2 YUI 3.13.0 (build 508226d)
3 Copyright 2013 Yahoo! Inc. All rights reserved.
4 Licensed under the BSD License.
5 http://yuilibrary.com/license/
8 YUI.add('json-stringify-shim', function (Y, NAME) {
10 // All internals kept private for security reasons
12 isFunction= Lang.isFunction,
13 isObject = Lang.isObject,
14 isArray = Lang.isArray,
15 _toStr = Object.prototype.toString,
16 UNDEFINED = 'undefined',
24 'undefined' : UNDEFINED,
26 '[object String]' : STRING,
28 '[object Number]' : NUMBER,
30 '[object Boolean]' : BOOLEAN,
31 '[object Date]' : DATE,
32 '[object RegExp]' : OBJECT
46 // Regex used to capture characters that need escaping before enclosing
47 // their containing string in quotes.
48 _SPECIAL = /[\x00-\x07\x0b\x0e-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
50 // Character substitution map for common escapes and special characters.
60 _COMMON_LENGTH = _COMMON.length,
62 // In-process optimization for special character escapes that haven't yet
63 // been promoted to _COMMON
66 // Per-char counter to determine if it's worth fast tracking a special
67 // character escape sequence.
68 _CHAR_COUNT, _CACHE_THRESHOLD;
70 // Utility function used to determine how to serialize a variable.
73 return _allowable[t] || // number, string, boolean, undefined
74 _allowable[_toStr.call(o)] || // Number, String, Boolean, Date
76 (o ? OBJECT : NULL) : // object, array, null, misc natives
77 UNDEFINED); // function, unknown
80 // Escapes a special character to a safe Unicode representation
83 _CHAR[c] = '\\u'+('0000'+(+(c.charCodeAt(0))).toString(16)).slice(-4);
87 // === to avoid this conditional for the remainder of the current operation
88 if (++_CHAR_COUNT[c] === _CACHE_THRESHOLD) {
89 _COMMON.push([new RegExp(c, 'g'), _CHAR[c]]);
90 _COMMON_LENGTH = _COMMON.length;
96 // Enclose escaped strings in quotes
100 // Preprocess the string against common characters to avoid function
101 // overhead associated with replacement via function.
102 for (i = 0; i < _COMMON_LENGTH; i++) {
104 s = s.replace(chr[0], chr[1]);
107 // original function replace for the not-as-common set of chars
108 return QUOTE + s.replace(_SPECIAL, _char) + QUOTE;
111 // Adds the provided space to the beginning of every line in the input string
112 function _indent(s,space) {
113 return s.replace(/^/gm, space);
116 Y.JSON.stringify = function _stringify(o,w,space) {
117 if (o === undefined) {
121 var replacer = isFunction(w) ? w : null,
122 format = _toStr.call(space).match(/String|Number/) || [],
123 _date = Y.JSON.dateToString,
128 _CACHE_THRESHOLD = Y.JSON.charCacheThreshold;
130 if (replacer || !isArray(w)) {
134 // Ensure whitelist keys are unique (bug 2110391)
137 for (i = 0, len = w.length; i < len; ++i) {
143 // Per the spec, strings are truncated to 10 characters and numbers
144 // are converted to that number of spaces (max 10)
145 space = format[0] === 'Number' ?
146 new Array(Math.min(Math.max(0,space),10)+1).join(" ") :
147 (space || EMPTY).slice(0,10);
149 function _serialize(h,key) {
153 colon = space ? COLON_SP : COLON,
156 // Per the ECMA 5 spec, toJSON is applied before the replacer is
157 // called. Also per the spec, Date.prototype.toJSON has been added, so
158 // Date instances should be serialized prior to exposure to the
159 // replacer. I disagree with this decision, but the spec is the spec.
160 if (isObject(value) && isFunction(value.toJSON)) {
161 value = value.toJSON(key);
162 } else if (t === DATE) {
163 value = _date(value);
166 if (isFunction(replacer)) {
167 value = replacer.call(h,key,value);
170 if (value !== h[key]) {
175 case DATE : // intentional fallthrough. Pre-replacer Dates are
176 // serialized in the toJSON stage. Dates here would
177 // have been produced by the replacer.
179 case STRING : return _string(value);
180 case NUMBER : return isFinite(value) ? value+EMPTY : NULL;
181 case BOOLEAN : return value+EMPTY;
182 case NULL : return NULL;
183 default : return undefined;
186 // Check for cyclical references in nested objects
187 for (i = stack.length - 1; i >= 0; --i) {
188 if (stack[i] === value) {
189 throw new Error("JSON.stringify. Cyclical reference");
193 arr = isArray(value);
195 // Add the object to the processing stack
199 for (i = value.length - 1; i >= 0; --i) {
200 a[i] = _serialize(value, i) || NULL;
203 // If whitelist provided, take only those keys
208 if (keys.hasOwnProperty(k)) {
209 v = _serialize(value, k);
211 a[i++] = _string(k) + colon + v;
217 // remove the array from the stack
220 if (space && a.length) {
222 OPEN_A + CR + _indent(a.join(COMMA_CR), space) + CR + CLOSE_A :
223 OPEN_O + CR + _indent(a.join(COMMA_CR), space) + CR + CLOSE_O;
226 OPEN_A + a.join(COMMA) + CLOSE_A :
227 OPEN_O + a.join(COMMA) + CLOSE_O;
232 return _serialize({'':o},'');
235 // Property available for testing if the implementation being used
236 // is native or a shim
237 Y.JSON.stringify.isShim = true;
240 }, '3.13.0', {"requires": ["json-stringify"]});