[VER] 0.3.3-alpha

[FEAT] interface + impl 支持！ Duck Typing + 严格的检查让语言健壮
[FEAT][IMPL] 增加辅助函数 isTypeMatch等
[IMPL] TypeInfo构造函数FString 现在 explicit

src/Ast/Statements/InterfaceDefSt.hpp

@@ -0,0 +1,59 @@
+#pragma once
+
+#include <Ast/functionParameters.hpp>
+#include <Ast/astBase.hpp>
+
+
+namespace Fig::Ast
+{
+    /*
+    
+    interface Readable
+    {
+        read() -> String
+        {
+            // default
+        }
+        
+        flush() -> Null; // non-default
+    }
+    
+    */
+
+
+    struct InterfaceMethod
+    {
+        FString name;
+        FunctionParameters paras;
+        FString returnType;
+
+        BlockStatement defaultBody = nullptr; // nullptr is non-default func
+
+        bool hasDefaultBody() const
+        {
+            return defaultBody != nullptr;
+        }
+    };
+
+    class InterfaceDefAst final : public StatementAst
+    {
+    public:
+        FString name;
+        std::vector<InterfaceMethod> methods;
+        std::vector<FString> parents; // Feature, NOT NOW
+        bool isPublic;
+
+        InterfaceDefAst()
+        {
+            type = AstType::InterfaceDefSt;
+        }
+
+        InterfaceDefAst(FString _name, std::vector<InterfaceMethod> _methods, bool _isPublic) :
+            name(std::move(_name)), methods(std::move(_methods)), isPublic(_isPublic)
+        {
+            type = AstType::InterfaceDefSt;
+        }
+    };
+
+    using InterfaceDef = std::shared_ptr<InterfaceDefAst>;
+};