slice_unchecked

Author: kdy1

crates/swc_ecma_fast_parser/src/lexer/cursor.rs

@@ -149,18 +149,6 @@ impl<'a> Cursor<'a> {
         unsafe { self.input.get_unchecked(self.pos as usize..) }
     }
 
-    /// Get a slice of the input
-    #[inline(always)]
-    pub fn slice(&self, start: u32, end: u32) -> &'a [u8] {
-        let real_start = start.min(self.len);
-        let real_end = end.min(self.len);
-        // SAFETY: We've validated bounds
-        unsafe {
-            self.input
-                .get_unchecked(real_start as usize..real_end as usize)
-        }
-    }
-
     /// Get a slice of the input without bounds checking.
     ///
     /// # Safety

crates/swc_ecma_fast_parser/src/lexer/jsx.rs

@@ -125,7 +125,7 @@ impl Lexer<'_> {
                     let end = self.cursor.position();
 
                     if end > start {
-                        let slice = self.cursor.slice(start, end);
+                        let slice = unsafe { self.cursor.slice_unchecked(start, end) };
                         text.push_str(unsafe { std::str::from_utf8_unchecked(slice) });
                     }
                 }
@@ -149,7 +149,7 @@ impl Lexer<'_> {
 
         // Extract the raw text
         let end_idx = self.cursor.position();
-        let raw_bytes = self.cursor.slice(start_idx, end_idx);
+        let raw_bytes = unsafe { self.cursor.slice_unchecked(start_idx, end_idx) };
         let raw_str = unsafe { std::str::from_utf8_unchecked(raw_bytes) };
 
         let span = self.span();

crates/swc_ecma_fast_parser/src/lexer/operators.rs

@@ -624,7 +624,7 @@ impl Lexer<'_> {
             }
             let end = self.cursor.position();
             let shebang_str =
-                unsafe { std::str::from_utf8_unchecked(self.cursor.slice(start, end)) };
+                unsafe { std::str::from_utf8_unchecked(self.cursor.slice_unchecked(start, end)) };
 
             return Ok(Token::new(
                 TokenType::Shebang,

crates/swc_ecma_fast_parser/src/lexer/template.rs

@@ -238,7 +238,7 @@ impl Lexer<'_> {
                         // Add all these characters at once
                         let end = self.cursor.position();
                         if end > start {
-                            let slice = self.cursor.slice(start, end);
+                            let slice = unsafe { self.cursor.slice_unchecked(start, end) };
                             value.push_str(unsafe { std::str::from_utf8_unchecked(slice) });
                         }
                     } else {
@@ -252,7 +252,7 @@ impl Lexer<'_> {
 
         // Extract the raw template (including backticks)
         let end_idx = self.cursor.position();
-        let raw_bytes = self.cursor.slice(start_idx, end_idx);
+        let raw_bytes = unsafe { self.cursor.slice_unchecked(start_idx, end_idx) };
         let raw_str = unsafe { std::str::from_utf8_unchecked(raw_bytes) };
 
         let span = self.span();