mirror of
https://github.com/logos-storage/questionable.git
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91 lines
2.0 KiB
Nim
91 lines
2.0 KiB
Nim
import std/options
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import std/macros
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import ./chaining
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import ./indexing
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import ./operators
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import ./without
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include ./errorban
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export options except get
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export chaining
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export indexing
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export without
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template `?`*(T: typed): type Option[T] =
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Option[T]
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template `!`*[T](option: ?T): T =
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option.get
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template `->?`*[T,U](option: ?T, expression: U): ?U =
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if option.isSome:
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expression.some
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else:
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U.none
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template `->?`*[T,U](option: ?T, expression: ?U): ?U =
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if option.isSome:
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expression
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else:
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U.none
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template `->?`*[T,U,V](options: (?T, ?U), expression: V): ?V =
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if options[0].isSome and options[1].isSome:
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expression.some
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else:
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V.none
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template `->?`*[T,U,V](options: (?T, ?U), expression: ?V): ?V =
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if options[0].isSome and options[1].isSome:
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expression
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else:
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V.none
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template `=?`*[T](name: untyped{nkIdent}, expression: ?T): bool =
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let option = expression
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template name: T {.used.} = option.unsafeGet()
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option.isSome
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macro `=?`*[T](variable: untyped{nkVarTy}, expression: ?T): bool =
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let name = variable[0]
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quote do:
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let option = `expression`
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var `name` : typeof(option.unsafeGet())
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if option.isSome:
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`name` = option.unsafeGet()
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option.isSome
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template `|?`*[T](option: ?T, fallback: T): T =
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if option.isSome:
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option.unsafeGet()
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else:
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fallback
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macro `.?`*[T](option: ?T, brackets: untyped{nkBracket}): untyped =
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let index = brackets[0]
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quote do:
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type U = typeof(`option`.unsafeGet().?[`index`].unsafeGet())
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if `option`.isSome:
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`option`.unsafeGet().?[`index`]
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else:
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U.none
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Option.liftUnary(`-`)
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Option.liftUnary(`+`)
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Option.liftUnary(`@`)
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Option.liftBinary(`[]`)
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Option.liftBinary(`*`)
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Option.liftBinary(`/`)
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Option.liftBinary(`div`)
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Option.liftBinary(`mod`)
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Option.liftBinary(`shl`)
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Option.liftBinary(`shr`)
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Option.liftBinary(`+`)
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Option.liftBinary(`-`)
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Option.liftBinary(`&`)
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Option.liftBinary(`<=`)
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Option.liftBinary(`<`)
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Option.liftBinary(`>=`)
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Option.liftBinary(`>`)
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