Re: How to properly use VARIABLE-TAG

Hi Gracjan,

The grammars in Semantic are a little different than what you may be 
used to in that the iteration between tags is declared outside the 
grammar.  The grammar is called and returns one tag, then the grammar is 
called again starting at the next lexical symbol.

Thus your grammar would be just:

%token WORD
%start start

start : word
       | next-tag-to-impl
       ;

word : WORD
         (VARIABLE-TAG $1 nil nil)
      ;

next-tag-to-impl : ...
      ;


thus supporting many kinds of tags.   Once all the tags are found, there 
is a process that will split compound tags apart, which is useful for 
languages that can declare multiple things in one statement, such as 
this in C:

int a, b;

Good Luck
Eric

On 02/12/2016 03:33 PM, Gracjan Polak wrote:
> Hi all,
>
> I try to get around Wisent/Semantic and I'm playing with toy languages
> at this point. Issue I'm stuck with is how to mark multiple variable
> declarations.
>
> My toy language has only WORD terminal and all terminals should get
> VARIABLE-TAG. I tried this:
>
> %token WORD
> %start words
>
> words : word
>        | words word
>          (append $1 (list $2))
>        ;
>
> word : WORD
>          (VARIABLE-TAG $1 nil nil)
>       ;
>
> The above seems to mark only first word as variable. How to properly use
> VARIABLE-TAG so that all word as marked as variables?
>
> --
> Gracjan
>
>
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