@database = (
{ name => "Wild Ginger",
city => "Seattle",
cuisine => "Asian Thai Chinese Korean Japanese",
expense => 4,
music => "\0",
meals => "lunch dinner",
view => "\0",
smoking => "\0",
parking => "validated",
rating => 4,
payment => "MC VISA AMEX",
},
# { ... }, etc.
);
sub findRestaurants {
my ($database, $query) = @_;
return grep {
$query->{city} ?
lc($query->{city}) eq lc($_->{city}) : 1
and $query->{cuisine} ?
$_->{cuisine} =~ /$query->{cuisine}/i : 1
and $query->{min_expense} ?
$_->{expense} >= $query->{min_expense} : 1
and $query->{max_expense} ?
$_->{expense} <= $query->{max_expense} : 1
and $query->{music} ? $_->{music} : 1
and $query->{music_type} ?
$_->{music} =~ /$query->{music_type}/i : 1
and $query->{meals} ?
$_->{meals} =~ /$query->{meals}/i : 1
and $query->{view} ? $_->{view} : 1
and $query->{smoking} ? $_->{smoking} : 1
and $query->{parking} ? $_->{parking} : 1
and $query->{min_rating} ?
$_->{rating} >= $query->{min_rating} : 1
and $query->{max_rating} ?
$_->{rating} <= $query->{max_rating} : 1
and $query->{payment} ?
$_->{payment} =~ /$query->{payment}/i : 1
} @$database;
}
%query = ( city => 'Seattle', cuisine => 'Asian|Thai' );
@restaurants = findRestaurants(\@database, \%query);
print "$restaurants[0]->{name}\n";
输出结果: Wild Ginger
