Refactor bidi and add reordering function
- Rename bidi-override enum to bidi-direction, including entries. This
better reflects the general nature of it.
- Remove UTF-8-related bidi-functions, given it would be too complicated
to reflect in an API and opens up some very difficult challenges.
- Rename *_preprocess to *_preprocess_paragraph and return the resolved
paragraph embedding level as an optional out-parameter. This is the
only way to meaningfully handle large chunks of text with paragraphs
of different embedding levels.
- Separate the get_paragraph_level() function into two for
isolated-paragraphs and whole paragraphs. This simplifies it a lot, as
we don't have the crazy bool-flag-mess any more.
- Add a grapheme_bidirectional_reorder_line function that directly
operates on preprocessed data and returns the reordered string without
any additionally necessary buffering. For this the
get_line_embedding_levels had to be made a bit more general to allow
different ways of writing the levels into the output.
This function makes use of the mirror-LUT and has a small section
still commented out regarding the proper inversion of grapheme
clusters that will need more investigation.
Signed-off-by: Laslo Hunhold <dev@frign.de>
3 files changed
