Defines a TokenParser that, in case of a valid result passed to it, will fail with the
provided error semantic value.
If it is passed a ParseError, it will propagate it onwards with no change.
If it is passed a ParseResult, it will return the provided errorParseError and
parsing will stop at that point.
It enables error rules to be defined, that will define a part of the grammar that should always
fail when detected.
Returns
A new TokenParser whose execution will fail with an error or error in case a valid result is passed to it.
Defines a TokenParser that, in case of a valid result passed to it, will fail with the provided
errorsemantic value.If it is passed a ParseError, it will propagate it onwards with no change. If it is passed a ParseResult, it will return the provided
errorParseError and parsing will stop at that point.It enables error rules to be defined, that will define a part of the grammar that should always fail when detected.
Returns
A new TokenParser whose execution will fail with an error or
errorin case a valid result is passed to it.