refactor: query code points in a specific keyboard zone

Author: aradzie

packages/keybr-keyboard/lib/keyboard.test.ts

@@ -60,6 +60,28 @@ test("data", (t) => {
     [...keyboard.getCodePoints({ dead: false, shift: false, alt: false })],
     [/* a */ 0x0061],
   );
+  t.deepEqual(
+    [
+      ...keyboard.getCodePoints({
+        dead: false,
+        shift: false,
+        alt: false,
+        zone: "left",
+      }),
+    ],
+    [/* a */ 0x0061],
+  );
+  t.deepEqual(
+    [
+      ...keyboard.getCodePoints({
+        dead: false,
+        shift: false,
+        alt: false,
+        zone: "right",
+      }),
+    ],
+    [],
+  );
 
   t.is(keyboard.getCharacters("unknown"), null);
   t.deepEqual(keyboard.getCharacters("KeyA"), key1);

packages/keybr-keyboard/lib/keyboard.ts

@@ -82,30 +82,31 @@ export class Keyboard {
     dead = true,
     shift = true,
     alt = true,
+    zone = null,
   }: {
     readonly dead?: boolean;
     readonly shift?: boolean;
     readonly alt?: boolean;
+    readonly zone?: ZoneId | null;
   } = {}): WeightedCodePointSet {
     const list: CodePoint[] = [];
     const weights = new Map<CodePoint, number>();
     for (const combo of this.combos.values()) {
+      const shape = this.getShape(combo.id);
       if (
         (combo.prefix == null || dead) &&
         (!combo.shift || shift) &&
-        (!combo.alt || alt)
+        (!combo.alt || alt) &&
+        (zone == null || shape?.inZone(zone))
       ) {
         list.push(combo.codePoint);
-        const shape = this.shapes.get(combo.id);
-        if (shape != null) {
-          switch (shape.row) {
-            case "home":
-              weights.set(combo.codePoint, 1);
-              break;
-            case "top":
-              weights.set(combo.codePoint, 2);
-              break;
-          }
+        switch (shape?.row) {
+          case "home":
+            weights.set(combo.codePoint, 1);
+            break;
+          case "top":
+            weights.set(combo.codePoint, 2);
+            break;
         }
       }
     }