main.go

package main

import (
	"bufio"
	"flag"
	"fmt"
	"io"
	"os"

	"github.com/drewhayward/glox/lox"
)

func runFile(path string, debug bool) {
	file, err := os.Open(path)
	if err != nil {
		fmt.Fprintln(os.Stderr, "Error:", err)
		os.Exit(1)
	}

	defer file.Close()

	data, err := io.ReadAll(file)
	if err != nil {
		fmt.Fprintln(os.Stderr, "Error:", err)
		os.Exit(1)
	}
	rs := lox.NewRuntimeState()
	rs.Debug = debug
	err = rs.Run(string(data))
	if err != nil {
		os.Exit(1)
	}
}

func runPrompt(debug bool) {
	scanner := bufio.NewScanner(os.Stdin)
	rs := lox.NewRuntimeState()
	rs.Debug = debug
	print("> ")
	for scanner.Scan() {
		line := scanner.Text()
		rs.Run(line)

		print("> ")
	}
}

func main() {
	debug := flag.Bool("v", false, "Debug parsing and lexing")
	flag.Parse()
	args := flag.Args()

	if len(args) == 0 {
		fmt.Println("Usage: glox [script]")
		runPrompt(*debug)
	} else if len(args) == 1 {
		runFile(args[0], *debug)
	}
}