Fix ordinal stages

Author: pokey

packages/cursorless-engine/src/processTargets/ModifierStageFactoryImpl.ts

@@ -82,6 +82,10 @@ export class ModifierStageFactoryImpl implements ModifierStageFactory {
 
         return new EveryScopeStage(this, this.scopeHandlerFactory, modifier);
       case "ordinalScope":
+        if (modifier.scopeType.type === "instance") {
+          return new InstanceStage(this, modifier);
+        }
+
         return new OrdinalScopeStage(this, modifier);
       case "relativeScope":
         if (modifier.scopeType.type === "instance") {

packages/cursorless-engine/src/processTargets/modifiers/InstanceStage.ts

@@ -1,6 +1,7 @@
 import {
   Direction,
   Modifier,
+  OrdinalScopeModifier,
   Range,
   RelativeScopeModifier,
   ScopeType,
@@ -13,8 +14,8 @@ import { generateMatchesInRange } from "../../util/getMatchesInRange";
 import { ModifierStageFactory } from "../ModifierStageFactory";
 import type { ModifierStage } from "../PipelineStages.types";
 import { PlainTarget } from "../targets";
-import { OutOfRangeError } from "./targetSequenceUtils";
 import { ContainingTokenIfUntypedEmptyStage } from "./ConditionalModifierStages";
+import { OutOfRangeError } from "./targetSequenceUtils";
 
 export default class InstanceStage implements ModifierStage {
   constructor(
@@ -32,6 +33,8 @@ export default class InstanceStage implements ModifierStage {
         return this.handleRelativeScope(target, this.modifier);
       case "everyScope":
         return this.handleEveryScope(target);
+      case "ordinalScope":
+        return this.handleOrdinalScope(target, this.modifier);
       default:
         throw Error(`${this.modifier.type} instance scope not supported`);
     }
@@ -41,7 +44,34 @@ export default class InstanceStage implements ModifierStage {
     const { editor } = target;
 
     return Array.from(
-      this.getTargetIterable(target, editor, editor.document.range, "forward"),
+      this.getTargetIterable(
+        target,
+        editor,
+        this.getEveryRange(editor),
+        "forward",
+      ),
+    );
+  }
+
+  private getEveryRange(editor: TextEditor): Range {
+    return editor.document.range;
+  }
+
+  private handleOrdinalScope(
+    target: Target,
+    { start, length }: OrdinalScopeModifier,
+  ): Target[] {
+    const { editor } = target;
+
+    return takeFromOffset(
+      this.getTargetIterable(
+        target,
+        editor,
+        this.getEveryRange(editor),
+        start >= 0 ? "forward" : "backward",
+      ),
+      start >= 0 ? start : -(length + start),
+      length,
     );
   }
 
@@ -51,26 +81,16 @@ export default class InstanceStage implements ModifierStage {
   ): Target[] {
     const { editor } = target;
 
-    const iterable = this.getTargetIterable(
-      target,
-      editor,
+    const iterationRange =
       direction === "forward"
         ? new Range(target.contentRange.start, editor.document.range.end)
-        : new Range(editor.document.range.start, target.contentRange.end),
-      direction,
-    );
-
-    // Skip the first `offset` targets
-    Array.from(itake(offset, iterable));
-
-    // Take the next `length` targets
-    const targets = Array.from(itake(length, iterable));
-
-    if (targets.length < length) {
-      throw new OutOfRangeError();
-    }
+        : new Range(editor.document.range.start, target.contentRange.end);
 
-    return targets;
+    return takeFromOffset(
+      this.getTargetIterable(target, editor, iterationRange, direction),
+      offset,
+      length,
+    );
   }
 
   private getTargetIterable(
@@ -139,3 +159,31 @@ function getFilterScopeType(target: Target): ScopeType | null {
 
   return null;
 }
+
+/**
+ * Take `length` items from `iterable` starting at `offset`, throwing an error
+ * if there are not enough items.
+ *
+ * @param iterable The iterable to take from
+ * @param offset How many items to skip
+ * @param count How many items to take
+ * @returns An array of length `length` containing the items from `iterable`
+ * starting at `offset`
+ */
+function takeFromOffset<T>(
+  iterable: Iterable<T>,
+  offset: number,
+  count: number,
+): T[] {
+  // Skip the first `offset` targets
+  Array.from(itake(offset, iterable));
+
+  // Take the next `length` targets
+  const items = Array.from(itake(count, iterable));
+
+  if (items.length < count) {
+    throw new OutOfRangeError();
+  }
+
+  return items;
+}

packages/cursorless-vscode-e2e/src/suite/fixtures/recorded/instants/clearSecondLastInstanceAir.yml

@@ -0,0 +1,30 @@
+languageId: plaintext
+command:
+  version: 5
+  spokenForm: clear second last instance air
+  action: {name: clearAndSetSelection}
+  targets:
+    - type: primitive
+      modifiers:
+        - type: ordinalScope
+          scopeType: {type: instance}
+          start: -2
+          length: 1
+      mark: {type: decoratedSymbol, symbolColor: default, character: a}
+  usePrePhraseSnapshot: true
+initialState:
+  documentContents: |
+    aaa bbb ccc aaa ddd aaa eee
+  selections:
+    - anchor: {line: 1, character: 0}
+      active: {line: 1, character: 0}
+  marks:
+    default.a:
+      start: {line: 0, character: 20}
+      end: {line: 0, character: 23}
+finalState:
+  documentContents: |
+    aaa bbb ccc  ddd aaa eee
+  selections:
+    - anchor: {line: 0, character: 12}
+      active: {line: 0, character: 12}

packages/cursorless-vscode-e2e/src/suite/fixtures/recorded/modifiers/instance/clearFirstTwoInstancesAir.yml

@@ -0,0 +1,32 @@
+languageId: plaintext
+command:
+  version: 5
+  spokenForm: clear first two instances air
+  action: {name: clearAndSetSelection}
+  targets:
+    - type: primitive
+      modifiers:
+        - type: ordinalScope
+          scopeType: {type: instance}
+          start: 0
+          length: 2
+      mark: {type: decoratedSymbol, symbolColor: default, character: a}
+  usePrePhraseSnapshot: true
+initialState:
+  documentContents: |
+    aaa bbb ccc aaa ddd aaa eee
+  selections:
+    - anchor: {line: 1, character: 0}
+      active: {line: 1, character: 0}
+  marks:
+    default.a:
+      start: {line: 0, character: 0}
+      end: {line: 0, character: 3}
+finalState:
+  documentContents: |2
+     bbb ccc  ddd aaa eee
+  selections:
+    - anchor: {line: 0, character: 0}
+      active: {line: 0, character: 0}
+    - anchor: {line: 0, character: 9}
+      active: {line: 0, character: 9}

packages/cursorless-vscode-e2e/src/suite/fixtures/recorded/modifiers/instance/clearLastTwoInstancesAir.yml

@@ -0,0 +1,32 @@
+languageId: plaintext
+command:
+  version: 5
+  spokenForm: clear last two instances air
+  action: {name: clearAndSetSelection}
+  targets:
+    - type: primitive
+      modifiers:
+        - type: ordinalScope
+          scopeType: {type: instance}
+          start: -2
+          length: 2
+      mark: {type: decoratedSymbol, symbolColor: default, character: a}
+  usePrePhraseSnapshot: true
+initialState:
+  documentContents: |
+    aaa bbb ccc aaa ddd aaa eee
+  selections:
+    - anchor: {line: 1, character: 0}
+      active: {line: 1, character: 0}
+  marks:
+    default.a:
+      start: {line: 0, character: 0}
+      end: {line: 0, character: 3}
+finalState:
+  documentContents: |
+    aaa bbb ccc  ddd  eee
+  selections:
+    - anchor: {line: 0, character: 12}
+      active: {line: 0, character: 12}
+    - anchor: {line: 0, character: 17}
+      active: {line: 0, character: 17}