Re: [Jython-dev] how does PythonPartial work?

[Jim B. <jb...@zy...>]

Yin,
PythonPartial is not meant to return an AST. Its sole purpose is to
determine if the input presented at the console is complete or not. For the
Python REPL, we need a separate grammar because it's OK if the partial parse
contains a fragment, such as a multiline string that's not been terminated
with a """.

PythonPartial is generated from PythonPartial.g, exposed by ParserFacade,
and documented in terms of its usage in the comments for
InteractiveInterpreter#runsource.

If you compare PythonPartial.g and Python.g, you will see the specifics of
this (I would not really look at the generated source in
PythonPartial.java). PythonPartial.g is just a parser grammar, with some
sharing against Python.g for tokens (tokenVocab). There is no AST
construction performed. In contrast, Python.g contains the tree construction
as needed for subsequent compilation, and is consequently a much larger
file.

- Jim

On Sat, May 30, 2009 at 4:28 AM, Yin Wang <yin...@gm...> wrote:

> Hi,
>
> I'm trying to figure out how to use the partial parser
> org.python.antlr.PythonPartial, but I haven't found how to get an AST
> from it. It doesn't even refer to any type in the PythonTree
> hierarchy. Strange. Any ideas or code examples? The file
> org.python.antlr.PythonPartialTester simple succeeds without giving
> out any value. It calls single_input() but that method's return type
> is void. Thanks.
>
>
> -- yin
>
>
> ------------------------------------------------------------------------------
> Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT
> is a gathering of tech-side developers & brand creativity professionals.
> Meet
> the minds behind Google Creative Lab, Visual Complexity, Processing, &
> iPhoneDevCamp as they present alongside digital heavyweights like Barbarian
> Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com
> _______________________________________________
> Jython-dev mailing list
> Jyt...@li...
> https://lists.sourceforge.net/lists/listinfo/jython-dev
>



-- 
Jim Baker
jb...@zy...