toRecognizer
Universal function to turn an object into a recognizer. This function returns a token recognizer.
x may be:
A String, in which case the returned recognizer will attempt to match the string exactly. (Pseudo-recognizer)
A Char, which is identical to a String with a single character.
A CharRange, in which case the recognizer will attempt to match a single character from the given range. (Pseudo-recognizer)
A recognizer, in which case x will be returned directly. This is useful for having one-fits-all methods that can accommodate both directly taking in a recognizer and a pseudo-recognizer. (Recognizer)
If x does not match any of the previous types, a NiwenLexerException is thrown.
Return
A recognizer that matches the behaviors stated in the description of this function.
Parameters
An object, which can be either a String, a CharRange, or a TokenRecognizer