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From Ian C <...@amham.net>
Subject Re: ODF to HTML
Date Tue, 02 Jun 2015 13:27:16 GMT
Hi

attached is a patch which generates and uses hn.class selectors.

Generated from the filter/odf/ directory via git diff



On Tue, Jun 2, 2015 at 12:43 AM, Peter Kelly <pmkelly@apache.org> wrote:

> (apologies if this is a duplicate - I sent from the wrong email address
> before)
>
> > On 31 May 2015, at 7:09 pm, Ian C <ian@amham.net <mailto:ian@amham.net>>
> wrote:
> >
> > We also need to take into account the style hierarchy. I see from some
> of the CSS documentation that there are mechanisms in place to manage that
> but have not looked in detail. Any advice Peter?
>
> First, some general comments - what I recommend is to first build up a
> custom data structure representing all the styles which can later be
> queried when needed, e.g. when you encounter an element in content.xml that
> has a particular style associated with it.
>
> In the Word filter, there are two classes used for this purpose: WordSheet
> and WordStyle (the former being a collection of the latter). These are
> defined in WordSheet.h and WordSheet.c. Early in the conversion process,
> the filter goes through the XML document containing the styles and builds
> up this data structure. This results in the code being able to deal with
> the styles at a higher-level of abstraction than examining the DOM tree of
> styles.xml directly.
>
> A while ago I made a start on the same thing for ODF - there’s ODFSheet
> and ODFStyle classes defined for the same purpose. So a good next step for
> tackling styles would be to traverse the DOM tree of styles.xml and
> populate this data structure, creating a new ODFStyle object for each style
> in the document, and adding them to the (single) ODFSheet object for the
> document. This data structure could then be used to generate the CSS text,
> as is done in the Word filter.
>
> > I just generated to div tags do we want that? Mapping to h1... hn could
> be a better way but not sure how to really map the correct heading styles
> to the hn.
>
> In the case of ODF, the information about what header to map to is
> (usually) available more directly than in OOXML. Both specs refer to it as
> the “outline level”. In an ODF document, heading outline levels start from
> 1 (just like HTML), but you also have the distinction between <text:h> and
> <text:p> elements, so you can know whether something is a heading or a
> regular paragraph.
>
> When encountering a <text:h> element, you can determine the outline level
> from the attribute, e.g.:
>
> <text:h text:style-name="Heading_20_1" text:outline-level="1">Headline
> One</text:h>
>
> So here the value ‘1’ is sufficient information to indicate that you need
> to create a h1 element. The style-name attribute is Heading_20_1, so the
> corresponding CSS would need to be:
>
> h1.Heading_20_1 {
> }
>
> and similarly for other levels, e.g.
>
> h2.Heading_20_2 {
> }
>
> Note that, as with your existing code, this would be generated separately
> from the content itself, solely based on the information in styles.xml, for
> the non-automatic styles.
>
> So I suggest separating buildCSS_Styles into two separate functions: One
> which populates the CSSSheet object associated with the package (that is,
> package->sheet, which I think is already created), and another which
> examines the ODFSheet object and populates the CSSSheet object.
>
> —
> Dr Peter M. Kelly
> pmkelly@apache.org
>
> PGP key: http://www.kellypmk.net/pgp-key <http://www.kellypmk.net/pgp-key>
> (fingerprint 5435 6718 59F0 DD1F BFA0 5E46 2523 BAA1 44AE 2966)
>
>


-- 
Cheers,

Ian C

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