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package Parse::SpectrumDirect::RadioFrequency; |
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26227
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use warnings; |
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use strict; |
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use 5.008; |
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=head1 NAME |
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Parse::SpectrumDirect::RadioFrequency - Parse Industry Canada "Spectrum Direct" radio frequency search output |
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=head1 VERSION |
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Version 0.100 |
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=cut |
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our $VERSION = '0.100'; |
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=head1 DESCRIPTION |
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This module provides a parser for the "Radio Frequency Search" text-format |
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output from Industry Canada's Spectrum Direct service. This service provides |
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information on the location of RF spectrum licensing, transmitter locations, |
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etc. |
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The service is available at http://www.ic.gc.ca/eic/site/sd-sd.nsf/eng/home |
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The text export is a series of fixed-width fields, with field locations and |
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descriptions present in a legend at the end of the data file. |
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=head1 SYNOPSIS |
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my $parser = Parse::SpectrumDirect::RadioFrequency->new(); |
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$parser->parse( $prefetched_output ); |
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my $legend_hash = $parser->get_legend(); |
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my $stations = $parser->get_stations(); |
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=head1 METHODS |
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=over 4 |
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=item new ( ) |
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Creates a new parser. |
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=cut |
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sub new |
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{ |
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my ($class) = @_; |
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return bless({},$class); |
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} |
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=item parse ( $raw ) |
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Parses the raw data provided. Returns a true value if successful, a false if |
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not. |
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Parsed data can be obtained with get_legend() and get_stations() (see below). |
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=cut |
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sub parse |
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{ |
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1
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my ($self, $raw) = @_; |
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delete $self->{legend}; |
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delete $self->{stations}; |
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71
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100
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return undef unless $raw; |
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73
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2
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100
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if( ! $self->_extract_legend( $raw ) ) { |
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delete $self->{legend}; |
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1
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return undef; |
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} |
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1
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if( ! $self->_extract_stations( $raw ) ) { |
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delete $self->{legend}; |
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delete $self->{stations}; |
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return undef; |
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} |
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1
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return 1; |
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} |
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=item get_legend () |
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Returns the description of fields as parsed from the input data. |
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Return value is an array reference containing one hash reference per field. |
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Each hashref contains: |
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=over 4 |
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=item name |
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98
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As in source legend, stripped of trailing spaces |
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100
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=item units |
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102
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Units for data value, if determinable from legend. |
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104
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=item key |
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106
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Key used in station hashes. Generated from name stripped of unit information, and whitespaces converted to _. |
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108
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=item start |
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Column index to start extracting data value |
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112
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=item len |
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114
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Column width, used for data extraction. |
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116
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=back |
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=cut |
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120
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sub get_legend |
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{ |
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my ($self) = @_; |
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return $self->{legend}; |
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} |
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126
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=item get_stations () |
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128
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Returns station information as parsed from the input data. |
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130
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=back |
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=cut |
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134
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sub get_stations |
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{ |
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1
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2246
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my ($self) = @_; |
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18
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return $self->{stations}; |
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} |
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140
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# Extract legend as an arrayref of hashrefs. |
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sub _extract_legend |
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{ |
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my ($self, $raw) = @_; |
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145
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my ($raw_legend) = $raw =~ m/Field Position Legend(.*)/sm; |
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2
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100
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return undef unless $raw_legend; |
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148
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1
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$self->{legend} = []; |
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1
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foreach my $line (split(/\n/, $raw_legend)) { |
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# Lines are in the format of: |
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# name start - end |
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# with the columns starting at 1. |
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155
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my ($name, $start, $end) = $line =~ m/(.*?)\s+(\d+) - (\d+)/; |
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100
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next unless $name; |
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$name =~ s/\s+$//; |
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159
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# Pull off units |
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my $units = undef; |
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if( $name =~ m/\((.*?)\)$/ ) { |
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$units = $1; |
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} |
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165
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my $key = $name; |
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$key =~ s/\(.*?\)//g; |
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$key =~ s/\s+$//; |
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$key =~ s/\s+/_/g; |
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170
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329
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my $col = { |
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key => $key, |
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units => $units, |
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name => $name, |
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start => $start - 1, |
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len => $end - $start + 1, |
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}; |
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84
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push @{$self->{legend}},$col; |
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210
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178
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179
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} |
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181
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1
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return $self->{legend}; |
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} |
183
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184
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# Return station data as an arrayref of hashrefs, one per row. |
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sub _extract_stations |
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{ |
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my ($self, $raw) = @_; |
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189
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1
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590
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my ($data) = $raw =~ m/\[DATA\](.*)\[\/DATA\]/sm; |
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1
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4
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return undef unless $data; |
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192
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1
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3
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my $regex = join('\s', map { "(.{$_->{len},$_->{len}})" } @{$self->{legend}} ); |
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4
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193
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my @key_ary = map { $_->{key} } @{$self->{legend}}; |
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100
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194
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195
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1
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$self->{stations} = []; |
196
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1
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1067
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foreach my $line (split(/\n/,$data)) { |
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415
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16576
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my (@tmprow) = $line =~ /$regex/o; |
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199
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415
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1535
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my %row; |
200
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415
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1244
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@row{@key_ary} = map { s/^\s+|\s+$//g; $_ } @tmprow; |
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84512
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28566
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64892
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201
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415
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3190
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push @{$self->{stations}}, \%row; |
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415
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3564
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} |
203
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1
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100
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$self->_fixup_station_data(); |
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205
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1
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return $self->{stations}; |
206
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} |
207
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208
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# Fix some common stupidity with station data |
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sub _fixup_station_data |
210
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{ |
211
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1
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1
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3
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my ($self) = @_; |
212
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213
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214
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# Convert to decimal degrees from ddmmss. Also, force |
215
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# longitude to west (negative), since this is Canada we're |
216
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# dealing with. |
217
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1
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3
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foreach my $s (@{$self->{stations}}) { |
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1
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3
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218
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415
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50
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1253
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$s->{Latitude} = _dd_from_dms( $s->{Latitude} ) if exists $s->{Latitude}; |
219
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415
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50
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1117
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$s->{Longitude} = 0 - _dd_from_dms( $s->{Longitude} ) if exists $s->{Longitude}; |
220
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} |
221
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222
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# Change units in legend, too |
223
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1
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3
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foreach my $l (@{$self->{legend}}) { |
|
1
|
|
|
|
|
4
|
|
224
|
69
|
100
|
|
|
|
165
|
if( $l->{key} =~ /^(?:Latitude|Longitude)$/ ) { |
225
|
2
|
|
|
|
|
5
|
$l->{units} = 'decimal degrees'; |
226
|
|
|
|
|
|
|
} |
227
|
|
|
|
|
|
|
} |
228
|
|
|
|
|
|
|
} |
229
|
|
|
|
|
|
|
|
230
|
|
|
|
|
|
|
sub _dd_from_dms |
231
|
|
|
|
|
|
|
{ |
232
|
830
|
|
|
830
|
|
933
|
my ($dms) = @_; |
233
|
|
|
|
|
|
|
|
234
|
830
|
100
|
|
|
|
1283
|
return 0.0 unless $dms; |
235
|
|
|
|
|
|
|
|
236
|
816
|
|
|
|
|
819
|
my $ss = substr( $dms, -2, 2, ''); |
237
|
816
|
|
|
|
|
719
|
my $mm = substr( $dms, -2, 2, ''); |
238
|
816
|
|
|
|
|
684
|
my $dd = $dms; |
239
|
|
|
|
|
|
|
|
240
|
816
|
|
|
|
|
10391
|
return sprintf('%.6f', $dd + ($mm * 60 + $ss)/3600); |
241
|
|
|
|
|
|
|
} |
242
|
|
|
|
|
|
|
|
243
|
|
|
|
|
|
|
|
244
|
|
|
|
|
|
|
1; |
245
|
|
|
|
|
|
|
__END__ |