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色々な言語で簡単なREPLを実装する #golang

Last updated at Posted at 2023-12-03

続きです。

REPLとは

こちらの記事を参照してください。

Goで実装する

main.go

package main

import (
	"bufio"
	"fmt"
	"os"
)

func main() {
	scanner := bufio.NewScanner(os.Stdin)
cmd:
	for {
		fmt.Print("go> ")
		if !scanner.Scan() {
			break
		}
		prompt := scanner.Text()
		switch prompt {
		case "exit":
			fmt.Println("Bye!")
			break cmd
		default:
			fmt.Println(prompt)
		}
	}
}

実行する

$ go mod edit -module=example.com/app
$ go build
$ ./app
go> 1 + 1
1 + 1
go> foobar
foobar
go> baz
baz
go> exit
Bye!

CTRL-CやCTRL-Dの処理を実装しておけばよかったかも。

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