39 lines
1.1 KiB
Perl
39 lines
1.1 KiB
Perl
package DDG::Goodie::Palindrome;
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# ABSTRACT: Return if the a string is a palindrome, formatted requests:
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# 'is <string> a[n] palindrome[?]' or 'isPalindrome <string>'
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use strict;
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use DDG::Goodie;
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triggers any => 'palindrome';
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zci is_cached => 1;
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primary_example_queries 'is a dank, sad nap. eels sleep and ask nada. a palindrome?';
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secondary_example_queries 'is foo a palindrome?', 'is dad a palindrome?';
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description 'check if a given string is a palindrome';
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name 'Palindrome';
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code_url 'https://github.com/duckduckgo/zeroclickinfo-goodies/blob/master/lib/DDG/Goodie/Palindrome.pm';
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category 'language';
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topics 'words_and_games';
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handle query => sub {
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#Remove the trigger text from the query.
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return unless /^(?:is\s+|)(.*?)\s+an?\s*palindrome\??$/i;
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my $palindrome = $1;
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my $is_palindrome = 0;
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# Clean up.
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my $clean_palindrome = lc $palindrome;
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$clean_palindrome =~ s/[^a-z0-9]+//g;
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$is_palindrome = 1 if $clean_palindrome eq scalar reverse $clean_palindrome;
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#Check to see if it is a palindrome.
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return $is_palindrome ? qq("$palindrome" is a palindrome.) : qq("$palindrome" is not a palindrome.);
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};
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1;
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