Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!feeds.phibee-telecom.net!newsfeed.xs4all.nl!newsfeed1a.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Return-Path: <ian.g.kelly@gmail.com>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: OK 0.018
X-Spam-Evidence: '*H*': 0.96; '*S*': 0.00; 'args': 0.07; 'subject:help': 0.08; '__future__': 0.16; 'alphanum': 0.16; 'args.': 0.16; 'expecting': 0.16; 'optional': 0.16; 'syntaxerror:': 0.16; 'followed': 0.16; 'wrote:': 0.18; 'trying': 0.19; 'feb': 0.22; 'import': 0.22; 'tests': 0.22; 'looks': 0.24; 'header:In-Reply-To:1': 0.27; 'function': 0.29; 'am,': 0.29; 'message-id:@mail.gmail.com': 0.30; "i'm": 0.30; 'fine,': 0.31; 'produces': 0.31; 'class': 0.32; 'fri,': 0.33; 'subject:with': 0.35; 'but': 0.35; 'received:google.com': 0.35; 'subject:?': 0.36; 'should': 0.36; 'list': 0.37; 'lists.': 0.38; 'to:addr:python- list': 0.38; 'list,': 0.38; 'to:addr:python.org': 0.39; 'skip:u 10': 0.60; 'more': 0.64; '2015': 0.84; 'recursive.': 0.84
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :content-type; bh=gGcQ5xq0edSLRLRT9rqI++VkeVdkv2Z6TTJxgQ0/U+Y=; b=y2/Aqyj1JeOb6H2derCQVYtpfKKIPm6XqtKtDqF4g82HdioL3bHuSPIYZZgjzCZi16 Zb6dQulUv+h728NpFN510amZ6lVB826PU/x1JbB6eWNESgTNesN5zzj2PDRR6Nz5zMvY tNER3VaaDsP0xzh8Cq5ZLtlSZOKyydJvDMxGdQlIJJCaa36cXBGz9RCEasld4rxwix3V 65fGg9A2vaIwELbXfP41zvhKCWGv+eOq1XQEsBvCN1VfyDoXiQzcDUS2ZSuNZbKVLt0r 2Un6Je6h9/3F/G9sEIeCrSewWOtdOUeaOcidiY0kb5ZgSeyUqdVhBXDRLcWU6dEPCwsj lD3A==
X-Received: by 10.70.135.165 with SMTP id pt5mr7104350pdb.101.1423240850546; Fri, 06 Feb 2015 08:40:50 -0800 (PST)
MIME-Version: 1.0
In-Reply-To: <mb2klq$3r5$1@ger.gmane.org>
References: <mb2klq$3r5$1@ger.gmane.org>
From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Fri, 6 Feb 2015 09:40:10 -0700
Subject: Re: help with pypeg2?
To: Python <python-list@python.org>
Content-Type: text/plain; charset=UTF-8
X-BeenThere: python-list@python.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe: <https://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive: <http://mail.python.org/pipermail/python-list/>
List-Post: <mailto:python-list@python.org>
List-Help: <mailto:python-list-request@python.org?subject=help>
List-Subscribe: <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups: comp.lang.python
Message-ID: <mailman.18510.1423240859.18130.python-list@python.org>
Lines: 24
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1423240859 news.xs4all.nl 2844 [2001:888:2000:d::a6]:54877
X-Complaints-To: abuse@xs4all.nl
Xref: csiph.com comp.lang.python:85297

On Fri, Feb 6, 2015 at 7:55 AM, Neal Becker <ndbecker2@gmail.com> wrote:
> Trying out pypeg2.  The below grammar is recursive.  A 'Gen' is an ident
> followed by parenthesized args.  args is a csl of alphanum or Gen.
>
> The tests 'p' and 'p2' are fine, but 'p3' fails
> SyntaxError: expecting u')'
>
>
> from __future__ import unicode_literals, print_function
> from pypeg2 import *
>
> ident = re.compile (r'[a-z]+')
> alphanum = re.compile (r'[a-z0-9]+')
> num = re.compile (r'[0-9]+')
>
> class args (List):
>     grammar = maybe_some ( csl ([alphanum, Gen]))

I'm not familiar with pypeg2, but should this use optional instead of
maybe_some? The csl function already produces a list, so the result of
maybe_some on that would be one or more consecutive lists.

Also, it looks from the docs like it should just be "csi(alphanum,
Gen)" (no list in the arguments).