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support simple arithmetic (only + and -) for monetary amounts

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This commit is contained in:
Juerd Waalboer 2023-12-25 00:33:46 +01:00
parent 3470ebeb1c
commit 3dab71fdbf
3 changed files with 77 additions and 2 deletions
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21
lib/RevBank/Global.pm
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@ -29,7 +29,26 @@ sub import {
defined $amount or return undef;
length $amount or return undef;
$amount = RevBank::Amount->parse_string($amount) // return undef;
my @split = grep /\S/, split /([+-])/, $amount;
my $posneg = 1;
$amount = RevBank::Amount->new(0);
for my $token (@split) {
if ($token eq '-') {
$posneg = $posneg == -1 ? 1 : -1;
} elsif ($token eq '+') {
next if $posneg == -1; # -+
$posneg ||= 1;
next;
} else {
$posneg or return undef; # two terms in a row
my $term = RevBank::Amount->parse_string($token) // return undef;
$amount += $posneg * $term;
$posneg = 0;
}
}
$posneg and return undef; # last token must be term
if ($amount->cents < 0) {
die "For our sanity, no negative amounts, please :).\n";
}