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why "abc" / "abcd" doesn't match "abcd" ???
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Iñaki Baz Castillo  
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 More options Mar 19 2008, 6:20 am
From: "Iñaki Baz Castillo" <i...@aliax.net>
Date: Wed, 19 Mar 2008 11:20:59 +0100
Local: Wed, Mar 19 2008 6:20 am
Subject: why "abc" / "abcd" doesn't match "abcd" ???
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Hi, I'm very annoyed, why the following rule doesn't match "abcd"?

        rule request
                'abc' / 'abcd'
        end

I've discovered that I must use:

        rule request
                'abcd' / 'abc'
        end

This is: the longest match first.

Please, any reason for this? is it pointed somewhere in the doc?

Thanks a lot.

--
Iñaki Baz Castillo
<i...@aliax.net>


 
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Martin Gamsjaeger  
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 More options Mar 19 2008, 10:40 am
From: "Martin Gamsjaeger" <gamsnj...@gmail.com>
Date: Wed, 19 Mar 2008 15:40:59 +0100
Local: Wed, Mar 19 2008 10:40 am
Subject: Re: why "abc" / "abcd" doesn't match "abcd" ???
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Hi Iñaki,

Taken from treetop website:

Parsers attempt to match ordered choices in left-to-right order, and
stop after the first successful match.

"foobar" / "foo" / "bar"

Note that if "foo" in the above expression came first, "foobar" would
never be matched.

cheers
Martin

On Wed, Mar 19, 2008 at 11:20 AM, Iñaki Baz Castillo <i...@aliax.net> wrote:


 
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Iñaki Baz Castillo  
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 More options Mar 19 2008, 10:51 am
From: "Iñaki Baz Castillo" <i...@aliax.net>
Date: Wed, 19 Mar 2008 15:51:01 +0100
Local: Wed, Mar 19 2008 10:51 am
Subject: Re: why "abc" / "abcd" doesn't match "abcd" ???
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2008/3/19, Martin Gamsjaeger <gamsnj...@gmail.com>:

> Hi Iñaki,

>  Taken from treetop website:

>  Parsers attempt to match ordered choices in left-to-right order, and
>  stop after the first successful match.

>  "foobar" / "foo" / "bar"

>  Note that if "foo" in the above expression came first, "foobar" would
>  never be matched.

Opss, nice point. Thanks a lot, it's clear now.

--
Iñaki Baz Castillo
<i...@aliax.net>


 
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