About Smacc

Hello,

I want to use SmaccParser with my Expert System. I want to parse a String of the form : (A&B)->C and/or A->C and/or ((A&B)|C)->D

I created a suclass of SmaccParser and SmaccScanner but I don't know to utilise SmaCC. If you could help me to understand and use theses classes.

Thanks for your request.
Sébastien Aubry.

??

I do not understand. Did you try to open the SmaCC editor ? If no,  
try World menu/open.
It also includes a tutorial.

cheers,
Alexandre


Am May 18, 2006 um 3:18 PM schrieb Sebastien Aubry:

--
_,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:
Alexandre Bergel  http://www.cs.tcd.ie/Alexandre.Bergel
^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

If you don't have any menu entry for "Smacc Parser Generator" in your  
"World Menu", download "SmaccDev" (for Squeak 3.9>=) or "Smacc  
Development" (for Squeak <=3.8) from SqueakMap and use the generator  
to create your "scanner" and "parser" definitions - no need to create  
them by hand ;) - Smacc will create the scanner and parser classes  
for you. The generator-ui provides a simple help/tutorial on using  
Smacc ... and there are a several example-definitions available.

Cheers
Stef

On 18.05.2006, at 16:18, Sebastien Aubry wrote:

__________________________
http://www.reichhart.freezope.org

Let me try and re-ask this question.  (Maybe this is Sebastien's  
problem, maybe not).  It's certainly mine ;-)

I've downloaded SmaCC from Squeakmap. I've gone through the  
calculator tutorial (very nice) and generated a scanner and parser  
(two classes, CalculatorScanner and CalulatorParser).  There are also  
nice examples StScanner and StParser.  I can run them in the UI  
tool.  So far, so good.

I am completely at a loss to know how to use the Scanner and the  
Parser from other code.  I remember having the same problem with TGen  
years ago, and eventually giving up.  The generated code has no  
obvious entry point ...

I tried STParser parseMethod: sourceString and got an immediate  
walkback.  The answer is probably obvious when you know, but it is  
decidedly NON-obvious when you don't.  Can someone help?  Better  
still, can someone put this information in the documentation.

        Andrew


On 18 May 2006, at 07:18, Sebastien Aubry wrote:

On 26.05.2006, at 02:58, Andrew P. Black wrote:


the SmaCCParser superclass provides the method #parseStream:startingAt:

First parameter is the stream to parse, second the starting state of  
the parser. SmaCC
generates accessors for the possible starting states automatically  
(see method category
'generate starting states')

For the SqueakParser (part of NewCompiler), this method was  
implemented to make it
easy to use from other code:

parseMethod: stringOrStream

        ^ (self
                parseStream: stringOrStream readStream
                startingAt: self startingStateForMethod)
                source: stringOrStream contents

Thus,

  SqueakParser parseMethod: 'hello ^1'

will give you an RB AST.

For experiments, do not use the STParser. It's kind of broken *and*  
it just
generates a parse tree, which is not what's needed in most cases. The
SqueakParser (part of NewCompiler) can actually parse the whole image
*and* it directly generates an RB AST.

     Marcus

Hi,

> I am completely at a loss to know how to use the Scanner and the  
> Parser from other code.  I remember having the same problem with TGen  
> years ago, and eventually giving up.  The generated code has no  
> obvious entry point ...

Take a look at Magma + Lava.

Lava has a Smacc compiler for SQL. It uses the resulting parser in normal Smalltalk code.

Brent

Marcus

is the parseMethod: or equivalent now in the Smacc package?
Because it seems useful.

Stef

On 26.05.2006, at 22:26, stéphane ducasse wrote:

> Marcus
>
> is the parseMethod: or equivalent now in the Smacc package?
> Because it seems useful.
>


I makes no sense to have that in the Smacc package, as it is
specific to the Smalltalk grammar and even the parser
(it calls a method on the resulting object).

     Marcus

Ok I thought that it was an helper method of Smacc.

What I wanted to say is that how can we capitalize so that people get  
into Smacc in a easier way.