feat: 新增对象字面量和属性访问表达式

src/interpreter/mod.rs

@@ -1,9 +1,11 @@
+pub mod builtins;
 pub mod env;
 pub mod interpreter;
 
 pub use env::Env;
 pub use interpreter::Interpreter;
 
+use std::collections::HashMap;
 use std::rc::Rc;
 use std::cell::RefCell;
 use std::fmt;
@@ -16,6 +18,7 @@ pub enum Value {
     String(String),
     Bool(bool),
     Nil,
+    Object(Rc<RefCell<HashMap<String, Value>>>),
     Function(Rc<Function>),
     NativeFunction(NativeFn),
 }
@@ -27,6 +30,7 @@ impl std::fmt::Debug for Value {
             Value::String(s) => write!(f, "String({:?})", s),
             Value::Bool(b) => write!(f, "Bool({:?})", b),
             Value::Nil => write!(f, "Nil"),
+            Value::Object(_) => write!(f, "Object(...)"),
             Value::Function(_) => write!(f, "Function(...)"),
             Value::NativeFunction(_) => write!(f, "NativeFunction(...)"),
         }
@@ -40,6 +44,7 @@ impl fmt::Display for Value {
             Value::String(s) => write!(f, "{}", s),
             Value::Bool(b) => write!(f, "{}", b),
             Value::Nil => write!(f, "nil"),
+            Value::Object(_) => write!(f, "<object>"),
             Value::Function(_) => write!(f, "<function>"),
             Value::NativeFunction(_) => write!(f, "<native function>"),
         }