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Avoid extra O(n) scan in validate_and_extract

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Also `debug_assert!`s that `splitn` was called with the
correct `count` argument.
This commit is contained in:
Tamir Duberstein 2015-05-26 13:14:39 -04:00
parent 8759d42559
commit a3d463093e
1 changed files with 21 additions and 11 deletions
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32
components/script/dom/bindings/utils.rs
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@ -637,19 +637,29 @@ pub fn validate_and_extract(namespace: Option<DOMString>, qualified_name: &str)
// Step 2.
try!(validate_qualified_name(qualified_name));
let (prefix, local_name) = if qualified_name.contains(":") {
// Step 5.
let mut parts = qualified_name.splitn(2, ':');
let prefix = parts.next().unwrap();
debug_assert!(!prefix.is_empty());
let local_name = parts.next().unwrap();
debug_assert!(!local_name.contains(":"));
(Some(prefix), local_name)
} else {
(None, qualified_name)
let colon = ':';
// Step 5.
let mut parts = qualified_name.splitn(2, colon);
let (maybe_prefix, local_name) = {
let maybe_prefix = parts.next();
let maybe_local_name = parts.next();
debug_assert!(parts.next().is_none());
if let Some(local_name) = maybe_local_name {
debug_assert!(!maybe_prefix.unwrap().is_empty());
(maybe_prefix, local_name)
} else {
(None, maybe_prefix.unwrap())
}
};
match (namespace, prefix) {
debug_assert!(!local_name.contains(colon));
match (namespace, maybe_prefix) {
(ns!(""), Some(_)) => {
// Step 6.
Err(Error::Namespace)