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Fix for Nim 1.2.x

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This commit is contained in:
Mark Spanbroek 2023-11-20 14:40:07 +01:00
parent 48e8fe845f
commit a884e5bf64
1 changed files with 18 additions and 23 deletions
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41
questionable/indexing.nim
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@ -1,29 +1,24 @@
import std/macros import std/macros
import std/options
macro `.?`*(expression: seq | string, brackets: untyped{nkBracket}): untyped = proc safeGet[T](expression: seq[T] | openArray[T], index: int): Option[T] =
# chain is of shape: (seq or string).?[index] if index >= expression.low and index <= expression.high:
let index = brackets[0] expression[index].some
quote do: else:
block: T.none
type T = typeof(`expression`[`index`])
let evaluated = `expression`
if `index` >= evaluated.low and `index` <= evaluated.high:
evaluated[`index`].some
else:
T.none
macro `.?`*(expression: openArray, brackets: untyped{nkBracket}): untyped = proc safeGet(expression: string, index: int): Option[char] =
# chain is of shape: openArray.?[index] if index >= expression.low and index <= expression.high:
let index = brackets[0] expression[index].some
quote do: else:
block: char.none
type T = typeof(`expression`[`index`])
proc safeGet(arr: openArray[T], i: int): ?T {.gensym.} = macro `.?`*(expression: seq | string | openArray, brackets: untyped{nkBracket}): untyped =
if i >= arr.low and i <= arr.high: # chain is of shape: (seq or string or openArray).?[index]
arr[i].some let index = brackets[0]
else: quote do:
T.none block:
safeGet(`expression`, `index`) safeGet(`expression`, `index`)
macro `.?`*(expression: typed, brackets: untyped{nkBracket}): untyped = macro `.?`*(expression: typed, brackets: untyped{nkBracket}): untyped =
# chain is of shape: expression.?[index] # chain is of shape: expression.?[index]