/*

 Copyright (c) 2005 JSON.org

 Copyright (c) 2005, 2006 tonyg@kcbbs.gen.nz

 Permission is hereby granted, free of charge, to any person obtaining a copy

 of this software and associated documentation files (the "Software"), to deal

 in the Software without restriction, including without limitation the rights

 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 copies of the Software, and to permit persons to whom the Software is

 furnished to do so, subject to the following conditions:

 The Software shall be used for Good, not Evil.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

 SOFTWARE.

 CHANGELOG

 =========

  - September 2005: changes by tonyg@kcbbs.gen.nz for constructors and

    customisable serialisation

  - 23 June 2006: changes by tonyg@kcbbs.gen.nz for Rhino JS support

  - 24 June 2006: changes by tonyg@kcbbs.gen.nz for better array-detection

  - 8 November 2006: tonyg: conditionalise Java-specific code

 */

 var JSON = {

     org: 'http://www.JSON.org',

     copyright: '(c)2005 JSON.org',

     license: 'http://www.crockford.com/JSON/license.html',

     javaSerializers: {

 	"java.lang.Object": function (arg) { return JSON.stringify(String(arg)); }

     },

     rhinoSupport: false, /* set to true to enable Java JSON serialization */

     isJavaObject: function (o) {

 	if (this.rhinoSupport) {

 	    if (o instanceof java.lang.Object) {

 		return true;

 	    }

 	}

 	return false;

     },

     findJavaSerializer: function (o) {

 	var c = o.getClass();

 	while (c != null) {

 	    if (typeof this.javaSerializers[c.getName()] != 'undefined') {

 		return this.javaSerializers[c.getName()];

 	    }

 	    var interfaces = c.getInterfaces();

 	    for (var i = 0; i < interfaces.length; i++) {

 		if (typeof this.javaSerializers[interfaces[i].getName()] != 'undefined') {

 		    return this.javaSerializers[interfaces[i].getName()];

 		}

 	    }

 	    c = c.getSuperclass();

 	}

 	return null;

     },

     stringify: function (arg) {

         var c, i, l, s = '', v;

         switch (typeof arg) {

         case 'object':

             if (arg) {

                 if (arg instanceof Array) {

                     for (i = 0; i < arg.length; ++i) {

                         v = this.stringify(arg[i]);

                         if (s) {

                             s += ',';

                         }

                         s += v;

                     }

                     return '[' + s + ']';

 		} else if (typeof arg.toJsonString != 'undefined') {

 		    return arg.toJsonString();

 		} else if (this.isJavaObject(arg)) {

 		    v = this.findJavaSerializer(arg);

 		    if (v != null) {

 			return v(arg);

 		    }

                 } else if (typeof arg.toString != 'undefined') {

                     for (i in arg) {

                         v = arg[i];

                         if (typeof v != 'undefined' && typeof v != 'function') {

                             v = this.stringify(v);

                             if (s) {

                                 s += ',';

                             }

                             s += this.stringify(i) + ':' + v;

                         }

                     }

                     return '{' + s + '}';

                 }

             }

             return 'null';

         case 'number':

             return isFinite(arg) ? String(arg) : 'null';

         case 'string':

             l = arg.length;

             s = '"';

             for (i = 0; i < l; i += 1) {

                 c = arg.charAt(i);

                 if (c >= ' ') {

                     if (c == '\\' || c == '"') {

                         s += '\\';

                     }

                     s += c;

                 } else {

                     switch (c) {

                         case '\b':

                             s += '\\b';

                             break;

                         case '\f':

                             s += '\\f';

                             break;

                         case '\n':

                             s += '\\n';

                             break;

                         case '\r':

                             s += '\\r';

                             break;

                         case '\t':

                             s += '\\t';

                             break;

                         default:

                             c = c.charCodeAt();

                             s += '\\u00' + Math.floor(c / 16).toString(16) +

                                 (c % 16).toString(16);

                     }

                 }

             }

             return s + '"';

         case 'boolean':

             return String(arg);

         default:

             return 'null';

         }

     },

     parse: function (text, ctors) {

         var at = 0;

         var ch = ' ';

         function error(m) {

             throw {

                 name: 'JSONError',

                 message: m,

                 at: at - 1,

                 text: text

             };

         }

         function next() {

             ch = text.charAt(at);

             at += 1;

             return ch;

         }

         function white() {

             while (ch != '' && ch <= ' ') {

                 next();

             }

         }

         function str() {

             var i, s = '', t, u;

             if (ch == '"') {

 outer:          while (next()) {

                     if (ch == '"') {

                         next();

                         return s;

                     } else if (ch == '\\') {

                         switch (next()) {

                         case 'b':

                             s += '\b';

                             break;

                         case 'f':

                             s += '\f';

                             break;

                         case 'n':

                             s += '\n';

                             break;

                         case 'r':

                             s += '\r';

                             break;

                         case 't':

                             s += '\t';

                             break;

                         case 'u':

                             u = 0;

                             for (i = 0; i < 4; i += 1) {

                                 t = parseInt(next(), 16);

                                 if (!isFinite(t)) {

                                     break outer;

                                 }

                                 u = u * 16 + t;

                             }

                             s += String.fromCharCode(u);

                             break;

                         default:

                             s += ch;

                         }

                     } else {

                         s += ch;

                     }

                 }

             }

             error("Bad string");

         }

         function arr() {

             var a = [];

             if (ch == '[') {

                 next();

                 white();

                 if (ch == ']') {

                     next();

                     return a;

                 }

                 while (ch) {

                     a.push(val());

                     white();

                     if (ch == ']') {

                         next();

                         return a;

                     } else if (ch != ',') {

                         break;

                     }

                     next();

                     white();

                 }

             }

             error("Bad array");

         }

         function obj() {

             var k, o = {};

             if (ch == '{') {

                 next();

                 white();

                 if (ch == '}') {

                     next();

                     return o;

                 }

                 while (ch) {

                     k = str();

                     white();

                     if (ch != ':') {

                         break;

                     }

                     next();

                     o[k] = val();

                     white();

                     if (ch == '}') {

                         next();

                         return o;

                     } else if (ch != ',') {

                         break;

                     }

                     next();

                     white();

                 }

             }

             error("Bad object");

         }

         function num() {

             var n = '', v;

             if (ch == '-') {

                 n = '-';

                 next();

             }

             while (ch >= '0' && ch <= '9') {

                 n += ch;

                 next();

             }

             if (ch == '.') {

                 n += '.';

                 while (next() && ch >= '0' && ch <= '9') {

                     n += ch;

                 }

             }

             if (ch == 'e' || ch == 'E') {

                 n += 'e';

                 next();

                 if (ch == '-' || ch == '+') {

                     n += ch;

                     next();

                 }

                 while (ch >= '0' && ch <= '9') {

                     n += ch;

                     next();

                 }

             }

             v = +n;

             if (!isFinite(v)) {

                 error("Bad number");

             } else {

                 return v;

             }

         }

         function word() {

             switch (ch) {

                 case 't':

                     if (next() == 'r' && next() == 'u' && next() == 'e') {

                         next();

                         return true;

                     }

                     break;

                 case 'f':

                     if (next() == 'a' && next() == 'l' && next() == 's' &&

                             next() == 'e') {

                         next();

                         return false;

                     }

                     break;

                 case 'n':

                     if (next() == 'u' && next() == 'l' && next() == 'l') {

                         next();

                         return null;

                     }

                     break;

             }

             error("Syntax error");

         }

 	function ctor() {

 	    var name = '';

 	    if (ch == '@') {

 		next();

 		while (ch == '.' || (ch.toUpperCase() >= 'A' &&

 				     ch.toUpperCase() <= 'Z')) {

 		    name += ch;

 		    next();

 		}

 		var arg = val();

 		if (name in ctors) {

 		    return ctors[name](arg);

 		} else {

 		    error("Unknown ctor " + name);

 		}

 	    }

 	    error("Bad ctor");

 	}

         function val() {

             white();

             switch (ch) {

 	        case '@':

 		    return ctor();

                 case '{':

                     return obj();

                 case '[':

                     return arr();

                 case '"':

                     return str();

                 case '-':

                     return num();

                 default:

                     return ch >= '0' && ch <= '9' ? num() : word();

             }

         }

         return val();

     }

 };