Auto merge of #18968 - mbrubeck:try, r=emilio

Use try syntax for Option where appropriate

- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes do not require tests because they are refactoring only

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/18968)
<!-- Reviewable:end -->
This commit is contained in:
bors-servo 2017-10-21 03:31:21 -05:00 committed by GitHub
commit 2b03a9974c
19 changed files with 65 additions and 180 deletions

View file

@ -2888,10 +2888,7 @@ impl Fragment {
/// Returns the 4D matrix representing this fragment's transform.
pub fn transform_matrix(&self, stacking_relative_border_box: &Rect<Au>) -> Option<Transform3D<f32>> {
let list = &self.style.get_box().transform;
let transform = match list.to_transform_3d_matrix(Some(stacking_relative_border_box)) {
Some(transform) => transform,
None => return None,
};
let transform = list.to_transform_3d_matrix(Some(stacking_relative_border_box))?;
let transform_origin = &self.style.get_box().transform_origin;
let transform_origin_x =
@ -3032,10 +3029,7 @@ impl<'a> Iterator for InlineStyleIterator<'a> {
self.primary_style_yielded = true;
return Some(&*self.fragment.style)
}
let inline_context = match self.fragment.inline_context {
None => return None,
Some(ref inline_context) => inline_context,
};
let inline_context = self.fragment.inline_context.as_ref()?;
let inline_style_index = self.inline_style_index;
if inline_style_index == inline_context.nodes.len() {
return None

View file

@ -384,10 +384,7 @@ impl LineBreaker {
-> Option<Fragment>
where I: Iterator<Item=Fragment>,
{
let mut result = match self.next_fragment(old_fragment_iter) {
None => return None,
Some(fragment) => fragment,
};
let mut result = self.next_fragment(old_fragment_iter)?;
loop {
let candidate = match self.next_fragment(old_fragment_iter) {

View file

@ -78,10 +78,7 @@ impl<'a, T> Iterator for PersistentListIterator<'a, T> where T: Send + Sync + 's
#[inline]
fn next(&mut self) -> Option<&'a T> {
let entry = match self.entry {
None => return None,
Some(entry) => entry,
};
let entry = self.entry?;
let value = &entry.value;
self.entry = match entry.next {
None => None,