[Feat] 详细区分左值(LvObject)与右值(RvObject -> ObjectPtr)

[Impl] 重构evaluator.cpp + hpp 全部
[Feat] 增加对于IndexExpr的解析
[Fix][Impl] 现在点运算符不由BinaryExpr负责,增加MemberExpr,单独实现解析
[Impl] 项目目录全部翻修, src/目录下单独文件夹放置每一个模块

src/Ast/Statements/IfSt.hpp

@@ -0,0 +1,68 @@
+#pragma once
+
+#include <Ast/astBase.hpp>
+
+namespace Fig::Ast
+{
+    class ElseSt final : public StatementAst
+    {
+    public:
+        BlockStatement body;
+        ElseSt()
+        {
+            type = AstType::ElseSt;
+        }
+        ElseSt(BlockStatement _body) :
+            body(_body)
+        {
+            type = AstType::ElseSt;
+        }
+        virtual FString toString() override
+        {
+            return FString(std::format("<Else Ast at {}:{}>", aai.line, aai.column));
+        }
+    };
+    using Else = std::shared_ptr<ElseSt>;
+    class ElseIfSt final : public StatementAst
+    {
+    public:
+        Expression condition;
+        BlockStatement body;
+        ElseIfSt()
+        {
+            type = AstType::ElseIfSt;
+        }
+        ElseIfSt(Expression _condition,
+                 BlockStatement _body) :
+            condition(_condition), body(_body)
+        {
+            type = AstType::ElseIfSt;
+        }
+        virtual FString toString() override
+        {
+            return FString(std::format("<ElseIf Ast at {}:{}>", aai.line, aai.column));
+        }
+    };
+    using ElseIf = std::shared_ptr<ElseIfSt>;
+    class IfSt final : public StatementAst
+    {
+    public:
+        Expression condition;
+        BlockStatement body;
+        std::vector<ElseIf> elifs;
+        Else els;
+        IfSt()
+        {
+            type = AstType::IfSt;
+        }
+        IfSt(Expression _condition,
+             BlockStatement _body,
+             std::vector<ElseIf> _elifs,
+             Else _els) :
+            condition(_condition), body(_body), elifs(_elifs), els(_els)
+        {
+            type = AstType::IfSt;
+        }
+    };
+    using If = std::shared_ptr<IfSt>;
+}; // namespace Fig