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.\"
.IX Title "MediaWiki::DumpFile::Compat::Revisions 3pm"
.TH MediaWiki::DumpFile::Compat::Revisions 3pm "2022-06-15" "perl v5.34.0" "User Contributed Perl Documentation"
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.if n .ad l
.nh
.SH "NAME"
Parse::MediaWikiDump::Revisions \- Object capable of processing dump files with multiple revisions per article
.SH "ABOUT"
.IX Header "ABOUT"
This object is used to access the metadata associated with a MediaWiki instance and provide an iterative interface
for extracting the individual article revisions out of the same. To guarantee that there is only a single
revision per article use the Parse::MediaWikiDump::Pages object.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  use MediaWiki::DumpFile::Compat;
\&  
\&  $pmwd = Parse::MediaWikiDump\->new;
\&  $revisions = $pmwd\->revisions(\*(Aqpages\-articles.xml\*(Aq);
\&  $revisions = $pmwd\->revisions(\e*FILEHANDLE);
\&  
\&  #print the title and id of each article inside the dump file
\&  while(defined($page = $revisions\->next)) {
\&    print "title \*(Aq", $page\->title, "\*(Aq id ", $page\->id, "\en";
\&  }
.Ve
.SH "METHODS"
.IX Header "METHODS"
.ie n .IP "$revisions\->new" 4
.el .IP "\f(CW$revisions\fR\->new" 4
.IX Item "$revisions->new"
Open the specified MediaWiki dump file. If the single argument to this method
is a string it will be used as the path to the file to open. If the argument
is a reference to a filehandle the contents will be read from the filehandle as
specified.
.ie n .IP "$revisions\->next" 4
.el .IP "\f(CW$revisions\fR\->next" 4
.IX Item "$revisions->next"
Returns an instance of the next available Parse::MediaWikiDump::page object or returns undef
if there are no more articles left.
.ie n .IP "$revisions\->version" 4
.el .IP "\f(CW$revisions\fR\->version" 4
.IX Item "$revisions->version"
Returns a plain text string of the dump file format revision number
.ie n .IP "$revisions\->sitename" 4
.el .IP "\f(CW$revisions\fR\->sitename" 4
.IX Item "$revisions->sitename"
Returns a plain text string that is the name of the MediaWiki instance.
.ie n .IP "$revisions\->base" 4
.el .IP "\f(CW$revisions\fR\->base" 4
.IX Item "$revisions->base"
Returns the \s-1URL\s0 to the instances main article in the form of a string.
.ie n .IP "$revisions\->generator" 4
.el .IP "\f(CW$revisions\fR\->generator" 4
.IX Item "$revisions->generator"
Returns a string containing 'MediaWiki' and a version number of the instance that dumped this file.
Example: 'MediaWiki 1.14alpha'
.ie n .IP "$revisions\->case" 4
.el .IP "\f(CW$revisions\fR\->case" 4
.IX Item "$revisions->case"
Returns a string describing the case sensitivity configured in the instance.
.ie n .IP "$revisions\->namespaces" 4
.el .IP "\f(CW$revisions\fR\->namespaces" 4
.IX Item "$revisions->namespaces"
Returns a reference to an array of references. Each reference is to another array with the first
item being the unique identifier of the namespace and the second element containing a string
that is the name of the namespace.
.ie n .IP "$revisions\->namespaces_names" 4
.el .IP "\f(CW$revisions\fR\->namespaces_names" 4
.IX Item "$revisions->namespaces_names"
Returns an array reference the array contains strings of all the namespaces each as an element.
.ie n .IP "$revisions\->current_byte" 4
.el .IP "\f(CW$revisions\fR\->current_byte" 4
.IX Item "$revisions->current_byte"
Returns the number of bytes that has been processed so far
.ie n .IP "$revisions\->size" 4
.el .IP "\f(CW$revisions\fR\->size" 4
.IX Item "$revisions->size"
Returns the total size of the dump file in bytes.
.SH "EXAMPLE"
.IX Header "EXAMPLE"
.SS "Extract the article text of each revision of an article using a given title"
.IX Subsection "Extract the article text of each revision of an article using a given title"
.Vb 1
\&  #!/usr/bin/perl
\&  
\&  use strict;
\&  use warnings;
\&  use MediaWiki::DumpFile::Compat;
\&  
\&  my $file = shift(@ARGV) or die "must specify a MediaWiki dump of the current pages";
\&  my $title = shift(@ARGV) or die "must specify an article title";
\&  my $pmwd = Parse::MediaWikiDump\->new;
\&  my $dump = $pmwd\->revisions($file);
\&  my $found = 0;
\&  
\&  binmode(STDOUT, \*(Aq:utf8\*(Aq);
\&  binmode(STDERR, \*(Aq:utf8\*(Aq);
\&  
\&  #this is the only currently known value but there could be more in the future
\&  if ($dump\->case ne \*(Aqfirst\-letter\*(Aq) {
\&    die "unable to handle any case setting besides \*(Aqfirst\-letter\*(Aq";
\&  }
\&  
\&  $title = case_fixer($title);
\&  
\&  while(my $revision = $dump\->next) {
\&    if ($revision\->title eq $title) {
\&      print STDERR "Located text for $title revision ", $revision\->revision_id, "\en";
\&      my $text = $revision\->text;
\&      print $$text;
\&      
\&      $found = 1;
\&    }
\&  }
\&  
\&  print STDERR "Unable to find article text for $title\en" unless $found;
\&  exit 1;
\&  
\&  #removes any case sensativity from the very first letter of the title
\&  #but not from the optional namespace name
\&  sub case_fixer {
\&    my $title = shift;
\&  
\&    #check for namespace
\&    if ($title =~ /^(.+?):(.+)/) {
\&      $title = $1 . \*(Aq:\*(Aq . ucfirst($2);
\&    } else {
\&      $title = ucfirst($title);
\&    }
\&  
\&    return $title;
\&  }
.Ve
.SH "LIMITATIONS"
.IX Header "LIMITATIONS"
.SS "Version 0.4"
.IX Subsection "Version 0.4"
This class was updated to support version 0.4 dump files from
a MediaWiki instance but it does not currently support any of
the new information available in those files.