ast.h

#ifndef AST_H
#define AST_H

#include <iostream>
using namespace std;

enum NodeType {
	N_NULL, 
	N_Number, N_Variable, 
	N_Assign, N_UnaryOp,
	N_Add, N_Subtract, N_Multipy, N_Divide,
	N_dummyOpenParen, N_dummyCloseParen
};

class ASTNode {
	public:
		ASTNode* left;
		ASTNode* right;
		
		NodeType type;
		string nodeValue;
		
		ASTNode(NodeType initNodeType);
		void init_NumberNode(string number);
		void init_VariableNode(string var);
		void init_AssignNode(ASTNode* var, ASTNode* expression);
		void init_UnaryOperator(string sign, ASTNode* atom); //atom will always be left node
		void init_AddNode(ASTNode* opLeft, ASTNode* opRight);
		void init_SubtractNode(ASTNode* opLeft, ASTNode* opRight);
		void init_MultiplyNode(ASTNode* opLeft, ASTNode* opRight);
		void init_DivideNode(ASTNode* opLeft, ASTNode* opRight);
};

void deleteAST(ASTNode* &root);
#endif