Merge pull request #35 from zed-industries/move-to-prev-next-word-boundary

Implement word boundary movement/selection/deletion

zed/src/editor/buffer_view.rs

@@ -35,6 +35,16 @@ pub fn init(app: &mut MutableAppContext) {
         Binding::new("ctrl-d", "buffer:delete", Some("BufferView")),
         Binding::new("enter", "buffer:newline", Some("BufferView")),
         Binding::new("ctrl-shift-K", "buffer:delete_line", Some("BufferView")),
+        Binding::new(
+            "alt-backspace",
+            "buffer:delete_to_previous_word_boundary",
+            Some("BufferView"),
+        ),
+        Binding::new(
+            "alt-delete",
+            "buffer:delete_to_next_word_boundary",
+            Some("BufferView"),
+        ),
         Binding::new(
             "cmd-backspace",
             "buffer:delete_to_beginning_of_line",
@@ -55,6 +65,16 @@ pub fn init(app: &mut MutableAppContext) {
         Binding::new("down", "buffer:move_down", Some("BufferView")),
         Binding::new("left", "buffer:move_left", Some("BufferView")),
         Binding::new("right", "buffer:move_right", Some("BufferView")),
+        Binding::new(
+            "alt-left",
+            "buffer:move_to_previous_word_boundary",
+            Some("BufferView"),
+        ),
+        Binding::new(
+            "alt-right",
+            "buffer:move_to_next_word_boundary",
+            Some("BufferView"),
+        ),
         Binding::new(
             "cmd-left",
             "buffer:move_to_beginning_of_line",
@@ -77,6 +97,16 @@ pub fn init(app: &mut MutableAppContext) {
         Binding::new("shift-down", "buffer:select_down", Some("BufferView")),
         Binding::new("shift-left", "buffer:select_left", Some("BufferView")),
         Binding::new("shift-right", "buffer:select_right", Some("BufferView")),
+        Binding::new(
+            "alt-shift-left",
+            "buffer:select_to_previous_word_boundary",
+            Some("BufferView"),
+        ),
+        Binding::new(
+            "alt-shift-right",
+            "buffer:select_to_next_word_boundary",
+            Some("BufferView"),
+        ),
         Binding::new(
             "cmd-shift-left",
             "buffer:select_to_beginning_of_line",
@@ -124,6 +154,14 @@ pub fn init(app: &mut MutableAppContext) {
     app.add_action("buffer:backspace", BufferView::backspace);
     app.add_action("buffer:delete", BufferView::delete);
     app.add_action("buffer:delete_line", BufferView::delete_line);
+    app.add_action(
+        "buffer:delete_to_previous_word_boundary",
+        BufferView::delete_to_previous_word_boundary,
+    );
+    app.add_action(
+        "buffer:delete_to_next_word_boundary",
+        BufferView::delete_to_next_word_boundary,
+    );
     app.add_action(
         "buffer:delete_to_beginning_of_line",
         BufferView::delete_to_beginning_of_line,
@@ -142,6 +180,14 @@ pub fn init(app: &mut MutableAppContext) {
     app.add_action("buffer:move_down", BufferView::move_down);
     app.add_action("buffer:move_left", BufferView::move_left);
     app.add_action("buffer:move_right", BufferView::move_right);
+    app.add_action(
+        "buffer:move_to_previous_word_boundary",
+        BufferView::move_to_previous_word_boundary,
+    );
+    app.add_action(
+        "buffer:move_to_next_word_boundary",
+        BufferView::move_to_next_word_boundary,
+    );
     app.add_action(
         "buffer:move_to_beginning_of_line",
         BufferView::move_to_beginning_of_line,
@@ -156,6 +202,14 @@ pub fn init(app: &mut MutableAppContext) {
     app.add_action("buffer:select_down", BufferView::select_down);
     app.add_action("buffer:select_left", BufferView::select_left);
     app.add_action("buffer:select_right", BufferView::select_right);
+    app.add_action(
+        "buffer:select_to_previous_word_boundary",
+        BufferView::select_to_previous_word_boundary,
+    );
+    app.add_action(
+        "buffer:select_to_next_word_boundary",
+        BufferView::select_to_next_word_boundary,
+    );
     app.add_action(
         "buffer:select_to_beginning_of_line",
         BufferView::select_to_beginning_of_line,
@@ -1086,6 +1140,90 @@ impl BufferView {
         self.update_selections(selections, true, ctx);
     }
 
+    pub fn move_to_previous_word_boundary(&mut self, _: &(), ctx: &mut ViewContext<Self>) {
+        let app = ctx.as_ref();
+        let mut selections = self.selections(app).to_vec();
+        {
+            let map = self.display_map.read(app);
+            for selection in &mut selections {
+                let head = selection.head().to_display_point(map, app).unwrap();
+                let new_head = movement::prev_word_boundary(map, head, app).unwrap();
+                let anchor = map.anchor_before(new_head, Bias::Left, app).unwrap();
+                selection.start = anchor.clone();
+                selection.end = anchor;
+                selection.reversed = false;
+                selection.goal_column = None;
+            }
+        }
+        self.update_selections(selections, true, ctx);
+    }
+
+    pub fn select_to_previous_word_boundary(&mut self, _: &(), ctx: &mut ViewContext<Self>) {
+        let app = ctx.as_ref();
+        let mut selections = self.selections(app).to_vec();
+        {
+            let buffer = self.buffer.read(ctx);
+            let map = self.display_map.read(app);
+            for selection in &mut selections {
+                let head = selection.head().to_display_point(map, app).unwrap();
+                let new_head = movement::prev_word_boundary(map, head, app).unwrap();
+                let anchor = map.anchor_before(new_head, Bias::Left, app).unwrap();
+                selection.set_head(buffer, anchor);
+                selection.goal_column = None;
+            }
+        }
+        self.update_selections(selections, true, ctx);
+    }
+
+    pub fn delete_to_previous_word_boundary(&mut self, _: &(), ctx: &mut ViewContext<Self>) {
+        self.start_transaction(ctx);
+        self.select_to_previous_word_boundary(&(), ctx);
+        self.backspace(&(), ctx);
+        self.end_transaction(ctx);
+    }
+
+    pub fn move_to_next_word_boundary(&mut self, _: &(), ctx: &mut ViewContext<Self>) {
+        let app = ctx.as_ref();
+        let mut selections = self.selections(app).to_vec();
+        {
+            let map = self.display_map.read(app);
+            for selection in &mut selections {
+                let head = selection.head().to_display_point(map, app).unwrap();
+                let new_head = movement::next_word_boundary(map, head, app).unwrap();
+                let anchor = map.anchor_before(new_head, Bias::Left, app).unwrap();
+                selection.start = anchor.clone();
+                selection.end = anchor;
+                selection.reversed = false;
+                selection.goal_column = None;
+            }
+        }
+        self.update_selections(selections, true, ctx);
+    }
+
+    pub fn select_to_next_word_boundary(&mut self, _: &(), ctx: &mut ViewContext<Self>) {
+        let app = ctx.as_ref();
+        let mut selections = self.selections(app).to_vec();
+        {
+            let buffer = self.buffer.read(ctx);
+            let map = self.display_map.read(app);
+            for selection in &mut selections {
+                let head = selection.head().to_display_point(map, app).unwrap();
+                let new_head = movement::next_word_boundary(map, head, app).unwrap();
+                let anchor = map.anchor_before(new_head, Bias::Left, app).unwrap();
+                selection.set_head(buffer, anchor);
+                selection.goal_column = None;
+            }
+        }
+        self.update_selections(selections, true, ctx);
+    }
+
+    pub fn delete_to_next_word_boundary(&mut self, _: &(), ctx: &mut ViewContext<Self>) {
+        self.start_transaction(ctx);
+        self.select_to_next_word_boundary(&(), ctx);
+        self.delete(&(), ctx);
+        self.end_transaction(ctx);
+    }
+
     pub fn move_to_beginning_of_line(&mut self, _: &(), ctx: &mut ViewContext<Self>) {
         let app = ctx.as_ref();
         let mut selections = self.selections(app).to_vec();
@@ -2220,6 +2358,188 @@ 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

@@ -79,3 +79,77 @@ pub fn line_end(map: &DisplayMap, point: DisplayPoint, app: &AppContext) -> Resu
         map.line_len(point.row(), app)?,
     ))
 }
+
+pub fn prev_word_boundary(
+    map: &DisplayMap,
+    point: DisplayPoint,
+    app: &AppContext,
+) -> Result<DisplayPoint> {
+    if point.column() == 0 {
+        if point.row() == 0 {
+            Ok(DisplayPoint::new(0, 0))
+        } else {
+            let row = point.row() - 1;
+            Ok(DisplayPoint::new(row, map.line_len(row, app)?))
+        }
+    } else {
+        let mut boundary = DisplayPoint::new(point.row(), 0);
+        let mut column = 0;
+        let mut prev_c = None;
+        for c in map.chars_at(boundary, app)? {
+            if column >= point.column() {
+                break;
+            }
+
+            if prev_c.is_none() || char_kind(prev_c.unwrap()) != char_kind(c) {
+                *boundary.column_mut() = column;
+            }
+
+            prev_c = Some(c);
+            column += 1;
+        }
+        Ok(boundary)
+    }
+}
+
+pub fn next_word_boundary(
+    map: &DisplayMap,
+    mut point: DisplayPoint,
+    app: &AppContext,
+) -> Result<DisplayPoint> {
+    let mut prev_c = None;
+    for c in map.chars_at(point, app)? {
+        if prev_c.is_some() && (c == '\n' || char_kind(prev_c.unwrap()) != char_kind(c)) {
+            break;
+        }
+
+        if c == '\n' {
+            *point.row_mut() += 1;
+            *point.column_mut() = 0;
+        } else {
+            *point.column_mut() += 1;
+        }
+        prev_c = Some(c);
+    }
+    Ok(point)
+}
+
+#[derive(Copy, Clone, Eq, PartialEq)]
+enum CharKind {
+    Newline,
+    Whitespace,
+    Punctuation,
+    Word,
+}
+
+fn char_kind(c: char) -> CharKind {
+    if c == '\n' {
+        CharKind::Newline
+    } else if c.is_whitespace() {
+        CharKind::Whitespace
+    } else if c.is_alphanumeric() || c == '_' {
+        CharKind::Word
+    } else {
+        CharKind::Punctuation
+    }
+}