rust: syn: remove unicode-ident dependency

ojeda · ojeda · commit 82e9a4f0bd26 · 2024-04-10T10:44:38.000+02:00
The `syn` crate depends on the `unicode-ident` crate to determine whether characters have the XID_Start or XID_Continue properties according to Unicode Standard Annex Rust-for-Linux#31. However, we only need ASCII identifiers in the kernel, thus we can simplify the check and remove completely that dependency. Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
diff --git a/rust/syn/ident.rs b/rust/syn/ident.rs
@@ -39,11 +39,11 @@ impl From<Token![_]> for Ident {
 pub(crate) fn xid_ok(symbol: &str) -> bool {
     let mut chars = symbol.chars();
     let first = chars.next().unwrap();
-    if !(first == '_' || unicode_ident::is_xid_start(first)) {
+    if !(first == '_' || first.is_ascii_alphabetic()) {
         return false;
     }
     for ch in chars {
-        if !unicode_ident::is_xid_continue(ch) {
+        if !(ch == '_' || ch.is_ascii_alphanumeric()) {
             return false;
         }
     }

Original file line number	Diff line number	Diff line change
`@@ -39,11 +39,11 @@ impl From<Token![_]> for Ident {`
`39`	`39`	`pub(crate) fn xid_ok(symbol: &str) -> bool {`
`40`	`40`	`let mut chars = symbol.chars();`
`41`	`41`	`let first = chars.next().unwrap();`
`42`		`- if !(first == '_' \|\| unicode_ident::is_xid_start(first)) {`
	`42`	`+ if !(first == '_' \|\| first.is_ascii_alphabetic()) {`
`43`	`43`	`return false;`
`44`	`44`	`}`
`45`	`45`	`for ch in chars {`
`46`		`- if !unicode_ident::is_xid_continue(ch) {`
	`46`	`+ if !(ch == '_' \|\| ch.is_ascii_alphanumeric()) {`
`47`	`47`	`return false;`
`48`	`48`	`}`
`49`	`49`	`}`