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#!/usr/bin/perl -s
use v5.16;
use Test2::V0;
use experimental qw(signatures postderef);
our ($tests, $examples);
run_tests() if $tests || $examples; # does not return
die <<EOS unless @ARGV;
usage: $0 [-examples] [-tests] [TIME]
-examples
run the examples from the challenge
-tests
run some tests
TIME
incomplete time string containing one question mark at a digit position.
EOS
### Input and Output
say missing(shift);
### Implementation
sub missing ($t) {
# For each position of the question mark define a list of
# regex-value pairs that provide the maximum value that may replace
# the question mark if the regex matches.
state $match = [
[[qr/^.[4-9]/, 1], [qr//, 2]],
[[qr/^2/, 3], [qr//, 9]],
undef,
[[qr//, 5]],
[[qr//, 9]]];
# Apply the patterns in the list for the question mark's position
# and return the respective value for a match.
$t =~ $_->[0] && return $_->[1] for $match->[index($t, '?')]->@*;
}
### Examples and tests
sub run_tests {
SKIP: {
skip "examples" unless $examples;
is missing('?5:00'), 1, 'example 1';
is missing('?3:00'), 2, 'example 2';
is missing('1?:00'), 9, 'example 3';
is missing('2?:00'), 3, 'example 4';
is missing('12:?5'), 5, 'example 5';
is missing('12:5?'), 9, 'example 6';
}
SKIP: {
skip "tests" unless $tests;
}
done_testing;
exit;
}
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