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Viewing file:     error-correction-level.js (893 B)      -rw-r--r--

exports.L = { bit: 1 }
exports.M = { bit: 0 }
exports.Q = { bit: 3 }
exports.H = { bit: 2 }

function fromString (string) {
  if (typeof string !== 'string') {
    throw new Error('Param is not a string')
  }

  const lcStr = string.toLowerCase()

  switch (lcStr) {
    case 'l':
    case 'low':
      return exports.L

    case 'm':
    case 'medium':
      return exports.M

    case 'q':
    case 'quartile':
      return exports.Q

    case 'h':
    case 'high':
      return exports.H

    default:
      throw new Error('Unknown EC Level: ' + string)
  }
}

exports.isValid = function isValid (level) {
  return level && typeof level.bit !== 'undefined' &&
    level.bit >= 0 && level.bit < 4
}

exports.from = function from (value, defaultValue) {
  if (exports.isValid(value)) {
    return value
  }

  try {
    return fromString(value)
  } catch (e) {
    return defaultValue
  }
}