Add callee expression parsing

src/lang/abstractSyntaxTree.test.ts

@@ -143,4 +143,50 @@ const newVar = myVar + 1
       },
     ]);
   });
+  test('test using std function "log"', () => {
+    const code = `log(5, "hello", aIdentifier)`;
+    const tokens = lexer(code);
+    const { body } = abstractSyntaxTree(tokens);
+    expect(body).toEqual([
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 28,
+        "expression": {
+          "type": "CallExpression",
+          "start": 0,
+          "end": 28,
+          "callee": {
+            "type": "Identifier",
+            "start": 0,
+            "end": 3,
+            "name": "log"
+          },
+          "arguments": [
+            {
+              "type": "Literal",
+              "start": 4,
+              "end": 5,
+              "value": 5,
+              "raw": "5"
+            },
+            {
+              "type": "Literal",
+              "start": 7,
+              "end": 14,
+              "value": "hello",
+              "raw": "\"hello\""
+            },
+            {
+              "type": "Identifier",
+              "start": 16,
+              "end": 27,
+              "name": "aIdentifier"
+            }
+          ],
+          "optional": false
+        }
+      }
+    ]);
+  });
 });