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Speed up get_case_fold() 5x

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Using `c.is_uppercase()` instead of getting the iterator and checking if the
first (and only) lowercase letter of the sequence is the same as the original
input is 5-8x faster (measured via criterion against `/usr/share/dict/words`).

(Additional benefit of forcibly inlining the now iterator-based comparison not
taken into account; this necessitated changing from a closure to a local
function as the inline attribute on closures is not yet supported with the
stable compiler toolchain.)
This commit is contained in:
Mahmoud Al-Qudsi 2024-11-22 15:33:13 -06:00
parent b949497bc1
commit 8c8da78cf8
1 changed files with 19 additions and 10 deletions
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29
src/wcstringutil.rs
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@ -175,14 +175,14 @@ impl StringFuzzyMatch {
) -> Option<StringFuzzyMatch> {
// Helper to lazily compute if case insensitive matches should use icase or smartcase.
// Use icase if the input contains any uppercase characters, smartcase otherwise.
let get_case_fold = || {
for c in string.chars() {
if c.to_lowercase().next().unwrap() != c {
return CaseSensitivity::Insensitive;
}
#[inline(always)]
fn get_case_fold(s: &widestring::Utf32Str) -> CaseSensitivity {
if s.chars().any(|c| c.is_uppercase()) {
CaseSensitivity::Insensitive
} else {
CaseSensitivity::Smart
}
CaseSensitivity::Smart
};
}
// A string cannot fuzzy match against a shorter string.
if string.len() > match_against.len() {
@ -207,12 +207,18 @@ impl StringFuzzyMatch {
// exact icase
if wcscasecmp(string, match_against).is_eq() {
return Some(StringFuzzyMatch::new(ContainType::Exact, get_case_fold()));
return Some(StringFuzzyMatch::new(
ContainType::Exact,
get_case_fold(string),
));
}
// prefix icase
if string_prefixes_string_case_insensitive(string, match_against) {
return Some(StringFuzzyMatch::new(ContainType::Prefix, get_case_fold()));
return Some(StringFuzzyMatch::new(
ContainType::Prefix,
get_case_fold(string),
));
}
// If anchor_start is set, this is as far as we go.
@ -234,7 +240,10 @@ impl StringFuzzyMatch {
// substr icase
if ifind(match_against, string, true /* fuzzy */).is_some() {
return Some(StringFuzzyMatch::new(ContainType::Substr, get_case_fold()));
return Some(StringFuzzyMatch::new(
ContainType::Substr,
get_case_fold(string),
));
}
// subseq samecase