Path: csiph.com!usenet.pasdenom.info!weretis.net!feeder4.news.weretis.net!news.mixmin.net!news.albasani.net!.POSTED!not-for-mail
From: BGB <cr88192@hotmail.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: multi-line Strings
Date: Wed, 19 Dec 2012 08:26:00 -0600
Organization: albasani.net
Lines: 71
Message-ID: <kasivf$d8h$1@news.albasani.net>
References: <7f36342c-2331-4484-874b-4a0f8953f160@googlegroups.com> <50c61150$0$293$14726298@news.sunsite.dk> <ka56u9$5fk$1@dont-email.me> <jipxs.2271$fh5.1713@newsfe26.iad> <ka59ij$m8t$1@dont-email.me> <ka5afr$trm$1@dont-email.me> <50c6413a$0$293$14726298@news.sunsite.dk> <ka5jq4$tj7$1@dont-email.me> <50c6598d$0$290$14726298@news.sunsite.dk> <ka5pq4$5ao$1@dont-email.me> <ka5u2o$h19$1@localhost.localdomain> <50c69625$0$293$14726298@news.sunsite.dk> <ka8c8b$68v$3@localhost.localdomain> <50cbeec3$0$291$14726298@news.sunsite.dk> <MbednV3SS9RB-VHNnZ2dnUVZ8lqdnZ2d@bt.com> <50d1216e$0$287$14726298@news.sunsite.dk>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 8bit
X-Trace: news.albasani.net k2e59GhEzPsy9vpqqFJ+2ARRVZ+MjGj1llsz6TERaarPgQ1p5B8lJDH8JcC+bs+bmoX4nWUEpJmVb4nfcquhCS8POAug5olvqvWs0Fc8TSLDfqx/QQjE8zCI4Lq6+7/f
NNTP-Posting-Date: Wed, 19 Dec 2012 14:29:03 +0000 (UTC)
Injection-Info: news.albasani.net; logging-data="zT01KJAiSOONxRyuZkh2LKCyGMJLFf+aqVqOZyz3+nV8/ZlzXvpL90tzeNnHOVLmzTx6WpyNF07BZ+YfD9goXFgl7UoCLowDDbPnSP0poAd1hy/rPDgB4mMoQO5ZfygS"; mail-complaints-to="abuse@albasani.net"
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/17.0 Thunderbird/17.0
In-Reply-To: <50d1216e$0$287$14726298@news.sunsite.dk>
Cancel-Lock: sha1:aIc/pcSTdJNIuw2MVqNmEFkN2yE=
Xref: csiph.com comp.lang.java.programmer:20526

On 12/18/2012 8:07 PM, Arne Vajhøj wrote:
> On 12/15/2012 6:54 AM, Chris Uppal wrote:
>> Off-the-top-of-my-head (all classes and method are imaginary):
>>
>>      Regexp alpha = Regexp.fromList(java.lang.text.portable.Alphas);
>>      alpha = alpha.or('_');
>>      Regexp num = Regexp.fromList(java.lang.text.portable.Digits);
>>      Regexp alphanum = alpha.or(num);
>>      Regexp identifier = alpha.followedBy(alphanum.repeated());
>
> I think that is what is widely known in the .NET world
> as a fluent API.
>

better term maybe than "big pile o' nasty...".

yes, regex syntax could be nicer, but probably not by making it into a 
big pile of API calls.


maybe something more EBNF-like can be used, like say:
SyntaxPattern pat = new SyntaxPattern(
	"alpha = ('A'-'Z') | ('a'-'z');"
	"alpha2 = alpha | '_';",
	"hexalpha = ('A'-'F') | ('a'-'f');"
	"num = ('0'-'9');",
	"hexnum = num | hexalpha;",
	"alphanum = alpha2 | num;",
	"basenumber = num+;",
	"realnumber = basenumber '.' basenumber ['e' basenumber ];",
	"hexnumber = '0x' hexnum+;",
	"integer = basenumber | hexnumber;",
	"identifier = alpha2 alphanum*;",
	...);

StringReader strr = new StringReader("foo 999 bar69");
String tok;
...
if(pat.match(strr, "identifier"))
{
	tok=pat.readNext(strr, "identifier");
	...
}

or:
tok=pat.tryMatchRead(strr, "identifier");
if(tok!=null)
{
	...
}

or:
SyntaxParser parse = new SyntaxParser(strr, pat);
tok=parse.tryMatchRead("identifier");
if(tok!=null)
{
	...
}
tok=parse.tryMatchRead("integer");
if(tok!=null)
{
	...
}


granted, yes, all this is probably something a bit different than using 
regexes, but oh well.


or something...