Re: Object Pascal grammar (for LALR parser)

Article View: borland.public.delphi.documentation

Article #105

Back to borland.public.delphi.documentation Previous Next

#105

From: Hans-Peter Diettrich
Date: Fri, 01 Jun 2007 03:47

31 lines
2138 bytes

Andrej wrote:

> I'm developing a parsing tool for for Delphi source files.
> 
> As yet, I had no luck in finding the complete grammar for the language.

Since nobody can be sure, when a grammar is complete, except by 
disassembling the compiler...

> There is a "formal grammar" in Delphi 7 help, but it's has too many mistakes 
> and surely isn't the grammar supposed to build parsers! I just spent two 
> hours re-writing it to Backus-Naur form by hand - seems like it's not 
> "formal" at all... ;)

Right, nobody ever specified the grammar of that so-called grammar. 
AFAIR the Delphi grammar was LL(1) until D2, nowadays it may be a bit 
higher. A complete and valid formal description of the current Delphi 
syntax IMO is impossible in a context free grammar, you may be better 
off by moving some details from the syntax into the semantics, or by 
using some kind of attributed grammar.

> Thanks,

For what?

If you only need an parser, you better forget about a grammar, and use 
the parser of FreePascal instead.

DoDi

Technical Details

Message-ID: <465f96f8$1@newsgroups.borland.com>

Path:

arc1-ca.pugleaf.net!g2news1.google.com!news4.google.com!proxad.net!feeder1-2.proxad.net!213.200.89.82.MISMATCH!tiscali!newsfeed1.ip.tiscali.net!newsfeed00.sul.t-online.de!newsfeed01.sul.t-online.de!t-online.de!newsgroups.borland.com!not-for-mail

References: <465f53c9@newsgroups.borland.com>

Show Full Headers

Complete Article Headers

X-Google-Thread: 10a202,7a4ae49aca5ba6e9
X-Google-Attributes: gid10a202,public,usenet
X-Google-Language: ENGLISH,ASCII-7-bit
Date: Fri, 01 Jun 2007 05:47:47 +0200
From: Hans-Peter Diettrich <DrDiettrich1@aol.com>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.13) Gecko/20060414
X-Accept-Language: en-us, en, de-de, de
MIME-Version: 1.0
Newsgroups: borland.public.delphi.documentation
Subject: Re: Object Pascal grammar (for LALR parser)
References: <465f53c9@newsgroups.borland.com>
In-Reply-To: <465f53c9@newsgroups.borland.com>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
NNTP-Posting-Host: 172.179.214.232
Message-ID: <465f96f8$1@newsgroups.borland.com>
X-Trace: newsgroups.borland.com 1180669688 172.179.214.232 (31 May 2007 20:48:08 -0700)
Lines: 31
Path: arc1-ca.pugleaf.net!g2news1.google.com!news4.google.com!proxad.net!feeder1-2.proxad.net!213.200.89.82.MISMATCH!tiscali!newsfeed1.ip.tiscali.net!newsfeed00.sul.t-online.de!newsfeed01.sul.t-online.de!t-online.de!newsgroups.borland.com!not-for-mail

Reply to Parent Message