Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Hardcode accepting 0 as a valid str char boundary #32456

Merged
merged 2 commits into from
Mar 26, 2016
Merged

Hardcode accepting 0 as a valid str char boundary #32456

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
80e7a1b
Mark str::split_at inline
bluss Mar 23, 2016
f621193
Accept 0 as a valid str char boundary
bluss Mar 23, 2016
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
6 changes: 5 additions & 1 deletion src/libcore/str/mod.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1892,7 +1892,10 @@ impl StrExt for str {

#[inline]
fn is_char_boundary(&self, index: usize) -> bool {
if index == self.len() { return true; }
// 0 and len are always ok.
// Test for 0 explicitly so that it can optimize out the check
// easily and skip reading string data for that case.
if index == 0 || index == self.len() { return true; }
match self.as_bytes().get(index) {
None => false,
Some(&b) => b < 128 || b >= 192,
Expand Down Expand Up @@ -1965,6 +1968,7 @@ impl StrExt for str {
self.find(pat)
}

#[inline]
fn split_at(&self, mid: usize) -> (&str, &str) {
// is_char_boundary checks that the index is in [0, .len()]
if self.is_char_boundary(mid) {
Expand Down