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doc: add indexes

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* doc/bison.texi (Special Tokens): here.
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Akim Demaille
2021-12-18 17:52:01 +01:00
parent 6571c2d1b1
commit f8e8f57e9f
1 changed files with 3 additions and 0 deletions
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doc/bison.texi
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@@ -7546,15 +7546,18 @@ utility can be used without change as the definition of @code{yylex}.
In addition to the user defined tokens, Bison generates a few special tokens
that @code{yylex} may return.
@findex YYEOF
The @code{YYEOF} token denotes the end of file, and signals to the parser
that there is nothing left afterwards. @xref{Calling Convention}, for an
example.
@findex YYUNDEF
Returning @code{YYUNDEF} tells the parser that some lexical error was found.
It will emit an error message about an ``invalid token'', and enter
error-recovery (@pxref{Error Recovery}). Returning an unknown token kind
results in the exact same behavior.
@findex YYerror
Returning @code{YYerror} requires the parser to enter error-recovery
@emph{without} emitting an error message. This way the lexical analyzer can
produce an accurate error messages about the invalid input (something the