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revision 1.86 by akim, Wed Nov 6 14:11:46 2002 UTC revision 1.87 by akim, Thu Nov 7 13:57:01 2002 UTC
# Line 17  Write a first documentation for C++ outp Line 17  Write a first documentation for C++ outp
17    
18    
19  * Documentation  * Documentation
20  Before releasing, make sure the documentation refers to the current  Before releasing, make sure the documentation ("Understanding your
21  `output' format.  parser") refers to the current `output' format.
22    
23    
24  * GLR & C++  * GLR & C++
# Line 52  DeRemer and Penello: they already provid Line 52  DeRemer and Penello: they already provid
52    
53  * Extensions  * Extensions
54    
55  ** yyerror, yysymprint interface  ** %destructor
56    I think we should document it as experimental, and allow its use in
57    the next releases.  But we also need to port it to GLR.  What about
58    lalr1.cc?  Well, read what Hans reported, maybe we don't want
59    %detructor.  On the other hand, there is no reason not to provide it:
60    users can avoid its use.
61    
62    ** $foo
63    Have a look at the Lemon parser generator: instead of $1, $2 etc. they
64    can name the values.  This is much more pleasant.  For instance:
65    
66           exp (res): exp (a) '+' exp (b) { $res = $a + $b; };
67    
68    I love this.  I have been bitten too often by the removal of the
69    symbol, and forgetting to shift all the $n to $n-1.  If you are
70    unlucky, it compiles...
71    
72    ** $-1
73    We should find a means to provide an access to values deep in the
74    stack.  For instance, instead of
75    
76            baz: qux { $$ = $<foo>-1 + $<bar>0 + $1; }
77    
78    we should be able to have:
79    
80      foo($foo) bar($bar) baz($bar): qux($qux) { $baz = $foo + $bar + $qux; }
81    
82    Or something like this.
83    
84    
85    ** yysymprint interface
86  It should be improved, in particular when using Bison features such as  It should be improved, in particular when using Bison features such as
87  locations, and YYPARSE_PARAMS.  For the time being, it is recommended  locations, and YYPARSE_PARAMS.  For the time being, it is almost
88  to #define yyerror and yyprint to steal internal variables...  recommended to yyprint to steal internal variables...
89    
90  ** Several %unions  ** Several %unions
91  I think this is a pleasant (but useless currently) feature, but in the  I think this is a pleasant (but useless currently) feature, but in the

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