bjoernager/rust
bjoernager/rust
1
Fork 0
Code Issues Pull requests Activity

fmt::Formatter::pad: don't call chars().count() more than one time

Browse source
This commit is contained in:
klensy 2021-09-01 15:35:58 +03:00
parent 608b5e1c20
commit 6c9e708f4b
1 changed files with 14 additions and 9 deletions
Download patch file Download diff file Expand all files Collapse all files

11
library/core/src/fmt/mod.rs
View file

@ -1421,19 +1421,24 @@ impl<'a> Formatter<'a> {
// If we're under the maximum length, and there's no minimum length
// requirements, then we can just emit the string
None => self.buf.write_str(s),
Some(width) => {
let chars_count = s.chars().count();
// If we're under the maximum width, check if we're over the minimum
// width, if so it's as easy as just emitting the string.
Some(width) if s.chars().count() >= width => self.buf.write_str(s),
if chars_count >= width {
self.buf.write_str(s)
}
// If we're under both the maximum and the minimum width, then fill
// up the minimum width with the specified string + some alignment.
Some(width) => {
else {
let align = rt::v1::Alignment::Left;
let post_padding = self.padding(width - s.chars().count(), align)?;
let post_padding = self.padding(width - chars_count, align)?;
self.buf.write_str(s)?;
post_padding.write(self.buf)
}
}
}
}
/// Write the pre-padding and return the unwritten post-padding. Callers are
/// responsible for ensuring post-padding is written after the thing that is