Hi,
I have a fairly simple grammar which give me an error I cannot resolve.
Could you please look at it? What does it mean and how to fix it?
Thanks a lot.
[14:20:29] warning(200): C:\tools\verilog\verilog_params\Test.g:4:43:
Decision can match input such as "IDENT..ESCAPED_IDENT" using multiple
alternatives: 1, 2
As a result, alternative(s) 2 were disabled for that input
[14:20:29] error(201): C:\tools\verilog\verilog_params\Test.g:4:43: The
following alternatives can never be matched: 2
grammar Test;
hierarchical_identifier
: (identifier '.') => hierarchical_identifier2
| identifier
;
hierarchical_identifier2
: identifier '.' (hierarchical_identifier)+
;
identifier
: IDENT
| ESCAPED_IDENT
;
IDENT
: ('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|'_'|'$'|'0'..'9')*
;
ESCAPED_IDENT
: '\\' (~ (' '|'\r'|'\t'|'\n'))+
;
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