Move more logic into sync-client

frontend/sync-client/src/utils/line-and-column-to-position.test.ts

@@ -0,0 +1,44 @@
+import { describe, it } from "node:test";
+import assert from "node:assert";
+import { lineAndColumnToPosition } from "./line-and-column-to-position";
+
+describe("lineAndColumnToPosition", () => {
+	it("should return the correct position for the first line", () => {
+		const text = "Hello\nWorld";
+		const position = lineAndColumnToPosition(text, 0, 3);
+		assert.strictEqual(position, 3);
+	});
+
+	it("should return the correct position for the second line", () => {
+		const text = "Hello\nWorld";
+		const position = lineAndColumnToPosition(text, 1, 2);
+		assert.strictEqual(position, 8);
+	});
+
+	it("should return the correct position for an empty string", () => {
+		const text = "";
+		const position = lineAndColumnToPosition(text, 0, 0);
+		assert.strictEqual(position, 0);
+	});
+
+	it("with carrige return", () => {
+		assert.strictEqual(lineAndColumnToPosition("a\nb", 1, 1), 3);
+		assert.strictEqual(lineAndColumnToPosition("a\r\nb", 1, 1), 3);
+	});
+
+	it("should handle multi-line strings with varying lengths", () => {
+		const text = "Line1\nLongerLine2\nShort3";
+		const position = lineAndColumnToPosition(text, 2, 4);
+		assert.strictEqual(position, 22);
+	});
+
+	it("should throw an error if the line number is out of range", () => {
+		const text = "Line1\nLine2";
+		assert.throws(() => lineAndColumnToPosition(text, 3, 0));
+	});
+
+	it("should throw an error if the column number is out of range", () => {
+		const text = "Line1\nLine2";
+		assert.throws(() => lineAndColumnToPosition(text, 1, 10));
+	});
+});