WhereParserExtension<R> extension

on

• Parser<R>

Methods

where(Predicate<R> predicate, {String? message, FailureFactory<R>? factory, Callback<R, String>? failureMessage, Callback<R, int>? failurePosition, FailureFactory<R>? failureFactory}) → Parser<R>

Available on Parser<R>, provided by the WhereParserExtension extension

Returns a parser that evaluates the predicate with the successful parse result. If the predicate returns true the parser proceeds with the parse result, otherwise a parse failure is created using the optionally specified factory callback, the provided message, or otherwise an automatically created error message.