From: Mathieu Bouchard <matju@...>
Date: 2002-01-16T12:49:10+09:00
Subject: Re: Markus' ruby-parser


On Mon, 14 Jan 2002, Robert Feldt wrote:
> On Mon, 14 Jan 2002, Mathieu Bouchard wrote:
> > How about a shareable test suite ? The main issue I see is there are
> Yes, that would be nice. Me and Rich Kilmer (who wrote some of the
> tests) used RubyUnit while Marcus used a home-grown variant (based on some
> of your stuff?).

It should be easy to convert everything to RubyUnit. I can take care of
that the day I finally take the time to learn RubyUnit.

> IMHO, we should strive for one parse for each program but it won't happen
> until we have a common AST representation so we need to start there.

I meant even supposing that we agree on a common AST representation...
Some things may happen depending on what degree of commonality there
is. There is nothing preventing a RubySchema parser from introducing
slight divergences like unneccessary Body[[x]] instead of just x in some
places, etc.

> The main benefit with having few but general constructs (low
> resolution) is that there are fewer classes that you need to learn and
> handle when extending etc. The drawback is that you may need to "parse
> once more" ie. decide what kind of method call you have based on the
> method id and arguments etc. Since the lower resolution implies more
> general classes you have also lost information ie. was it written "a+b" or
> "a.+(b)".

True. I may add BinOp (or "Op2") to RubySchema while keeping it out of
MicroRubySchema; this is because the former schema has a fidelity
requirement (and the latter hasn't)

I don't want to go to high resolution because it will flood the list of
RubySchema Forms (there are already 61 of them). I don't envision much
code that will work on Plus expressions: there will be all kinds of
software working at very-low ("Form") and low/medium resolutions, but the
Plus expressions will be limited quite specifically to: Optimising
Compilers That Use Type Inference Or Declarations And Lots Of Smart
Inlining To The Point It's As Fast As C. Correct me if i'm wrong.

> > > (and the deadline for my PhD project started coming really close...
> > > ;-)).
> Still 6 weeks to go...

courage!

________________________________________________________________
Mathieu Bouchard                   http://hostname.2y.net/~matju