lox.cpp

#include <fstream>
#include <iostream>
#include <sstream>

#include "scanner.h"
#include "token.h"

bool g_hadError = false;

void report(int line, const std::string& where, const std::string& msg)
{
    std::cerr << "[line " << line << "] Error" << where << ": " << msg << std::endl;
    g_hadError = true;
}

void error(int line, const std::string& msg)
{
    report(line, "", msg);
}

void error(const token& tok, const std::string& msg)
{
    if (tok.type == END_OF_FILE) {
        report(tok.line, " at end", msg);
    } else {
        report(tok.line, " at '" + tok.lexeme + "'", msg);
    }
}

void run(const std::string& source)
{
    scanner scanner(source);
    std::vector<token> tokens = scanner.scan_tokens();

    for (const token& token : tokens)
    {
        std::cout << token << '\n';
    }
}

void run_file(const std::string& path)
{
    std::ifstream file(path);
    if (!file)
    {
        std::cerr << "Unable to open file: " << path << std::endl;
        return;
    }
    std::ostringstream ss;
    ss << file.rdbuf();
    std::string source = ss.str();
    run(source);

    if (g_hadError) std::exit(65);
}

void run_prompt()
{
    while (true)
    {
        std::cout << "> ";
        std::string line;
        if (!std::getline(std::cin, line)) break;
        run(line);
        g_hadError = false;
    }
}