1WebService::Validator::UHsTeMrL:C:oWn3tCr(i3b)uted PerlWDeobcSuemrevnitcaet:i:oVnalidator::HTML::W3C(3)
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3
4

NAME

6       WebService::Validator::HTML::W3C - Access the W3Cs online HTML
7       validator
8

SYNOPSIS

10           use WebService::Validator::HTML::W3C;
11
12           my $v = WebService::Validator::HTML::W3C->new(
13                       detailed    =>  1
14                   );
15
16           if ( $v->validate("http://www.example.com/") ) {
17               if ( $v->is_valid ) {
18                   printf ("%s is valid\n", $v->uri);
19               } else {
20                   printf ("%s is not valid\n", $v->uri);
21                   foreach my $error ( @{$v->errors} ) {
22                       printf("%s at line %d\n", $error->msg,
23                                                 $error->line);
24                   }
25               }
26           } else {
27               printf ("Failed to validate the website: %s\n", $v->validator_error);
28           }
29

DESCRIPTION

31       WebService::Validator::HTML::W3C provides access to the W3C's online
32       Markup validator. As well as reporting on whether a page is valid it
33       also provides access to a detailed list of the errors and where in the
34       validated document they occur.
35

METHODS

37   new
38           my $v = WebService::Validator::HTML::W3C->new();
39
40       Returns a new instance of the WebService::Validator::HTML::W3C object.
41
42       There are various options that can be set when creating the Validator
43       object like so:
44
45           my $v = WebService::Validator::HTML::W3C->new( http_timeout => 20 );
46
47       validator_uri
48           The URI of the validator to use.  By default this accesses the W3Cs
49           validator at http://validator.w3.org/check. If you have a local
50           installation of the validator ( recommended if you wish to do a lot
51           of testing ) or wish to use a validator at another location then
52           you can use this option. Please note that you need to use the full
53           path to the validator cgi.
54
55       ua  The user agent to use. Should be an LWP::UserAgent object or
56           something that provides the same interface. If this argument is
57           provided, the "http_timeout" and "proxy" arguments are ignored.
58
59       http_timeout
60           How long (in seconds) to wait for the HTTP connection to timeout
61           when contacting the validator. By default this is 30 seconds.
62
63       detailed
64           This fetches the XML response from the validator in order to
65           provide information for the errors method. You should set this to
66           true if you intend to use the errors method.
67
68       proxy
69           An HTTP proxy to use when communicating with the validation
70           service.
71
72       output
73           Controls which output format is used. Can be either xml or soap12.
74
75           The default is soap12 as the XML format is deprecated and is likely
76           to be removed in the future.
77
78           The default will always work so unless you're using a locally
79           installed Validator you can safely ignore this.
80
81   validate
82           $v->validate( 'http:://www.example.com/' );
83
84       Validate a URI. Returns 0 if the validation fails (e.g if the validator
85       cannot be reached), otherwise 1.
86
87   validate_file
88           $v->validate_file( './file.html' );
89
90       Validate a file by uploading it to the W3C Validator. NB This has only
91       been tested on a Linux box so may not work on non unix machines.
92
93   validate_markup
94           $v->validate_markup( $markup );
95
96       Validate a scalar containing HTML.
97
98   Alternate interface
99       You can also pass a hash in to specify what you wish to validate. This
100       is provided to ensure compatibility with the CSS validator module.
101
102               $v->validate( uri => 'http://example.com/' );
103               $v->validate( string => $markup );
104               $v->validate( file => './file.html' );
105
106   is_valid
107           $v->is_valid;
108
109       Returns true (1) if the URI validated otherwise 0.
110
111   uri
112           $v->uri();
113
114       Returns the URI of the last page on which validation succeeded.
115
116   num_errors
117           $num_errors = $v->num_errors();
118
119       Returns the number of errors that the validator encountered.
120
121   errorcount
122       Synonym for num_errors. There to match CSS Validator interface.
123
124   warningcount
125           $num_errors = $v->warningcount();
126
127       Returns the number of warnings that the validator encountered.
128
129   errors
130           $errors = $v->errors();
131
132           foreach my $err ( @$errors ) {
133               printf("line: %s, col: %s\n\terror: %s\n",
134                       $err->line, $err->col, $err->msg);
135           }
136
137       Returns an array ref of WebService::Validator::HTML::W3C::Error
138       objects.  These have line, col and msg methods that return a line
139       number, a column in that line and the error that occurred at that
140       point.
141
142       Note that you need XML::XPath for this to work and you must have
143       initialised WebService::Validator::HTML::W3C with the detailed option.
144       If you have not set the detailed option a warning will be issued, the
145       detailed option will be set and a second request made to the validator
146       in order to fetch the required information.
147
148       If there was a problem processing the detailed information then this
149       method will return 0.
150
151   warnings
152           $warnings = $v->warnings();
153
154       Works exactly the same as errors only returns an array ref of
155       WebService::Validator::HTML::W3C::Warning objects. In all other
156       respects it's the same.
157
158   validator_error
159           $error = $v->validator_error();
160
161       Returns a string indicating why validation may not have occurred. This
162       is not the reason that a webpage was invalid. It is the reason that no
163       meaningful information about the attempted validation could be
164       obtained. This is most likely to be an HTTP error
165
166       Possible values are:
167
168       You need to supply a URI to validate
169           You didn't pass a URI to the validate method
170
171       You need to supply a URI with a scheme
172           The URI you passed to validate didn't have a scheme on the front.
173           The W3C validator can't handle URIs like www.example.com but
174           instead needs URIs of the form http://www.example.com/.
175
176       Not a W3C Validator or Bad URI
177           The URI did not return the headers that
178           WebService::Validator::HTML::W3C relies on so it is likely that
179           there is not a W3C Validator at that URI.  The other possibility is
180           that it didn't like the URI you provided. Sadly the Validator
181           doesn't give very useful feedback on this at the moment.
182
183       Could not contact validator
184           WebService::Validator::HTML::W3C could not establish a connection
185           to the URI.
186
187       Did not get a sensible result from the validator
188           Should never happen and most likely indicates a problem somewhere
189           but on the off chance that WebService::Validator::HTML::W3C is
190           unable to make sense of the response from the validator you'll get
191           this error.
192
193       Result format does not appear to be SOAP|XML
194           If you've asked for detailed results and the reponse from the
195           validator isn't in the expected format then you'll get this error.
196           Most likely to happen if you ask for SOAP output from a validator
197           that doesn't support that format.
198
199       You need to provide a uri, string or file to validate
200           You've passed in a hash ( or in fact more than one argument ) to
201           validate but the hash does not contain one of the three expected
202           keys.
203
204   validator_uri
205           $uri = $v->validator_uri();
206           $v->validator_uri('http://validator.w3.org/check');
207
208       Returns or sets the URI of the validator to use. Please note that you
209       need to use the full path to the validator cgi.
210
211   http_timeout
212           $timeout = $v->http_timeout();
213           $v->http_timeout(10);
214
215       Returns or sets the timeout for the HTTP request.
216

OTHER MODULES

218       Please note that there is also an official W3C module that is part of
219       the W3C::LogValidator distribution. However that module is not very
220       useful outside the constraints of that package.
221       WebService::Validator::HTML::W3C is meant as a more general way to
222       access the W3C Validator.
223
224       HTML::Validator uses nsgmls to validate against the W3Cs DTDs. You have
225       to fetch the relevant DTDs and so on.
226
227       There is also the HTML::Parser based HTML::Lint which mostly checks for
228       known tags rather than XML/HTML validity.
229
230       WebService::Validator::CSS::W3C provides the same functionality as this
231       module for the W3C's CSS validator.
232

IMPORTANT

234       This module is not in any way associated with the W3C so please do not
235       report any problems with this module to them. Also please remember that
236       the online Validator is a shared resource so do not abuse it. This
237       means sleeping between requests. If you want to do a lot of testing
238       against it then please consider downloading and installing the
239       Validator software which is available from the W3C. Debian testing
240       users will also find that it is available via apt-get.
241

BUGS

243       While the interface to the Validator is fairly stable it may be
244       updated. I will endeavour to track any changes with this module so
245       please check on CPAN for new versions if you find things break. Also
246       note that this module is only guaranteed to work with the currently
247       stable version of the validator. It will most likely work with any Beta
248       versions but don't rely on it.
249
250       If in doubt please try and run the test suite before reporting bugs.
251       Note that in order to run tests against the validator service you will
252       need to have a connection to the internet and also set an environment
253       variable called TEST_AUTHOR.
254
255       That said I'm very happy to hear about bugs. All the more so if they
256       come with patches ;).
257
258       Please use <http://rt.cpan.org/> for filing bug reports, and indeed
259       feature requests. The code can also be found on github
260       <https://github.com/struan/webservice-validator-html-w3c>.
261

THANKS

263       To the various people on the code review ladder mailing list who
264       provided useful suggestions.
265
266       Carl Vincent provided a patch to allow for proxy support.
267
268       Chris Dolan provided a patch to allow for custom user agents.
269
270       Matt Ryder provided a patch for support of the explanations in the SOAP
271       output.
272

SUPPORT

274       author email or via <http://rt.cpan.org/>.
275

AUTHOR

277       Struan Donald <struan@cpan.org>
278
279       <http://www.exo.org.uk/code/>
280
282       Copyright (C) 2003-2008 Struan Donald. All rights reserved.
283

LICENSE

285       This program is free software; you can redistribute it and/or modify it
286       under the same terms as Perl itself.
287

SEE ALSO

289       perl(1).
290
291
292
293perl v5.30.1                      2020-01-30WebService::Validator::HTML::W3C(3)
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