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Re: Re: Re: Daft text adventure project

by swiftone (Curate)
on May 31, 2001 at 00:10 UTC ( #84362=note: print w/replies, xml ) Need Help??


in reply to Re: Re: Daft text adventure project
in thread Daft text adventure project

So I'm determined to do it the hard way, so that at the end (if there is an end),

Doing it the hard way is a time-honored tradition :) I just suggested you check out how the others work so that you can steal good ideas & interfaces.

is the long string in your penultimate line a single scalar for all purposes?

You mean $character{'Bob the Fighter'}->{'Attributes'}->{'Str'}? Yes, because in the end it is just a value stored in a hash, and only scalars can be thus stored. By dereferencing part of that mess, you can get a hash. For example, %{ $character{'Bob the Fighter'}->{'Attributes'} } is the Attributes hash. (The scalar value $characters{'Bob the Fighter'}->{'Attributes'} is a reference to a hash. the %{ } dereferences the reference.

Could I include lists in that hash by reference?

Absolutely. A reference to anything is a scalar, and a hash can store a scalar. An anonymous list can be created by [], or you can use the backslash reference. So:

$characters{'Bob the Fighter'}->{'Feats'}= [ 'Strong Spit', 'Perl Guru +']; # or @feats = ('Strong Spit', 'Perl Guru'); $characters{'Bob the Fighter'}->{'Feats'} = \@feats;
both work just fine. You can then access them like:
$characters{'Bob the Fighter'}->{'Feats'}->[1]; #is equal to 'Perl Guru'
Remember that although we're using a hash as our "base" variable here, we could use any other data type that is appropriate. A list could work:
$characters[3]->{'Attributes'}->{'Str'};
as could a scalar:
$characters->{'Bob the Fighter'}->{'Attributes'}->{'Str'};
(Assuming you had stored the data in that fashion.)

If, for example, $character{'Bob'}->{'Class'} holds 'Ftr', and $class{'Ftr'}->{'Base Attack'} holds 'Good' (to indicate that fighters have Good attack bonuses, which are generated by a short procedure in the combat module), what would be the code to retrieve Bob's Base Attack type?

Well, $class{$character{'Bob'}->{'class'}}->{'Base Attack'} would be equal to $class{'Ftr'->{'Base Attack'} (actually, it would _BE_ the same, since all that happens is $character{'Bob'}->{'Class'} resolves to 'Ftr') However, this assumes that Bob's class will ALWAYS have an entry in %class.

Storing feats, spells, etc. as booleans is not efficient, IMHO. I want to be able to brew a new feat and not have to go and set the bit in all the PCs.)

Just so you know, Perl handles non-existant hash keys quite nicely, and it's quite common to see code that would be like:

if($char{Bob}->{Feats}->{'Good With Pointy Objects'}){ Kill_Bad_Guy(); } else { Die_Hideous_Death(); }
If Bob doesn't have that feat, you don't have to set it to 0, you simply don't set it to a true value, and it will evaluate False. (Well, undefined, which in turn is false)

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