Module "combinators/not"

Const not

• not<T>(parser: Parser<T>, fail?: Parser<T>): Parser<T>

• Runs parser, discards its result and if it passed returns false, else runs fail parser and returns its result. By default fail is using always, which consumes a single character and always succeeds. To avoid consuming a character on first parser's failure, use pass or passD instead.

  Type parameters

  • T

  Parameters

  • parser: Parser<T>

    -

  • Default value fail: Parser<T> = always()

    -

  Returns Parser<T>