[ragel-users] recursion with ragel

[Adrian Thurston]

Hi Gaspard,

You can find the old messages in the archive of the new list. I imported
the messages from google groups. We just need the search engines to
catch on.

-Adrian

Gaspard Bucher wrote:
> Hi list !
> 
> I am sure this question has been answered a thousand times, but I
> could not find the list archives (all pages from google point to
> "group not found").
> 
> Anyway: I am implementing a json like parser and want to use recursion:
> 
> This is what I want to parse:
> "{ url:'foo' opts:{ bar:4.5 }}"
> 
> To cope with the hash in the hash, I want to open a new parser after each key:
> 
> "{ url:" ===> new parser with "'foo' opts:{ bar:4.5 }}", returns
> number of eaten chars
> 
> I then want to update the position of *p. This is the code:
> 
> action hash_value {
>   p++;
>   p += tmp_val.from_string(p);
>   tmp_h.set(key, tmp_val);
>   key = "";
> }
> 
> My problem: closing '}' is not parsed correctly and then "@hash" is
> never executed.
> 
> Regex:
>   ...
>   hash      = '{' (ws* string ':' >hash_value)* ws* '}';
>   main     := ws* (string @string | number @number | hash @hash);
> 
> Many thanks for your help !
> 
> Gaspard
> 
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