diff options
Diffstat (limited to 'components/layout/inline.rs')
| -rw-r--r-- | components/layout/inline.rs | 26 |
1 files changed, 21 insertions, 5 deletions
diff --git a/components/layout/inline.rs b/components/layout/inline.rs index 1ce18b562bb..60edeedff4b 100644 --- a/components/layout/inline.rs +++ b/components/layout/inline.rs @@ -962,13 +962,29 @@ impl InlineFlow { Some(ref runs) => runs[run_count - run_idx - 1], // reverse order for RTL runs None => (line.range, bidi::Level::ltr()) }; + + struct MaybeReverse<I> { + iter: I, + reverse: bool, + } + + impl<I: DoubleEndedIterator> Iterator for MaybeReverse<I> { + type Item = I::Item; + + fn next(&mut self) -> Option<I::Item> { + if self.reverse { + self.iter.next_back() + } else { + self.iter.next() + } + } + } + // If the bidi embedding direction is opposite the layout direction, lay out this // run in reverse order. - let reverse = level.is_ltr() != is_ltr; - let fragment_indices = if reverse { - (range.end().get() - 1..range.begin().get() - 1).step_by(-1) - } else { - (range.begin().get()..range.end().get()).step_by(1) + let fragment_indices = MaybeReverse { + iter: range.begin().get()..range.end().get(), + reverse: level.is_ltr() != is_ltr, }; for fragment_index in fragment_indices { |