Challenge 184 task 1

1 files changed, 64 insertions, 0 deletions

diff --git a/challenge-184/jo-37/perl/ch-1.pl b/challenge-184/jo-37/perl/ch-1.pl
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+++ b/challenge-184/jo-37/perl/ch-1.pl
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+#!/usr/bin/perl -s
+
+use v5.24;
+use Test2::V0;
+
+our ($tests, $examples);
+
+run_tests() if $tests || $examples;	# does not return
+
+die <<EOS unless @ARGV;
+usage: $0 [-examples] [-tests] [STRING...]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+STRING
+    list of strings
+
+EOS
+
+
+### Input and Output
+
+say "(@{[sequence_number(@ARGV)]})";
+
+
+### Implementation
+
+# It is not clear how to maintain prefixes that come out of order.  In
+# the examples the prefixes are simply replaced with a two-digit number.
+sub sequence_number {
+	my $seq = 0;
+    map s/^[a-z]{2}(?=\d+$)/sprintf "%02d", $seq++/er, @_;
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+
+        is [sequence_number('ab1234', 'cd5678', 'ef1342')],
+            ['001234', '015678', '021342'], 'example 1';
+
+        is [sequence_number('pq1122', 'rs3334')],
+            ['001122', '013334'], 'example 2';
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+
+        is [sequence_number('112233')], ['112233'], 'no prefix';
+        is [sequence_number('abc123')], ['abc123'], 'prefix too long';
+        is [sequence_number('ab')], ['ab'], 'no suffix';
+
+	}
+
+    done_testing;
+    exit;
+}