cnf-qrcode/src/lib/core/error-correction-level.js

generate qrcode,support svg base64 utf8

export const L = { bit: 1 };
export const M = { bit: 0 };
export const Q = { bit: 3 };
export const 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 L;

  case 'm':
  case 'medium':
    return M;

  case 'q':
  case 'quartile':
    return Q;

  case 'h':
  case 'high':
    return H;

  default:
    throw new Error(`Unknown EC Level: ${string}`);
  }
}

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

function from(value, defaultValue) {
  if (isValid(value)) {
    return value;
  }

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

export { from };