parser.h

#ifndef PARSER_H
#define PARSER_H

#include "AST.h"
#include "Lexer.h"
#include "llvm/Support/raw_ostream.h"

class Parser {
    Lexer &Lex;
    Token Tok;
    bool HasError;

    void error() 
    {
        llvm::errs() << "Unexpected: " << Tok.getText() << "\n";
        HasError = true;
    }
    void advance() { Lex.next(Tok); }

    bool expect(Token::TokenKind Kind) 
    {
        if (Tok.getKind() != Kind) 
        {
            error();
            return true;
        }
        return false;
    }

    bool consume(Token::TokenKind Kind) 
    {
        if (expect(Kind))
            return true;
        advance();
        return false;
    }

    AST *parseGoal();
    Expr *parseDec();
    Expr *parseEquation();
    Expr *parseExpr();
    Expr *parseTerm();
    Expr *parseFactor();
    Expr *parseFinal();
    Expr *parseCondition();
    Expr *parseIf();
    Expr *parseElif();
    Expr *parseElse();
    Expr *parseC();
    Expr *parseLoop();

    public:
    Parser(Lexer &Lex) : Lex(Lex), HasError(false) { advance(); }

    bool HasError() {return HasError(); }

    AST *parse();
};

#endif