Separate input validation and extend PIS functions

src/inputValidation/inputValidation.ts

@@ -0,0 +1,25 @@
+import { ValidationError } from "../errors";
+
+export function validatePisCode(code: string): boolean {
+    const codeRegex = /^\d{4}$/;
+    if (!codeRegex.test(code)) {
+        throw new ValidationError("Invalid input: code must be a four-character string consisting of only numerals");
+    }
+    return true;
+}
+
+export function validateTiploc(tiploc: string): boolean {
+    const tiplocRegex = /[a-zA-z0-9]{4,7}/;
+    if (!tiplocRegex.test(tiploc)) {
+        throw new ValidationError("Invalid input: TIPLOC must be between four and seven characters");
+    }
+    return true;
+}
+
+export function validateCrs(crs: string): boolean {
+    const crsRegex = /[a-zA-z]{3}/;
+    if (!crsRegex.test(crs)) {
+        throw new ValidationError("Invalid input: CRS/3ALPHA must be exactly three letters")
+    }
+    return true;
+}