cssparser-developers Mailing List for CSS Parser

Hi David,

> On 17 May 2017, at 20:54, David Schweinsberg <dav...@gm...> wrote:
> 
> Hi Vincent,
> 
> As Ronald says, cssparser would have to work in conjunction with other code to apply the style to the DOM. I've not used it myself, but would something like CSSelly (http://jodd.org/doc/csselly/) do the job?

Thanks for the link to csselly which I didn’t know. I’m adding it to my list of things to explore! TBH ATM it seems a bit complex to move away from CSS4J to CSSParser + something else bit if we get too many problems in the near future we may have to go down that route. 

Thanks
-Vincent

> 
> Best regards,
> David
> 
> On 17 May 2017 at 12:24, Ronald Brill <rb...@rb...> wrote:
> Hi Vincent,
> 
> thanks for considering CSSParser as alternative solution.
> CSSParser is a smaller/more focused solution; only parsing the css into some tree sturcture is the current focus of the project. There is no support to parse (X)Html and also no
> help for mixing the two trees into one.
> As far as i know there are two main use cases for CSSParser at the moment:
> * parsing a css for error detection or optimization and optional writing back the optimized version (The cleanup/optimization is not part of CSSParser)
> * parsing a css to support html processing
> 
> The second case is what is done by HtmlUnit (i'm also involved with this project). HtmlUnit uses NekoHtml to parse (X)Html and CSSParser for css. Then HtmlUnit uses both
> informations to simulate real browser behavior.
> If you like i can think a bit if your use case is someting that can be done with HtmlUnit - give me a sign and i will have a look ;-)
> 
> Outside of this i'm a bit curious about your case. Usually the css is separated from the Html by idea. Why you like to merge this?
> 
>         RBRi
> 
> On Tue, 16 May 2017 18:18:56 +0200 Vincent Massol wrote:
> >
> >Hi guys,
> >
> >On the XWiki project (http://xwiki.org) we're currently using CSS4J but it's painful (several bugs, no issue tracker, no mailing list) so we're considering migrating to another
> library and we're looking at CSSParser.
> >
> >We use CSS4J to do the following: apply some CSS content to XHTML.
> >
> >For example:
> >
> >CSS:
> >"span { color:red; }"
> >
> >XHTML:
> >...
> ><div id="xwikicontent">
> >  <p><span style="background: white;">Hello</span></p>
> ></div>
> >
> >
> >Result:
> >...
> ><div id="xwikicontent">
> >  <p><span style="background: white; color: red;">Hello</span></p>
> ></div>
> >
> >
> >Is that possible to do with CSSParser?
> >
> >FTR this is our code where we use CSS4J:
> >*
> https://github.com/xwiki/xwiki-platform/blob/30d27eb8ec23f7c5a28ca505a75f1c73f8fe0073/xwiki-platform-core/xwiki-platform-oldcore/src/main/java/com/xpn/xw
> iki/pdf/impl/PdfExportImpl.java#L460-L460
> >*
> https://github.com/xwiki/xwiki-platform/blob/30d27eb8ec23f7c5a28ca505a75f1c73f8fe0073/xwiki-platform-core/xwiki-platform-oldcore/src/main/java/com/xpn/xw
> iki/pdf/impl/PdfExportImpl.java#L506
> >
> >Thanks
> >-Vincent
> >------------------------------------------------------------------------------
> >Check out the vibrant tech community on one of the world's most
> >engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> >_______________________________________________
> >cssparser-developers mailing list
> >css...@li...
> >https://lists.sourceforge.net/lists/listinfo/cssparser-developers
> >
> 
> 
> ------------------------------------------------------------------------------
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> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> _______________________________________________
> cssparser-developers mailing list
> css...@li...
> https://lists.sourceforge.net/lists/listinfo/cssparser-developers
> 
> 
> 
> -- 
> David
> ------------------------------------------------------------------------------
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! http://sdm.link/slashdot_______________________________________________
> cssparser-developers mailing list
> css...@li...
> https://lists.sourceforge.net/lists/listinfo/cssparser-developers

Hi Ronald,

> On 17 May 2017, at 21:24, Ronald Brill <rb...@rb...> wrote:
> 
> Hi Vincent,
> 
> thanks for considering CSSParser as alternative solution.
> CSSParser is a smaller/more focused solution; only parsing the css into some tree sturcture is the current focus of the project. There is no support to parse (X)Html and also no
> help for mixing the two trees into one.
> As far as i know there are two main use cases for CSSParser at the moment:
> * parsing a css for error detection or optimization and optional writing back the optimized version (The cleanup/optimization is not part of CSSParser)
> * parsing a css to support html processing
> 
> The second case is what is done by HtmlUnit (i'm also involved with this project). HtmlUnit uses NekoHtml to parse (X)Html and CSSParser for css. Then HtmlUnit uses both
> informations to simulate real browser behavior.
> If you like i can think a bit if your use case is someting that can be done with HtmlUnit - give me a sign and i will have a look ;-)
> 
> Outside of this i'm a bit curious about your case. Usually the css is separated from the Html by idea. Why you like to merge this?

Thanks for your reply. Yes I agree that the use case may look weird from the outside :) So let me explain.

This is for the XWiki PDF export. The big steps are (better explained here: http://platform.xwiki.org/xwiki/bin/view/AdminGuide/Configuration#HCustomizingthePDFexportLook26Feel):

* Render a wiki page into XHTML
* Apply CSS4J to merge the pdf.css and user-customized CSS for PDF export into the generated XHTML
* Apply a xhtml2fo.xsl XSL stylesheet to generate XSL-FO
* Use Apache FOP to convert from XSL-FO to PDF

The problem is probably because XSL-FO doesn’t support defining the styles into CSS so in any case there’s a need to convert the CSS into something usable by XSL-FO processors such as Apache FOP. I did a quick search and found http://stackoverflow.com/questions/17495152/using-external-css-in-xsl-fo but that is far from simple and requires to convert CSS into some XSL.

Thanks
-Vincent

> 	RBRi
> 
> On Tue, 16 May 2017 18:18:56 +0200 Vincent Massol wrote:
>> 
>> Hi guys,
>> 
>> On the XWiki project (http://xwiki.org) we're currently using CSS4J but it's painful (several bugs, no issue tracker, no mailing list) so we're considering migrating to another
> library and we're looking at CSSParser.
>> 
>> We use CSS4J to do the following: apply some CSS content to XHTML.
>> 
>> For example:
>> 
>> CSS:
>> "span { color:red; }"
>> 
>> XHTML:
>> ...
>> <div id="xwikicontent">
>> <p><span style="background: white;">Hello</span></p>
>> </div>
>> 
>> 
>> Result:
>> ...
>> <div id="xwikicontent">
>> <p><span style="background: white; color: red;">Hello</span></p>
>> </div>
>> 
>> 
>> Is that possible to do with CSSParser?
>> 
>> FTR this is our code where we use CSS4J:
>> *
> https://github.com/xwiki/xwiki-platform/blob/30d27eb8ec23f7c5a28ca505a75f1c73f8fe0073/xwiki-platform-core/xwiki-platform-oldcore/src/main/java/com/xpn/xw
> iki/pdf/impl/PdfExportImpl.java#L460-L460
>> *
> https://github.com/xwiki/xwiki-platform/blob/30d27eb8ec23f7c5a28ca505a75f1c73f8fe0073/xwiki-platform-core/xwiki-platform-oldcore/src/main/java/com/xpn/xw
> iki/pdf/impl/PdfExportImpl.java#L506
>> 
>> Thanks
>> -Vincent
>> ------------------------------------------------------------------------------
>> Check out the vibrant tech community on one of the world's most
>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
>> _______________________________________________
>> cssparser-developers mailing list
>> css...@li...
>> https://lists.sourceforge.net/lists/listinfo/cssparser-developers
>> 
> 

Hi Vincent,

As Ronald says, cssparser would have to work in conjunction with other code
to apply the style to the DOM. I've not used it myself, but would something
like CSSelly (http://jodd.org/doc/csselly/) do the job?

Best regards,
David

On 17 May 2017 at 12:24, Ronald Brill <rb...@rb...> wrote:

> Hi Vincent,
>
> thanks for considering CSSParser as alternative solution.
> CSSParser is a smaller/more focused solution; only parsing the css into
> some tree sturcture is the current focus of the project. There is no
> support to parse (X)Html and also no
> help for mixing the two trees into one.
> As far as i know there are two main use cases for CSSParser at the moment:
> * parsing a css for error detection or optimization and optional writing
> back the optimized version (The cleanup/optimization is not part of
> CSSParser)
> * parsing a css to support html processing
>
> The second case is what is done by HtmlUnit (i'm also involved with this
> project). HtmlUnit uses NekoHtml to parse (X)Html and CSSParser for css.
> Then HtmlUnit uses both
> informations to simulate real browser behavior.
> If you like i can think a bit if your use case is someting that can be
> done with HtmlUnit - give me a sign and i will have a look ;-)
>
> Outside of this i'm a bit curious about your case. Usually the css is
> separated from the Html by idea. Why you like to merge this?
>
>         RBRi
>
> On Tue, 16 May 2017 18:18:56 +0200 Vincent Massol wrote:
> >
> >Hi guys,
> >
> >On the XWiki project (http://xwiki.org) we're currently using CSS4J but
> it's painful (several bugs, no issue tracker, no mailing list) so we're
> considering migrating to another
> library and we're looking at CSSParser.
> >
> >We use CSS4J to do the following: apply some CSS content to XHTML.
> >
> >For example:
> >
> >CSS:
> >"span { color:red; }"
> >
> >XHTML:
> >...
> ><div id="xwikicontent">
> >  <p><span style="background: white;">Hello</span></p>
> ></div>
> >
> >
> >Result:
> >...
> ><div id="xwikicontent">
> >  <p><span style="background: white; color: red;">Hello</span></p>
> ></div>
> >
> >
> >Is that possible to do with CSSParser?
> >
> >FTR this is our code where we use CSS4J:
> >*
> https://github.com/xwiki/xwiki-platform/blob/
> 30d27eb8ec23f7c5a28ca505a75f1c73f8fe0073/xwiki-platform-
> core/xwiki-platform-oldcore/src/main/java/com/xpn/xw
> iki/pdf/impl/PdfExportImpl.java#L460-L460
> >*
> https://github.com/xwiki/xwiki-platform/blob/
> 30d27eb8ec23f7c5a28ca505a75f1c73f8fe0073/xwiki-platform-
> core/xwiki-platform-oldcore/src/main/java/com/xpn/xw
> iki/pdf/impl/PdfExportImpl.java#L506
> >
> >Thanks
> >-Vincent
> >-----------------------------------------------------------
> -------------------
> >Check out the vibrant tech community on one of the world's most
> >engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> >_______________________________________________
> >cssparser-developers mailing list
> >css...@li...
> >https://lists.sourceforge.net/lists/listinfo/cssparser-developers
> >
>
>
> ------------------------------------------------------------
> ------------------
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> _______________________________________________
> cssparser-developers mailing list
> css...@li...
> https://lists.sourceforge.net/lists/listinfo/cssparser-developers
>



-- 
David

Hi Vincent,

thanks for considering CSSParser as alternative solution.
CSSParser is a smaller/more focused solution; only parsing the css into some tree sturcture is the current focus of the project. There is no support to parse (X)Html and also no 
help for mixing the two trees into one.
As far as i know there are two main use cases for CSSParser at the moment:
* parsing a css for error detection or optimization and optional writing back the optimized version (The cleanup/optimization is not part of CSSParser)
* parsing a css to support html processing

The second case is what is done by HtmlUnit (i'm also involved with this project). HtmlUnit uses NekoHtml to parse (X)Html and CSSParser for css. Then HtmlUnit uses both 
informations to simulate real browser behavior.
If you like i can think a bit if your use case is someting that can be done with HtmlUnit - give me a sign and i will have a look ;-)

Outside of this i'm a bit curious about your case. Usually the css is separated from the Html by idea. Why you like to merge this?

	RBRi

On Tue, 16 May 2017 18:18:56 +0200 Vincent Massol wrote:
>
>Hi guys,
>
>On the XWiki project (http://xwiki.org) we're currently using CSS4J but it's painful (several bugs, no issue tracker, no mailing list) so we're considering migrating to another 
library and we're looking at CSSParser.
>
>We use CSS4J to do the following: apply some CSS content to XHTML.
>
>For example:
>
>CSS:
>"span { color:red; }"
>
>XHTML:
>...
><div id="xwikicontent">
>  <p><span style="background: white;">Hello</span></p>
></div>
>
>
>Result:
>...
><div id="xwikicontent">
>  <p><span style="background: white; color: red;">Hello</span></p>
></div>
>
>
>Is that possible to do with CSSParser?
>
>FTR this is our code where we use CSS4J:
>* 
https://github.com/xwiki/xwiki-platform/blob/30d27eb8ec23f7c5a28ca505a75f1c73f8fe0073/xwiki-platform-core/xwiki-platform-oldcore/src/main/java/com/xpn/xw
iki/pdf/impl/PdfExportImpl.java#L460-L460
>* 
https://github.com/xwiki/xwiki-platform/blob/30d27eb8ec23f7c5a28ca505a75f1c73f8fe0073/xwiki-platform-core/xwiki-platform-oldcore/src/main/java/com/xpn/xw
iki/pdf/impl/PdfExportImpl.java#L506
>
>Thanks
>-Vincent
>------------------------------------------------------------------------------
>Check out the vibrant tech community on one of the world's most
>engaging tech sites, Slashdot.org! http://sdm.link/slashdot
>_______________________________________________
>cssparser-developers mailing list
>css...@li...
>https://lists.sourceforge.net/lists/listinfo/cssparser-developers
>

Hi guys,

On the XWiki project (http://xwiki.org) we’re currently using CSS4J but it’s painful (several bugs, no issue tracker, no mailing list) so we’re considering migrating to another library and we’re looking at CSSParser.

We use CSS4J to do the following: apply some CSS content to XHTML.

For example:

CSS:
"span { color:red; }"

XHTML:
...
<div id=“xwikicontent">
  <p><span style="background: white;">Hello</span></p>
</div>
…

Result:
...
<div id=“xwikicontent">
  <p><span style="background: white; color: red;">Hello</span></p>
</div>
…

Is that possible to do with CSSParser?

FTR this is our code where we use CSS4J:
* https://github.com/xwiki/xwiki-platform/blob/30d27eb8ec23f7c5a28ca505a75f1c73f8fe0073/xwiki-platform-core/xwiki-platform-oldcore/src/main/java/com/xpn/xwiki/pdf/impl/PdfExportImpl.java#L460-L460
* https://github.com/xwiki/xwiki-platform/blob/30d27eb8ec23f7c5a28ca505a75f1c73f8fe0073/xwiki-platform-core/xwiki-platform-oldcore/src/main/java/com/xpn/xwiki/pdf/impl/PdfExportImpl.java#L506

Thanks
-Vincent