package main

import (
	"errors"
	"flag"
	"fmt"
	"io"
	"io/ioutil"
	"os"
)

//

func main() {
	src := flag.String("Src", "", "Input file")
	flag.Parse()

	fh, err := os.OpenFile(*src, os.O_RDONLY, 0644)
	if err != nil {
		panic(err)
	}

	assemble(fh, ioutil.Discard)
}

func assemble(src io.Reader, dest io.Writer) {
	lx := NewLexer(src)
	cc := NewCompiler()

mainloop:
	for {
		tok, err := lx.Next()
		if err != nil {
			if errors.Is(err, io.EOF) {
				// Reached EOF
				// Terminate compilation
				break mainloop
			}

			// Real error
			panic(err)
		}

		fmt.Printf("[line %d] %#v\n", lx.lineno, tok)

		err = cc.Compile(tok)
		if err != nil {
			panic(err)
		}

	}

	err := cc.Finalize(dest)
	if err != nil {
		panic(err)
	}
}