feat(EXT), Lib/typing: OptionalObj

Author: litlighilit

src/pylib/Lib/typing_impl/optional_obj.nim

@@ -0,0 +1,27 @@
+import std/options
+import ../../noneType
+type
+  OptionalObj*[T] = distinct Option[T]
+
+using self: OptionalObj
+template wrap(meth){.dirty.} =
+  proc meth*[T](self: OptionalObj[T]): bool = Option[T](self).meth
+wrap isSome
+wrap isNone
+
+proc `is`*(self; _: NoneType): bool = self.isNone
+proc `==`*(self; _: NoneType): bool = self.isNone
+
+converter unsafeGet*[T](self: OptionalObj[T]): T =
+  assert self.isSome, self.repr & " cannot be None"
+  Option[T](self).unsafeGet
+
+
+converter unsafeToNone*[T](self: OptionalObj[T]): NoneType =
+  assert self.isNone
+
+proc newOptionalObj*[T](x: T): OptionalObj[T] = OptionalObj[T] some(x)
+proc newOptionalObj*[T](): OptionalObj[T] = OptionalObj[T] none[T]()
+
+template expOptObjCvt* =
+  export optional_obj except newOptionalObj, isSome, isNone, OptionalObj

src/pylib/Lib/typing_impl/str_optional_obj.nim

@@ -0,0 +1,9 @@
+
+import ./optional_obj
+export optional_obj
+import ../../pystring/strimpl
+export strimpl
+
+proc newStrOptionalObj*(x: string): OptionalObj[PyStr] =
+  if x.len == 0: newOptionalObj[PyStr]()
+  else: newOptionalObj[PyStr](str x)