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# $Id: Accessibility.pm,v 1.3 2005/03/08 23:23:37 comdog Exp $ |
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package Test::WWW::Accessibility; |
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use strict; |
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use base qw( Exporter ); |
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use vars qw( $VERSION @EXPORT_OK @EXPORT ); |
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$VERSION = '0.11_01'; |
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@EXPORT = qw( img_tags_have_alt_ok ); |
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use Test::Builder; |
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my $Test = Test::Builder->new(); |
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=head1 NAME |
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Test::WWW::Accessibility; |
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=head1 SYNOPSIS |
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use Test::More tests => 1; |
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use Test::WWW::Accessibility; |
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my $html = ...; |
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img_tags_have_alt_ok( $html ); |
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# more functions to come |
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=head1 DESCRIPTION |
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This module provides functions to check a web page for accessibility |
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=head2 Functions |
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All of these functions are exported by default. |
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=over 4 |
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=item accessibility_ok( HTML ) |
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This function will run several other of the tests and return a |
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single answer. |
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NOT YET IMPLEMENTED |
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=cut |
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sub accessibility_ok |
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{ |
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} |
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=item img_tags_have_alt_ok( HTML [, NAME] ) |
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OK if all of the IMG tags in HTML have non-empty ALT values (so the |
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empty string does not count!). |
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You can specify a name for the test as the optional, second argument. |
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If you don't, the function supplies on for you. |
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=cut |
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sub img_tags_have_alt_ok |
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{ |
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my $name = $_[1] || 'IMG tags have ALT attributes'; |
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# parse HTML to get all IMG tags |
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my @imgs = &_get_img_tags; |
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#$Test->diag( "Got " . @imgs . " image tags" ); |
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# count ALT tags |
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my $alts = grep { exists $_->{alt} && $_->{alt} } @imgs; |
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#$Test->diag( "Got " . $alts . " ALT tags" ); |
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$Test->ok( @imgs == $alts, $name ); |
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} |
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sub _get_img_tags |
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{ |
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my $html = shift; |
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my @imgs = (); |
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my $p = Test::WWW::Accessibility::ImgExtor->new( sub { |
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my $tag = shift; |
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return if $tag ne 'img'; |
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push @imgs, { @_ }; |
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} ); |
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$p->parse( $html ); |
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return @imgs; |
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} |
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=item no_server_side_imagemaps_ok( HTML ) |
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NOT YET IMPLEMENTED |
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=cut |
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sub no_server_side_imagemaps_ok |
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} |
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=item multimedia_has_caption_ok( HTML ) |
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NOT YET IMPLEMENTED |
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=cut |
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sub multimedia_has_caption_ok |
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} |
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=item no_click_here_ok( HTML ) |
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Link text is not "click here". |
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NOT YET IMPLEMENTED |
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=cut |
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sub no_click_here_ok |
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} |
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=item unique_link_text_ok( HTML ) |
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Link text for each URL is unique. |
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NOT YET IMPLEMENTED |
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=cut |
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sub unique_link_text_ok() |
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} |
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=item validates_ok( HTML ) |
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NOT YET IMPLEMENTED |
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=cut |
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sub validates_ok |
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} |
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=back |
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152
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=head1 SOURCE AVAILABILITY |
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154
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This source is part of a SourceForge project which always has the |
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latest sources in CVS, as well as all of the previous releases. |
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http://sourceforge.net/projects/brian-d-foy/ |
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If, for some reason, I disappear from the world, one of the other |
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members of the project can shepherd this module appropriately. |
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=head1 AUTHOR |
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164
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brian d foy, C<< >> |
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=head1 COPYRIGHT |
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168
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Copyright 2004 brian d foy, All rights reserved. |
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You can use this module under the same terms as |
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Perl itself. |
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=cut |
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175
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package Test::WWW::Accessibility::ImgExtor; |
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177
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use strict; |
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178
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179
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2690
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use HTML::Tagset (); |
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5114
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180
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18
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use base qw( HTML::Parser ); |
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2786
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182
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require HTML::Parser; |
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184
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sub new |
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{ |
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my($class, $cb, $base) = @_; |
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my $self = $class->SUPER::new( |
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start_h => ["_start_tag", "self,tagname,attr"], |
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report_tags => [keys %HTML::Tagset::linkElements], |
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); |
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$self->{extractlink_cb} = $cb; |
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if ($base) { |
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require URI; |
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$self->{extractlink_base} = URI->new($base); |
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} |
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$self; |
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} |
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sub _start_tag |
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{ |
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568
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568
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my($self, $tag, $attr) = @_; |
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203
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568
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764
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my $base = $self->{extractlink_base}; |
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1374
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my $links = [ qw( src alt ) ]; |
205
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568
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1197
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$links = [$links] unless ref $links; |
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207
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547
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my @links; |
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my $a; |
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568
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725
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for $a (@$links) { |
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1136
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next unless exists $attr->{$a}; |
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1036
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push(@links, $a, $base ? URI->new($attr->{$a}, $base)->abs($base) |
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: $attr->{$a}); |
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} |
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568
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4155
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return unless @links; |
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463
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$self->_found_link($tag, @links); |
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} |
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218
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sub _found_link |
219
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{ |
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my $self = shift; |
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228
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287
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my $cb = $self->{extractlink_cb}; |
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539
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if ($cb) { |
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472
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&$cb(@_); |
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} else { |
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push(@{$self->{'links'}}, [@_]); |
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} |
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} |
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229
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# We override the parse_file() method so that we can clear the links |
230
|
|
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|
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|
# before we start a new file. |
231
|
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|
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sub parse_file |
232
|
|
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{ |
233
|
0
|
|
|
0
|
|
|
my $self = shift; |
234
|
0
|
|
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|
|
delete $self->{'links'}; |
235
|
0
|
|
|
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|
|
$self->SUPER::parse_file(@_); |
236
|
|
|
|
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|
|
} |
237
|
|
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|
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|
238
|
|
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239
|
|
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|
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|
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1; |