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package urpm::xml_info;
use strict;
use XML::LibXML::Reader;
# throw an exception on error
sub get_nodes {
my ($xml_info, $xml_info_file, $fullnames) = @_;
my $get_one_node = _get_one_node($xml_info);
_get_xml_info_nodes($xml_info_file, $get_one_node, $fullnames);
}
# throw an exception on error
sub do_something_with_nodes {
my ($xml_info, $xml_info_file, $do, $o_wanted_attributes) = @_;
my $get_one_node = _get_one_node($xml_info, $o_wanted_attributes);
_do_something_with_xml_info_nodes($xml_info_file, $get_one_node, $do);
}
sub open_lzma {
my ($xml_info_file) = @_;
$xml_info_file =~ s/'/'\\''/g;
open(my $F, "lzma -dc '$xml_info_file' |");
$F;
}
################################################################################
sub _open_xml_reader {
my ($xml_info_file) = @_;
my $reader = new XML::LibXML::Reader(IO => open_lzma($xml_info_file)) or die "cannot read $xml_info_file\n";
$reader->read;
$reader->name eq 'media_info' or die "global <media_info> tag not found\n";
$reader->read; # first tag
$reader;
}
sub _get_all_attributes {
my ($reader) = @_;
my %entry;
$reader->moveToFirstAttribute;
do {
$entry{$reader->name} = $reader->value;
} while $reader->moveToNextAttribute == 1;
\%entry;
}
sub _get_attributes {
my ($reader, $o_wanted_attributes) = @_;
if ($o_wanted_attributes) {
my %entry = map { $_ => $reader->getAttribute($_) } @$o_wanted_attributes;
\%entry;
} else {
_get_all_attributes($reader);
}
}
sub _get_simple_value_node {
my ($value_name, $o_wanted_attributes) = @_;
sub {
my ($reader) = @_;
my $entry = _get_attributes($reader, $o_wanted_attributes);
$reader->read; # get value
$entry->{$value_name} = $reader->value;
$entry->{$value_name} =~ s/^\n//;
$reader->read; # close tag
$reader->read; # open next tag
$entry;
};
}
sub _get_changelog_node {
my ($reader, $fn) = @_;
$reader->nextElement('log'); # get first <log>
my @changelogs;
my $time;
while ($time = $reader->getAttribute('time')) {
push @changelogs, my $e = { time => $time };
$reader->nextElement('log_name'); $reader->read;
$e->{name} = $reader->value;
$reader->nextElement('log_text'); $reader->read;
$e->{text} = $reader->value;
$reader->read; # </log_text>
$reader->read; # </log>
$reader->read; # <log>
$reader->read if $reader->readState != 0; # there may be SIGNIFICANT_WHITESPACE between </log_text> and </log>
}
{ fn => $fn, changelogs => \@changelogs };
}
sub _get_one_node {
my ($xml_info, $o_wanted_attributes) = @_;
if ($xml_info eq 'changelog') {
\&_get_changelog_node;
} elsif ($xml_info eq 'info') {
_get_simple_value_node('description', $o_wanted_attributes);
} else {
_get_simple_value_node('files', $o_wanted_attributes);
}
}
sub _get_xml_info_nodes {
my ($xml_info_file, $get_node, $fullnames) = @_;
my $fullnames_re = '^(' . join('|', map { quotemeta $_ } @$fullnames) . ')$';
my %todo = map { $_ => 1 } @$fullnames;
my %nodes;
_iterate_on_nodes($xml_info_file,
sub {
my ($reader, $fn) = @_;
if ($fn =~ /$fullnames_re/) {
$nodes{$fn} = $get_node->($reader);
delete $todo{$fn};
keys(%todo) == 0;
} else {
$reader->next;
0;
}
});
%todo and die "could not find " . join(', ', keys %todo) . " in $xml_info_file\n";
%nodes;
}
sub _do_something_with_xml_info_nodes {
my ($xml_info_file, $get_node, $do) = @_;
_iterate_on_nodes($xml_info_file,
sub {
my ($reader, $fn) = @_;
my $h = $get_node->($reader, $fn); # will read until closing tag
$do->($h);
0;
});
}
sub _iterate_on_nodes {
my ($xml_info_file, $do) = @_;
my $reader = _open_xml_reader($xml_info_file);
my $fn;
while ($fn = $reader->getAttribute('fn')) {
$do->($reader, $fn) and return; # $do must go to next node otherwise it loops!
}
$reader->readState == 3 || $reader->name eq 'media_info'
or die qq(missing attribute "fn" in tag ") . $reader->name . qq("\n);
}
1;
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