Parser.h

#ifndef PARSER_H
#define PARSER_H
#include <vector>
#include <sstream>
#include "Node.h"
#include "Program.h"
#include "Lexer.h"

class Parser
{
public:
    Parser(std::wstringstream& str);

    Program parse();

    Token skipEmptyLines();

    Node *begin();
    std::vector<Node*> declarations();
    Node *declaration();

    std::vector<Node*> operations();
    Node *operation();
    Node *variable();
    Node *expression();

    Node *end();

private:
    Token getNextToken();
    int getPriority(Token::Type operation);

    void check(Token token, std::initializer_list<Token::Type> types);

    Token prevToken, curToken;
    bool stepBack = false;

    Lexer lexer;
    std::vector<std::wstring> varList;
};

#endif // PARSER_H