fix: correctly identify emoticons (#10108)

Signed-off-by: Adarsh Singh <thakurluckysinghbrh@gmail.com>

src/components/views/rooms/BasicMessageComposer.tsx

@@ -191,16 +191,19 @@ export default class BasicMessageEditor extends React.Component<IProps, IState>
     public replaceEmoticon(caretPosition: DocumentPosition, regex: RegExp): number {
         const { model } = this.props;
         const range = model.startRange(caretPosition);
-        // expand range max 8 characters backwards from caretPosition,
+        // expand range max 9 characters backwards from caretPosition,
         // as a space to look for an emoticon
-        let n = 8;
+        let n = 9;
         range.expandBackwardsWhile((index, offset) => {
             const part = model.parts[index];
             n -= 1;
             return n >= 0 && [Type.Plain, Type.PillCandidate, Type.Newline].includes(part.type);
         });
         const emoticonMatch = regex.exec(range.text);
-        if (emoticonMatch) {
+        // ignore matches at start of proper substrings
+        // so xd will not match if the string was "mixd 123456"
+        // and we are lookinh at xd 123456 part of the string
+        if (emoticonMatch && (n >= 0 || emoticonMatch.index !== 0)) {
             const query = emoticonMatch[1].replace("-", "");
             // try both exact match and lower-case, this means that xd won't match xD but :P will match :p
             const data = EMOTICON_TO_EMOJI.get(query) || EMOTICON_TO_EMOJI.get(query.toLowerCase());

test/components/views/rooms/BasicMessageComposer-test.tsx

@@ -24,34 +24,64 @@ import * as TestUtils from "../../../test-utils";
 import { MatrixClientPeg } from "../../../../src/MatrixClientPeg";
 import EditorModel from "../../../../src/editor/model";
 import { createPartCreator, createRenderer } from "../../../editor/mock";
+import SettingsStore from "../../../../src/settings/SettingsStore";
 
 describe("BasicMessageComposer", () => {
     const renderer = createRenderer();
     const pc = createPartCreator();
 
-    beforeEach(() => {
     TestUtils.stubClient();
-    });
 
-    it("should allow a user to paste a URL without it being mangled", () => {
-        const model = new EditorModel([], pc, renderer);
     const client: MatrixClient = MatrixClientPeg.get();
 
     const roomId = "!1234567890:domain";
     const userId = client.getSafeUserId();
-
     const room = new Room(roomId, client, userId);
 
+    it("should allow a user to paste a URL without it being mangled", async () => {
+        const model = new EditorModel([], pc, renderer);
+        render(<BasicMessageComposer model={model} room={room} />);
         const testUrl = "https://element.io";
         const mockDataTransfer = generateMockDataTransferForString(testUrl);
-
+        await userEvent.paste(mockDataTransfer);
-        render(<BasicMessageComposer model={model} room={room} />);
-        userEvent.paste(mockDataTransfer);
 
         expect(model.parts).toHaveLength(1);
         expect(model.parts[0].text).toBe(testUrl);
         expect(screen.getByText(testUrl)).toBeInTheDocument();
     });
+
+    it("should replaceEmoticons properly", async () => {
+        jest.spyOn(SettingsStore, "getValue").mockImplementation((settingName: string) => {
+            return settingName === "MessageComposerInput.autoReplaceEmoji";
+        });
+        userEvent.setup();
+        const model = new EditorModel([], pc, renderer);
+        render(<BasicMessageComposer model={model} room={room} />);
+
+        const tranformations = [
+            { before: "4:3 video", after: "4:3 video" },
+            { before: "regexp 12345678", after: "regexp 12345678" },
+            { before: "--:--)", after: "--:--)" },
+
+            { before: "we <3 matrix", after: "we ❤️ matrix" },
+            { before: "hello world :-)", after: "hello world 🙂" },
+            { before: ":) hello world", after: "🙂 hello world" },
+            { before: ":D 4:3 video :)", after: "😄 4:3 video 🙂" },
+
+            { before: ":-D", after: "😄" },
+            { before: ":D", after: "😄" },
+            { before: ":3", after: "😽" },
+        ];
+        const input = screen.getByRole("textbox");
+
+        for (const { before, after } of tranformations) {
+            await userEvent.clear(input);
+            //add a space after the text to trigger the replacement
+            await userEvent.type(input, before + " ");
+            const transformedText = model.parts.map((part) => part.text).join("");
+            expect(transformedText).toBe(after + " ");
+        }
+    });
 });
 
 function generateMockDataTransferForString(string: string): DataTransfer {