#pragma once
#include "AST/NumberNode.h"
#include "AST/SumNode.h"
#include "Error.h"
#include "Lexer.h"
#include "Result.h"
#include "sapphirepch.h"

/* Parser class for the Sapphire compiler. */
class Parser
{
  private:
    Parser(const TokenStream& tokens);
    TokenStream tokens;
    int index = -1;
    int advance();
    Token* current_token;

    Result<ExprNode> factor();
    Result<ExprNode> expr();
    Result<ExprNode> term();

  public:
    /* Construct a new Parser with the given TokenStream. */
    static std::shared_ptr<Parser> new_parser(const TokenStream& tokens);
    /* Parse the stored TokenStream and return the top-level node of the result Abstract Syntax Tree. */
    std::shared_ptr<ASTNode> parse();
};