R devel - Nov 2005 - Help finding some code in the R source code

Hi,
 
I'm trying to write some Python code to check if a string text contains
a complete R statement.  I'm hoping someone will be able to point me to
the right place in the R source code, so I can use it as a starting
point.
 
For example, In the R console.
 
> x <- 1
> plot(
+ x
+ 
+ )
> 
 
If I type "plot(", the console adds a "+" until the
")" is entered.  I'm
looking for the place in the source code that adds the "+" symbol.
 
Thanks in advance,
Greg

Greg,

On Nov 13, 2005, at 7:03 PM, Greg Evans wrote:
> I'm trying to write some Python code to check if a string text  
> contains a complete R statement.  I'm hoping someone will be able  
> to point me to the right place in the R source code, so I can use  
> it as a starting point.
What happens internally is that R runs the expression through the  
parser. When the parser returns PARSE_INCOMPLETE then you know that  
the expression is not complete and thus more input is needed. If you  
are directly interfacing R from Python then you can easily do exactly  
the same thing.
However, if you want a solution in pure Python, it may be more  
difficult as it would be equal to re-writing the R parser in  
Python... (or some 'light' version of it..).

Cheers,
Simon