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d: create the Parser.Context class

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This will provide the user an interface for creating custom error messages.

* data/skeletons/lalr1.d: Add the Context class.
* doc/bison.texi: Document it.
This commit is contained in:
Adela Vais
2020-10-25 16:19:55 +02:00
committed by Akim Demaille
parent 98691fcd2d
commit 0cd16ae964
2 changed files with 102 additions and 31 deletions
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doc/bison.texi
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@@ -13948,10 +13948,29 @@ enumerators are forged from the symbol names. Use void toString(W)(W sink) to g
the symbol names.
@end defcv
@deftypemethod {YYParser.Context} {YYParser.Location} yylloc_from_stack()
@deftypemethod {YYParser.Context} {YYParser.SymbolKind} getToken()
The kind of the lookahead. Return @code{null} iff there is no lookahead.
@end deftypemethod
@deftypemethod {YYParser.Context} {YYParser.Location} getLocation()
The location of the lookahead.
@end deftypemethod
@deftypemethod {YYParser.Context} {int} getExpectedTokens(@code{YYParser.SymbolKind[]} @var{argv}, @code{int} @var{argc})
Fill @var{argv} with the expected tokens, which never includes
@code{SymbolKind.YYERROR}, or @code{SymbolKind.YYUNDEF}.
Never put more than @var{argc} elements into @var{argv}, and on success
return the number of tokens stored in @var{argv}. If there are more
expected tokens than @var{argc}, fill @var{argv} up to @var{argc} and return
0. If there are no expected tokens, also return 0, but set @code{argv[0]}
to @code{null}.
If @var{argv} is null, return the size needed to store all the possible
values, which is always less than @code{YYNTOKENS}.
@end deftypemethod
@node D Scanner Interface
@subsection D Scanner Interface
@c - %code lexer