error with Delayed - lepl

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lepl
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Date: Wed, 5 May 2010 17:57:29 -0700 (PDT)
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Subject: [LEPL] Re: error with Delayed
From: jazg <tazg2...@gmail.com>
To: lepl <lepl@googlegroups.com>
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Both of those (using a function and upgrading) fixed the problem for
me.


On May 5, 8:38=A0pm, andrew cooke <and...@acooke.org> wrote:
> Thanks (and thanks for the nice simple test case).
>
> OK, so my initial attempts to reproduce this on 4.2.1 failed. =A0If you
> used easy_install, then
>
> =A0 easy_install -U lepl
>
> should update you to that.
>
> What's happening is that the internal representation used while
> rewriting a parser to a regular expression is "escaping". =A0My guess is
> that it didn't show up in tests for that release because once a parser
> is "complex enough", the rewriting is no longer possible and the
> internal representation is converted into a matcher.
>
> So a work around would be to force that (make the parser "complex
> enough") and the simplest way to do that is to add a function. =A0The
> following change (which basically does nothing, but calls the 'list'
> function/constructor to do it) might avoid the problem (if you have
> the time I'd be interested to know if it does):
>
> =A0 =A0 =A0 =A0 c =3D Delayed()
>
> =A0 =A0 =A0 =A0 a =3D Literal("a") + c
> =A0 =A0 =A0 =A0 b =3D Literal("b")
> =A0 =A0 =A0 =A0 c +=3D (a | b) >=3D list
>
> Anyway, I'll continue looking at this to make sure it really is fixed
> now (I don't understand what has changed to fix this in 4.2.1 - it may
> be a platform thing as I am using Linux). =A0if either of the above
> don't help, please say...
>
> Cheers,
> Andrew
>
> On May 5, 8:27=A0pm, jazg <tazg2...@gmail.com> wrote:
>
>
>
>
>
>
>
>
>
> > lepl 4.1, same error in python 2.7 and 3.1, windows xp
>
> > On May 5, 8:17=A0pm, andrew cooke <and...@acooke.org> wrote:
>
> > > Whoa. =A0Yes, that is very much a bug. =A0Do you know what version of=
 Lepl
> > > you have installed? =A0Also, it might be useful to know what Python
> > > version and OS (but to be honest it's such a bad bug I suspect it's
> > > going to be easy to reproduce). =A0I'll look at it now (need to switc=
h
> > > computers...) and get back to you with a fix or work-around ASAP.
>
> > > Thanks,
> > > Andrew
>
> > > On May 3, 3:48=A0am, jazg <tazg2...@gmail.com> wrote:
>
> > > > Here's the problem as simplified as possible:
>
> > > > c =3D Delayed()
>
> > > > a =3D Literal("a") + c
> > > > b =3D Literal("b")
> > > > c +=3D a | b
>
> > > > print c.parse("ab")
>
> > > > The error is:
> > > > lepl\matchers\core.py", line 215, in _match
> > > > AttributeError: 'RegexpContainer' object has no attribute '_match'
>
> > > > Is that a bug or am I doing something wrong? What can be done about=
 it?
>
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