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AddTrigger doesn't add when regexp

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Posted by Yasik   Ukraine  (14 posts)  [Biography] bio
Date Tue 05 Jul 2011 01:49 PM (UTC)
Message
Greetings!

I've been reading the Forum for 2 days as for now and I guess I was looking good and long enough to find an answer to my question if there's was one, but it seems like there isn't...

The alias (nothing much):

<aliases>
<alias
script="zzz"
match="re-ssk"
enabled="y"
send_to="12"
sequence="100"
>
</alias>
</aliases>

The script code (PerlScript):

sub zzz {
my ($thename, $theoutput, $wildcards) = @_;
my $z;
$z = $world->AddTrigger ("re__ssk", "You feel less protected.", "cast 'Stone Skin'", 1025, -1, 0, "", "");
$world->Note ($z);
};

The above does work. The below - doesn't.

sub zzz {
my ($thename, $theoutput, $wildcards) = @_;
my $z;
$z = $world->AddTrigger ("re__ssk", "^You feel less protected\.$", "cast 'Stone Skin'", 1057, -1, 0, "", "");
$world->Note ($z);
};

Flags: 1025 - replace exisiting with same name and enabled, 1057 - same as before + regexp.
Perl 5.14.1 build 1401.

The error mesassage:

Script error
World: SLOTH
Execution of line 1 column 0
Immediate execution
Compilation error
Error context in script:
1*: sub zzz {
2 : my ($thename, $theoutput, $wildcards) = @_;
3 : my $z;
4 : $z = $world->AddTrigger ("re__ssk", "^You feel less protected\.$", "cast 'Stone Skin'", 1057, -1, 0, "", "");
5 : $world->Note ($z);

Can post Debug ("summary") if needed.

How do I make this work? I'm totally confused. Thanks in advance.
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Posted by Nick Gammon   Australia  (21,322 posts)  [Biography] bio   Forum Administrator
Date Reply #1 on Tue 05 Jul 2011 09:33 PM (UTC)

Amended on Tue 05 Jul 2011 09:34 PM (UTC) by Nick Gammon

Message

"^You feel less protected\.$"


My guess here is the backslash, which is one of the few things you changed. You put it there I presume so you would escape the period. But in PHP a backslash inside quotes would have another meaning, and it probably objects to backslash-dot.

Try two backslashes.

The message is "Compilation error" which means something to do with PHP syntax, not to do with how MUSHclient treats regular expressions.

- Nick Gammon

www.gammon.com.au, www.mushclient.com
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Posted by Yasik   Ukraine  (14 posts)  [Biography] bio
Date Reply #2 on Wed 06 Jul 2011 04:31 PM (UTC)
Message
After few experiments, I have found out that an expression between two quotes is actually an regexp-in-regexp.
I should escape a dot, escape a slash escaping a dot and escape a slash escaping a slash escaping a dot. And escape an $ sign. No joking. The setup that actually worked as I want it to is as follow:

ALIAS:

<aliases>
<alias
script="zzz"
match="re-ssk"
enabled="y"
send_to="12"
sequence="100"
>
</alias>
</aliases>

SCRIPT:

sub zzz {
my $z;
$z = $world->AddTrigger ("re__ssk", "^You feel less protected\\\.\$", "cast 'Stone Skin'", 1057, -1, 0, "", "");
$world->Note ($z);
};

TRIGGER ADDED:

<triggers>
<trigger
enabled="y"
match="^You feel less protected\.$"
name="re__ssk"
regexp="y"
sequence="100"
variable="re__ssk"
>
<send>cast 'Stone Skin'</send>
</trigger>
</triggers>

Now it consist of "^", "\." and "$".
Thanks for leading me to the root of the problem :)
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Posted by Nick Gammon   Australia  (21,322 posts)  [Biography] bio   Forum Administrator
Date Reply #3 on Wed 06 Jul 2011 10:07 PM (UTC)
Message
Oh yeah I'd forgotten that the $ has meaning in PHP.

I'm a bit surprised about the 3rd backslash. You don't really have a regexp-in-regexp, you have a regexp inside a string. First you need to defeat PHP's treating of special character like backslashes and dollar signs, and then the rexexp matcher itself has to get \. in order to process that as a single dot (and not a "match-all" character).

- Nick Gammon

www.gammon.com.au, www.mushclient.com
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Posted by Yasik   Ukraine  (14 posts)  [Biography] bio
Date Reply #4 on Thu 07 Jul 2011 04:27 AM (UTC)
Message
I think its because we dont have to enter a regexp in the AddTrigger function as we would enter it in the Add Trigger dialogue menu, but instead we should enter a string that will be processed and the result of this processing will be entered in the Configuration->Triggers->Edit Trigger->Trigger box when the function launches.
This way, in order to have a \.$ we had to escape a backslash, a dot and a $ sign : \\\.\$
Still i dont get it why ^ without escaping is ok if it works that way.
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Posted by Nick Gammon   Australia  (21,322 posts)  [Biography] bio   Forum Administrator
Date Reply #5 on Thu 07 Jul 2011 05:21 AM (UTC)
Message
The ^ has no special meaning to PHP, so it didn't need to be escaped. Both $ and \ do.

As I recall, in PHP if you used single quotes you wouldn't have to escape the $. This is because inside double quotes something like "$foo" means "the contents of the variable "foo".

- Nick Gammon

www.gammon.com.au, www.mushclient.com
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