textinput new len n codepoints messages

components/script/textinput.rs

@@ -159,6 +159,27 @@ fn len_of_first_n_chars(text: &str, n: usize) -> usize {
 /// The length in bytes of the first n code units a string when encoded in UTF-16.
 ///
 /// If the string is fewer than n code units, returns the length of the whole string.
+
+
+fn len_of_first_n_code_units_new(text: &str, n: usize) -> Option<usize> {//usize {
+    if n == 0 {
+        return Some(0);
+    }
+    let mut utf8_len = 0;
+    let mut utf16_len = 0;
+    for c in text.chars() {
+        utf16_len += c.len_utf16();
+        utf8_len += c.len_utf8();
+        if utf16_len == n {
+            break;
+        }
+        if utf16_len > n {
+            return None;
+        }
+    }
+    Some(utf8_len)
+}
+
 fn len_of_first_n_code_units(text: &str, n: usize) -> usize {
     let mut utf8_len = 0;
     let mut utf16_len = 0;
@@ -372,18 +393,27 @@ impl<T: ClipboardProvider> TextInput<T> {
         } else {
             usize::MAX
         };
-
+        println!("line: {}", &self.lines[start.line]);
+        println!("line bytes:");
+        for x in self.lines[start.line].bytes() {
+            println!("byte: {}", x);
+        }
+
+        let last_char_index_new = len_of_first_n_code_units_new(&*insert, allowed_to_insert_count).unwrap_or(999 as usize);
         let last_char_index = len_of_first_n_code_units(&*insert, allowed_to_insert_count);
+        println!("last_char_index_new: {} last_char_index: {}", last_char_index_new, last_char_index);
         let chars_to_insert = &insert[..last_char_index];
 
         self.clear_selection();
-
-        // Calculate byte start and end for handling multi-byte characters
-        let start_index_b = len_of_first_n_code_units(&self.lines[start.line], start.index);
-        let end_index_b = len_of_first_n_code_units(&self.lines[end.line], end.index);
+        let start_index_code_units_new = len_of_first_n_code_units_new(&self.lines[start.line], start.index).unwrap_or(999 as usize);
+        let end_index_code_units_new = len_of_first_n_code_units_new(&self.lines[end.line], end.index).unwrap_or(999 as usize);
+        let start_index_code_units = len_of_first_n_code_units(&self.lines[start.line], start.index);
+        let end_index_code_units = len_of_first_n_code_units(&self.lines[end.line], end.index);
+        println!("start.index: {} end.index: {} start_index_code_units: {} end_index_code_units: {} start_index_code_units_new: {} end_index_code_units_new: {}", start.index, end.index, start_index_code_units, end_index_code_units, start_index_code_units_new, end_index_code_units_new);
+        println!("old new start end index diff: {} {}", start.index == start_index_code_units_new, end.index == end_index_code_units_new);
         let new_lines = {
-            let prefix = &self.lines[start.line][..start_index_b];
-            let suffix = &self.lines[end.line][end_index_b..];
+            let prefix = &self.lines[start.line][..start.index];
+            let suffix = &self.lines[end.line][end.index..];
             let lines_prefix = &self.lines[..start.line];
             let lines_suffix = &self.lines[end.line + 1..];