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/*
client side js functions for encoding/decoding objects into linear strings
Copyright Andrew Tridgell 2005
released under the GNU GPL Version 2 or later
*/
/*
usage:
enc = encodeObject(obj);
obj = decodeObject(enc);
The encoded format of the object is a string that is safe to
use in URLs
Note that only data elements are encoded, not functions
*/
function count_members(o) {
var i, count = 0;
for (i in o) {
count++;
}
return count;
}
function encodeObject(o) {
var i, r = count_members(o) + ":";
for (i in o) {
var t = typeof(o[i]);
if (t == 'object') {
r = r + "" + i + ":" + t + ":" + encodeObject(o[i]);
} else if (t == 'string') {
var s = encodeURIComponent(o[i]).replace(/%/g,'#');
r = r + "" + i + ":" + t + ":" + s + ":";
} else if (t == 'boolean' || t == 'number') {
r = r + "" + i + ":" + t + ":" + o[i] + ":";
} else if (t == 'undefined' || t == 'null') {
r = r + "" + i + ":" + t + ":";
} else if (t != 'function') {
alert("Unable to encode type " + t);
}
}
return r;
}
function decodeObjectArray(a) {
var o = new Object();
var i, count = a[a.i]; a.i++;
for (i=0;i<count;i++) {
var name = a[a.i]; a.i++;
var type = a[a.i]; a.i++;
var value;
if (type == 'object') {
o[name] = decodeObjectArray(a);
} else if (type == "string") {
value = decodeURIComponent(a[a.i].replace(/#/g,'%')); a.i++;
o[name] = value;
} else if (type == "boolean") {
value = a[a.i]; a.i++;
if (value == 'true') {
o[name] = true;
} else {
o[name] = false;
}
} else if (type == "undefined") {
o[name] = undefined;
} else if (type == "null") {
o[name] = null;
} else if (type == "number") {
value = a[a.i]; a.i++;
o[name] = value * 1;
} else {
alert("Unable to delinearise type " + t);
}
}
return o;
}
function decodeObject(str) {
var a = str.split(':');
a.i = 0;
return decodeObjectArray(a);
}
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