feat: replace symbols works

symbol.ts

@@ -1,37 +1,75 @@
+import { RHS } from "snippet";
+
 export enum Symbol {
 	// on parse
-	Newline = "\\nl\\",
+	Newline = "%\\n",
-	Tab = "\\tab\\",
+	Tab = "%\\t",
 	// on replace
-	CursorEnd = "\\end\\",
+	CursorEnd = "%\\e",
 }
 
 export namespace Symbol {
-	export const MAP: Record<string, string> = {
+	const REPLACEABLE: Record<string, string> = {
 		[Symbol.Newline]: "\n",
 		[Symbol.Tab]: "\t",
-		[Symbol.CursorEnd]: "",
 	};
-	export function replaceSymbols(inputStr: string): string {
+	// const ON_REPLACE: Record<string, string> = {
+	// 	[Symbol.CursorEnd]: "",
+	// };
+	export function replaceSymbolsOnParse(inputStr: string): RHS {
 		const result: string[] = [];
+		const len = inputStr.length;
 		let i = 0;
-
+		let cursor = 0;
+		let endFoundIdx = 0;
+		let found;
 		while (i < inputStr.length) {
-			let found = false;
+			found = false;
-			for (const symbol in MAP) {
+			for (const symbol in REPLACEABLE) {
 				if (inputStr.startsWith(symbol, i)) {
-					result.push(MAP[symbol]);
+					result.push(REPLACEABLE[symbol]);
+					console.log(REPLACEABLE[symbol]);
+					cursor += REPLACEABLE[symbol].length;
 					i += symbol.length;
 					found = true;
 					break;
 				}
 			}
+			// Check for cursorEnd symbol.
+			if (inputStr.startsWith(Symbol.CursorEnd, i)) {
+				i += Symbol.CursorEnd.length;
+				// cursor marks the index in final string, we derive the "how far to move left" from it
+				endFoundIdx = cursor;
+				found = true;
+			}
 			if (!found) {
 				result.push(inputStr[i]);
+				cursor++;
 				i++;
 			}
 		}
+		let data = result.join("");
+		let info = {
+			cursorEnd: data.length - endFoundIdx,
+		};
 
-		return result.join("");
+		return { data, info };
 	}
 }
+
+// Some tests!
+// let rhs1 = Symbol.replaceSymbolsOnParse("123%\\e45678");
+// console.log(rhs1);
+// let rhs2 = Symbol.replaceSymbolsOnParse("12345678%\\e");
+// console.log(rhs2);
+// let rhs3 = Symbol.replaceSymbolsOnParse("%\\e12345678");
+// console.log(rhs3);
+// let rhs4 = Symbol.replaceSymbolsOnParse("12%\\e3");
+// console.log(rhs4);
+// let rhs5 = Symbol.replaceSymbolsOnParse("1%\\e23");
+// console.log(rhs5);
+// let rhs6 = Symbol.replaceSymbolsOnParse("%\\e123");
+// console.log(rhs6);
+// let rhs7 = Symbol.replaceSymbolsOnParse("123%\\n4%\\e56");
+// console.log(rhs7);
+// console.log(rhs7.data);