Monkey/repl/repl.go

package repl

import (
	"bufio"
	"fmt"
	"github/runnignwater/monkey/lexer"
	"github/runnignwater/monkey/token"
	"io"
)

/**
 * @Author: simon
 * @Author: ynwdlxm@163.com
 * @Date: 2022/10/2 下午5:41
 * @Desc: REPL that tokenizes Monkey source code and prints the tokens
 */

const PROMPT = ">>> "

func Start(in io.Reader, out io.Writer) {
	scanner := bufio.NewScanner(in)

	for {
		fmt.Printf(PROMPT)
		scan := scanner.Scan()
		if !scan {
			return
		}
		line := scanner.Text()

		l := lexer.New(line)

		for tok := l.NextToken(); tok.Type != token.EOF; tok = l.NextToken() {
			fmt.Printf("%+v\n", tok)
		}
	}
}