1 / 44

Customising the nwalsh DSSSL stylesheets

Customising the nwalsh DSSSL stylesheets. nik@FreeBSD.org. Why customise?. Fit in with corporate look and feel Support an additional language Support custom DocBook DTD extensions Fix bugs Adjust the documented parameters. Creating a customisation layer.

stella
Télécharger la présentation

Customising the nwalsh DSSSL stylesheets

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Customising the nwalsh DSSSL stylesheets nik@FreeBSD.org

  2. Why customise? • Fit in with corporate look and feel • Support an additional language • Support custom DocBook DTD extensions • Fix bugs • Adjust the documented parameters

  3. Creating a customisation layer • DSSSL processor is directed to one stylesheet • Stylesheets can reference other stylesheets • First definition of variable or code takes precedence over later definitions • Your customisation references nwalsh’s stylesheets, and just contains overrides

  4. Simplest possible customisation • The empty stylesheet <!DOCTYPE style-sheet PUBLIC "-//James Clark//DTD DSSSL Style Sheet//EN" [ <!ENTITY parent-stylesheet SYSTEM “/path/to/docbook.dsl" CDATA DSSSL> ]> <style-sheet> <style-specification use="docbook"> <style-specification-body> </style-specification-body> </style-specification> <external-specification id="docbook" document=“parent-stylesheet"> </style-sheet> % jade –c /path/to/catalog –d custom.dsl –t sgml file.sgml

  5. Customising using documented variables • nwalsh stylesheets have wide range of tweakable knobs • All take the form (define variable-name value) • Some historical conventions for variable names %var-name% Simple variable $var-name$ Code that returns a value • Newer variables are not decorated in this way • See the documentation at http://www.nwalsh.com/docbook/dsssl/doc/

  6. A trivial customisation <!DOCTYPE style-sheet PUBLIC "-//James Clark//DTD DSSSL Style Sheet//EN" [ <!ENTITY parent-stylesheet SYSTEM “/path/to/docbook.dsl" CDATA DSSSL> ]> <style-sheet> <style-specification use="docbook"> <style-specification-body> </style-specification-body> </style-specification> <external-specification id="docbook" document=“parent-stylesheet"> </style-sheet> (define %generate-article-toc% #t) % jade –c /path/to/catalog –d custom.dsl –t sgml file.sgml

  7. Taking things further • Sharing customisation options between print and HTML stylesheets • A tour of the stylesheet structure • Extending DocBook, with stylesheet support • Writing your own DSSSL, rewriting the stylesheets • Customising your customisations

  8. Sharing options between print and HTML stylesheets • Many configuration options are identical • Useful to have one stylesheet for print and HTML output • Avoids duplicate code • Requires use of parameter entities

  9. In the Document Type Declaration <!DOCTYPE style-sheet PUBLIC "-//James Clark//DTD DSSSL Style Sheet//EN" [ <!ENTITY % output.html “IGNORE”> <!ENTITY % output.print “IGNORE”> <![ %output.html; [ <!ENTITY parent-stylesheet SYSTEM “/path/to/html/docbook.dsl" CDATA DSSSL> ]]> <![ %output.print; [ <!ENTITY parent-stylesheet SYSTEM “/path/to/print/docbook.dsl” CDATA DSSSL> ]]> ]> <style-sheet> <style-specification use="docbook"> . . .

  10. In the stylesheet body <style-sheet> <style-specification use="docbook"> <style-specification-body> <![ %output.html; [ <!-- HTML specific customisations --> (define %generate-article-toc% #t) ]]> <![ %output.print; [ <!-- Print specific customisations --> ]]> <!-- Non-specific customisations --> </style-specification-body> </style-specification> <external-specification id="docbook" document=“parent-stylesheet"> </style-sheet>

  11. On the command line • For HTML % jade –i output.html –c /path/to/catalog –d custom.dsl –t sgml file.sgml • For Postscript % jade –i output.print –c /path/to/catalog –d custom.dsl –t tex file.sgml

  12. Can be further extended • %output.html; • %output.print.ps; • %output.print.pdf; • %output.print.rtf; …

  13. A tour of the stylesheets • Three main directories of interest html/ HTML stylesheet files print/ Print stylesheet files common/ Common code shared between them • Stylesheet “root” is html/docbook.dsl or print/docbook.dsl respectively • Other files handle chunks of work

  14. The other files • Naming scheme is obvious when you know dbadmon.dsl Admonitions (<tip>, <note>, etc) dbacallou.dsl Callouts dbfootn.dsl Footnotes dblink.dsl<xref>, <ulink>, etc dbrfntry.dsl <refentry>, etc dbverb.dsl Verbatim displays (<screen>, <literallayout>, etc) • And so on

  15. Two types of DSSSL code • Code that describes how an element should be processed (element element-name ... ) • Code that defines functions used in processing elements (define function-name ... ) • Element processing may be self-contained, or it may rely on multiple functions

  16. Tracing an element’s definition % cd html % grep ‘element emphasis’ *.dsl dbinline.dsl:(element emphasis ($italic-seq$)) % grep ‘italic-seq’ *.dsl dbgloss.dsl: ($italic-seq$)) dbgloss.dsl: ($italic-seq$)))) dbgloss.dsl: ($italic-seq$)) dbgloss.dsl: ($italic-seq$)))) dbhtml.dsl:(define ($italic-seq$ #!optional (sosofo (process-children))) dbhtml.dsl:(define ($bold-italic-seq$ #!optional (sosofo (process-children))) dbinline.dsl:(element medialabel ($italic-seq$)) dbinline.dsl: ($italic-seq$) dbinline.dsl:(element citetitle ($italic-seq$)) dbinline.dsl:(element emphasis ($italic-seq$)) dbinline.dsl:(element foreignphrase ($italic-seq$)) dbinline.dsl:(element wordasword ($italic-seq$)) dblink.dsl: ($italic-seq$)))

  17. Tracing an element’s definition % cd html % grep ‘element emphasis’ *.dsl dbinline.dsl:(element emphasis ($italic-seq$)) % grep ‘italic-seq’ *.dsl dbgloss.dsl: ($italic-seq$)) dbgloss.dsl: ($italic-seq$)))) dbgloss.dsl: ($italic-seq$)) dbgloss.dsl: ($italic-seq$)))) dbhtml.dsl:(define ($italic-seq$ #!optional (sosofo (process-children))) dbhtml.dsl:(define ($bold-italic-seq$ #!optional (sosofo (process-children))) dbinline.dsl:(element medialabel ($italic-seq$)) dbinline.dsl: ($italic-seq$) dbinline.dsl:(element citetitle ($italic-seq$)) dbinline.dsl:(element emphasis ($italic-seq$)) dbinline.dsl:(element foreignphrase ($italic-seq$)) dbinline.dsl:(element wordasword ($italic-seq$)) dblink.dsl: ($italic-seq$)))

  18. Tracing an element’s definition dbhtml.dsl . . . (define ($bold-seq$ #!optional (sosofo (process-children))) (make element gi: "B" attributes: (list (list "CLASS" (gi))) sosofo)) (define ($italic-seq$ #!optional (sosofo (process-children))) (make element gi: "I" attributes: (list (list "CLASS" (gi))) sosofo)) (define ($bold-italic-seq$ #!optional (sosofo (process-children))) (make element gi: "B" attributes: (list (list "CLASS" (gi))) (make element gi: "I" sosofo)))

  19. Tracing an element’s definition % cd ../print % grep ‘element emphasis’ *.dsl dbinline.dsl:(element emphasis ($italic-seq$)) % grep 'italic-seq' *.dsl dbgloss.dsl:(element glosssee ($italic-seq$)) dbgloss.dsl: ($italic-seq$ (literal (gentext-element-name (current-node)) dbgloss.dsl: ($italic-seq$ (literal (gentext-element-name (current-node)) dbgloss.dsl: ($italic-seq$ (literal ", "))) dbgloss.dsl: ($italic-seq$)) dbgloss.dsl: ($italic-seq$)))) dbgloss.dsl: ($italic-seq$)) dbinline.dsl:(element medialabel ($italic-seq$)) dbinline.dsl: ($italic-seq$) dbinline.dsl:(element citetitle ($italic-seq$)) dbinline.dsl:(element emphasis ($italic-seq$)) dbinline.dsl:(element foreignphrase ($italic-seq$)) dbinline.dsl:(element wordasword ($italic-seq$)) dblink.dsl: ($italic-seq$))) dbprint.dsl:(define ($italic-seq$ #!optional (sosofo (process-children))) dbprint.dsl:(define ($bold-italic-seq$ #!optional (sosofo (process-children)))

  20. Tracing an element’s definition % cd ../print % grep ‘element emphasis’ *.dsl dbinline.dsl:(element emphasis ($italic-seq$)) % grep 'italic-seq' *.dsl dbgloss.dsl:(element glosssee ($italic-seq$)) dbgloss.dsl: ($italic-seq$ (literal (gentext-element-name (current-node)) dbgloss.dsl: ($italic-seq$ (literal (gentext-element-name (current-node)) dbgloss.dsl: ($italic-seq$ (literal ", "))) dbgloss.dsl: ($italic-seq$)) dbgloss.dsl: ($italic-seq$)))) dbgloss.dsl: ($italic-seq$)) dbinline.dsl:(element medialabel ($italic-seq$)) dbinline.dsl: ($italic-seq$) dbinline.dsl:(element citetitle ($italic-seq$)) dbinline.dsl:(element emphasis ($italic-seq$)) dbinline.dsl:(element foreignphrase ($italic-seq$)) dbinline.dsl:(element wordasword ($italic-seq$)) dblink.dsl: ($italic-seq$))) dbprint.dsl:(define ($italic-seq$ #!optional (sosofo (process-children))) dbprint.dsl:(define ($bold-italic-seq$ #!optional (sosofo (process-children)))

  21. Tracing an element’s definition dbprint.dsl . . . (define ($bold-seq$ #!optional (sosofo (process-children))) (make sequence font-weight: 'bold sosofo)) (define ($italic-seq$ #!optional (sosofo (process-children))) (make sequence font-posture: 'italic sosofo)) (define ($bold-italic-seq$ #!optional (sosofo (process-children))) (make sequence font-weight: 'bold font-posture: 'italic sosofo))

  22. Other …-seq functions % grep -- -seq *.dsl | grep ‘(define’ dbhtml.dsl:(define ($bold-seq$ #!optional (sosofo (process-children))) dbhtml.dsl:(define ($italic-seq$ #!optional (sosofo (process-children))) dbhtml.dsl:(define ($bold-italic-seq$ #!optional (sosofo (process-children))) dbhtml.dsl:(define ($mono-seq$ #!optional (sosofo (process-children))) dbhtml.dsl:(define ($italic-mono-seq$ #!optional (sosofo (process-children))) dbhtml.dsl:(define ($bold-mono-seq$ #!optional (sosofo (process-children)))

  23. Rendering <emphasis> in bold <style-sheet> <style-specification use="docbook"> <style-specification-body> <![ %output.html; [ <!-- HTML specific customisations --> ]]> <![ %output.print; [ <!-- Print specific customisations --> ]]> <!-- Non-specific customisations --> (element emphasis ($bold-seq$)) </style-specification-body> </style-specification> <external-specification id="docbook" document=“parent-stylesheet"> </style-sheet>

  24. Rendering <emphasis> in bold <style-sheet> <style-specification use="docbook"> <style-specification-body> <![ %output.html; [ <!-- HTML specific customisations --> (element emphasis ($bold-seq$)) ]]> <![ %output.print; [ <!-- Print specific customisations --> ]]> <!-- Non-specific customisations --> </style-specification-body> </style-specification> <external-specification id="docbook" document=“parent-stylesheet"> </style-sheet>

  25. Rendering based on attribute Q: How to make <emphasis> appear in italic, and <emphasis role=“bold”> appear in bold?

  26. Rendering based on attribute • Find another element with similar behaviour written in the stylesheets <literallayout> and <literallayout class=“monospaced”>

  27. Rendering based on attribute • Look at the code for that element % grep ‘element literallayout’ *.dsl dbverb.dsl:(element literallayout dbverb.dsl (element literallayout (if (equal? (attribute-string "class") (normalize "monospaced")) ($verbatim-display$ %indent-literallayout-lines% %number-literallayout-lines%) ($linespecific-display$ %indent-literallayout-lines% %number-literallayout-lines%)))

  28. Rendering based on attribute • Shamelessly ‘borrow’ the ideas <style-sheet> <style-specification use="docbook"> <style-specification-body> <![ %output.html; [ ]]> <!-- HTML specific customisations --> <![ %output.print; [ ]]> <!-- Print specific customisations --> <!-- Non-specific customisations --> (element emphasis (if (equal? (attribute-string “role") (normalize “bold")) ($bold-seq$) ($italic-seq$)) </style-specification-body> </style-specification> <external-specification id="docbook" document=“parent-stylesheet"> </style-sheet>

  29. A look in common/ • common/ contains shared files • dbcommon.dsl • Shared variables • Shared functions • dbl1*.dsl • Language specific code (e.g., ordering of author names) • dbl1*.ent • Entity definitions for language specific text (“Chapter”, “Kapitel”, “Chapitre”, etc)

  30. Supporting an extended DTD • Reasons to extend DocBook • Add environment specific elements • Tighten up content models • Add new common attributes • Stylesheets do not automatically understand new elements • Content will appear in red • See “(default …” in print/docbook.dsl and html/docbook.dsl

  31. An extended DTD <!ENTITY % docbook.org PUBLIC “-//OASIS//DTD DocBook V4.1//EN”> %docbook.org; <!ELEMENT HostID - - ((%cptr.char.mix;)+)> <!ATTLIST HostID -- Role: More specific information about this host ID. If not specified then the default is 'hostname'. -- Role (Hostname |Domainname |FQDN |IPAddr |IP6Addr |Netmask |MAC) #IMPLIED %common.attrib; >

  32. Supporting the extension <style-sheet> <style-specification use="docbook"> <style-specification-body> <![ %output.html; [ <!-- HTML specific customisations --> ]]> <![ %output.print; [ <!-- Print specific customisations --> ]]> <!-- Non-specific customisations --> (element hostid ($mono-seq$)) </style-specification-body> </style-specification> <external-specification id="docbook" document=“parent-stylesheet"> </style-sheet>

  33. Supporting the extension <style-sheet> <style-specification use="docbook"> <style-specification-body> <![ %output.html; [ <!-- HTML specific customisations --> (element hostid ($mono-seq$) ]]> <![ %output.print; [ <!-- Print specific customisations --> (element hostid ($italic-seq$) ]]> <!-- Non-specific customisations --> </style-specification-body> </style-specification> <external-specification id="docbook" document=“parent-stylesheet"> </style-sheet>

  34. Customising a customisation • A chain of stylesheets can be built up Further Customisation layer-3.dsl New functions And variables layer-2.dsl / custom.dsl nwalsh stylesheets html.dsl / print.dsl

  35. Multi-lingual CiteRefEntry links Q: Using <citerefentry> you can generate man page references of the form “ls(1)”, with markup like <citerefentry> <refentrytitle>ls</refentrytitle> <manvolnum>1</manvolnum> </citerefentry> Man to HTML gateways exist. How do you • Generate the HTML link? • Make sure that the link is for the correct language? • Allow this functionality to be turned on or off?

  36. Step 1: Find citerefentry dbverb.dsl (element citerefentry (if %refentry-xref-italic% ($italic-seq$) ($char-seq$))) dbrfntry.dsl (element refentrytitle ($charseq$) … (element manvolnum (if %refentry-xref-manvolnum% (sosofo-append (literal “(“) (process-children) (literal “)”) (empty-sosofo)))

  37. Step 2: Rewrite citerefentry in layer-2.dsl <![ %output.html; [ <!-- HTML specific customisations --> (define %refentry-xref-link% #f) (define $create-refentry-xref-link$) (literal “”) (element citerefentry (let ((href ($create-refentry-xref-link%))) (if %refentry-xref-link% (make element gi: “A” attributes: (list (list “HREF” href)) (if %refentry-xref-italic% ($italic-seq$) ($charseq$))) (if %refentry-xref-italic% ($italic-seq$) ($charseq$))))) ]]>

  38. Step 3: Create layer-3.dsl <!DOCTYPE style-sheet PUBLIC "-//James Clark//DTD DSSSL Style Sheet//EN" [ <!ENTITY % output.html “IGNORE”> <!ENTITY % output.print “IGNORE”> <!ENTITY parent-stylesheet SYSTEM “layer-2.dsl" CDATA DSSSL> <style-sheet> <style-specification use="docbook"> <style-specification-body> </style-specification-body> </style-specification> <external-specification id="docbook" document=“parent-stylesheet"> </style-sheet> % jade –i output.html –c /path/to/catalog –d layer-3.dsl –t sgml file.sgml

  39. Step 4: Turn on the linking <!-- layer-3.dsl --> <style-sheet> <style-specification use="docbook"> <style-specification-body> <![ %output.html; [ <!-- HTML specific customisations --> (define %refentry-xref-link% #t) ]]> <![ %output.print; [ <!-- Print specific customisations --> ]]> <!-- Non-specific customisations --> </style-specification-body> </style-specification> <external-specification id="docbook" document=“parent-stylesheet"> </style-sheet>

  40. Step 5: Create the link function • URL’s take the form http://www.FreeBSD.org/cgi/man.cgi?query=refentrytitle&sektion=manvolnum • Code to implement this <![ %output.html; [ <!-- HTML specific customisations --> (define %refentry-xref-link% #t) (define ($create-refentry-xref-link$ #!optional (n (current-node))) (let ((r (select-elements (children n) (normalize “refentrytitle”))) (m (select-elements (children n) (normalize “manvolnum”)))) (string-append http://www.FreeBSD.org/cgi/man.cgi?query= (data r) “&” “sektion=“ (data m)))) ]]>

  41. Step 6: Use the new layer-3.dsl • Now all you have to do is use the new layer-3.dsl in your commands % jade –i output.html –c /path/to/catalog –d layer-3.dsl –t sgml file.sgml

  42. A German link function • URL’s take the form http://www.de.FreeBSD.org/cgi/man.cgi?query=refentrytitle(manvolnum) • Code to implement this (german-layer-3.dsl) <![ %output.html; [ <!-- HTML specific customisations --> (define %refentry-xref-link% #t) (define ($create-refentry-xref-link$ #!optional (n (current-node))) (let ((r (select-elements (children n) (normalize “refentrytitle”))) (m (select-elements (children n) (normalize “manvolnum”)))) (string-append http://www.de.FreeBSD.org/cgi/man.cgi?query= (data r) “(” (data m) “)”))) ]]> % jade –i output.html –c /path/to/catalog –d german-layer-3.dsl –t sgml file.sgml

  43. An extended link function <citerefentry vendor=“xfree86”> <refentrytitle>xdm</refentrytitle> <manvolnum>1</manvolnum> </citerefentry> <![ %output.html; [ <!-- HTML specific customisations --> (define %refentry-xref-link% #t) (define ($create-refentry-xref-link$ #!optional (n (current-node))) (let* ((r (select-elements (children n) (normalize "refentrytitle"))) (m (select-elements (children n) (normalize "manvolnum"))) (v (attribute-string (normalize "vendor") n)) (u (string-append "http://www.FreeBSD.org/cgi/man.cgi?query=" (data r) "&" "sektion=" (data m)))) (case v (("xfree86") (string-append u "&" "manpath=XFree86+4.0.2")) (("netbsd") (string-append u "&" "manpath=NetBSD+1.5")) (else u)))) ]]>

  44. A sample infrastructure % cd doc/en_US.ISO_8859-1/books/faq % make “FORMATS=html ps pdf”

More Related