ready to build AST

include/semantic/semantic.h

@@ -1,5 +1,18 @@
 #ifndef SEMANTIC_H
 #define SEMANTIC_H
 #include <ios>
-int SemanticCheck(std::istream &fin);
+#include "ast/ast.h"
+#include "visitor.h"
+
+class SemanticError : public std::exception {
+  std::string msg;
+  int error_code;
+
+ public:
+  SemanticError(const std::string &msg, int error_code) : msg(msg), error_code(error_code) {}
+  const char *what() const noexcept override { return msg.c_str(); }
+  int GetErrorCode() const { return error_code; }
+};
+std::shared_ptr<ASTNodeBase> BuildAST(Visitor *visitor, antlr4::tree::ParseTree *tree);
+void SemanticCheck(std::istream &fin, std::shared_ptr<ASTNodeBase> &ast);
 #endif