Re: parsing the content of a terminal

[Hans Aberg]

On 25 Nov 2005, at 16:04, Arkadius Nowakowski wrote:

> I've got to parse a grammar (BSDL) that contains strings.
> That strings furthermore contain information which has to be parsed.
> The problem lies in the concatenation of the BSDL strings:
>
> " substring_1 " &
> " substring_2 " &
> ...
> " substring_n "
>
> What I have to do now is build the whole string and parse its content:
> " substring_1 substring_2 ... substring_n "
>
> Don't know if I'm right, but I guess the complete string has to be a
> terminal. And I have to call bison in a recursvie way to parse the
> content of the string. I've searched the internet but I could not find
> enough information how to do this.

First, whenever you try to implement a well-known grammar, check out  
first if somebody else might already have tried it. You might put up  
a question in the Usenet newsgroup comp.compilers.

Otherwise, the stuff does not have to be anywhere: you put it where  
it works. If it is simpler to concatenate the strings in the lexer,  
do that. Otherwise, you can build the string in the parser grammar  
actions, provided that your semantic type supports string. If you do  
the latter, make sure your lexer properly clones the strings into the  
semantic type from the lexer buffer.

  Hans Aberg