From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,FREEMAIL_FROM
	autolearn=ham autolearn_force=no version=3.4.4
X-Google-Thread: 103376,a3b1adae5552af6d
X-Google-NewGroupId: yes
X-Google-Attributes: gida07f3367d7,domainid0,public,usenet
X-Google-Language: ENGLISH,UTF8
Path: 
 g2news1.google.com!news3.google.com!feeder2.cambriumusenet.nl!feed.tweaknews.nl!138.195.8.3.MISMATCH!news.ecp.fr!aioe.org!.POSTED!not-for-mail
From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
 =?utf-8?Q?=29?=
 <yannick_duchene@yahoo.fr>
Newsgroups: comp.lang.ada
Subject: Re: Text parsing package
Date: Mon, 28 Mar 2011 02:15:31 +0200
Organization: Ada @ Home
Message-ID: <op.vs01n5xgule2fv@index.ici>
References: 
 <4fa6c081-910a-4e62-928a-0f6cdd1da951@l18g2000yqm.googlegroups.com>
 <v6w93r8pxrcx$.b590s9zimz0o$.dlg@40tude.net>
NNTP-Posting-Host: V1OIK4q3suj5TMnLVMs0MA.user.speranza.aioe.org
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed; delsp=yes
Content-Transfer-Encoding: Quoted-Printable
X-Complaints-To: abuse@aioe.org
User-Agent: Opera Mail/11.01 (Linux)
X-Notice: Filtered by postfilter v. 0.8.2
Xref: g2news1.google.com comp.lang.ada:18529
Date: 2011-03-28T02:15:31+02:00
List-Id: <comp.lang.ada>

Le Wed, 23 Mar 2011 09:32:10 +0100, Dmitry A. Kazakov  =

<mailbox@dmitry-kazakov.de> a =C3=A9crit:
> 1. Don't use unbounded strings. That is an unnecessary overhead.
Yes, better limit the maximum size of literals.

> 3. As others have mentioned, it is a good idea to abstract the source
> formats in order to be able to parse files, strings, streams etc.
And Ada already provides a root for that: Ada.Streams.Root_Stream_Type

> 6. You should decide what drives the parser. In your case it is the  =

> caller.
> That is not a good idea in most cases, because the caller rarely knows=
  =

> what
> to expect next. A better choice is semantic call-backs from the parser=
 to
> the caller. Abstract primitive operations is IMO the best implementati=
on  =

> of
> such callbacks.
What =E2=80=9Cdrives=E2=80=9D, is not just a question rising with parser=
s, it is rising  =

every where. Here, if Ada had something like a Yield, this would be nice=
  =

too. Otherwise, yes, the callback is a good choice and may allow  =

optimization, especially if some kind of seeking into the source is an  =

expected option (the parser can then efficiently skip what is not  =

relevant; on the opposite, if the caller drives, then no such optimizati=
on  =

is possible).


-- =

Si les chats miaulent et font autant de vocalises bizarres, c=E2=80=99es=
t pas pour  =

les chiens.
=E2=80=9C c++; /* this makes c bigger but returns the old value */ =E2=80=
=9D [Anonymous]