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##################################################################
## OsmReader.pm - Library for reading OSM files ##
## By Martijn van Oosterhout <kleptog@svana.org> ##
## ##
## Package that reads both OSM file format files. ##
## The user creates the parse with a callback and the ##
## loader will call the callback for each detected object. ##
## Licence: LGPL ##
##################################################################
package Geo::OSM::OsmReader;
use strict;
use warnings;
use Utils::File;
use Utils::Math;
use Utils::Debug;
use XML::Parser;
use Carp;
use Geo::OSM::EntitiesV3;
use constant STATE_INIT => 1;
use constant STATE_EXPECT_ENTITY => 3;
use constant STATE_EXPECT_BODY => 4;
# With this initialiser, your process will get called with instantiated objects
sub init
{
my $obj = bless{}, shift;
my $proc = shift;
my $prog = shift;
if( ref $proc ne "CODE" )
{ die "init Geo::OSM::OsmReader requires a sub as argument\n" }
$obj->{newproc} = $proc;
if( defined $prog )
{ $obj->{progress} = $prog }
return $obj;
}
sub _process
{
my($self, $entity, $attr, $tags, $members) = @_;
my $ent;
if( $entity eq "node" )
{
$ent = new Geo::OSM::Node( $attr, $tags );
}
if( $entity eq "segment" )
{
$ent = new Geo::OSM::Segment( $attr, $tags );
}
if( $entity eq "way" )
{
$ent = new Geo::OSM::Way( $attr, $tags, $members );
}
croak "Unknown entity '$entity'" if not defined $ent;
return $self->{newproc}->( $ent );
}
sub load($)
{
my ($self, $file_name) = @_;
$self->{state} = STATE_INIT;
my $start_time = time();
my $P = new XML::Parser(Handlers => {Start => sub{ DoStart( $self, @_ )}, End => sub { DoEnd( $self, @_ )}});
my $fh = data_open($file_name);
die "Cannot open OSM File $file_name\n" unless $fh;
$self->{input_length} = -s $fh;
$self->{count}=0;
eval {
$P->parse($fh);
};
print "\n" if $DEBUG || $VERBOSE;
if ( $VERBOSE) {
printf "Read and parsed $file_name in %.0f sec\n",time()-$start_time;
}
if ( $@ ) {
warn "$@Error while parsing\n $file_name\n";
return;
}
if (not $P) {
warn "WARNING: Could not parse osm data\n";
return;
}
}
sub parse($)
{
my ($self, $string) = @_;
$self->{state} = STATE_INIT;
my $start_time = time();
my $P = new XML::Parser(Handlers => {Start => sub{ DoStart( $self, @_ )}, End => sub { DoEnd( $self, @_ )}});
$self->{input_length} = length($string);
$self->{count}=0;
eval {
$P->parse($string);
};
print "\n" if $DEBUG || $VERBOSE;
if ( $VERBOSE) {
printf "Read and parsed string in %.0f sec\n",time()-$start_time;
}
if ( $@ ) {
warn "$@Error while parsing\n [$string]\n";
return;
}
if (not $P) {
warn "WARNING: Could not parse osm data\n";
return;
}
}
# Function is called whenever an XML tag is started
sub DoStart
{
#print @_,"\n";
my ($self, $Expat, $Name, %Attr) = @_;
if( $self->{state} == STATE_INIT )
{
if($Name eq "osm"){
$self->{state} = STATE_EXPECT_ENTITY;
if( $Attr{version} ne "0.3" and $Attr{version} ne "0.4")
{ die "OsmReaderV5 can only read 0.3 or 0.4 files, found '$Attr{version}'\n" }
} else {
die "Expected 'osm' tag, got '$Name'\n";
}
}
elsif( $self->{state} == STATE_EXPECT_ENTITY )
{
# Pick up the origin attribute from the bound tag
if( $Name eq "bound" )
{
if( exists $Attr{origin} )
{
$self->{origin} = $Attr{origin};
}
return;
}
if($Name eq "node" or $Name eq "segment" or $Name eq "way"){
$self->{entity} = $Name;
$self->{attr} = {%Attr};
$self->{tags} = [];
$self->{members} = ($Name ne "node") ? [] : undef;
$self->{state} = STATE_EXPECT_BODY;
} else {
die "Expected entity\n";
}
}
elsif( $self->{state} == STATE_EXPECT_BODY )
{
if($Name eq "tag"){
push @{$self->{tags}}, $Attr{"k"}, $Attr{"v"};
}
if($Name eq "seg"){
push @{$self->{members}}, $Attr{"id"};
}
}
}
# Function is called whenever an XML tag is ended
sub DoEnd
{
my ($self, $Expat, $Name) = @_;
if( $self->{state} == STATE_EXPECT_BODY )
{
if( $Name eq $self->{entity} )
{
$self->_process( $self->{entity}, $self->{attr}, $self->{tags}, $self->{members} );
$self->{count}++;
if( $self->{progress} and ($self->{count}%11) == 1)
{
$self->{progress}->($self->{count}, $self->{input_length} ? $Expat->current_byte()/$self->{input_length} : $Expat->current_byte());
}
$self->{state} = STATE_EXPECT_ENTITY;
}
return;
}
elsif( $self->{state} == STATE_EXPECT_ENTITY )
{
return if $Name eq "bound";
if( $Name eq "osm" )
{
$self->{state} = STATE_INIT;
} else {die}
return;
}
}
1;
__END__
=head1 NAME
OsmReaderV3 - Module for reading OpenStreetMap V3 XML data files
=head1 SYNOPSIS
my $OSM = new Geo::OSM::OsmReader(\&process);
$OSM->load("Data/changes.osc");
sub process
{
my($OSM, $entity) = @_;
print "Read $entity ".$entity->id."\n";
my $tags = $entity->tags;
while( my($k,$v) = splice @{$tags}, 0, 2 )
{ print " $k: $v\n" }
if( $entity->type eq "way" )
{ print " Segs: ", join(", ",@{$entity->segs}),"\n"; }
}
=head1 AUTHOR
Martijn van Oosterhout <kleptog@svana.org>
based on OsmXML.pm written by:
Oliver White (oliver.white@blibbleblobble.co.uk)
=head1 COPYRIGHT
Copyright 2007, Martijn van Oosterhout
Copyright 2006, Oliver White
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
=cut
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