Xpath query for class matching

[nitin gupta-3]

Hi all,

For the module I am maintaining at drupal, I need to select the element which has a specific class. I am using the following query for it:

for eg <div class="foo"></div> is selected by the following query.

$class = "foo";

$xpath->query("//*[@class = '".$class."']");

But, this fails in case of multiple classes, i.e. does not select this :

<div class="foo bar"> </div>

I don't have much experience in writing regex, can someone please help me out with this.

One more question: is this url valid : http://xyz.com/path with space.html

Looking forward.

--
Regards,
Nitin Kumar Gupta
http://publicmind.in/blog/

[Domenic Santangelo]

nitin gupta wrote:

for eg <div class="foo"></div> is selected by the following query.

$class = "foo";

$xpath->query("//*[@class = '".$class."']");

But, this fails in case of multiple classes, i.e. does not select this :

<div class="foo bar"> </div>

The "contains" function would probably work, eg (untested):
$xpath->query("//div[contains(@class, '" . $class . "')]");

One more question: is this url valid : http://xyz.com/path with space.html

Nope. You can escape the url if you just HAVE to have spaces:

http://n00b.com/path%20with%20space.html

but why not use dashes?

http://pro.com/path-with-properly-indexed-spaces.html

-Dom

[nitin gupta-3]

Thanks for your help. but this query will probably select "abcfooxyz" as well when "foo" is supplied. (untested), although it will definitely select "foo" in "foo bar" (tested)

$xpath->query("//div[contains(@class, '" . $class . "')]") 

How can we be more specific? 

@URL: Actually I am maintaining the module feedapi imagegrabber, which downloads images from external websites. Now sometimes the url I parse has spaces, so I am unable to decide whether or not  to percentage encode the URL, because percentage encoding will make this URL valid but will break the following URL:
http://www.google.com/search?q=hello

by converting it to 

http://www.google.com/search?q%3Dhello

Looking forward.

--
Regards,
Nitin Kumar Gupta
http://publicmind.in/blog/


On Sat, Oct 3, 2009 at 1:30 AM, Domenic Santangelo <domenic@...> wrote:
>
> nitin gupta wrote:
>
> for eg <div class="foo"></div> is selected by the following query.
> $class = "foo";
> $xpath->query("//*[@class = '".$class."']");
> But, this fails in case of multiple classes, i.e. does not select this :
> <div class="foo bar"> </div>
>
> The "contains" function would probably work, eg (untested):
> $xpath->query("//div[contains(@class, '" . $class . "')]");
>
> One more question: is this url valid : http://xyz.com/path with space.html
>
> Nope. You can escape the url if you just HAVE to have spaces:
>
> http://n00b.com/path%20with%20space.html
>
> but why not use dashes?
>
> http://pro.com/path-with-properly-indexed-spaces.html
>
> -Dom

[Domenic Santangelo]

nitin gupta wrote:

Thanks for your help. but this query will probably select "abcfooxyz" as well when "foo" is supplied. (untested), although it will definitely select "foo" in "foo bar" (tested)

$xpath->query("//div[contains(@class, '" . $class . "')]") 

How can we be more specific?

Try this example: http://westhoffswelt.de/blog/0036_xpath_to_select_html_by_class.html

@URL: Actually I am maintaining the module feedapi imagegrabber, which downloads images from external websites. Now sometimes the url I parse has spaces, so I am unable to decide whether or not  to percentage encode the URL, because percentage encoding will make this URL valid but will break the following URL:
http://www.google.com/search?q=hello

by converting it to 

http://www.google.com/search?q%3Dhello

"q=hello" is a query string, not strictly part of the path. I would strip the url to its component parts (parse_url) and encode the path, then re-append the query string.

http://us2.php.net/manual/en/function.parse-url.php
http://www.faqs.org/rfcs/rfc1738.html

HTH,

-D

Looking forward.

--
Regards,
Nitin Kumar Gupta
http://publicmind.in/blog/


On Sat, Oct 3, 2009 at 1:30 AM, Domenic Santangelo <domenic@...> wrote:
>
> nitin gupta wrote:
>
> for eg <div class="foo"></div> is selected by the following query.
> $class = "foo";
> $xpath->query("//*[@class = '".$class."']");
> But, this fails in case of multiple classes, i.e. does not select this :
> <div class="foo bar"> </div>
>
> The "contains" function would probably work, eg (untested):
> $xpath->query("//div[contains(@class, '" . $class . "')]");
>
> One more question: is this url valid : http://xyz.com/path with space.html
>
> Nope. You can escape the url if you just HAVE to have spaces:
>
> http://n00b.com/path%20with%20space.html
>
> but why not use dashes?
>
> http://pro.com/path-with-properly-indexed-spaces.html
>
> -Dom

[nitin gupta-3]

Hi,

Thanks, It works like a charm.. When will we get a perfect search engine?

@URL: Maybe in hurry, I did not explain it properly. This was exactly what I was doing. look at the project, https://sourceforge.net/projects/absoluteurl/

until I came across this image url on the google images page:

http://t3.gstatic.com/images?q=tbn:7i1D2KAZcCd8yM:http://www.flash-slideshow-maker.com/images/help_clip_image004.jpg

What would you consider here the query string or the path? Anything we do, the URL is going to break unless we do nothing. Any ideas?(may be just for encode the spaces).

--
Regards,
Nitin Kumar Gupta
http://publicmind.in/blog/

On Sat, Oct 3, 2009 at 2:22 AM, Domenic Santangelo <domenic@...> wrote:

nitin gupta wrote:

Thanks for your help. but this query will probably select "abcfooxyz" as well when "foo" is supplied. (untested), although it will definitely select "foo" in "foo bar" (tested)

$xpath->query("//div[contains(@class, '" . $class . "')]") 

How can we be more specific?

Try this example: http://westhoffswelt.de/blog/0036_xpath_to_select_html_by_class.html

@URL: Actually I am maintaining the module feedapi imagegrabber, which downloads images from external websites. Now sometimes the url I parse has spaces, so I am unable to decide whether or not  to percentage encode the URL, because percentage encoding will make this URL valid but will break the following URL:
http://www.google.com/search?q=hello

by converting it to 

http://www.google.com/search?q%3Dhello

"q=hello" is a query string, not strictly part of the path. I would strip the url to its component parts (parse_url) and encode the path, then re-append the query string.

http://us2.php.net/manual/en/function.parse-url.php
http://www.faqs.org/rfcs/rfc1738.html

HTH,

-D

Looking forward.

--
Regards,
Nitin Kumar Gupta
http://publicmind.in/blog/


On Sat, Oct 3, 2009 at 1:30 AM, Domenic Santangelo <domenic@...> wrote:
>
> nitin gupta wrote:
>
> for eg <div class="foo"></div> is selected by the following query.
> $class = "foo";
> $xpath->query("//*[@class = '".$class."']");
> But, this fails in case of multiple classes, i.e. does not select this :
> <div class="foo bar"> </div>
>
> The "contains" function would probably work, eg (untested):
> $xpath->query("//div[contains(@class, '" . $class . "')]");
>
> One more question: is this url valid : http://xyz.com/path with space.html
>
> Nope. You can escape the url if you just HAVE to have spaces:
>
> http://n00b.com/path%20with%20space.html
>
> but why not use dashes?
>
> http://pro.com/path-with-properly-indexed-spaces.html
>
> -Dom

[Domenic Santangelo]

nitin gupta wrote:

@URL: Maybe in hurry, I did not explain it properly. This was exactly what I was doing. look at the project, https://sourceforge.net/projects/absoluteurl/

until I came across this image url on the google images page:

http://t3.gstatic.com/images?q=tbn:7i1D2KAZcCd8yM:http://www.flash-slideshow-maker.com/images/help_clip_image004.jpg

What would you consider here the query string or the path? Anything we do, the URL is going to break unless we do nothing. Any ideas?(may be just for encode the spaces).

scheme: http
host: t3.gstatic.com
path: images
query: q=tbn:7i1D2KAZcCd8yM:http://www.flash-slideshow-maker.com/images/help_clip_image004.jpg

That url is some sort of thumbnail maker or something... compare to http://www.flash-slideshow-maker.com/images/help_clip_image004.jpg

-D

--
Regards,
Nitin Kumar Gupta
http://publicmind.in/blog/

On Sat, Oct 3, 2009 at 2:22 AM, Domenic Santangelo <domenic@...> wrote:

nitin gupta wrote:

Thanks for your help. but this query will probably select "abcfooxyz" as well when "foo" is supplied. (untested), although it will definitely select "foo" in "foo bar" (tested)

$xpath->query("//div[contains(@class, '" . $class . "')]") 

How can we be more specific?

Try this example: http://westhoffswelt.de/blog/0036_xpath_to_select_html_by_class.html

@URL: Actually I am maintaining the module feedapi imagegrabber, which downloads images from external websites. Now sometimes the url I parse has spaces, so I am unable to decide whether or not  to percentage encode the URL, because percentage encoding will make this URL valid but will break the following URL:
http://www.google.com/search?q=hello

by converting it to 

http://www.google.com/search?q%3Dhello

"q=hello" is a query string, not strictly part of the path. I would strip the url to its component parts (parse_url) and encode the path, then re-append the query string.

http://us2.php.net/manual/en/function.parse-url.php
http://www.faqs.org/rfcs/rfc1738.html

HTH,

-D

Looking forward.

--
Regards,
Nitin Kumar Gupta
http://publicmind.in/blog/


On Sat, Oct 3, 2009 at 1:30 AM, Domenic Santangelo <domenic@...> wrote:
>
> nitin gupta wrote:
>
> for eg <div class="foo"></div> is selected by the following query.
> $class = "foo";
> $xpath->query("//*[@class = '".$class."']");
> But, this fails in case of multiple classes, i.e. does not select this :
> <div class="foo bar"> </div>
>
> The "contains" function would probably work, eg (untested):
> $xpath->query("//div[contains(@class, '" . $class . "')]");
>
> One more question: is this url valid : http://xyz.com/path with space.html
>
> Nope. You can escape the url if you just HAVE to have spaces:
>
> http://n00b.com/path%20with%20space.html
>
> but why not use dashes?
>
> http://pro.com/path-with-properly-indexed-spaces.html
>
> -Dom

[nitin gupta-3]

Yeah, I understand . it is the thumbnail maker for google images page. But if I want to have a specific script for this conversion, one can never be sure. If you notice, there are two colons in the query, which if percent encoded will render the URL invalid.

Thanks for all your inputs. 

--
Regards,
Nitin Kumar Gupta
http://publicmind.in/blog/

On Sat, Oct 3, 2009 at 3:06 AM, Domenic Santangelo <domenic@...> wrote:

nitin gupta wrote:

@URL: Maybe in hurry, I did not explain it properly. This was exactly what I was doing. look at the project, https://sourceforge.net/projects/absoluteurl/

until I came across this image url on the google images page:

http://t3.gstatic.com/images?q=tbn:7i1D2KAZcCd8yM:http://www.flash-slideshow-maker.com/images/help_clip_image004.jpg

What would you consider here the query string or the path? Anything we do, the URL is going to break unless we do nothing. Any ideas?(may be just for encode the spaces).

scheme: http
host: t3.gstatic.com
path: images
query: q=tbn:7i1D2KAZcCd8yM:http://www.flash-slideshow-maker.com/images/help_clip_image004.jpg

That url is some sort of thumbnail maker or something... compare to http://www.flash-slideshow-maker.com/images/help_clip_image004.jpg

-D

--
Regards,
Nitin Kumar Gupta
http://publicmind.in/blog/

On Sat, Oct 3, 2009 at 2:22 AM, Domenic Santangelo <domenic@...> wrote:

nitin gupta wrote:

Thanks for your help. but this query will probably select "abcfooxyz" as well when "foo" is supplied. (untested), although it will definitely select "foo" in "foo bar" (tested)

$xpath->query("//div[contains(@class, '" . $class . "')]") 

How can we be more specific?

Try this example: http://westhoffswelt.de/blog/0036_xpath_to_select_html_by_class.html

@URL: Actually I am maintaining the module feedapi imagegrabber, which downloads images from external websites. Now sometimes the url I parse has spaces, so I am unable to decide whether or not  to percentage encode the URL, because percentage encoding will make this URL valid but will break the following URL:
http://www.google.com/search?q=hello

by converting it to 

http://www.google.com/search?q%3Dhello

"q=hello" is a query string, not strictly part of the path. I would strip the url to its component parts (parse_url) and encode the path, then re-append the query string.

http://us2.php.net/manual/en/function.parse-url.php
http://www.faqs.org/rfcs/rfc1738.html

HTH,

-D

Looking forward.

--
Regards,
Nitin Kumar Gupta
http://publicmind.in/blog/


On Sat, Oct 3, 2009 at 1:30 AM, Domenic Santangelo <domenic@...> wrote:
>
> nitin gupta wrote:
>
> for eg <div class="foo"></div> is selected by the following query.
> $class = "foo";
> $xpath->query("//*[@class = '".$class."']");
> But, this fails in case of multiple classes, i.e. does not select this :
> <div class="foo bar"> </div>
>
> The "contains" function would probably work, eg (untested):
> $xpath->query("//div[contains(@class, '" . $class . "')]");
>
> One more question: is this url valid : http://xyz.com/path with space.html
>
> Nope. You can escape the url if you just HAVE to have spaces:
>
> http://n00b.com/path%20with%20space.html
>
> but why not use dashes?
>
> http://pro.com/path-with-properly-indexed-spaces.html
>
> -Dom

[Domenic Santangelo]

You don't encode the query string, just the path.

-D

nitin gupta wrote:

Yeah, I understand . it is the thumbnail maker for google images page. But if I want to have a specific script for this conversion, one can never be sure. If you notice, there are two colons in the query, which if percent encoded will render the URL invalid.

Thanks for all your inputs. 

--
Regards,
Nitin Kumar Gupta
http://publicmind.in/blog/

On Sat, Oct 3, 2009 at 3:06 AM, Domenic Santangelo <domenic@...> wrote:

nitin gupta wrote:

@URL: Maybe in hurry, I did not explain it properly. This was exactly what I was doing. look at the project, https://sourceforge.net/projects/absoluteurl/

until I came across this image url on the google images page:

http://t3.gstatic.com/images?q=tbn:7i1D2KAZcCd8yM:http://www.flash-slideshow-maker.com/images/help_clip_image004.jpg

What would you consider here the query string or the path? Anything we do, the URL is going to break unless we do nothing. Any ideas?(may be just for encode the spaces).

scheme: http
host: t3.gstatic.com
path: images
query: q=tbn:7i1D2KAZcCd8yM:http://www.flash-slideshow-maker.com/images/help_clip_image004.jpg

That url is some sort of thumbnail maker or something... compare to http://www.flash-slideshow-maker.com/images/help_clip_image004.jpg

-D

--
Regards,
Nitin Kumar Gupta
http://publicmind.in/blog/

On Sat, Oct 3, 2009 at 2:22 AM, Domenic Santangelo <domenic@...> wrote:

nitin gupta wrote:

Thanks for your help. but this query will probably select "abcfooxyz" as well when "foo" is supplied. (untested), although it will definitely select "foo" in "foo bar" (tested)

$xpath->query("//div[contains(@class, '" . $class . "')]") 

How can we be more specific?

Try this example: http://westhoffswelt.de/blog/0036_xpath_to_select_html_by_class.html

@URL: Actually I am maintaining the module feedapi imagegrabber, which downloads images from external websites. Now sometimes the url I parse has spaces, so I am unable to decide whether or not  to percentage encode the URL, because percentage encoding will make this URL valid but will break the following URL:
http://www.google.com/search?q=hello

by converting it to 

http://www.google.com/search?q%3Dhello

"q=hello" is a query string, not strictly part of the path. I would strip the url to its component parts (parse_url) and encode the path, then re-append the query string.

http://us2.php.net/manual/en/function.parse-url.php
http://www.faqs.org/rfcs/rfc1738.html

HTH,

-D

Looking forward.

--
Regards,
Nitin Kumar Gupta
http://publicmind.in/blog/


On Sat, Oct 3, 2009 at 1:30 AM, Domenic Santangelo <domenic@...> wrote:
>
> nitin gupta wrote:
>
> for eg <div class="foo"></div> is selected by the following query.
> $class = "foo";
> $xpath->query("//*[@class = '".$class."']");
> But, this fails in case of multiple classes, i.e. does not select this :
> <div class="foo bar"> </div>
>
> The "contains" function would probably work, eg (untested):
> $xpath->query("//div[contains(@class, '" . $class . "')]");
>
> One more question: is this url valid : http://xyz.com/path with space.html
>
> Nope. You can escape the url if you just HAVE to have spaces:
>
> http://n00b.com/path%20with%20space.html
>
> but why not use dashes?
>
> http://pro.com/path-with-properly-indexed-spaces.html
>
> -Dom

[nitin gupta-3]

That will do till we run into some other exceptions :-). Thanks, I did not think of encoding just the path.

--
Regards,
Nitin Kumar Gupta
http://publicmind.in/blog/

On Sat, Oct 3, 2009 at 3:33 AM, Domenic Santangelo <domenic@...> wrote:

You don't encode the query string, just the path.

-D

nitin gupta wrote:

Yeah, I understand . it is the thumbnail maker for google images page. But if I want to have a specific script for this conversion, one can never be sure. If you notice, there are two colons in the query, which if percent encoded will render the URL invalid.

Thanks for all your inputs. 

--
Regards,
Nitin Kumar Gupta
http://publicmind.in/blog/

On Sat, Oct 3, 2009 at 3:06 AM, Domenic Santangelo <domenic@...> wrote:

nitin gupta wrote:

@URL: Maybe in hurry, I did not explain it properly. This was exactly what I was doing. look at the project, https://sourceforge.net/projects/absoluteurl/

until I came across this image url on the google images page:

http://t3.gstatic.com/images?q=tbn:7i1D2KAZcCd8yM:http://www.flash-slideshow-maker.com/images/help_clip_image004.jpg

What would you consider here the query string or the path? Anything we do, the URL is going to break unless we do nothing. Any ideas?(may be just for encode the spaces).

scheme: http
host: t3.gstatic.com
path: images
query: q=tbn:7i1D2KAZcCd8yM:http://www.flash-slideshow-maker.com/images/help_clip_image004.jpg

That url is some sort of thumbnail maker or something... compare to http://www.flash-slideshow-maker.com/images/help_clip_image004.jpg

-D

--
Regards,
Nitin Kumar Gupta
http://publicmind.in/blog/

On Sat, Oct 3, 2009 at 2:22 AM, Domenic Santangelo <domenic@...> wrote:

nitin gupta wrote:

Thanks for your help. but this query will probably select "abcfooxyz" as well when "foo" is supplied. (untested), although it will definitely select "foo" in "foo bar" (tested)

$xpath->query("//div[contains(@class, '" . $class . "')]") 

How can we be more specific?

Try this example: http://westhoffswelt.de/blog/0036_xpath_to_select_html_by_class.html

@URL: Actually I am maintaining the module feedapi imagegrabber, which downloads images from external websites. Now sometimes the url I parse has spaces, so I am unable to decide whether or not  to percentage encode the URL, because percentage encoding will make this URL valid but will break the following URL:
http://www.google.com/search?q=hello

by converting it to 

http://www.google.com/search?q%3Dhello

"q=hello" is a query string, not strictly part of the path. I would strip the url to its component parts (parse_url) and encode the path, then re-append the query string.

http://us2.php.net/manual/en/function.parse-url.php
http://www.faqs.org/rfcs/rfc1738.html

HTH,

-D

Looking forward.

--
Regards,
Nitin Kumar Gupta
http://publicmind.in/blog/


On Sat, Oct 3, 2009 at 1:30 AM, Domenic Santangelo <domenic@...> wrote:
>
> nitin gupta wrote:
>
> for eg <div class="foo"></div> is selected by the following query.
> $class = "foo";
> $xpath->query("//*[@class = '".$class."']");
> But, this fails in case of multiple classes, i.e. does not select this :
> <div class="foo bar"> </div>
>
> The "contains" function would probably work, eg (untested):
> $xpath->query("//div[contains(@class, '" . $class . "')]");
>
> One more question: is this url valid : http://xyz.com/path with space.html
>
> Nope. You can escape the url if you just HAVE to have spaces:
>
> http://n00b.com/path%20with%20space.html
>
> but why not use dashes?
>
> http://pro.com/path-with-properly-indexed-spaces.html
>
> -Dom