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Viewing file:     terminal-small.js (2.34 KB)      -rw-r--r--

const backgroundWhite = '\x1b[47m'
const backgroundBlack = '\x1b[40m'
const foregroundWhite = '\x1b[37m'
const foregroundBlack = '\x1b[30m'
const reset = '\x1b[0m'
const lineSetupNormal = backgroundWhite + foregroundBlack // setup colors
const lineSetupInverse = backgroundBlack + foregroundWhite // setup colors

const createPalette = function (lineSetup, foregroundWhite, foregroundBlack) {
  return {
    // 1 ... white, 2 ... black, 0 ... transparent (default)

    '00': reset + ' ' + lineSetup,
    '01': reset + foregroundWhite + '▄' + lineSetup,
    '02': reset + foregroundBlack + '▄' + lineSetup,
    10: reset + foregroundWhite + '▀' + lineSetup,
    11: ' ',
    12: '▄',
    20: reset + foregroundBlack + '▀' + lineSetup,
    21: '▀',
    22: '█'
  }
}

/**
 * Returns code for QR pixel
 * @param {boolean[][]} modules
 * @param {number} size
 * @param {number} x
 * @param {number} y
 * @return {'0' | '1' | '2'}
 */
const mkCodePixel = function (modules, size, x, y) {
  const sizePlus = size + 1
  if ((x >= sizePlus) || (y >= sizePlus) || (y < -1) || (x < -1)) return '0'
  if ((x >= size) || (y >= size) || (y < 0) || (x < 0)) return '1'
  const idx = (y * size) + x
  return modules[idx] ? '2' : '1'
}

/**
 * Returns code for four QR pixels. Suitable as key in palette.
 * @param {boolean[][]} modules
 * @param {number} size
 * @param {number} x
 * @param {number} y
 * @return {keyof palette}
 */
const mkCode = function (modules, size, x, y) {
  return (
    mkCodePixel(modules, size, x, y) +
    mkCodePixel(modules, size, x, y + 1)
  )
}

exports.render = function (qrData, options, cb) {
  const size = qrData.modules.size
  const data = qrData.modules.data

  const inverse = !!(options && options.inverse)
  const lineSetup = options && options.inverse ? lineSetupInverse : lineSetupNormal
  const white = inverse ? foregroundBlack : foregroundWhite
  const black = inverse ? foregroundWhite : foregroundBlack

  const palette = createPalette(lineSetup, white, black)
  const newLine = reset + '\n' + lineSetup

  let output = lineSetup // setup colors

  for (let y = -1; y < size + 1; y += 2) {
    for (let x = -1; x < size; x++) {
      output += palette[mkCode(data, size, x, y)]
    }

    output += palette[mkCode(data, size, size, y)] + newLine
  }

  output += reset

  if (typeof cb === 'function') {
    cb(null, output)
  }

  return output
}