json-stringify-debug.js revision e98c881d5075aeee5eaaecb155d7a70c3035b300
/**
* Provides Y.JSON.stringify method for converting objects to JSON strings.
* @module json
* @submodule json-stringify
* @for JSON
* @static
*/
STRING = 'string',
NUMBER = 'number',
BOOLEAN = 'boolean',
OBJECT = 'object',
ARRAY = 'array',
REGEXP = 'regexp',
ERROR = 'error',
NULL = 'null',
DATE = 'date',
EMPTY = '',
OPEN_O = '{',
CLOSE_O = '}',
OPEN_A = '[',
CLOSE_A = ']',
COMMA = ',',
COMMA_CR = ",\n",
CR = "\n",
COLON = ':',
QUOTE = '"';
/**
* Regex used to capture characters that need escaping before enclosing
* their containing string in quotes.
* @property _SPECIAL_CHARS
* @type {RegExp}
* @private
*/
_SPECIAL_CHARS : /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
/**
* Character substitution map for common escapes and special characters.
* @property _CHARS
* @type {Object}
* @static
* @private
*/
_CHARS : {
'\b': '\\b',
'\t': '\\t',
'\n': '\\n',
'\f': '\\f',
'\r': '\\r',
'"' : '\\"',
'\\': '\\\\'
},
/**
* Serializes a Date instance as a UTC date string. Used internally by
* stringify. Override this method if you need Dates serialized in a
* different format.
* @method dateToString
* @param d {Date} The Date to serialize
* @return {String} stringified Date in UTC format YYYY-MM-DDTHH:mm:SSZ
* @static
*/
dateToString : function (d) {
function _zeroPad(v) {
return v < 10 ? '0' + v : v;
}
return QUOTE + d.getUTCFullYear() + '-' +
_zeroPad(d.getUTCMonth() + 1) + '-' +
_zeroPad(d.getUTCDate()) + 'T' +
_zeroPad(d.getUTCHours()) + COLON +
_zeroPad(d.getUTCMinutes()) + COLON +
_zeroPad(d.getUTCSeconds()) + 'Z' + QUOTE;
},
/**
* Converts an arbitrary value to a JSON string representation.
* Cyclical object or array references are replaced with null.
* If a whitelist is provided, only matching object keys will be included.
* If a positive integer or non-empty string is passed as the third
* parameter, the output will be formatted with carriage returns and
* indentation for readability. If a String is passed (such as "\t") it
* will be used once for each indentation level. If a number is passed,
* that number of spaces will be used.
* @method stringify
* @param o {MIXED} any arbitrary object to convert to JSON string
* @param w {Array|Function} (optional) whitelist of acceptable object
* keys to include, or a replacer function to modify the
* raw value before serialization
* @param ind {Number|String} (optional) indentation character or depth of
* spaces to format the output.
* @return {string} JSON string representation of the input
* @static
* @public
*/
stringify : function (o,w,ind) {
var m = Y.JSON._CHARS,
str_re = Y.JSON._SPECIAL_CHARS,
rep = Y.Lang.isFunction(w) ? w : null,
pstack = [], // Processing stack used for cyclical ref protection
_date = Y.JSON.dateToString; // Use configured date serialization
if (rep || typeof w !== 'object') {
w = undefined;
}
if (ind) {
ind = Y.Lang.isNumber(ind) ? new Array(ind+1).join(" ") :
Y.Lang.isString(ind) ? ind :
null;
}
// escape encode special characters
function _char(c) {
if (!m[c]) {
m[c]='\\u'+('0000'+(+(c.charCodeAt(0))).toString(16)).slice(-4);
}
return m[c];
}
// Enclose the escaped string in double quotes
function _string(s) {
return QUOTE + s.replace(str_re, _char) + QUOTE;
}
// Check for cyclical references
function _cyclicalTest(o) {
for (var i = pstack.length - 1; i >= 0; --i) {
if (pstack[i] === o) {
}
}
return false;
}
function _indent(s) {
return s.replace(/^/gm,ind);
}
function _object(o,arr) {
// Add the object to the processing stack
pstack.push(o);
var a = [], i, j, len, k, v;
if (arr) { // Array
for (i = o.length - 1; i >= 0; --i) {
a[i] = _stringify(o,i) || NULL;
}
} else { // Object
// If whitelist provided, take only those keys
k = Y.Lang.isArray(w) ? w : Y.Object.keys(w || o);
for (i = 0, j = 0, len = k.length; i < len; ++i) {
if (typeof k[i] === STRING) {
v = _stringify(o,k[i]);
if (v) {
a[j++] = _string(k[i]) + COLON + v;
}
}
}
}
// remove the array from the stack
pstack.pop();
if (ind) {
return arr ?
OPEN_A + CR + _indent(a.join(COMMA_CR)) + CR + CLOSE_A :
OPEN_O + CR + _indent(a.join(COMMA_CR)) + CR + CLOSE_O;
} else {
return arr ?
OPEN_A + a.join(COMMA) + CLOSE_A :
OPEN_O + a.join(COMMA) + CLOSE_O;
}
}
// Worker function. Fork behavior on data type and recurse objects.
function _stringify(h,key) {
var o = Y.Lang.isFunction(rep) ? rep.call(h,key,h[key]) : h[key],
t = Y.Lang.type(o);
if (t === OBJECT) {
if (/String|Number|Boolean/.test(_toString.call(o))) {
o = o.valueOf();
t = Y.Lang.type(o);
}
}
switch (t) {
case STRING : return _string(o);
case NUMBER : return isFinite(o) ? o+EMPTY : NULL;
case BOOLEAN : return o+EMPTY;
case DATE : return _date(o);
case NULL : return NULL;
case ARRAY : _cyclicalTest(o); return _object(o,true);
case REGEXP : // intentional fall through
case ERROR : // intentional fall through
case OBJECT : _cyclicalTest(o); return _object(o);
default : return undefined;
}
}
// process the input
return _stringify({'':o},EMPTY);
}
});
}, '@VERSION@' );