31c487438c034bed451f2522cb53c9f442b747798d19352d2a9414ba212260e5.json raw

   1  {"ast":null,"code":"const VersionCheck = require('./version-check');\nconst Regex = require('./regex');\n\n/**\n * Numeric mode encodes data from the decimal digit set (0 - 9)\n * (byte values 30HEX to 39HEX).\n * Normally, 3 data characters are represented by 10 bits.\n *\n * @type {Object}\n */\nexports.NUMERIC = {\n  id: 'Numeric',\n  bit: 1 << 0,\n  ccBits: [10, 12, 14]\n};\n\n/**\n * Alphanumeric mode encodes data from a set of 45 characters,\n * i.e. 10 numeric digits (0 - 9),\n *      26 alphabetic characters (A - Z),\n *   and 9 symbols (SP, $, %, *, +, -, ., /, :).\n * Normally, two input characters are represented by 11 bits.\n *\n * @type {Object}\n */\nexports.ALPHANUMERIC = {\n  id: 'Alphanumeric',\n  bit: 1 << 1,\n  ccBits: [9, 11, 13]\n};\n\n/**\n * In byte mode, data is encoded at 8 bits per character.\n *\n * @type {Object}\n */\nexports.BYTE = {\n  id: 'Byte',\n  bit: 1 << 2,\n  ccBits: [8, 16, 16]\n};\n\n/**\n * The Kanji mode efficiently encodes Kanji characters in accordance with\n * the Shift JIS system based on JIS X 0208.\n * The Shift JIS values are shifted from the JIS X 0208 values.\n * JIS X 0208 gives details of the shift coded representation.\n * Each two-byte character value is compacted to a 13-bit binary codeword.\n *\n * @type {Object}\n */\nexports.KANJI = {\n  id: 'Kanji',\n  bit: 1 << 3,\n  ccBits: [8, 10, 12]\n};\n\n/**\n * Mixed mode will contain a sequences of data in a combination of any of\n * the modes described above\n *\n * @type {Object}\n */\nexports.MIXED = {\n  bit: -1\n};\n\n/**\n * Returns the number of bits needed to store the data length\n * according to QR Code specifications.\n *\n * @param  {Mode}   mode    Data mode\n * @param  {Number} version QR Code version\n * @return {Number}         Number of bits\n */\nexports.getCharCountIndicator = function getCharCountIndicator(mode, version) {\n  if (!mode.ccBits) throw new Error('Invalid mode: ' + mode);\n  if (!VersionCheck.isValid(version)) {\n    throw new Error('Invalid version: ' + version);\n  }\n  if (version >= 1 && version < 10) return mode.ccBits[0];else if (version < 27) return mode.ccBits[1];\n  return mode.ccBits[2];\n};\n\n/**\n * Returns the most efficient mode to store the specified data\n *\n * @param  {String} dataStr Input data string\n * @return {Mode}           Best mode\n */\nexports.getBestModeForData = function getBestModeForData(dataStr) {\n  if (Regex.testNumeric(dataStr)) return exports.NUMERIC;else if (Regex.testAlphanumeric(dataStr)) return exports.ALPHANUMERIC;else if (Regex.testKanji(dataStr)) return exports.KANJI;else return exports.BYTE;\n};\n\n/**\n * Return mode name as string\n *\n * @param {Mode} mode Mode object\n * @returns {String}  Mode name\n */\nexports.toString = function toString(mode) {\n  if (mode && mode.id) return mode.id;\n  throw new Error('Invalid mode');\n};\n\n/**\n * Check if input param is a valid mode object\n *\n * @param   {Mode}    mode Mode object\n * @returns {Boolean} True if valid mode, false otherwise\n */\nexports.isValid = function isValid(mode) {\n  return mode && mode.bit && mode.ccBits;\n};\n\n/**\n * Get mode object from its name\n *\n * @param   {String} string Mode name\n * @returns {Mode}          Mode object\n */\nfunction fromString(string) {\n  if (typeof string !== 'string') {\n    throw new Error('Param is not a string');\n  }\n  const lcStr = string.toLowerCase();\n  switch (lcStr) {\n    case 'numeric':\n      return exports.NUMERIC;\n    case 'alphanumeric':\n      return exports.ALPHANUMERIC;\n    case 'kanji':\n      return exports.KANJI;\n    case 'byte':\n      return exports.BYTE;\n    default:\n      throw new Error('Unknown mode: ' + string);\n  }\n}\n\n/**\n * Returns mode from a value.\n * If value is not a valid mode, returns defaultValue\n *\n * @param  {Mode|String} value        Encoding mode\n * @param  {Mode}        defaultValue Fallback value\n * @return {Mode}                     Encoding mode\n */\nexports.from = function from(value, defaultValue) {\n  if (exports.isValid(value)) {\n    return value;\n  }\n  try {\n    return fromString(value);\n  } catch (e) {\n    return defaultValue;\n  }\n};","map":null,"metadata":{},"sourceType":"script","externalDependencies":[]}