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package LBMA::Statistics::SilverFixing::Daily; |
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use warnings; |
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use strict; |
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our $VERSION = '0.061'; |
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use WWW::Mechanize; |
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use HTML::TableExtract; |
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use Encode; |
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use Log::Log4perl qw/:easy/; |
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=head1 NAME |
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LBMA::Statistics::SilverFixing::Daily - Daily Prices Silver Fixings London Bullion Market (Internal only) |
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=head1 DESCRIPTION |
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Does the hard work. |
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=head1 SYNOPSIS |
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This modul is for internal use only. There's no need to use it directly. |
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Everthing is done by LBMA::Statistics (See L). |
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=head2 new - Constructor |
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use strict; |
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use warnings; |
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use LBMA::Statistics::SilverFixing::Daily; |
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my $lbma = LBMA::Statistics::GoldFixing::Daily->new( |
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year => $year, |
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day_pattern => $day_pattern |
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) or die $!; |
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=cut |
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sub new { |
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my $class = shift; |
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my $self = {}; |
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bless $self, $class; |
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$self->_init(@_); |
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return $self; |
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} |
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=head2 _init |
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private method to initialize the object |
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=cut |
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sub _init { |
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my $self = shift; |
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my %args = @_; |
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$self->{year} = $args{year}; |
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$self->{day_pattern} = $args{day_pattern}; |
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LOGDIE "Missing mandantory parameter year" unless $self->{year}; |
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LOGDIE "Missing mandantory parameter day_pattern" |
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unless $self->{day_pattern}; |
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} |
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=head2 year |
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returns the year to look for |
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=cut |
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sub year { |
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my $self = shift; |
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return $self->{year}; |
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} |
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=head2 day_pattern |
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returns the day_pattern to look for |
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=cut |
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sub day_pattern { |
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my $self = shift; |
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return $self->{day_pattern}; |
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} |
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=head2 dailystatsurl |
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determines url for daily silverstats |
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=cut |
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sub dailystatsurl { |
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my $self = shift; |
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my $url = 'http://lbma.oblive.co.uk/table?metal=silver&year='; |
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$url .= $self->year(); |
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$url .= '&type=daily'; |
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DEBUG("url: $url"); |
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return $url; |
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} |
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=head2 retrieve_row |
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Returns an array of fixings |
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The number and order of elements varies depending on the year data is retrieved. |
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There is no EUR before 1999. |
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# @fixings 1999 -- |
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# 0 date |
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# 1 SILVER USD |
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# 2 SILVER GBP |
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# 3 SILVER EUR |
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# |
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# @fixings 1968 -- 1998 |
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# 0 date |
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# 1 SILVER USD |
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# 2 SILVER GBP |
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=cut |
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sub retrieve_row { |
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my $self = shift; |
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my $url = $self->dailystatsurl(); |
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my $browser = WWW::Mechanize->new( |
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stack_depth => 0, |
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autocheck => 1, |
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) or LOGDIE $!; |
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$browser->agent_alias('Windows IE 6'); # Hide crawler |
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$browser->get($url) or LOGDIE $!; |
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my $fixings = $self->_parse( $browser->content() ); |
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{ |
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15130
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no warnings; |
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3195
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foreach my $fixing ( @$fixings ) { |
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TRACE("Fixing: $fixing"); |
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} |
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} |
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return wantarray ? @$fixings : $fixings; |
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} |
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=head2 _parse |
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parses the content of the retrieved HTML page |
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=cut |
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sub _parse { |
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my $self = shift; |
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my $content = shift @_; |
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$content = decode_utf8($content); |
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my $day_pattern = $self->day_pattern(); |
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my @fixings = (); |
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my $te = HTML::TableExtract->new() or LOGDIE $!; |
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$te->parse($content) or LOGDIE $!; |
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319223
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TABLE: foreach my $ts ( $te->tables ) { |
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ROW: foreach my $row ( $ts->rows ) { |
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next ROW unless defined @$row[0]; |
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{ |
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102
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no warnings; |
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37
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15
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1997
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274
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293
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274
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858
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TRACE( "Current Row: ", join( "|", @$row ) ); |
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} |
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2241
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next ROW unless @$row[0] =~ m/$day_pattern/; |
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@fixings = @$row; |
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last TABLE; |
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} |
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} |
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801
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return wantarray ? @fixings : \@fixings; |
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} |
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1; |
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__END__ |