public JsObject evaluate(Env env)
{
JsExpression x = this.value == "" ? this.child[0] : this;
if (x.child.Count == 0)
{
return(CoreInterpreter.EvalSingleExpression(x, env));
}
else
{
if (x.value == "if")//考虑if内部变量作用域问题！！！Lexical Scope
{
return(CoreInterpreter.EvalIf(x, env));
}
else if (x.value == ".")
{
return(CoreInterpreter.EvalPointExpression(x, env));
}
else if (x.value == "while")
{
return(CoreInterpreter.EvalWhile(x, env));
}
else if (x.value == "return")
{
return(x.child[0].evaluate(env));
}
else if (x.value == "new")//build-in
{
return(x.child[0].evaluate(env));
}
else if (x.value == "var")//=
{
return(x.child[0].evaluate(env));
}
else if (x.value == "=")
{
return(env.AddDef(x.child[0].value, x.child[1].evaluate(env)));
}
else if (x.value == "function")
{
return(CoreInterpreter.EvalFunction(x, env));
}
//else if (x.value == "list")
//{
// return new LList(this.child.Skip(1).Select(item => item.evaluate(env)));
//}
else if (x.value == "{")
{
return(CoreInterpreter.EvalBlock(x, env));
}
else if (Env.builtins.ContainsKey(x.value))
{
return(CoreInterpreter.EvalBuiltIn(x, env));
}
else
{
//匿名函数和自定义函数调用
return(CoreInterpreter.EvalFunctionInvoke(x, env));
}
}
}
public JsObject(JsObject[] _objs, Env _scope)
{
objs = (JsObject[])_objs.Clone();
scope = _scope;
}
public static JsObject EvalBuiltIn(JsExpression x, Env env)
{
var args = x.child.ToArray();
return(Env.builtins[x.value](args, env));
}
public JsFunction(string[] args, JsExpression body, Env env)
{
this.args = args;
this.body = body;
this.env = env;
}
public JsArray(JsObject[] _items, Env _scope)
{
items = ((JsObject[])_items.Clone()).AsEnumerable() as List <JsObject>;
scope = _scope;
}
public JsArray()
{
items = new List <JsObject>();
dict = new Dictionary <JsObject, JsObject>();
scope = new Env();
}
public JsString(string _v, Env _scope)
{
val = _v;
scope = _scope;
}
public Env(Env outer = null)
{
this.outer = outer;
this.dict = new Dictionary<string, JsObject>();
}