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<%
/*
* Copyright:
* (C) 2006 by Derrell Lipman
* All rights reserved
*
* License:
* LGPL 2.1: http://creativecommons.org/licenses/LGPL/2.1/
*/
/*
* This module provides a JSON encoder.
*/
/* escape a string as required by json */
function _escape(s)
{
var i;
var arr = new Array();
for (i = 0; i < strlen(s); i++)
{
var c = substr(s, i, 1);
if (c == '\x00')
{
arr[i] = '\\u0000';
}
if (Json._internal.convert[c] != undefined)
{
arr[i] = Json._internal.convert[c];
}
else
{
arr[i] = c;
}
}
return join("", arr);
}
/* encode an arbitrary object. called recursively, for object and array */
function _encode(o)
{
var type = nativeTypeOf(o);
if (type == "undefined")
{
return "null"; /* you really shouldn't count on this! */
}
else if (type == "null")
{
return "null";
}
else if (type == "boolean")
{
if (o)
{
return "true";
}
else
{
return "false";
}
}
else if (type == "c_function" ||
type == "js_function" ||
type == "string_c_function")
{
/* no output */
}
else if (type == "float" ||
type == "integer" ||
type == "integer64" ||
type == "pointer")
{
return (o + 0);
}
else if (type == "object")
{
var buf;
/* Is this an array or an ordinary object? */
if (o["length"] != undefined)
{
var i;
/* Assume it's an array if there's a length field */
buf = "[";
for (i = 0; i < o.length; i++)
{
/*
* NOTE: We don't support sparse arrays nor associative
* arrays. Should we later want to do either, we're supposed
* to send it as an object rather than as an array.
*/
if (i > 0)
{
buf = buf + ",";
}
buf = buf + this.encode(o[i]);
}
buf = buf + "]";
}
else
{
/* No length field, so it must be an ordinary object */
var key;
var first = true;
buf = "{";
for (key in o)
{
if (! first)
{
buf = buf + ",";
}
buf = buf + '"' + key + '":' + this.encode(o[key]);
first = false;
}
buf = buf + "}";
}
return buf;
}
else if (type == "string")
{
return '"' + this._internal.escape(o) + '"';
}
}
/* Allocate the public Json access object */
Json = new Object();
/* Json.encode(): encode an arbitrary object */
Json.encode = _encode;
_encode = null;
/* Json.decode(): decode a string into its object form */
Json.decode = literal_to_var;
/* Internal stuff, not for external access */
Json._internal = new Object();
Json._internal.escape = _escape;
_escape = null;
Json._internal.convert = new Object();
Json._internal.convert['\b'] = '\\b';
Json._internal.convert['\t'] = '\\t';
Json._internal.convert['\n'] = '\\n';
Json._internal.convert['\f'] = '\\f';
Json._internal.convert['\r'] = '\\r';
Json._internal.convert['"'] = '\\"';
Json._internal.convert['\\'] = '\\\\';
Json._internal.convert['\x01'] = '\\u0001';
Json._internal.convert['\x02'] = '\\u0002';
Json._internal.convert['\x03'] = '\\u0003';
Json._internal.convert['\x04'] = '\\u0004';
Json._internal.convert['\x05'] = '\\u0005';
Json._internal.convert['\x06'] = '\\u0006';
Json._internal.convert['\x07'] = '\\u0007';
Json._internal.convert['\x08'] = '\\u0008';
Json._internal.convert['\x09'] = '\\u0009';
Json._internal.convert['\x0a'] = '\\u000a';
Json._internal.convert['\x0b'] = '\\u000b';
Json._internal.convert['\x0c'] = '\\u000c';
Json._internal.convert['\x0d'] = '\\u000d';
Json._internal.convert['\x0e'] = '\\u000e';
Json._internal.convert['\x0f'] = '\\u000f';
Json._internal.convert['\x10'] = '\\u0010';
Json._internal.convert['\x11'] = '\\u0011';
Json._internal.convert['\x12'] = '\\u0012';
Json._internal.convert['\x13'] = '\\u0013';
Json._internal.convert['\x14'] = '\\u0014';
Json._internal.convert['\x15'] = '\\u0015';
Json._internal.convert['\x16'] = '\\u0016';
Json._internal.convert['\x17'] = '\\u0017';
Json._internal.convert['\x18'] = '\\u0018';
Json._internal.convert['\x19'] = '\\u0019';
Json._internal.convert['\x1a'] = '\\u001a';
Json._internal.convert['\x1b'] = '\\u001b';
Json._internal.convert['\x1c'] = '\\u001c';
Json._internal.convert['\x1d'] = '\\u001d';
Json._internal.convert['\x1e'] = '\\u001e';
Json._internal.convert['\x1f'] = '\\u001f';
/*
* At some point, we probably want to add \x80-\xff as well, and it's then
* probably more efficient to generate these strings dynamically. (Even now
* it may be, but this was the the way I started, and so it remains.)
*/
/* Test it */
libinclude("base.js");
function testFormat()
{
var test = new Object();
test.int = 23;
test.str = "hello world";
test.float = 223.1;
test.bool = true;
test.array = new Array();
test.array[0] = "hello";
test.array[1] = "world";
test.obj = new Object();
test.obj.int = 1000;
test.obj.array = new Array();
test.obj.array[0] = 42;
test.obj.array[1] = 223;
printf("%s\n", Json.encode(test));
}
function testParse()
{
var s;
s = '{ "x" : 23 }';
obj = Json.decode(s);
printf("Decode/encode of\n\t%s\nyielded\n\t%s\n\n", s, Json.encode(obj));
s = '{ "x" : [ 23, 42] }';
obj = Json.decode(s);
printf("Decode/encode of\n\t%s\nyielded\n\t%s\n\n", s, Json.encode(obj));
s = '[ 13, 19, { "x" : [ 23, 42] }, 223 ]';
obj = Json.decode(s);
printf("Decode/encode of\n\t%s\nyielded\n\t%s\n\n", s, Json.encode(obj));
s = '{ "x" : [ "hi" ] }';
obj = Json.decode(s);
printf("Decode/encode of\n\t%s\nyielded\n\t%s\n\n", s, Json.encode(obj));
s = '[ 13, 19, { "x" : [ 23, 42, { "y":{"a":"hello", "b":"world", "c":[1,2,3]}}] }, 223 ]';
obj = Json.decode(s);
printf("Decode/encode of\n\t%s\nyielded\n\t%s\n\n", s, Json.encode(obj));
}
//testFormat();
testParse();
%>
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