513 lines
14 KiB
JavaScript
513 lines
14 KiB
JavaScript
/*! http://mths.be/punycode by @mathias */
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;(function(root) {
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/**
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* The `punycode` object.
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* @name punycode
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* @type Object
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*/
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var punycode,
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/** Detect free variables `define`, `exports`, `module` and `require` */
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freeDefine = typeof define == 'function' && typeof define.amd == 'object' &&
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define.amd && define,
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freeExports = typeof exports == 'object' && exports,
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freeModule = typeof module == 'object' && module,
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// freeRequire = typeof require == 'function' && require,
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/** Highest positive signed 32-bit float value */
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maxInt = 2147483647, // aka. 0x7FFFFFFF or 2^31-1
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/** Bootstring parameters */
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base = 36,
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tMin = 1,
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tMax = 26,
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skew = 38,
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damp = 700,
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initialBias = 72,
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initialN = 128, // 0x80
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delimiter = '-', // '\x2D'
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/** Regular expressions */
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regexNonASCII = /[^ -~]/, // unprintable ASCII chars + non-ASCII chars
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regexPunycode = /^xn--/,
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/** Error messages */
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errors = {
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'overflow': 'Overflow: input needs wider integers to process.',
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'ucs2decode': 'UCS-2(decode): illegal sequence',
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'ucs2encode': 'UCS-2(encode): illegal value',
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'not-basic': 'Illegal input >= 0x80 (not a basic code point)',
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'invalid-input': 'Invalid input'
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},
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/** Convenience shortcuts */
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baseMinusTMin = base - tMin,
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floor = Math.floor,
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stringFromCharCode = String.fromCharCode,
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/** Temporary variable */
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key;
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/*--------------------------------------------------------------------------*/
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/**
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* A generic error utility function.
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* @private
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* @param {String} type The error type.
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* @returns {Error} Throws a `RangeError` with the applicable error message.
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*/
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function error(type) {
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throw RangeError(errors[type]);
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}
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/**
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* A generic `Array#map` utility function.
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* @private
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* @param {Array} array The array to iterate over.
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* @param {Function} callback The function that gets called for every array
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* item.
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* @returns {Array} A new array of values returned by the callback function.
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*/
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function map(array, fn) {
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var length = array.length;
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while (length--) {
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array[length] = fn(array[length]);
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}
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return array;
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}
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/**
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* A simple `Array#map`-like wrapper to work with domain name strings.
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* @private
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* @param {String} domain The domain name.
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* @param {Function} callback The function that gets called for every
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* character.
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* @returns {Array} A new string of characters returned by the callback
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* function.
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*/
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function mapDomain(string, fn) {
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var glue = '.';
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return map(string.split(glue), fn).join(glue);
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}
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/**
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* Creates an array containing the decimal code points of each Unicode
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* character in the string. While JavaScript uses UCS-2 internally,
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* this function will convert a pair of surrogate halves (each of which
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* UCS-2 exposes as separate characters) into a single code point,
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* matching UTF-16.
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* @see `punycode.ucs2.encode`
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* @see <http://mathiasbynens.be/notes/javascript-encoding>
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* @memberOf punycode.ucs2
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* @name decode
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* @param {String} string The Unicode input string (UCS-2).
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* @returns {Array} The new array of code points.
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*/
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function ucs2decode(string) {
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var output = [],
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counter = 0,
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length = string.length,
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value,
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extra;
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while (counter < length) {
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value = string.charCodeAt(counter++);
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if ((value & 0xF800) == 0xD800) {
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extra = string.charCodeAt(counter++);
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if ((value & 0xFC00) != 0xD800 || (extra & 0xFC00) != 0xDC00) {
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error('ucs2decode');
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}
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value = ((value & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000;
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}
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output.push(value);
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}
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return output;
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}
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/**
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* Creates a string based on an array of decimal code points.
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* @see `punycode.ucs2.decode`
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* @memberOf punycode.ucs2
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* @name encode
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* @param {Array} codePoints The array of decimal code points.
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* @returns {String} The new Unicode string (UCS-2).
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*/
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function ucs2encode(array) {
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return map(array, function(value) {
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var output = '';
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if ((value & 0xF800) == 0xD800) {
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error('ucs2encode');
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}
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if (value > 0xFFFF) {
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value -= 0x10000;
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output += stringFromCharCode(value >>> 10 & 0x3FF | 0xD800);
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value = 0xDC00 | value & 0x3FF;
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}
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output += stringFromCharCode(value);
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return output;
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}).join('');
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}
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/**
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* Converts a basic code point into a digit/integer.
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* @see `digitToBasic()`
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* @private
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* @param {Number} codePoint The basic (decimal) code point.
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* @returns {Number} The numeric value of a basic code point (for use in
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* representing integers) in the range `0` to `base - 1`, or `base` if
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* the code point does not represent a value.
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*/
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function basicToDigit(codePoint) {
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return codePoint - 48 < 10
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? codePoint - 22
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: codePoint - 65 < 26
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? codePoint - 65
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: codePoint - 97 < 26
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? codePoint - 97
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: base;
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}
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/**
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* Converts a digit/integer into a basic code point.
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* @see `basicToDigit()`
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* @private
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* @param {Number} digit The numeric value of a basic code point.
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* @returns {Number} The basic code point whose value (when used for
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* representing integers) is `digit`, which needs to be in the range
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* `0` to `base - 1`. If `flag` is non-zero, the uppercase form is
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* used; else, the lowercase form is used. The behavior is undefined
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* if flag is non-zero and `digit` has no uppercase form.
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*/
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function digitToBasic(digit, flag) {
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// 0..25 map to ASCII a..z or A..Z
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// 26..35 map to ASCII 0..9
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return digit + 22 + 75 * (digit < 26) - ((flag != 0) << 5);
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}
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/**
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* Bias adaptation function as per section 3.4 of RFC 3492.
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* http://tools.ietf.org/html/rfc3492#section-3.4
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* @private
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*/
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function adapt(delta, numPoints, firstTime) {
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var k = 0;
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delta = firstTime ? floor(delta / damp) : delta >> 1;
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delta += floor(delta / numPoints);
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for (/* no initialization */; delta > baseMinusTMin * tMax >> 1; k += base) {
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delta = floor(delta / baseMinusTMin);
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}
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return floor(k + (baseMinusTMin + 1) * delta / (delta + skew));
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}
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/**
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* Converts a basic code point to lowercase is `flag` is falsy, or to
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* uppercase if `flag` is truthy. The code point is unchanged if it's
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* caseless. The behavior is undefined if `codePoint` is not a basic code
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* point.
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* @private
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* @param {Number} codePoint The numeric value of a basic code point.
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* @returns {Number} The resulting basic code point.
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*/
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function encodeBasic(codePoint, flag) {
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codePoint -= (codePoint - 97 < 26) << 5;
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return codePoint + (!flag && codePoint - 65 < 26) << 5;
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}
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/**
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* Converts a Punycode string of ASCII code points to a string of Unicode
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* code points.
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* @memberOf punycode
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* @param {String} input The Punycode string of ASCII code points.
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* @returns {String} The resulting string of Unicode code points.
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*/
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function decode(input) {
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// Don't use UCS-2
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var output = [],
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inputLength = input.length,
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out,
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i = 0,
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n = initialN,
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bias = initialBias,
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basic,
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j,
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index,
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oldi,
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w,
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k,
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digit,
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t,
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length,
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/** Cached calculation results */
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baseMinusT;
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// Handle the basic code points: let `basic` be the number of input code
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// points before the last delimiter, or `0` if there is none, then copy
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// the first basic code points to the output.
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basic = input.lastIndexOf(delimiter);
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if (basic < 0) {
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basic = 0;
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}
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for (j = 0; j < basic; ++j) {
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// if it's not a basic code point
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if (input.charCodeAt(j) >= 0x80) {
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error('not-basic');
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}
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output.push(input.charCodeAt(j));
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}
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// Main decoding loop: start just after the last delimiter if any basic code
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// points were copied; start at the beginning otherwise.
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for (index = basic > 0 ? basic + 1 : 0; index < inputLength; /* no final expression */) {
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// `index` is the index of the next character to be consumed.
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// Decode a generalized variable-length integer into `delta`,
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// which gets added to `i`. The overflow checking is easier
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// if we increase `i` as we go, then subtract off its starting
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// value at the end to obtain `delta`.
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for (oldi = i, w = 1, k = base; /* no condition */; k += base) {
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if (index >= inputLength) {
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error('invalid-input');
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}
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digit = basicToDigit(input.charCodeAt(index++));
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if (digit >= base || digit > floor((maxInt - i) / w)) {
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error('overflow');
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}
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i += digit * w;
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t = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);
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if (digit < t) {
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break;
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}
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baseMinusT = base - t;
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if (w > floor(maxInt / baseMinusT)) {
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error('overflow');
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}
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w *= baseMinusT;
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}
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out = output.length + 1;
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bias = adapt(i - oldi, out, oldi == 0);
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// `i` was supposed to wrap around from `out` to `0`,
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// incrementing `n` each time, so we'll fix that now:
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if (floor(i / out) > maxInt - n) {
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error('overflow');
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}
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n += floor(i / out);
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i %= out;
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// Insert `n` at position `i` of the output
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output.splice(i++, 0, n);
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}
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return ucs2encode(output);
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}
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/**
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* Converts a string of Unicode code points to a Punycode string of ASCII
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* code points.
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* @memberOf punycode
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* @param {String} input The string of Unicode code points.
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* @returns {String} The resulting Punycode string of ASCII code points.
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*/
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function encode(input) {
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var n,
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delta,
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handledCPCount,
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basicLength,
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bias,
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j,
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m,
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q,
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k,
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t,
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currentValue,
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output = [],
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/** `inputLength` will hold the number of code points in `input`. */
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inputLength,
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/** Cached calculation results */
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handledCPCountPlusOne,
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baseMinusT,
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qMinusT;
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// Convert the input in UCS-2 to Unicode
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input = ucs2decode(input);
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// Cache the length
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inputLength = input.length;
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// Initialize the state
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n = initialN;
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delta = 0;
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bias = initialBias;
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// Handle the basic code points
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for (j = 0; j < inputLength; ++j) {
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currentValue = input[j];
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if (currentValue < 0x80) {
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output.push(stringFromCharCode(currentValue));
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}
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}
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handledCPCount = basicLength = output.length;
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// `handledCPCount` is the number of code points that have been handled;
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// `basicLength` is the number of basic code points.
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// Finish the basic string - if it is not empty - with a delimiter
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if (basicLength) {
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output.push(delimiter);
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}
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// Main encoding loop:
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while (handledCPCount < inputLength) {
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// All non-basic code points < n have been handled already. Find the next
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// larger one:
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for (m = maxInt, j = 0; j < inputLength; ++j) {
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currentValue = input[j];
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if (currentValue >= n && currentValue < m) {
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m = currentValue;
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}
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}
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// Increase `delta` enough to advance the decoder's <n,i> state to <m,0>,
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// but guard against overflow
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handledCPCountPlusOne = handledCPCount + 1;
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if (m - n > floor((maxInt - delta) / handledCPCountPlusOne)) {
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error('overflow');
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}
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delta += (m - n) * handledCPCountPlusOne;
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n = m;
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for (j = 0; j < inputLength; ++j) {
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currentValue = input[j];
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if (currentValue < n && ++delta > maxInt) {
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error('overflow');
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}
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if (currentValue == n) {
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// Represent delta as a generalized variable-length integer
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for (q = delta, k = base; /* no condition */; k += base) {
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t = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);
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if (q < t) {
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break;
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}
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qMinusT = q - t;
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baseMinusT = base - t;
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output.push(
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stringFromCharCode(digitToBasic(t + qMinusT % baseMinusT, 0))
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);
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q = floor(qMinusT / baseMinusT);
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}
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output.push(stringFromCharCode(digitToBasic(q, 0)));
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bias = adapt(delta, handledCPCountPlusOne, handledCPCount == basicLength);
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delta = 0;
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++handledCPCount;
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}
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}
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++delta;
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++n;
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}
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return output.join('');
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}
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/**
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* Converts a Punycode string representing a domain name to Unicode. Only the
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* Punycoded parts of the domain name will be converted, i.e. it doesn't
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* matter if you call it on a string that has already been converted to
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* Unicode.
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* @memberOf punycode
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* @param {String} domain The Punycode domain name to convert to Unicode.
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* @returns {String} The Unicode representation of the given Punycode
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* string.
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*/
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function toUnicode(domain) {
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return mapDomain(domain, function(string) {
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return regexPunycode.test(string)
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? decode(string.slice(4).toLowerCase())
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: string;
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});
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}
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/**
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* Converts a Unicode string representing a domain name to Punycode. Only the
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* non-ASCII parts of the domain name will be converted, i.e. it doesn't
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* matter if you call it with a domain that's already in ASCII.
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* @memberOf punycode
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* @param {String} domain The domain name to convert, as a Unicode string.
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* @returns {String} The Punycode representation of the given domain name.
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*/
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function toASCII(domain) {
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return mapDomain(domain, function(string) {
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return regexNonASCII.test(string)
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? 'xn--' + encode(string)
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: string;
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});
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}
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/*--------------------------------------------------------------------------*/
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/** Define the public API */
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punycode = {
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/**
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* A string representing the current Punycode.js version number.
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* @memberOf punycode
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* @type String
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*/
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'version': '1.0.0',
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/**
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* An object of methods to convert from JavaScript's internal character
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* representation (UCS-2) to decimal Unicode code points, and back.
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* @see <http://mathiasbynens.be/notes/javascript-encoding>
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* @memberOf punycode
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* @type Object
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*/
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'ucs2': {
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'decode': ucs2decode,
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'encode': ucs2encode
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},
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'decode': decode,
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'encode': encode,
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'toASCII': toASCII,
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'toUnicode': toUnicode
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};
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/** Expose `punycode` */
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if (freeExports) {
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if (freeModule && freeModule.exports == freeExports) {
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// in Node.js or Ringo 0.8+
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freeModule.exports = punycode;
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} else {
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// in Narwhal or Ringo 0.7-
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for (key in punycode) {
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punycode.hasOwnProperty(key) && (freeExports[key] = punycode[key]);
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}
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}
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} else if (freeDefine) {
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// via curl.js or RequireJS
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define('punycode', punycode);
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} else {
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// in a browser or Rhino
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root.punycode = punycode;
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}
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}(this));
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