node.js stdio example

nodejs_stdio_example.js

const STDIN = {
  DEFAULT    : Symbol(),
  ALL        : Symbol(),
  BEFORE_ALL : Symbol(),
  AFTER_ALL  : Symbol(),
}

class ProcessStdio {
    constructor(encoding='utf8') {
        this.encoding = encoding
        this.events = []
        this.listeners = {}
    }
    set encoding(e) {
        process.stdin.setEncoding(e)
        process.stdout.setEncoding(e)
        process.stderr.setEncoding(e)
    }
    get encoding() {
        return process.stdin._readableState.encoding
    }
    //TODO ターミネーターの送り方を調べる
    input(data, terminator='\n') {
        process.stdin.write(data + terminator)
    }
    output(data, terminator='\n') {
        process.stdout.write(data + terminator)
    }
    error(data, terminator='\n') {
        process.stderr.write(data + terminator)
    }
    exit(code=0) {
        process.exit(code)
    }
    on(event, listener, once=false) {
        this.events.push(event)
        this.listeners[event] = {listener:listener,once:once}
        switch(Object.prototype.toString.call(event).slice(8,-1).toLowerCase()) {
        case 'string':
            process.stdin.on('data', (data) => {
                let d = data.replace(/\n$/,'')
                if (this.listeners[d]) {
                    this.listeners[d].listener(d)
                    if (this.listeners[d].once) {
                        delete this.events[this.events.indexOf(d)]
                        delete this.listeners[d]
                    }
                }
            })
            break
        case 'symbol':
            switch(event) {
            case STDIN.DEFAULT:
                process.stdin.on('data', (data) => {
                    let d = data.replace(/\n$/,'')
                    if (this.events.indexOf(d)==-1) {
                        this.listeners[event].listener(d)
                        if (this.listeners[event].once) {
                            delete this.events[this.events.indexOf(event)]
                            delete this.listeners[event]
                        }
                    }
                })
                break
            case STDIN.ALL:
                process.stdin.on('data', (data) => {
                    this.listeners[event].listener(data.replace(/\n$/,''))
                    if (this.listeners[event].once) {
                        delete this.events[this.events.indexOf(event)]
                        delete this.listeners[event]
                    }
                })
                break
            }
            break
        case 'regexp':
            process.stdin.on('data', (data) => {
                let d = data.replace(/\n$/,'')
                if (event.test(d)) {
                    this.listeners[event].listener(d)
                    if (this.listeners[event].once) {
                        delete this.events[this.events.indexOf(event)]
                        delete this.listeners[event]
                    }
                }
            })
            break
        default:
            console.log('type is default')
            break
        }
    }
    once(event, listener) {
        this.on(event, listener, true)
    }
    emit(event, argument) { //ここも引数を熟考
        if (!argument) argument = event
        this.listeners[event].listener(argument)
    }
    onError(listener) {
    }
}

///////////////////////////////////////////

ans = Math.floor( Math.random() * (100) )

app = new ProcessStdio()
app.output('数当てゲーム!!')
app.output('1 〜 100 の間の整数を当ててください')

app.on(ans.toString(), () => {
    app.output(`正解!! ${ans}`)
    app.exit(0)
})

app.on('', () => {
    app.error('ゲームを中止しました。')
    app.error(`答えは ${ans} でした。`)
    app.exit(1)
})

app.once('hint', () => {
    if (ans > 50) {
        app.output('答えは50より大きいです')
    } else {
        app.output('答えは50以下です')
    }
})

app.on(/[^0-9]+/, (data) => {
    if (data == 'hint') {
        app.output('hintは一回だけ！')
    } else {
        app.error('半角数字の正数でお願いします')
    }
})

app.on(STDIN.DEFAULT, (data) => {
    let d = data.replace(/\n$/, '')
    if (d > 100 || d <= 0) {
        app.output(`答えは 1 〜 100 の間で！`)
    } else if (d > ans) {
        app.output(`${d}は大きい`)
    } else if (d < ans) {
        app.output(`${d}は小さい`)
    }
})

app.on(STDIN.ALL, () => {
    app.output('答え：', '')
})

app.emit(STDIN.ALL)

// console.log(app)