/[bison]/bison/TODO
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revision 1.54 by akim, Thu May 2 15:06:46 2002 UTC revision 1.55 by akim, Thu May 2 16:12:35 2002 UTC
# Line 21  When implementing multiple-%union suppor Line 21  When implementing multiple-%union suppor
21            char *sval;            char *sval;
22          }          }
23    
 * Language independent actions  
   
 Currently bison, the generator, transforms $1, $$ and so forth into  
 direct C code, manipulating the stacks.  This is problematic, because  
 (i) it means that if we want more languages, we need to update the  
 generator, and (ii), it forces names everywhere (e.g., the C++  
 skeleton would be happy to use other naming schemes, and actually,  
 even other accessing schemes).  
   
 Therefore we want  
   
 1. the generator to replace $1, etc. by M4 macro invocations  
    (b4_dollar(1), b4_at(3), b4_dollar_dollar) etc.  
   
 2. the skeletons to define these macros.  
   
 But currently the actions are double-quoted, to protect them from M4  
 evaluation.  So we need to:  
   
 3. stop quoting them  
   
 4. change the [ and ] in the actions into @<:@ and @:>@  
   
 5. extend the postprocessor to maps these back onto [ and ].  
   
24  * Coding system independence  * Coding system independence
25  Paul notes:  Paul notes:
26    

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