[squeak-dev] Smacc and CPD

Hi Folks!
 I'm trying to build a light version of a copy/paste detector (see http://pmd.sourceforge.net/cpd.html) in Squeak (for malltalk code), but I'm a novice in using Smacc, can you point me in the right direction or show me if there are similar projects developed by the Squeak community?
Thanks
 Davide

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No hints?
Davide

Davide Falzoni <[hidden email]> wrote:

Hi Folks!
 I'm trying to build a light version of a copy/paste detector (see http://pmd.sourceforge.net/cpd.html) in Squeak (for malltalk code), but I'm a novice in using Smacc, can you point me in the right direction or show me if there are similar projects developed by the Squeak community?
Thanks
 Davide

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> No hints?
> Davide

The NewCompiler on squeaksource.com uses SmaCC for example. SmaCC
itself comes with many examples. It also includes a small tutorial.

What I find a bit strange how you ask your question: "I have problem
X. How do I use SmaCC to solve it?" In my opinion you should first try
to formulate the steps to get to a solution and only afterwards look
for tools that could help you reaching this goal? I don't understand
what you want to do ...

Lukas

--
Lukas Renggli
http://www.lukas-renggli.ch

Davide, Lukas,

I'm just guessing here - Davide wants to compare the parse trees of,
say, two methods, as opposed to the source code. That's what the CPD
(copy/paste detector) is proud of, they can identify copied Java code
even if it was reformatted.

In Smalltalk, you can access or create the parse tree of a method (I
don't know how, sorry). So there is no need to write your own parser.

Another route would be to normalize the code before comparison, check
out the implementors / senders of prettyPrint:. Then you would compare
lines of normalized code.

HTH

Matthias





On Mon, Mar 3, 2008 at 11:05 PM, Lukas Renggli <[hidden email]> wrote:

Hi Matthias

--- Matthias Berth <[hidden email]>
wrote:

> Davide, Lukas,
>
> I'm just guessing here - Davide wants to compare the
> parse trees of,
> say, two methods, as opposed to the source code.
> That's what the CPD
> (copy/paste detector) is proud of, they can identify
> copied Java code
> even if it was reformatted.


Right, that's my purpose


> In Smalltalk, you can access or create the parse
> tree of a method (I
> don't know how, sorry).

So do I :-)

> So there is no need to write
> your own parser.

Ok

> Another route would be to normalize the code before
> comparison, check
> out the implementors / senders of prettyPrint:. Then
> you would compare
> lines of normalized code.


FYI, on the visualworks list, people suggest me to
look at smalldude
(http://moose.unibe.ch/tools/smalldude)

Thanks
 Davide



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