Function unicode_bidi::compute_bidi_info_for_para

pub(crate) fn compute_bidi_info_for_para<'a, D: BidiDataSource, T: TextSource<'a> + ?Sized>(
    data_source: &D,
    para: &ParagraphInfo,
    is_pure_ltr: bool,
    text: &'a T,
    original_classes: &[BidiClass],
    processing_classes: &mut [BidiClass],
    levels: &mut Vec<Level>
)

The core of BidiInfo initialization, factored out into a function that both the utf-8 and utf-16 versions of BidiInfo can use.