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Date: Thu, 21 Jun 2012 19:02:03 +0300
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Subject: Re: [lojban] Testing Lua/LPeg version of the Lojban PEG
From: Veijo Vilva <veijo.vilva@gmail.com>
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On 21 June 2012 14:36, Remo Dentato <rdentato@gmail.com> wrote:

> On Thu, Jun 21, 2012 at 10:08 AM, Veijo Vilva <veijo.vilva@gmail.com>
> wrote:
> > I,ve now got a preliminary version of the full parser running.
>
> That's realy great!
>
> Will you offer an API? I would love to have the possibility of setting
> call-backs for each element of the grammar. I did this for a (very
> basic) morphology analyzer done with LPeg
> (https://groups.google.com/d/topic/lojban/fSJWGpqr9eQ/discussion) and
> I found it easy to use.
>
> Or will you build up the parse tree and return it as result of a
> function? That would be fine as well.
>


There are two main PEG grammars, one for the morphology and one for the
syntax, and a third one used by the morphology PEG to classify cmavo.

The morphology PEG produces a Lua program segment containing one function
call per word. This program segment can be used to drive custom formatting
functions to produce input for an arbitrary back-end.

The parser PEG produces a parse tree in the form of a Lua table definition
which can be traversed by further processing steps like the pretty printer
I used to produce the example listings.

You can, of course, take the syntax LPeg and modify it to use call-backs,
but I'm not sure it is worth your while as it is much easier to play with
the parse tree. I'll be adding a few traversing functions like tree pruning
(to replace the pruning during pretty printing) and sumti enumeration,
which can be very useful for various purposes.

I expect to be able to release an alpha version pretty soon. I'll just
re-check the PEG, clean it a little bit and run through a random sample
from the CLL.

  Veijo

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<div dir=3D"ltr"><br><br><div class=3D"gmail_quote">On 21 June 2012 14:36, =
Remo Dentato <span dir=3D"ltr">&lt;<a href=3D"mailto:rdentato@gmail.com" ta=
rget=3D"_blank">rdentato@gmail.com</a>&gt;</span> wrote:<br><blockquote cla=
ss=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;pa=
dding-left:1ex">
<div class=3D"im">On Thu, Jun 21, 2012 at 10:08 AM, Veijo Vilva &lt;<a href=
=3D"mailto:veijo.vilva@gmail.com">veijo.vilva@gmail.com</a>&gt; wrote:<br>
&gt; I,ve now got a preliminary version of the full parser running.<br>
<br>
</div>That&#39;s realy great!<br>
<br>
Will you offer an API? I would love to have the possibility of setting<br>
call-backs for each element of the grammar. I did this for a (very<br>
basic) morphology analyzer done with LPeg<br>
(<a href=3D"https://groups.google.com/d/topic/lojban/fSJWGpqr9eQ/discussion=
" target=3D"_blank">https://groups.google.com/d/topic/lojban/fSJWGpqr9eQ/di=
scussion</a>) and<br>
I found it easy to use.<br>
<br>
Or will you build up the parse tree and return it as result of a<br>
function? That would be fine as well.<br></blockquote><div><br></div><div><=
br></div><div>There are two main PEG grammars, one for the morphology and o=
ne for the syntax, and a third one used by the morphology PEG to classify c=
mavo.</div>
<div><br></div><div>The morphology PEG produces a Lua program segment conta=
ining one function call per word. This program segment can be used to drive=
 custom formatting functions to produce input for an arbitrary back-end.</d=
iv>
<div><br></div><div>The parser PEG produces a parse tree in the form of a L=
ua table definition which can be traversed by further processing steps like=
 the pretty printer I used to produce the example listings.</div><div><br>
</div><div>You can, of course, take the syntax LPeg and modify it to use ca=
ll-backs, but I&#39;m not sure it is worth your while as it is much easier =
to play with the parse tree. I&#39;ll be adding a few traversing functions =
like tree pruning (to replace the pruning during pretty printing) and sumti=
 enumeration, which can be very useful for various purposes.</div>
<div><br></div><div>I expect to be able to release an alpha version pretty =
soon. I&#39;ll just re-check the PEG, clean it a little bit and run through=
 a random sample from the CLL.</div><div><br></div><div>=A0 Veijo</div><div=
>
<br></div><div><br></div></div>
</div>

<p></p>

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