[antlr-interest] Unreachable alternatives problem...
Aravinda Dassanayake
aravinda777 at gmail.com
Thu Dec 20 06:42:50 PST 2007
Hi everybody,
I'm working on a C# grammar to create a complexity calculation tool,
and I'm getting the following warning when a grammar check is done.
[12:05:42] Checking Grammar...
[12:05:44] warning(201): C_Sharp_warning_rem.g:45:28: The following
alternatives are unreachable: 1,2
[12:05:44] warning(208): C_Sharp_warning_rem.g:2047:1: The following
token definitions are unreachable:
DELIMITED_COMMENT,SINGLE_LINE_COMMENT,IDENTIFIER_OR_KEYWORD,DECIMAL_DIGITS,INTEGER_TYPE_SUFFIX,HEX_DIGIT,REAL_TYPE_SUFFIX,SINGLE_CHARACTER,SIMPLE_ESCAPE_SEQUENCE,HEXADECIMAL_ESCAPE_SEQUENCE,UNICODE_ESCAPE_SEQUENCE,REGULAR_STRING_LITERAL,SINGLE_REGULAR_STRING_LITERAL_CHARACTER,VERBATIM_STRING_LITERAL,SINGLE_VERBATIM_STRING_LITERAL_CHARACTER,QUOTE_ESCAPE_SEQUENCE,NULL_LITERAL
Could you please enlighten me on what exactly is meant by saying that
alternatives are unreachable as above, and how to get over them?
FYI, in my case I have glbal backtracking = true for the moment to
avoid a load of other warnings.
A quick response is highly appreciated.
Regards,
Aravinda
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