A collection to kotlin extension functions to manage different credit card

CreditCardUtils.kt

const val CARD_NUMBER_SEPARATOR = " "
const val CARD_DATE_SEPARATOR = "/"

fun EditText.creditCardNumberFormatter(afterTextChanged: (String) -> Unit) {
    var count = 0

    this.addTextChangedListener(object : TextWatcher {
        override fun beforeTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
        }

        override fun onTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
        }

        override fun afterTextChanged(editable: Editable?) {
            when {
                count <= this@creditCardNumberFormatter.text.toString().length && (this@creditCardNumberFormatter
                        .text.toString().length == 4 || this@creditCardNumberFormatter
                        .text.toString().length == 9 || this@creditCardNumberFormatter
                        .text.toString().length == 14) -> {
                    val newNumber = """${this@creditCardNumberFormatter.text}$CARD_NUMBER_SEPARATOR"""
                    this@creditCardNumberFormatter.setText(newNumber)
                    val pos = this@creditCardNumberFormatter.text.length
                    this@creditCardNumberFormatter.setSelection(pos)
                }
                count >= this@creditCardNumberFormatter.text.toString().length && (this@creditCardNumberFormatter
                        .text.toString().length == 4 || this@creditCardNumberFormatter
                        .text.toString().length == 9 || this@creditCardNumberFormatter
                        .text.toString().length == 14) -> {
                    this@creditCardNumberFormatter.setText(this@creditCardNumberFormatter.text.toString().substring(0, this@creditCardNumberFormatter.text.toString().length - 1))
                    val pos = this@creditCardNumberFormatter.text.length
                    this@creditCardNumberFormatter.setSelection(pos)
                }
            }
            count = this@creditCardNumberFormatter.text.toString().length
            afterTextChanged.invoke(this@creditCardNumberFormatter.text.toString())
        }
    })
}

fun EditText.getCreditCardNumberNotFormatted():String{
    return this.text.toString().replace(CARD_NUMBER_SEPARATOR,"")
}

fun EditText.creditCardDateFormatter(afterTextChanged: (String) -> Unit) {
    var count = 0

    this.addTextChangedListener(object : TextWatcher {
        override fun beforeTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
        }

        override fun onTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
        }

        override fun afterTextChanged(editable: Editable?) {
            when {
                count <= this@creditCardDateFormatter.text.toString().length && (this@creditCardDateFormatter.text.toString().length == 2) -> {
                    val newNumber = """${this@creditCardDateFormatter.text}$CARD_DATE_SEPARATOR"""
                    this@creditCardDateFormatter.setText(newNumber)
                    val pos = this@creditCardDateFormatter.text.length
                    this@creditCardDateFormatter.setSelection(pos)
                }
                count >= this@creditCardDateFormatter.text.toString().length && (this@creditCardDateFormatter.text.toString().length == 2) -> {
                    this@creditCardDateFormatter.setText(this@creditCardDateFormatter.text.toString().substring(0, this@creditCardDateFormatter.text.toString().length - 1))
                    val pos = this@creditCardDateFormatter.text.length
                    this@creditCardDateFormatter.setSelection(pos)
                }
            }
            count = this@creditCardDateFormatter.text.toString().length
            afterTextChanged.invoke(this@creditCardDateFormatter.text.toString())
        }
    })
}

fun EditText.getCreditCarddateNotFormatted():String{
    return this.text.toString().replace(CARD_DATE_SEPARATOR,"")
}