459093dba9
Since the first versions of RevBank, negative and huge amounts are handled centrally, and since v2 (2013) they've been implemented through an exception that caused the pending transaction to be aborted. Since v3 (2019), RevBank has had a retry mechanism for rejected input to improve the user experience, but it required a REJECT return message from a plugin, not an exception. Now there's an exception class to trigger the same semantics.
80 lines
2.4 KiB
Perl
80 lines
2.4 KiB
Perl
package RevBank::Global;
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use v5.32;
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use warnings;
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use experimental 'signatures'; # stable since v5.36
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use POSIX qw(strftime);
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use RevBank::Amount;
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use RevBank::FileIO;
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{
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package RevBank::Exception::RejectInput;
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sub new($class, $reason) { return bless \$reason, $class; }
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sub reason($self) { return $$self; }
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}
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sub import {
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require RevBank::Plugins;
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require RevBank::Users;
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no strict 'refs';
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my $caller = caller;
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*{"$caller\::ACCEPT"} = sub () { \1 };
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*{"$caller\::ABORT"} = sub () { \2 };
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*{"$caller\::REJECT"} = sub () { \3 };
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*{"$caller\::NEXT"} = sub () { \4 };
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*{"$caller\::DONE"} = sub () { \5 };
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*{"$caller\::REDO"} = sub () { \6 };
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*{"$caller\::slurp"} = \&RevBank::FileIO::slurp;
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*{"$caller\::spurt"} = \&RevBank::FileIO::spurt;
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*{"$caller\::rewrite"} = \&RevBank::FileIO::rewrite;
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*{"$caller\::append"} = \&RevBank::FileIO::append;
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*{"$caller\::with_lock"} = \&RevBank::FileIO::with_lock;
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*{"$caller\::parse_user"} = \&RevBank::Users::parse_user;
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*{"$caller\::parse_amount"} = sub ($amount) {
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defined $amount or return undef;
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length $amount or return undef;
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my @split = grep /\S/, split /([+-])/, $amount;
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my $posneg = 1;
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$amount = RevBank::Amount->new(0);
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for my $token (@split) {
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if ($token eq '-') {
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$posneg = $posneg == -1 ? 1 : -1;
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} elsif ($token eq '+') {
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$posneg ||= 1;
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} else {
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$posneg or return undef; # two terms in a row
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my $term = RevBank::Amount->parse_string($token) // return undef;
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$amount += $posneg * $term;
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$posneg = 0;
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}
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}
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$posneg and return undef; # last token must be term
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if ($amount->cents < 0) {
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die RevBank::Exception::RejectInput->new(
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"For our sanity, no negative amounts, please :)."
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);
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}
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if ($amount->cents > 99900) {
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die RevBank::Exception::RejectInput->new(
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"That's way too much money."
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);
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}
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return $amount;
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};
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*{"$caller\::call_hooks"} = \&RevBank::Plugins::call_hooks;
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*{"$caller\::say"} = sub {
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print @_, "\n";
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};
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*{"$caller\::now"} = sub () {
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return strftime '%Y-%m-%d_%H:%M:%S', localtime;
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};
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}
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__PACKAGE__->import;
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1;
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