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

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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

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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
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30
components/script/dom/element.rs
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@ -1040,24 +1040,20 @@ impl Element {
// https://dom.spec.whatwg.org/#locate-a-namespace-prefix
pub fn lookup_prefix(&self, namespace: Namespace) -> Option<DOMString> {
for node in self.upcast::<Node>().inclusive_ancestors() {
match node.downcast::<Element>() {
Some(element) => {
// Step 1.
if *element.namespace() == namespace {
if let Some(prefix) = element.GetPrefix() {
return Some(prefix);
}
}
let element = node.downcast::<Element>()?;
// Step 1.
if *element.namespace() == namespace {
if let Some(prefix) = element.GetPrefix() {
return Some(prefix);
}
}
// Step 2.
for attr in element.attrs.borrow().iter() {
if attr.prefix() == Some(&namespace_prefix!("xmlns")) &&
**attr.value() == *namespace {
return Some(attr.LocalName());
}
}
},
None => return None,
// Step 2.
for attr in element.attrs.borrow().iter() {
if attr.prefix() == Some(&namespace_prefix!("xmlns")) &&
**attr.value() == *namespace {
return Some(attr.LocalName());
}
}
}
None