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authorIgor Aleksanov <[email protected]>2020-10-03 14:45:16 +0100
committerIgor Aleksanov <[email protected]>2020-10-12 08:59:54 +0100
commit17f1026c46e6e3797caf3c69737f66bd612c58e1 (patch)
treea465868cec992815df9f7fd8d06bed8df4daf746 /crates
parent21dd704b6b28374ea7bd2d1e13469be6807c4a8d (diff)
Improve string helpers functions
Diffstat (limited to 'crates')
-rw-r--r--crates/hir_ty/src/diagnostics/decl_check/str_helpers.rs9
-rw-r--r--crates/stdx/src/lib.rs6
2 files changed, 13 insertions, 2 deletions
diff --git a/crates/hir_ty/src/diagnostics/decl_check/str_helpers.rs b/crates/hir_ty/src/diagnostics/decl_check/str_helpers.rs
index 3d8f1b5f2..953d0276f 100644
--- a/crates/hir_ty/src/diagnostics/decl_check/str_helpers.rs
+++ b/crates/hir_ty/src/diagnostics/decl_check/str_helpers.rs
@@ -61,7 +61,9 @@ fn is_upper_snake_case(ident: &str) -> bool {
61 61
62fn is_camel_case(ident: &str) -> bool { 62fn is_camel_case(ident: &str) -> bool {
63 // We assume that the string is either snake case or camel case. 63 // We assume that the string is either snake case or camel case.
64 ident.chars().all(|c| c != '_') 64 // `_` is allowed only at the beginning or in the end of identifier, not between characters.
65 ident.trim_matches('_').chars().all(|c| c != '_')
66 && ident.chars().find(|c| c.is_alphabetic()).map(|c| c.is_ascii_uppercase()).unwrap_or(true)
65} 67}
66 68
67#[cfg(test)] 69#[cfg(test)]
@@ -80,13 +82,18 @@ mod tests {
80 fn test_to_lower_snake_case() { 82 fn test_to_lower_snake_case() {
81 check(to_lower_snake_case, "lower_snake_case", expect![[""]]); 83 check(to_lower_snake_case, "lower_snake_case", expect![[""]]);
82 check(to_lower_snake_case, "UPPER_SNAKE_CASE", expect![["upper_snake_case"]]); 84 check(to_lower_snake_case, "UPPER_SNAKE_CASE", expect![["upper_snake_case"]]);
85 check(to_lower_snake_case, "Weird_Case", expect![["weird_case"]]);
83 check(to_lower_snake_case, "CamelCase", expect![["camel_case"]]); 86 check(to_lower_snake_case, "CamelCase", expect![["camel_case"]]);
84 } 87 }
85 88
86 #[test] 89 #[test]
87 fn test_to_camel_case() { 90 fn test_to_camel_case() {
88 check(to_camel_case, "CamelCase", expect![[""]]); 91 check(to_camel_case, "CamelCase", expect![[""]]);
92 check(to_camel_case, "CamelCase_", expect![[""]]);
93 check(to_camel_case, "_CamelCase", expect![[""]]);
89 check(to_camel_case, "lower_snake_case", expect![["LowerSnakeCase"]]); 94 check(to_camel_case, "lower_snake_case", expect![["LowerSnakeCase"]]);
90 check(to_camel_case, "UPPER_SNAKE_CASE", expect![["UpperSnakeCase"]]); 95 check(to_camel_case, "UPPER_SNAKE_CASE", expect![["UpperSnakeCase"]]);
96 check(to_camel_case, "Weird_Case", expect![["WeirdCase"]]);
97 check(to_camel_case, "name", expect![["Name"]]);
91 } 98 }
92} 99}
diff --git a/crates/stdx/src/lib.rs b/crates/stdx/src/lib.rs
index 011935cad..522a9c1ab 100644
--- a/crates/stdx/src/lib.rs
+++ b/crates/stdx/src/lib.rs
@@ -32,8 +32,12 @@ pub fn to_lower_snake_case(s: &str) -> String {
32 let mut buf = String::with_capacity(s.len()); 32 let mut buf = String::with_capacity(s.len());
33 let mut prev = false; 33 let mut prev = false;
34 for c in s.chars() { 34 for c in s.chars() {
35 // `&& prev` is required to not insert `_` before the first symbol.
35 if c.is_ascii_uppercase() && prev { 36 if c.is_ascii_uppercase() && prev {
36 buf.push('_') 37 // This check is required to not translate `Weird_Case` into `weird__case`.
38 if buf.chars().last() != Some('_') {
39 buf.push('_')
40 }
37 } 41 }
38 prev = true; 42 prev = true;
39 43