Add test for word boundary movement/selection/deletion

zed/src/editor/buffer_view.rs

@@ -2357,6 +2357,188 @@ mod tests {
         });
     }
 
+    #[test]
+    fn test_prev_next_word_boundary() {
+        App::test((), |app| {
+            let buffer = app
+                .add_model(|ctx| Buffer::new(0, "use std::str::{foo, bar}\n\n  {baz.qux()}", ctx));
+            let settings = settings::channel(&app.font_cache()).unwrap().1;
+            let (_, view) = app.add_window(|ctx| BufferView::for_buffer(buffer, settings, ctx));
+            view.update(app, |view, ctx| {
+                view.select_display_ranges(
+                    &[
+                        DisplayPoint::new(0, 11)..DisplayPoint::new(0, 11),
+                        DisplayPoint::new(2, 4)..DisplayPoint::new(2, 4),
+                    ],
+                    ctx,
+                )
+                .unwrap();
+            });
+
+            view.update(app, |view, ctx| {
+                view.move_to_previous_word_boundary(&(), ctx)
+            });
+            assert_eq!(
+                view.read(app).selection_ranges(app.as_ref()),
+                &[
+                    DisplayPoint::new(0, 9)..DisplayPoint::new(0, 9),
+                    DisplayPoint::new(2, 3)..DisplayPoint::new(2, 3),
+                ]
+            );
+
+            view.update(app, |view, ctx| {
+                view.move_to_previous_word_boundary(&(), ctx)
+            });
+            assert_eq!(
+                view.read(app).selection_ranges(app.as_ref()),
+                &[
+                    DisplayPoint::new(0, 7)..DisplayPoint::new(0, 7),
+                    DisplayPoint::new(2, 2)..DisplayPoint::new(2, 2),
+                ]
+            );
+
+            view.update(app, |view, ctx| {
+                view.move_to_previous_word_boundary(&(), ctx)
+            });
+            assert_eq!(
+                view.read(app).selection_ranges(app.as_ref()),
+                &[
+                    DisplayPoint::new(0, 4)..DisplayPoint::new(0, 4),
+                    DisplayPoint::new(2, 0)..DisplayPoint::new(2, 0),
+                ]
+            );
+
+            view.update(app, |view, ctx| {
+                view.move_to_previous_word_boundary(&(), ctx)
+            });
+            assert_eq!(
+                view.read(app).selection_ranges(app.as_ref()),
+                &[
+                    DisplayPoint::new(0, 3)..DisplayPoint::new(0, 3),
+                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
+                ]
+            );
+
+            view.update(app, |view, ctx| {
+                view.move_to_previous_word_boundary(&(), ctx)
+            });
+            assert_eq!(
+                view.read(app).selection_ranges(app.as_ref()),
+                &[
+                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0),
+                    DisplayPoint::new(0, 24)..DisplayPoint::new(0, 24),
+                ]
+            );
+
+            view.update(app, |view, ctx| {
+                view.move_to_previous_word_boundary(&(), ctx)
+            });
+            assert_eq!(
+                view.read(app).selection_ranges(app.as_ref()),
+                &[
+                    DisplayPoint::new(0, 0)..DisplayPoint::new(0, 0),
+                    DisplayPoint::new(0, 23)..DisplayPoint::new(0, 23),
+                ]
+            );
+
+            view.update(app, |view, ctx| view.move_to_next_word_boundary(&(), ctx));
+            assert_eq!(
+                view.read(app).selection_ranges(app.as_ref()),
+                &[
+                    DisplayPoint::new(0, 3)..DisplayPoint::new(0, 3),
+                    DisplayPoint::new(0, 24)..DisplayPoint::new(0, 24),
+                ]
+            );
+
+            view.update(app, |view, ctx| view.move_to_next_word_boundary(&(), ctx));
+            assert_eq!(
+                view.read(app).selection_ranges(app.as_ref()),
+                &[
+                    DisplayPoint::new(0, 4)..DisplayPoint::new(0, 4),
+                    DisplayPoint::new(1, 0)..DisplayPoint::new(1, 0),
+                ]
+            );
+
+            view.update(app, |view, ctx| view.move_to_next_word_boundary(&(), ctx));
+            assert_eq!(
+                view.read(app).selection_ranges(app.as_ref()),
+                &[
+                    DisplayPoint::new(0, 7)..DisplayPoint::new(0, 7),
+                    DisplayPoint::new(2, 0)..DisplayPoint::new(2, 0),
+                ]
+            );
+
+            view.update(app, |view, ctx| view.move_to_next_word_boundary(&(), ctx));
+            assert_eq!(
+                view.read(app).selection_ranges(app.as_ref()),
+                &[
+                    DisplayPoint::new(0, 9)..DisplayPoint::new(0, 9),
+                    DisplayPoint::new(2, 2)..DisplayPoint::new(2, 2),
+                ]
+            );
+
+            view.update(app, |view, ctx| {
+                view.move_right(&(), ctx);
+                view.select_to_previous_word_boundary(&(), ctx);
+            });
+            assert_eq!(
+                view.read(app).selection_ranges(app.as_ref()),
+                &[
+                    DisplayPoint::new(0, 10)..DisplayPoint::new(0, 9),
+                    DisplayPoint::new(2, 3)..DisplayPoint::new(2, 2),
+                ]
+            );
+
+            view.update(app, |view, ctx| {
+                view.select_to_previous_word_boundary(&(), ctx)
+            });
+            assert_eq!(
+                view.read(app).selection_ranges(app.as_ref()),
+                &[
+                    DisplayPoint::new(0, 10)..DisplayPoint::new(0, 7),
+                    DisplayPoint::new(2, 3)..DisplayPoint::new(2, 0),
+                ]
+            );
+
+            view.update(app, |view, ctx| view.select_to_next_word_boundary(&(), ctx));
+            assert_eq!(
+                view.read(app).selection_ranges(app.as_ref()),
+                &[
+                    DisplayPoint::new(0, 10)..DisplayPoint::new(0, 9),
+                    DisplayPoint::new(2, 3)..DisplayPoint::new(2, 2),
+                ]
+            );
+
+            view.update(app, |view, ctx| view.delete_to_next_word_boundary(&(), ctx));
+            assert_eq!(
+                view.read(app).text(app.as_ref()),
+                "use std::s::{foo, bar}\n\n  {az.qux()}"
+            );
+            assert_eq!(
+                view.read(app).selection_ranges(app.as_ref()),
+                &[
+                    DisplayPoint::new(0, 10)..DisplayPoint::new(0, 10),
+                    DisplayPoint::new(2, 3)..DisplayPoint::new(2, 3),
+                ]
+            );
+
+            view.update(app, |view, ctx| {
+                view.delete_to_previous_word_boundary(&(), ctx)
+            });
+            assert_eq!(
+                view.read(app).text(app.as_ref()),
+                "use std::::{foo, bar}\n\n  az.qux()}"
+            );
+            assert_eq!(
+                view.read(app).selection_ranges(app.as_ref()),
+                &[
+                    DisplayPoint::new(0, 9)..DisplayPoint::new(0, 9),
+                    DisplayPoint::new(2, 2)..DisplayPoint::new(2, 2),
+                ]
+            );
+        });
+    }
+
     #[test]
     fn test_backspace() {
         App::test((), |app| {

zed/src/editor/movement.rs

@@ -119,7 +119,7 @@ pub fn next_word_boundary(
 ) -> Result<DisplayPoint> {
     let mut prev_c = None;
     for c in map.chars_at(point, app)? {
-        if prev_c.is_some() && char_kind(prev_c.unwrap()) != char_kind(c) {
+        if prev_c.is_some() && (c == '\n' || char_kind(prev_c.unwrap()) != char_kind(c)) {
             break;
         }
 
@@ -136,13 +136,16 @@ pub fn next_word_boundary(
 
 #[derive(Copy, Clone, Eq, PartialEq)]
 enum CharKind {
+    Newline,
     Whitespace,
     Punctuation,
     Word,
 }
 
 fn char_kind(c: char) -> CharKind {
-    if c.is_whitespace() {
+    if c == '\n' {
+        CharKind::Newline
+    } else if c.is_whitespace() {
         CharKind::Whitespace
     } else if c.is_alphanumeric() || c == '_' {
         CharKind::Word