing(what):
        print(what)

nim

when isMainModule:
    let
        m = pyimport("test")
        oname = "Some"
        fname = "thing"
        o = m.getattr(oname)
        f = o.getattr(fname)

    f(what="nice")

Modified dotCall macro to make it work:

macro fnCall(o: untyped, args: varargs[untyped]): untyped =
  let plainArgs = newTree(nnkBracket)
  let kwArgs = newTree(nnkBracket)

  for arg in args:
    # Skip the bogus [] `args` when no argument is passed
    if arg.kind == nnkHiddenStdConv and arg[0].kind == nnkEmpty:
      continue
    elif arg.kind != nnkExprEqExpr:
      plainArgs.add(newCall("toPyObjectArgument", arg))
    else:
      expectKind(arg[0], nnkIdent)
      kwArgs.add(newTree(nnkPar,
        newCall("cstring", newLit($arg[0])),
        newCall("toPyObjectArgument", arg[1])))

  result = newCall(bindSym"newPyObjectConsumingRef",
    newCall(bindSym"callObjectAux", newcall("privateRawPyObj", o), plainArgs, kwArgs))

template `()`*(o: PyObject, args: varargs[untyped]): PyObject =
    fnCall(o, args)
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