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Fix confusing push_or_mutate API

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This fixes a bug when recalculating border collapsing for an existing table
now. The bug was caused by using `push_or_mutate` which has no effect if there
is already a value at the specified index.

The fix switches incorrect `push_or_mutate` calls to use `push_or_set`
instead. It also renames `push_or_mutate` to `get_mut_or_push` which I think
is a less-confusing name for this method.
This commit is contained in:
Matt Brubeck 2016-02-29 13:05:46 -08:00
parent 4bcdbe6d56
commit 4dc9d8b1c5
2 changed files with 11 additions and 9 deletions
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13
components/layout/table.rs
View file

@ -658,21 +658,22 @@ pub struct ColumnComputedInlineSize {
}
pub trait VecExt<T> {
fn push_or_set(&mut self, index: usize, value: T);
fn push_or_mutate(&mut self, index: usize, zero: T) -> &mut T;
fn push_or_set(&mut self, index: usize, value: T) -> &mut T;
fn get_mut_or_push(&mut self, index: usize, zero: T) -> &mut T;
}
impl<T> VecExt<T> for Vec<T> {
fn push_or_set(&mut self, index: usize, value: T) {
fn push_or_set(&mut self, index: usize, value: T) -> &mut T {
if index < self.len() {
self[index] = value
} else {
debug_assert!(index == self.len());
self.push(value)
}
&mut self[index]
}
fn push_or_mutate(&mut self, index: usize, zero: T) -> &mut T {
fn get_mut_or_push(&mut self, index: usize, zero: T) -> &mut T {
if index >= self.len() {
debug_assert!(index == self.len());
self.push(zero)
@ -697,7 +698,7 @@ fn perform_border_collapse_for_row(child_table_row: &mut TableRowFlow,
.enumerate() {
child_table_row.final_collapsed_borders.inline.push_or_set(i, *this_inline_border);
let inline_spacing = inline_spacing.push_or_mutate(i, Au(0));
let inline_spacing = inline_spacing.get_mut_or_push(i, Au(0));
*inline_spacing = cmp::max(*inline_spacing, this_inline_border.width)
}
@ -733,7 +734,7 @@ fn perform_border_collapse_for_row(child_table_row: &mut TableRowFlow,
.block_end
.iter()
.enumerate() {
let next_block = next_block.push_or_mutate(i, *this_block_border);
let next_block = next_block.push_or_set(i, *this_block_border);
match next_block_borders {
NextBlockCollapsedBorders::FromNextRow(next_block_borders) => {
if next_block_borders.len() > i {