feat: add while loops to the formatter

src/formatter/formatter_tests.rs

@@ -536,6 +536,42 @@ let a = 10;
         let expected = r#"puts("Hello, Monkey!");
 let arr = [1, 2, 3];
 let length = len(arr);
+"#;
+
+        assert_eq!(format(input), expected);
+    }
+
+    #[test]
+    fn test_while() {
+        let input = r#"
+        let a = 1;
+    while (a<3){
+let a = a + 1,
+puts(21);
+    }
+    let a = fn (x){
+        let a = 1;
+        while (x > 0){
+            let a = a * 2;
+        }
+        a
+    };
+    a(12);
+        "#;
+
+        let expected = r#"let a = 1;
+while (a < 3) {
+    let a = a + 1;
+    puts(21);
+}
+let a = fn (x) {
+    let a = 1;
+    while (x > 0) {
+        let a = a * 2;
+    }
+    a
+};
+a(12);
 "#;
 
         assert_eq!(format(input), expected);

src/formatter/mod.rs

@@ -112,6 +112,16 @@ impl Formatter {
                     self.push(";");
                 }
             }
+            Statement::While(wh) => {
+                self.push("while (");
+                self.visit_expression(&wh.condition);
+                self.push(") {\n");
+                self.indent += 1;
+                self.visit_block_statement(&wh.body);
+                self.indent -= 1;
+                self.push_indent();
+                self.push("}");
+            }
         }
         self.push("\n");
         self.last_expression = None;