86 lines
2.7 KiB
Perl
86 lines
2.7 KiB
Perl
package DDG::Goodie::ReverseResistorColours;
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#ABSTRACT: Do the reverse of what ResistorColors.pm does.
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use strict;
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use DDG::Goodie;
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use utf8;
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triggers query_raw => qr/^resistors?|resistors?$/i;
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zci is_cached => 1;
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zci answer_type => 'ohms';
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my %coloursToDigits = (
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'black' => { value => 0, tolerance => '' },
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'brown' => { value => 1, tolerance => 1, },
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'red' => { value => 2, tolerance => 2 },
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'orange' => { value => 3, tolerance => '' },
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'yellow' => { value => 4, tolerance => 5 },
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'green' => { value => 5, tolerance => .5 },
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'blue' => { value => 6, tolerance => .25 },
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'violet' => { value => 7, tolerance => .1 },
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'grey' => { value => 8, tolerance => .05 },
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'white' => { value => 9, tolerance => '' },
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'gold' => { value => '-1', tolerance => 5 },
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'silver' => { value => '-2', tolerance => 10 },
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);
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handle query_raw => sub {
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s/gray/grey/g; #learn how to spell 'grey' right
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s/purple/violet/g; #because we can say both
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s/ ?resistors? ?//;
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my $count = 0;
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my $resistance = 0;
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my @colours = (split(' ', $_));
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my $marginE = 0;
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my $append = '';
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if ((scalar(@colours) != 3) && (scalar(@colours) != 4)) { return };
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foreach my $colour (@colours) {
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if (!exists $coloursToDigits{$colour}) { return };
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}
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$resistance += ($coloursToDigits{$colours[0]}{value} * 10);
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$resistance += $coloursToDigits{$colours[1]}{value};
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$resistance = $resistance * (10 ** $coloursToDigits{$colours[2]}{value});
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if (exists $colours[3]) {
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$marginE = $coloursToDigits{$colours[3]}{tolerance};
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} else {
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$marginE = 20;
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}
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if ($resistance > 1000 && $resistance < 999999) {
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$resistance = $resistance / 1000;
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$append = 'k';
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}
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if ($resistance > 1000000 && $resistance < 999999999) {
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$resistance = $resistance / 1000000;
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$append = 'M';
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}
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if ($resistance > 1000000000) {
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$resistance = $resistance / 1000000000;
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$append = "G";
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}
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#U+2126 is the ohm symbol, U+00B1 is the plus-minus sign.
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my $title = "$resistance $append\x{2126} \x{00B1} $marginE\%";
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my $subtitle = "Resistance of $_ resistor";
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my $answer = "A $_ resistor has a resistance of $title";
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return $answer,
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structured_answer => {
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data => {
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title => $title,
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subtitle => $subtitle
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},
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meta => {
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sourceName => "Wikipedia",
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sourceUrl => "https://en.wikipedia.org/wiki/Electronic_color_code",
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},
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templates => {
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group => 'text',
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options => {
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moreAt => 1,
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}
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}
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};
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};
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1;
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