Set completion range for invalid token

actions-languageservice/src/complete.test.ts

@@ -374,6 +374,37 @@ jobs:
     });
   });
 
+
+  it("sets a range for invalid tokens", async () => {
+    const input = "on: push\njobs:\n  build:\n    runs-o|";
+    const result = await complete(...getPositionFromCursor(input));
+
+    expect(result).not.toBeUndefined();
+    expect(result.map(e => e.label)).toContain("runs-on");
+
+    let textEdit = result.filter(e => e.label === "runs-on")[0].textEdit as TextEdit;
+    expect(textEdit.newText).toEqual("runs-on");
+    expect(textEdit.range).toEqual({
+      start: {line: 3, character: 4},
+      end: {line: 3, character: 10}
+    });
+  });
+
+  it("sets a 0-length range while no initial token", async () => {
+    const input = "on: push\njobs:\n  build:\n    |";
+    const result = await complete(...getPositionFromCursor(input));
+
+    expect(result).not.toBeUndefined();
+    expect(result.map(e => e.label)).toContain("runs-on");
+
+    let textEdit = result.filter(e => e.label === "runs-on")[0].textEdit as TextEdit;
+    expect(textEdit.newText).toEqual("runs-on");
+    expect(textEdit.range).toEqual({
+      start: {line: 3, character: 4},
+      end: {line: 3, character: 4}
+    });
+  });
+
   describe("completes with indentation", () => {
     it("default indentation", async () => {
       const input = `on: push

actions-languageservice/src/complete.ts

@@ -103,6 +103,13 @@ export async function complete(
   if (token?.range) {
     replaceRange = mapRange(token.range);
   }
+  else if (!token) {
+    // Not a valid token, create a range from the current position
+    const line = newDoc.getText({start: {line: position.line, character: 0}, end: position});
+    // Get the length of the current word
+    const val = line.match(/[\w_-]*$/)?.[0].length || 0;
+    replaceRange = Range.create({ line: position.line, character: position.character - val } as Position, position);
+  }
 
   return values.map(value => {
     const newText = value.insertText || value.label;