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authorLukas Wirth <[email protected]>2021-02-05 14:02:39 +0000
committerLukas Wirth <[email protected]>2021-02-05 14:02:39 +0000
commit486c7175fe784194e4523c53ca12d5528f6f9134 (patch)
treea91911ae9662ed705d98af5d45cbf12e1ff76863 /crates/hir_ty
parentac5958485e5e77b020b3ebe0c100df5a5fe6ca08 (diff)
Remove unnecessary allocs in case_conv
Diffstat (limited to 'crates/hir_ty')
-rw-r--r--crates/hir_ty/src/diagnostics/decl_check/case_conv.rs34
1 files changed, 16 insertions, 18 deletions
diff --git a/crates/hir_ty/src/diagnostics/decl_check/case_conv.rs b/crates/hir_ty/src/diagnostics/decl_check/case_conv.rs
index 14e4d92f0..3ab36caf2 100644
--- a/crates/hir_ty/src/diagnostics/decl_check/case_conv.rs
+++ b/crates/hir_ty/src/diagnostics/decl_check/case_conv.rs
@@ -5,7 +5,7 @@
5// from file /compiler/rustc_lint/src/nonstandard_style.rs 5// from file /compiler/rustc_lint/src/nonstandard_style.rs
6 6
7/// Converts an identifier to an UpperCamelCase form. 7/// Converts an identifier to an UpperCamelCase form.
8/// Returns `None` if the string is already is UpperCamelCase. 8/// Returns `None` if the string is already in UpperCamelCase.
9pub(crate) fn to_camel_case(ident: &str) -> Option<String> { 9pub(crate) fn to_camel_case(ident: &str) -> Option<String> {
10 if is_camel_case(ident) { 10 if is_camel_case(ident) {
11 return None; 11 return None;
@@ -17,7 +17,7 @@ pub(crate) fn to_camel_case(ident: &str) -> Option<String> {
17 .split('_') 17 .split('_')
18 .filter(|component| !component.is_empty()) 18 .filter(|component| !component.is_empty())
19 .map(|component| { 19 .map(|component| {
20 let mut camel_cased_component = String::new(); 20 let mut camel_cased_component = String::with_capacity(component.len());
21 21
22 let mut new_word = true; 22 let mut new_word = true;
23 let mut prev_is_lower_case = true; 23 let mut prev_is_lower_case = true;
@@ -30,9 +30,9 @@ pub(crate) fn to_camel_case(ident: &str) -> Option<String> {
30 } 30 }
31 31
32 if new_word { 32 if new_word {
33 camel_cased_component.push_str(&c.to_uppercase().to_string()); 33 camel_cased_component.extend(c.to_uppercase());
34 } else { 34 } else {
35 camel_cased_component.push_str(&c.to_lowercase().to_string()); 35 camel_cased_component.extend(c.to_lowercase());
36 } 36 }
37 37
38 prev_is_lower_case = c.is_lowercase(); 38 prev_is_lower_case = c.is_lowercase();
@@ -41,16 +41,16 @@ pub(crate) fn to_camel_case(ident: &str) -> Option<String> {
41 41
42 camel_cased_component 42 camel_cased_component
43 }) 43 })
44 .fold((String::new(), None), |(acc, prev): (String, Option<String>), next| { 44 .fold((String::new(), None), |(acc, prev): (_, Option<String>), next| {
45 // separate two components with an underscore if their boundary cannot 45 // separate two components with an underscore if their boundary cannot
46 // be distinguished using a uppercase/lowercase case distinction 46 // be distinguished using a uppercase/lowercase case distinction
47 let join = if let Some(prev) = prev { 47 let join = prev
48 let l = prev.chars().last().unwrap(); 48 .and_then(|prev| {
49 let f = next.chars().next().unwrap(); 49 let f = next.chars().next()?;
50 !char_has_case(l) && !char_has_case(f) 50 let l = prev.chars().last()?;
51 } else { 51 Some(!char_has_case(l) && !char_has_case(f))
52 false 52 })
53 }; 53 .unwrap_or(false);
54 (acc + if join { "_" } else { "" } + &next, Some(next)) 54 (acc + if join { "_" } else { "" } + &next, Some(next))
55 }) 55 })
56 .0; 56 .0;
@@ -92,14 +92,12 @@ fn is_camel_case(name: &str) -> bool {
92 let mut fst = None; 92 let mut fst = None;
93 // start with a non-lowercase letter rather than non-uppercase 93 // start with a non-lowercase letter rather than non-uppercase
94 // ones (some scripts don't have a concept of upper/lowercase) 94 // ones (some scripts don't have a concept of upper/lowercase)
95 !name.chars().next().unwrap().is_lowercase() 95 name.chars().next().map_or(true, |c| !c.is_lowercase())
96 && !name.contains("__") 96 && !name.contains("__")
97 && !name.chars().any(|snd| { 97 && !name.chars().any(|snd| {
98 let ret = match (fst, snd) { 98 let ret = match fst {
99 (None, _) => false, 99 None => false,
100 (Some(fst), snd) => { 100 Some(fst) => char_has_case(fst) && snd == '_' || char_has_case(snd) && fst == '_',
101 char_has_case(fst) && snd == '_' || char_has_case(snd) && fst == '_'
102 }
103 }; 101 };
104 fst = Some(snd); 102 fst = Some(snd);
105 103