feat: implement method declarations

Author: aymaneelmaini

src/chunk.h

@@ -38,6 +38,7 @@ typedef enum
     OP_CLOSE_UPVALUE,
     OP_RETURN,
     OP_CLASS,
+    OP_METHOD,
 } OpCode;
 
 typedef struct

src/compiler.c

@@ -764,17 +764,34 @@ static void function(FunctionType type)
     }
 }
 
+static void method()
+{
+    consume(TOKEN_IDENTIFIER, "Expect method name.");
+    u8 constant = identifier_constant(&parser.previous);
+
+    FunctionType type = TYPE_FUNCTION;
+    function(type);
+
+    emit_bytes(OP_METHOD, constant);
+}
 static void class_declaration()
 {
     consume(TOKEN_IDENTIFIER, "Expect class name.");
-    u8 name_constant = identifier_constant(&parser.previous);
+    Token class_name = parser.previous;
+    u8    name_constant = identifier_constant(&parser.previous);
     declare_variable(true);
 
     emit_bytes(OP_CLASS, name_constant);
     define_variable(name_constant, true);
 
+    named_variable(class_name, false);
     consume(TOKEN_LEFT_BRACE, "Expected '{' after class name");
+    while (!check(TOKEN_RIGHT_BRACE) && !check(TOKEN_EOF))
+    {
+        method();
+    }
     consume(TOKEN_RIGHT_BRACE, "Expected '}' after class body");
+    emit_byte(OP_POP);
 }
 
 static void fun_declaration()

src/memory.c

@@ -95,6 +95,7 @@ static void blacken_object(Obj* object)
     case OBJ_CLASS:
         ObjClass* klass = (ObjClass*)object;
         mark_object((Obj*)klass->name);
+        mark_table(&klass->methods);
         break;
     case OBJ_CLOSURE:
         ObjClosure* closure = (ObjClosure*)object;
@@ -133,6 +134,8 @@ static void free_object(Obj* object)
     switch (object->type)
     {
     case OBJ_CLASS:
+        ObjClass* klass = (ObjClass*)object;
+        free_table(&klass->methods);
         FREE(ObjClass, object);
         break;
     case OBJ_CLOSURE:

src/object.c

@@ -33,6 +33,7 @@ ObjClass* new_class(ObjString* name)
 {
     ObjClass* klass = ALLOCATE_OBJ(ObjClass, OBJ_CLASS);
     klass->name = name;
+    init_table(&klass->methods);
     return klass;
 }
 

src/object.h

@@ -91,6 +91,7 @@ typedef struct ObjClass
 {
     Obj        obj;
     ObjString* name;
+    Table      methods;
 } ObjClass;
 
 typedef struct ObjInstance