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Deep Into Pharo: PPExpressionParser

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Sean P. DeNigris

Deep Into Pharo: PPExpressionParser

Administrator

After reading the PetitParser chapter, I'm not clear when one would subclass PPCompositeParser vs. using PPExpressionParser. What are the tradeoffs / use cases? Also, can the book be improved or is that the final version? Thanks.

Cheers,
Sean

Tudor Girba-2

Re: Deep Into Pharo: PPExpressionParser

Hi,

PPExpressionParser is not meant to be subclassed. Read the class comment to see how to use it.

PPCompositeParser is meant to be subclassed and it offers a neat mapping between methods and variables to support caching of parsers. Take a look at the subclasses in the Moose image:

http://www.moosetechnology.org/download/5.0

If you are at it, in the Moose image, you also get a dedicated browser (World menu / Moose / PetitParser browser) for manipulating subclasses of PPCompositeParser.

Cheers,

Doru

On Tue, Nov 5, 2013 at 10:11 PM, Sean P. DeNigris <[hidden email]> wrote:

After reading the PetitParser chapter, I'm not clear when one would subclass
PPCompositeParser vs. using PPExpressionParser. What are the tradeoffs / use
cases? Also, can the book be improved or is that the final version? Thanks.

-----
Cheers,
Sean
--
View this message in context: http://forum.world.st/Deep-Into-Pharo-PPExpressionParser-tp4719454.html
Sent from the Pharo Smalltalk Developers mailing list archive at Nabble.com.

www.tudorgirba.com

"Every thing has its own flow"

Sean P. DeNigris

Re: Deep Into Pharo: PPExpressionParser

Administrator

Thanks! I'm clear on how to use them, just not on why to choose one over the other...

Cheers,
Sean

Stéphane Ducasse

Re: Deep Into Pharo: PPExpressionParser

In reply to this post by Sean P. DeNigris

On Nov 5, 2013, at 10:11 PM, Sean P. DeNigris <[hidden email]> wrote:

> After reading the PetitParser chapter, I'm not clear when one would subclass
> PPCompositeParser vs. using PPExpressionParser. What are the tradeoffs / use
> cases? Also, can the book be improved or is that the final version? Thanks.

The book is to be improved please help :)

>
>
>
> -----
> Cheers,
> Sean
> --
> View this message in context: http://forum.world.st/Deep-Into-Pharo-PPExpressionParser-tp4719454.html
> Sent from the Pharo Smalltalk Developers mailing list archive at Nabble.com.
>

Stephan Eggermont-3

Re: Deep Into Pharo: PPExpressionParser

In reply to this post by Sean P. DeNigris

Hi Sean,

In PetitDelphi, we defined a few convenience methods
like plusFor:separatedByToken: that you might find useful.

Stephan

NorbertHartl

Re: Deep Into Pharo: PPExpressionParser

Am 06.11.2013 um 17:32 schrieb Stephan Eggermont <[hidden email]>:

> Hi Sean,
>
> In PetitDelphi, we defined a few convenience methods
> like plusFor:separatedByToken: that you might find useful.

You may have a look at PParser>>#delimitedBy:

Norbert

Stephan Eggermont-3

Re: Deep Into Pharo: PPExpressionParser

In reply to this post by Sean P. DeNigris

Norbert wrote:
>You may have a look at PParser>>#delimitedBy:

Thank you.

Stephan

Damien Cassou

Re: Deep Into Pharo: PPExpressionParser

In reply to this post by Sean P. DeNigris

On Wed, Nov 6, 2013 at 12:41 PM, Sean P. DeNigris <[hidden email]> wrote:
> Thanks! I'm clear on how to use them, just not on why to choose one over the
> other..

I would say you can instantiate a PPExpressionParser if you want to do
a small parser for small task. Now, if you have a grammar that's
composed of many parsers, I would subclass PPCompositeParser.

--
Damien Cassou
http://damiencassou.seasidehosting.st

"Success is the ability to go from one failure to another without
losing enthusiasm."
Winston Churchill

Sean P. DeNigris

Re: Deep Into Pharo: PPExpressionParser

Administrator

Thanks, that's exactly what I was wondering. That would be a valuable clarification in the book. Is there an issue tracker?

-------- Original message --------
From: "Damien Cassou [via Smalltalk]" <[hidden email]>
Date: 11/07/2013 7:38 AM (GMT-05:00)
To: "Sean P. DeNigris" <[hidden email]>
Subject: Re: Deep Into Pharo: PPExpressionParser

On Wed, Nov 6, 2013 at 12:41 PM, Sean P. DeNigris <[hidden email]> wrote:
> Thanks! I'm clear on how to use them, just not on why to choose one over the
> other..

I would say you can instantiate a PPExpressionParser if you want to do
a small parser for small task. Now, if you have a grammar that's
composed of many parsers, I would subclass PPCompositeParser.

--
Damien Cassou
http://damiencassou.seasidehosting.st

"Success is the ability to go from one failure to another without
losing enthusiasm."
Winston Churchill

If you reply to this email, your message will be added to the discussion below:

http://forum.world.st/Deep-Into-Pharo-PPExpressionParser-tp4719454p4719808.html

To unsubscribe from Deep Into Pharo: PPExpressionParser, click here.
NAML

Cheers,
Sean

Damien Cassou

Re: Deep Into Pharo: PPExpressionParser

On Thu, Nov 7, 2013 at 5:31 PM, Sean P. DeNigris <[hidden email]> wrote:
> Thanks, that's exactly what I was wondering. That would be a valuable
> clarification in the book. Is there an issue tracker?

no issue tracker. We encourage people to change the text directly :-D

--
Damien Cassou
http://damiencassou.seasidehosting.st

"Success is the ability to go from one failure to another without
losing enthusiasm."
Winston Churchill

Stéphane Ducasse

Re: Deep Into Pharo: PPExpressionParser

In reply to this post by Sean P. DeNigris

sean

damien was the main lead behind the chapter so sync with him :)

Stef

On Nov 7, 2013, at 5:31 PM, Sean P. DeNigris <[hidden email]> wrote:

Thanks, that's exactly what I was wondering. That would be a valuable clarification in the book. Is there an issue tracker?

-------- Original message --------
From: "Damien Cassou [via Smalltalk]" <<a href="x-msg://1055/user/SendEmail.jtp?type=node&node=4719909&i=0" target="_top" rel="nofollow" link="external">[hidden email]>
Date: 11/07/2013 7:38 AM (GMT-05:00)
To: "Sean P. DeNigris" <<a href="x-msg://1055/user/SendEmail.jtp?type=node&node=4719909&i=1" target="_top" rel="nofollow" link="external">[hidden email]>
Subject: Re: Deep Into Pharo: PPExpressionParser

On Wed, Nov 6, 2013 at 12:41 PM, Sean P. DeNigris <<a href="x-msg://1055/user/SendEmail.jtp?type=node&node=4719808&i=0" target="_top" rel="nofollow" link="external">[hidden email]> wrote:
> Thanks! I'm clear on how to use them, just not on why to choose one over the
> other..

I would say you can instantiate a PPExpressionParser if you want to do
a small parser for small task. Now, if you have a grammar that's
composed of many parsers, I would subclass PPCompositeParser.

--
Damien Cassou
http://damiencassou.seasidehosting.st

"Success is the ability to go from one failure to another without
losing enthusiasm."
Winston Churchill

If you reply to this email, your message will be added to the discussion below:
http://forum.world.st/Deep-Into-Pharo-PPExpressionParser-tp4719454p4719808.html

To unsubscribe from Deep Into Pharo: PPExpressionParser, <a href="x-msg://1055/" target="_top" rel="nofollow" link="external">click here.
NAML

Cheers,
Sean

View this message in context: Re: Deep Into Pharo: PPExpressionParser
Sent from the Pharo Smalltalk Developers mailing list archive at Nabble.com.

Damien Cassou

Re: Deep Into Pharo: PPExpressionParser

In reply to this post by Sean P. DeNigris

On Thu, Nov 7, 2013 at 5:31 PM, Sean P. DeNigris <[hidden email]> wrote:
> Thanks, that's exactly what I was wondering. That would be a valuable
> clarification in the book.

Book updated. Please buy a new copy :-).

--
Damien Cassou
http://damiencassou.seasidehosting.st

"Success is the ability to go from one failure to another without
losing enthusiasm."
Winston Churchill

Stéphane Ducasse

Re: Deep Into Pharo: PPExpressionParser

>
>> Thanks, that's exactly what I was wondering. That would be a valuable
>> clarification in the book.
>
>
> Book updated. Please buy a new copy :-).

$)

Stef