NAME
HTML::Location - Working with disk to URI file mappings
SYNOPSIS
# We have a directory on disk that is accessible via a web server
my $authors = HTML::Location->new( '/var/www/AUTHORS', 'http://ali.as/AUTHORS' );
# We know where a particular generated file needs to go
my $about = $authors->catfile( 'A', 'AD', 'ADAMK', 'about.html' );
# Save the file to disk
my $file = $about->path;
open( FILE, ">$file" ) or die "open: $!";
print FILE, $content;
close FILE;
# Show the user where to see the file
my $uri = $about->uri;
print "Author information is at $uri\n";DESCRIPTION
In several process relating to working with the web, we may need to keep track of an area of disk that maps to a particular URL. From this location, we should be able to derived both a filesystem path and URL for any given directory or file under this location that we might need to work with.
Implementation
Internally each HTML::Location object contains both a filesystem path, which is altered using File::Spec, and a URI object. When making a change, the path section of the URI is altered using <File::Spec::Unix>.
Method Calling Conventions
The main functional methods, such as catdir and catfile, do not modify the original object, instead returning a new object containing the new location.
This means that it should be used in a somewhat similar way to File::Spec.
# The File::Spec way
my $path = '/some/path';
$path = File::Spec->catfile( $path, 'some', 'file.txt' );
# The HTML::Location way
my $location = HTML::Location->new( '/some/path', 'http://foo.com/blah' );
$location = $location->catfile( 'some', 'file.txt' );OK, well it's not exactly THAT close, but you get the idea. It also allows you to do method chaining, which is basically
HTML::Location->new( '/foo', 'http://foo.com/' )->catfile( 'bar.txt' )->uriWhich may seem a little trivial now, but I expect it to get more useful later. It also means you can do things like this.
my $base = HTML::Location->new( '/my/cache', 'http://foo.com/' );
foreach my $path ( @some_files ) {
my $file = $base->catfile( $path );
print $file->path . ': ' . $file->uri . "\n";
}In the above example, you don't have to be continuously cloning the location, because all that stuff happens internally as needed.
METHODS
new $path, $http_url
The new constructor takes as argument a filesystem path and a http(s) URL. Both are required, and the method will return undef is either is illegal. The URL is not required to have protocol, host or port sections, and as such allows for host-relative URL to be used.
Returns a new HTML::Location object on success, or undef on failure.
param $various
param is provided as a mechanism for higher order modules to flexibly accept HTML::Location's as parameters. In this case, it accepts either an existing HTML::Location object, two arguments ($path, $http_url), or a reference to an array containing the same two arguments.
Returns a HTML::Location if possible, or undef if one cannot be provided.
uri
The uri method gets and returns the current URI of the location, in string form.
URI
The capitalised URI method gets and returns a copy of the raw URI, held internally by the location. Note that only a copy is returned, and as such as safe to further modify yourself without effecting the location.
path
The path method returns the filesystem path componant of the location.
catdir 'dir', 'dir', ...
A File::Spec workalike, the catdir method acts in the same way as for File::Spec, modifying both componants of the location. The catdir method returns a new HTML::Location object representing the new location, or undef on error.
catfile [ 'dir', ..., ] $file
Like catdir, the catfile method acts in the same was as for File::Spec, and returns a new HTML::Location object representing the file, or undef on error.
TO DO
This package currently contains only minimum of methods required to be useful, and is primily a convenience at this point.
Additional methods will be added over time, and additional checks to catch cases such as catching cases where we may produce a valid filesystem path, but the URL would become incorrect.
For now, it is not recommended to use HTML::Location to move upwards through the path.
SUPPORT
Bugs should be reported via the CPAN bug tracker at
http://rt.cpan.org/NoAuth/ReportBug.html?Queue=HTML%3A%3ALocation
For other issues, contact the author
AUTHORS
Adam Kennedy (Maintainer), http://ali.as/, cpan@ali.as
COPYRIGHT
Copyright (c) 2003 Adam Kennedy. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
The full text of the license can be found in the LICENSE file included with this module.