118 lines
3.5 KiB
JavaScript
118 lines
3.5 KiB
JavaScript
/*
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json.js
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2006-04-28
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This file adds these methods to JavaScript:
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object.toJSONString()
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This method produces a JSON text from an object. The
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object must not contain any cyclical references.
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array.toJSONString()
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This method produces a JSON text from an array. The
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array must not contain any cyclical references.
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string.parseJSON()
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This method parses a JSON text to produce an object or
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array. It will return false if there is an error.
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*/
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(function () {
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var m = {
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'\b': '\\b',
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'\t': '\\t',
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'\n': '\\n',
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'\f': '\\f',
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'\r': '\\r',
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'"' : '\\"',
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'\\': '\\\\'
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},
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s = {
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array: function (x) {
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var a = ['['], b, f, i, l = x.length, v;
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for (i = 0; i < l; i += 1) {
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v = x[i];
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f = s[typeof v];
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if (f) {
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v = f(v);
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if (typeof v == 'string') {
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if (b) {
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a[a.length] = ',';
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}
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a[a.length] = v;
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b = true;
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}
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}
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}
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a[a.length] = ']';
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return a.join('');
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},
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'boolean': function (x) {
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return String(x);
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},
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'null': function (x) {
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return "null";
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},
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number: function (x) {
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return isFinite(x) ? String(x) : 'null';
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},
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object: function (x) {
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if (x) {
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if (x instanceof Array) {
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return s.array(x);
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}
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var a = ['{'], b, f, i, v;
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for (i in x) {
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v = x[i];
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f = s[typeof v];
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if (f) {
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v = f(v);
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if (typeof v == 'string') {
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if (b) {
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a[a.length] = ',';
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}
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a.push(s.string(i), ':', v);
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b = true;
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}
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}
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}
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a[a.length] = '}';
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return a.join('');
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}
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return 'null';
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},
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string: function (x) {
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if (/["\\\x00-\x1f]/.test(x)) {
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x = x.replace(/([\x00-\x1f\\"])/g, function(a, b) {
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var c = m[b];
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if (c) {
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return c;
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}
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c = b.charCodeAt();
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return '\\u00' +
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Math.floor(c / 16).toString(16) +
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(c % 16).toString(16);
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});
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}
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return '"' + x + '"';
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}
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};
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Object.toJSON = function(obj) {
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return s.object(obj);
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};
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})();
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String.prototype.parseJSON = function () {
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try {
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return !(/[^,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]/.test(
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this.replace(/"(\\.|[^"\\])*"/g, ''))) &&
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eval('(' + this + ')');
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} catch (e) {
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return false;
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}
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};
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