Re: Stopping as soon as a valid symbol is read

[Hans Aberg]

On 25 Jul 2011, at 16:22, Ludovic Courtès wrote:

>>> I’m trying to parse a C expression from an input stream.  I’d like the
>>> parser to stop as soon as a valid expression is read (or an error is
>>> encountered).
>>> 
>>> However, the default behavior is to stop whenever a valid expression
>>> /followed by the end-of-file marker/ is encountered.  Thus, if the input
>>> stream contains a sequence of 2 or more expressions, the parser will
>>> report an error because it’s expecting $end after the first expression.
>>> 
>>> Any idea how to achieve what I want?
>> 
>> It may be the push parser you are looking for. (See the Bison manual, sec. 
>> 3.7.11.)
> 
> Indeed, thanks!
> 
> However, with a pure API, I don’t see how to get yyresult back from user
> code?  The code snippet in the manual pushes tokens but never asks for
> the result.

Akim has been working on this parser; perhaps he can give an answer.

Hans