import assert from "node:assert";
import { describe, it } from "node:test";
import { isMouseSequence, isWheelDown, isWheelUp, parseSgrMouseEvent } from "../src/mouse.js";
import { StdinBuffer } from "../src/stdin-buffer.js";
describe("parseSgrMouseEvent", () => {
it("parses wheel up and wheel down", () => {
const up = parseSgrMouseEvent("\x1b[<64;10;5M");
assert.deepStrictEqual(up, {
button: 64,
x: 10,
y: 5,
press: true,
motion: false,
shift: false,
alt: false,
ctrl: false,
});
assert.strictEqual(isWheelUp(up!), true);
assert.strictEqual(isWheelDown(up!), false);
const down = parseSgrMouseEvent("\x1b[<65;1;1M");
assert.strictEqual(isWheelDown(down!), true);
assert.strictEqual(isWheelUp(down!), false);
});
it("strips modifier bits into flags", () => {
const event = parseSgrMouseEvent("\x1b[<84;3;7M");
assert.strictEqual(event!.button, 64);
assert.strictEqual(event!.shift, true);
assert.strictEqual(event!.ctrl, true);
assert.strictEqual(event!.alt, false);
assert.strictEqual(isWheelUp(event!), true);
});
it("distinguishes press from release", () => {
assert.strictEqual(parseSgrMouseEvent("\x1b[<0;5;5M")?.press, true);
assert.strictEqual(parseSgrMouseEvent("\x1b[<0;5;5m")?.press, false);
});
it("flags drag motion and strips the motion bit from the button", () => {
const drag = parseSgrMouseEvent("\x1b[<32;5;5M");
assert.strictEqual(drag?.motion, true);
assert.strictEqual(drag?.button, 0);
assert.strictEqual(parseSgrMouseEvent("\x1b[<0;5;5M")?.motion, false);
});
it("returns null for non-mouse input", () => {
assert.strictEqual(parseSgrMouseEvent("\x1b[A"), null);
assert.strictEqual(parseSgrMouseEvent("a"), null);
assert.strictEqual(parseSgrMouseEvent("\x1b[<64;10M"), null);
});
});
describe("isMouseSequence", () => {
it("matches SGR and legacy mouse reports", () => {
assert.strictEqual(isMouseSequence("\x1b[<64;10;5M"), true);
assert.strictEqual(isMouseSequence("\x1b[M "), true);
assert.strictEqual(isMouseSequence("\x1b[A"), false);
});
});
describe("SGR mouse through StdinBuffer", () => {
it("assembles a sequence that arrives split across chunks", () => {
const buffer = new StdinBuffer({ timeout: 10 });
const received: string[] = [];
buffer.on("data", (seq) => received.push(seq));
buffer.process("\x1b");
buffer.process("[<64");
buffer.process(";20;5M");
assert.deepStrictEqual(received, ["\x1b[<64;20;5M"]);
const event = parseSgrMouseEvent(received[0]!);
assert.strictEqual(event!.button, 64);
assert.strictEqual(event!.x, 20);
assert.strictEqual(event!.y, 5);
buffer.destroy();
});
it("assembles a DECRPM mouse-probe response", () => {
const buffer = new StdinBuffer({ timeout: 10 });
const received: string[] = [];
buffer.on("data", (seq) => received.push(seq));
buffer.process("\x1b[?1006;");
buffer.process("2$y");
assert.deepStrictEqual(received, ["\x1b[?1006;2$y"]);
buffer.destroy();
});
});