diff options
| -rw-r--r-- | doc/users/jasonblevins.mdwn | 59 |
1 files changed, 55 insertions, 4 deletions
diff --git a/doc/users/jasonblevins.mdwn b/doc/users/jasonblevins.mdwn index a07d5d14b..8e51e7f7c 100644 --- a/doc/users/jasonblevins.mdwn +++ b/doc/users/jasonblevins.mdwn @@ -5,14 +5,18 @@ which, with some patches and a (currently unreleased) plugin, will convert inline LaTeX expressions to MathML. I'm working towards a patchset and instructions for others to do the same. -There is one thing that needs to be decided first: whether or not to -include [[sanitization|todo/svg]] of MathML in htmlscrubber (and while -we're at it, why not SVG). +I've setup a test ikiwiki [here](http://xbeta.org/colab/) where I've +started keeping a few notes on my progress. There is an example of +inline SVG on the homepage (note that the logo scales along with the +font size). There are a few example mathematical expressions in the +[sandbox](http://xbeta.org/colab/sandbox/). The MathML is generated +automatically from inline LaTeX expressions using an experimental +plugin I'm working on. My (also MathML-enabled) homepage: <http://jblevins.org/> (still using Blosxom...maybe one day I'll convert it to ikiwiki...) -Current issues of interest: +Current ikiwki issues of interest: * [[bugs/recentchanges_feed_links]] * [[bugs/HTML_inlined_into_Atom_not_necessarily_well-formed]] @@ -20,3 +24,50 @@ Current issues of interest: * [[todo/BibTeX]] * [[todo/svg]] * [[todo/Option_to_make_title_an_h1?]] + * [[bugs/SVG_files_not_recognized_as_images]] + +## MathML and SVG support + +So far, I've made some notes on sanitizing MathML and SVG via +htmlscrubber on the [[todo/svg]] todo item. + +I've also worked out some content-negotiation issues. First of all, +one needs to modify the default templates to use the +XHTML+MathML+SVG doctype (see e.g., this [patch][template-patch]). +For most browsers, the content type of the pages should be +`application/xhtml+xml`. The solution is easy if you want to +just send `application/xhtml+xml` to everybody: +just change the content type of `.html` files across the board. + +However, if you want to support browsers that don't accept +`application/xhtml+xml` (and those that will but say they +don't, such as IE with the MathPlayer plugin), then one +needs a `mod_rewrite` rule like the following: + + RewriteCond %{HTTP_ACCEPT} application\/xhtml\+xml [OR] + RewriteCond %{HTTP_USER_AGENT} (W3C.*Validator|MathPlayer) + RewriteRule \.html$ - [T=application/xhtml+xml] + +This solves the problem of MathML and inline SVG in static pages +but some additional work is required for dynamically generated +pages, like page previews, that are generated by `ikiwiki.cgi`. +We need to allow `ikiwiki.cgi` to set the content type dynamically +based on the `HTTP_CONTENT_TYPE` environment variable +(e.g., with the following [patch][cgi-patch]). Then, the following +rewrite rules can pass the correct content type to ikiwiki: + + RewriteCond %{HTTP_ACCEPT} application\/xhtml\+xml [OR] + RewriteCond %{HTTP_USER_AGENT} (W3C.*Validator|MathPlayer) + RewriteRule ikiwiki.cgi$ - [T=application/xhtml+xml] + +One final critical issue is that a production-ready setup needs to +implement some sort of on-the-fly error handling. If a user submits +an invalid LaTeX expression or SVG code (not malicious, just invalid) +and saves the page, then browsers like Firefox will halt processing of +the page, preventing any further viewing or editing. A less than +optimal solution is to force users to preview the page before saving. +That way if someone introduces invalid XHTML then they can't save the +page in the first place (unless they post directly to the right URL). + + [template-patch]: http://xbeta.org/gitweb/?p=xbeta/ikiwiki.git;a=blobdiff;f=templates/page.tmpl;h=380ef699fa72223744eb5c1ee655fb79aa6bce5b;hp=9084ba7e11e92a10528b2ab12c9b73cf7b0f40a7;hb=416d5d1b15b94e604442e4e209a30dee4b77b684;hpb=ececf4fb8766a4ff7eff943b3ef600be81a0df49 + [cgi-patch]: http://xbeta.org/gitweb/?p=xbeta/ikiwiki.git;a=commitdiff;h=fa538c375250ab08f396634135f7d79fce2a9d36 |