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// Useful telnet key detection.
const compareBufStr = (buf, str) => {
return buf.equals(Buffer.from(str.split('').map(c => c.charCodeAt(0))))
}
const telchars = {
isSpace: buf => buf[0] === 0x20,
isEnter: buf => buf[0] === 0x0d,
isTab: buf => buf[0] === 0x09,
isBackTab: buf => buf[0] === 0x1b && buf[2] === 0x5A,
isBackspace: buf => buf[0] === 0x7F,
// isEscape is hard because it's just send as ESC (the ANSI escape code),
// so we need to make sure that the escape code is all on its own
// (i.e. the length is 1)
isEscape: buf => buf[0] === 0x1b && buf.length === 1,
// Use this for when you'd like to detect the user confirming or issuing a
// command, like the X button on your PlayStation controller, or the mouse
// when you click on a button.
isSelect: buf => telchars.isSpace(buf) || telchars.isEnter(buf),
// Use this for when you'd like to detect the user cancelling an action,
// like the O button on your PlayStation controller, or the Escape key on
// your keyboard.
isCancel: buf => telchars.isEscape(buf),
isUp: buf => buf[0] === 0x1b && buf[2] === 0x41,
isDown: buf => buf[0] === 0x1b && buf[2] === 0x42,
isRight: buf => buf[0] === 0x1b && buf[2] === 0x43,
isLeft: buf => buf[0] === 0x1b && buf[2] === 0x44,
isShiftUp: buf => buf[0] === 0x1b && compareBufStr(buf.slice(1), '[1;2A'),
isShiftDown: buf => buf[0] === 0x1b && compareBufStr(buf.slice(1), '[1;2B'),
isShiftRight: buf => buf[0] === 0x1b && compareBufStr(buf.slice(1), '[1;2C'),
isShiftLeft: buf => buf[0] === 0x1b && compareBufStr(buf.slice(1), '[1;2D'),
isCaselessLetter: (buf, letter) => compareBufStr(buf, letter.toLowerCase()) || compareBufStr(buf, letter.toUpperCase()),
}
module.exports = telchars
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