Martin Duerst wrote:
Good to know. The following are potential problems:
- Can the properties be set for each mode individually?
- Can the properties change based on context? As a simple
example, attributes in XML can be quoted with single quotes
or with double quotes. In the attribute value, the 'other'
quote can then be used literally. So if we have something
like
<element attr1="What's up?" attr2='He cried "Help!" and ran away.' />
1 2 1 1 2 2 1
then for the places marked 1, which are XML syntax, we want to
change the properties (e.g. to LTR), but for the cases marked
with 2, which are content, we do not want to change the properties.
Would such a thing be possible?
- In our current approach, we not only change the properties of some
characters, but also introduce additional embedding (or occasionally
override) levels. Is this possible in your implementation?
Have you taken a look at the source for nxml mode? You might be able to
hack it up do do something like this. As I understand it, in Emacs you
can set whatever properties you like on each character in a buffer. See
node 32.19, "Text Properties", of the Elisp manual.
Now the interesting possibility presents itself, which is to add
Unicode-related "special" (ie. built-in) text properties. In
particular, directional class. Then allow the user to override the
Unicode-defined class for any particular character or set of chars in a
buffer. So in your example above, the nxml parser identifies weakly
directional chars in the XML syntax, and switches their
"unicode-directionality" property to strong LTR. Voila! The bidi
reordering obeys the user-set directionality and does the right thing.
-g
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