Add GCursor and KLens types for traversing data with history
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…rade cats and scala-js.
beezee
reviewed
Sep 25, 2020
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| implicit def eqCursorHistory[A]: Eq[CursorHistory[A]] = |
beezee
reviewed
Sep 25, 2020
| * @tparam NewValue The type of the new value | ||
| * @param NewFocus The type of the new focus | ||
| */ | ||
| final type Next[NewValue, NewFocus] = GCursor.AuxL[T, NewValue, NewFocus, Self] |
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starting to look like profunctor optics
beezee
reviewed
Sep 25, 2020
| CursorHistory(history, Some(NonEmptyVector.of(failedOp))) | ||
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| @inline final private def id[B](b: B): Id[B] = b | ||
| @inline final private def dup[B](b: B): Id[(B, B)] = (b, b) |
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this is 1/2 monoid and 1/2 comonoid - worth thinking about b/c those are precursors to monad/comonad if you don't have either already
beezee
reviewed
Sep 25, 2020
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| lazy val root: GCursor.Top[T] = self.root | ||
| lazy val focus: NewFocus = newFocus | ||
| lazy val last: Option[GCursor.AuxL[T, A, self.Focus, self.Last]] = Some(self) |
beezee
reviewed
Sep 25, 2020
| * @param ev Evidence that the current focus is a `(List[A], Int)` | ||
| * @see def moveList | ||
| */ | ||
| final def rightN(n: Int)(implicit ev: Focus =:= (List[A], Int)): Either[CursorHistory, Next[A, (List[A], Int)]] = |
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looking like a zipper. comonad
beezee
reviewed
Sep 25, 2020
| * @param ev Evidence that the current focus is a `List[B]` | ||
| * @return A new cursor focused on the first element in the list, `None` if the list was empty | ||
| */ | ||
| final def downArray[B](implicit ev: A =:= List[B]): Either[CursorHistory, Next[B, (List[B], Int)]] = |
beezee
reviewed
Sep 25, 2020
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