Add JSON parser and exporter, to allow people to more safely parse and use JSON in their OpenLayers applications.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@986 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Ajax.js

@@ -118,3 +118,104 @@ OpenLayers.addScript = function(url) {
     scriptElem.src = url;
     head.appendChild(scriptElem);
 };
+
+
+(function () {
+    var m = {
+            '\b': '\\b',
+            '\t': '\\t',
+            '\n': '\\n',
+            '\f': '\\f',
+            '\r': '\\r',
+            '"' : '\\"',
+            '\\': '\\\\'
+        },
+        s = {
+            array: function (x) {
+                var a = ['['], b, f, i, l = x.length, v;
+                for (i = 0; i < l; i += 1) {
+                    v = x[i];
+                    f = s[typeof v];
+                    if (f) {
+                        v = f(v);
+                        if (typeof v == 'string') {
+                            if (b) {
+                                a[a.length] = ',';
+                            }
+                            a[a.length] = v;
+                            b = true;
+                        }
+                    }
+                }
+                a[a.length] = ']';
+                return a.join('');
+            },
+            'boolean': function (x) {
+                return String(x);
+            },
+            'null': function (x) {
+                return "null";
+            },
+            number: function (x) {
+                return isFinite(x) ? String(x) : 'null';
+            },
+            object: function (x) {
+                if (x) {
+                    if (x instanceof Array) {
+                        return s.array(x);
+                    }
+                    var a = ['{'], b, f, i, v;
+                    for (i in x) {
+                        v = x[i];
+                        f = s[typeof v];
+                        if (f) {
+                            v = f(v);
+                            if (typeof v == 'string') {
+                                if (b) {
+                                    a[a.length] = ',';
+                                }
+                                a.push(s.string(i), ':', v);
+                                b = true;
+                            }
+                        }
+                    }
+                    a[a.length] = '}';
+                    return a.join('');
+                }
+                return 'null';
+            },
+            string: function (x) {
+                if (/["\\\x00-\x1f]/.test(x)) {
+                    x = x.replace(/([\x00-\x1f\\"])/g, function(a, b) {
+                        var c = m[b];
+                        if (c) {
+                            return c;
+                        }
+                        c = b.charCodeAt();
+                        return '\\u00' +
+                            Math.floor(c / 16).toString(16) +
+                            (c % 16).toString(16);
+                    });
+                }
+                return '"' + x + '"';
+            }
+        };
+
+    Object.prototype.toJSONString = function () {
+        return s.object(this);
+    };
+
+    Array.prototype.toJSONString = function () {
+        return s.array(this);
+    };
+})();
+
+String.prototype.parseJSON = function () {
+    try {
+        return !(/[^,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]/.test(
+                this.replace(/"(\\.|[^"\\])*"/g, ''))) &&
+            eval('(' + this + ')');
+    } catch (e) {
+        return false;
+    }
+};