[Rd] Help finding some code in the R source code

[Greg Evans]

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