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Rollup merge of #81735 - klensy:span-fix, r=varkor

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faster few span methods

Touched few methods, so it should be (hopefully) faster.

First two changes: instead splitting string from start and taking only last piece, split it from the end.
Last: swapped conditions, to first check boolean parameter.
This commit is contained in:
Mara Bos 2021-02-08 19:28:15 +01:00 committed by GitHub
commit 2c8d1c8cef
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2 changed files with 10 additions and 8 deletions
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1
compiler/rustc_span/src/lib.rs
View File

@ -22,6 +22,7 @@
#![feature(nll)]
#![feature(min_specialization)]
#![feature(option_expect_none)]
#![feature(str_split_once)]
#[macro_use]
extern crate rustc_macros;

17
compiler/rustc_span/src/source_map.rs
View File

@ -539,7 +539,7 @@ impl SourceMap {
pub fn is_line_before_span_empty(&self, sp: Span) -> bool {
match self.span_to_prev_source(sp) {
Ok(s) => s.split('\n').last().map_or(false, |l| l.trim_start().is_empty()),
Ok(s) => s.rsplit_once('\n').unwrap_or(("", &s)).1.trim_start().is_empty(),
Err(_) => false,
}
}
@ -632,10 +632,11 @@ impl SourceMap {
pub fn span_to_margin(&self, sp: Span) -> Option<usize> {
match self.span_to_prev_source(sp) {
Err(_) => None,
Ok(source) => source
.split('\n')
.last()
.map(|last_line| last_line.len() - last_line.trim_start().len()),
Ok(source) => {
let last_line = source.rsplit_once('\n').unwrap_or(("", &source)).1;
Some(last_line.len() - last_line.trim_start().len())
}
}
}
@ -651,7 +652,7 @@ impl SourceMap {
pub fn span_extend_to_prev_char(&self, sp: Span, c: char, accept_newlines: bool) -> Span {
if let Ok(prev_source) = self.span_to_prev_source(sp) {
let prev_source = prev_source.rsplit(c).next().unwrap_or("");
if !prev_source.is_empty() && (!prev_source.contains('\n') || accept_newlines) {
if !prev_source.is_empty() && (accept_newlines || !prev_source.contains('\n')) {
return sp.with_lo(BytePos(sp.lo().0 - prev_source.len() as u32));
}
}
@ -673,7 +674,7 @@ impl SourceMap {
let prev_source = prev_source.rsplit(&pat).next().unwrap_or("").trim_start();
if prev_source.is_empty() && sp.lo().0 != 0 {
return sp.with_lo(BytePos(sp.lo().0 - 1));
} else if !prev_source.contains('\n') || accept_newlines {
} else if accept_newlines || !prev_source.contains('\n') {
return sp.with_lo(BytePos(sp.lo().0 - prev_source.len() as u32));
}
}
@ -693,7 +694,7 @@ impl SourceMap {
pub fn span_extend_to_next_char(&self, sp: Span, c: char, accept_newlines: bool) -> Span {
if let Ok(next_source) = self.span_to_next_source(sp) {
let next_source = next_source.split(c).next().unwrap_or("");
if !next_source.is_empty() && (!next_source.contains('\n') || accept_newlines) {
if !next_source.is_empty() && (accept_newlines || !next_source.contains('\n')) {
return sp.with_hi(BytePos(sp.hi().0 + next_source.len() as u32));
}
}