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From: Rob Smart <SMARTROB@uk.ibm.com> 

Implement an osParseJSON method useful for handling simple JSON returns
from http requests.  This will only work in C# at this point.
0.6.0-stable
Sean Dague 2008-09-12 15:04:13 +00:00
parent 8d6096b815
commit 1b333a0f58
3 changed files with 197 additions and 0 deletions
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5
OpenSim/Region/ScriptEngine/Common/BuiltIn_Commands_BaseClass.cs
View File

@ -2035,6 +2035,11 @@ namespace OpenSim.Region.ScriptEngine.Common
} }
public System.Collections.Hashtable osParseJSON(string JSON)
{
return m_LSL_Functions.osParseJSON(JSON);
}
//for testing purposes only //for testing purposes only
public void osSetParcelMediaTime(double time) public void osSetParcelMediaTime(double time)
{ {

190
OpenSim/Region/ScriptEngine/Common/OSSL_BuilIn_Commands.cs
View File

@ -25,6 +25,7 @@
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/ */
using System; using System;
using System.Collections;
using OpenMetaverse; using OpenMetaverse;
using Nini.Config; using Nini.Config;
using OpenSim.Framework.Console; using OpenSim.Framework.Console;
@ -582,5 +583,194 @@ namespace OpenSim.Region.ScriptEngine.Common
{ {
World.ParcelMediaSetTime((float)time); World.ParcelMediaSetTime((float)time);
} }
public Hashtable osParseJSON(string JSON)
{
// see http://www.json.org/ for more details on JSON
string currentKey=null;
Stack objectStack = new Stack(); // objects in JSON can be nested so we need to keep a track of this
Hashtable jsondata = new Hashtable(); // the hashtable to be returned
try
{
// iterate through the serialised stream of tokens and store at the right depth in the hashtable
// the top level hashtable may contain more nested hashtables within it each containing an objects representation
for (int i=0;i<JSON.Length; i++)
{
// Console.WriteLine(""+JSON[i]);
switch(JSON[i])
{
case '{':
// create hashtable and add it to the stack or array if we are populating one, we can have a lot of nested objects in JSON
Hashtable currentObject = new Hashtable();
if(objectStack.Count==0) // the stack should only be empty for the first outer object
{
objectStack.Push(jsondata);
}
else if(objectStack.Peek().ToString()=="System.Collections.ArrayList")
{
// add it to the parent array
((ArrayList)objectStack.Peek()).Add(currentObject);
objectStack.Push(currentObject);
}
else
{
// add it to the parent hashtable
((Hashtable)objectStack.Peek()).Add(currentKey,currentObject);
objectStack.Push(currentObject);
}
// clear the key
currentKey=null;
break;
case '}':
// pop the hashtable off the stack
objectStack.Pop();
break;
case '"':// string boundary
string tokenValue="";
i++; // move to next char
// just loop through until the next quote mark storing the string
while(JSON[i]!='"')
{
tokenValue+=JSON[i++];
}
// ok we've got a string, if we've got an array on the top of the stack then we store it
if(objectStack.Peek().ToString()=="System.Collections.ArrayList")
{
((ArrayList)objectStack.Peek()).Add(tokenValue);
}
else if(currentKey==null) // no key stored and its not an array this must be a key so store it
{
currentKey = tokenValue;
}
else
{
// we have a key so lets store this value
((Hashtable)objectStack.Peek()).Add(currentKey,tokenValue);
// now lets clear the key, we're done with it and moving on
currentKey=null;
}
break;
case ':':// key : value separator
// just ignore
break;
case ' ':// spaces
// just ignore
break;
case '[': // array start
ArrayList currentArray = new ArrayList();
if(objectStack.Peek().ToString()=="System.Collections.ArrayList")
{
((ArrayList)objectStack.Peek()).Add(currentArray);
}
else
{
((Hashtable)objectStack.Peek()).Add(currentKey,currentArray);
// clear the key
currentKey=null;
}
objectStack.Push(currentArray);
break;
case ',':// seperator
// just ignore
break;
case ']'://Array end
// pop the array off the stack
objectStack.Pop();
break;
case 't': // we've found a character start not in quotes, it must be a boolean true
if(objectStack.Peek().ToString()=="System.Collections.ArrayList")
{
((ArrayList)objectStack.Peek()).Add(true);
}
else
{
((Hashtable)objectStack.Peek()).Add(currentKey,true);
}
//advance the counter to the letter 'e'
i = i+3;
break;
case 'f': // we've found a character start not in quotes, it must be a boolean false
if(objectStack.Peek().ToString()=="System.Collections.ArrayList")
{
((ArrayList)objectStack.Peek()).Add(false);
}
else
{
((Hashtable)objectStack.Peek()).Add(currentKey,false);
}
//advance the counter to the letter 'e'
i = i+4;
break;
default:
// ok here we're catching all numeric types int,double,long we might want to spit these up mr accurately
// but for now we'll just do them as strings
string numberValue="";
// just loop through until the next known marker quote mark storing the string
while(JSON[i]!='"' && JSON[i]!=',' && JSON[i]!=']' && JSON[i]!='}' && JSON[i]!=' ')
{
numberValue+=""+JSON[i++];
}
i--; // we want to process this caracter that marked the end of this string in the main loop
// ok we've got a string, if we've got an array on the top of the stack then we store it
if(objectStack.Peek().ToString()=="System.Collections.ArrayList")
{
((ArrayList)objectStack.Peek()).Add(numberValue);
}
else
{
// we have a key so lets store this value
((Hashtable)objectStack.Peek()).Add(currentKey,numberValue);
// now lets clear the key, we're done with it and moving on
currentKey=null;
}
break;
}
}
}
catch(Exception e)
{
LSLError("osParseJSON: The JSON string is not valid " + JSON);
}
return jsondata;
}
} }
} }

2
OpenSim/Region/ScriptEngine/Common/OSSL_BuilIn_Commands_Interface.cs
View File

@ -64,6 +64,8 @@ namespace OpenSim.Region.ScriptEngine.Common
void osOpenRemoteDataChannel(string channel); void osOpenRemoteDataChannel(string channel);
System.Collections.Hashtable osParseJSON(string JSON);
string osGetScriptEngineName(); string osGetScriptEngineName();
void osSetParcelMediaTime(double time); void osSetParcelMediaTime(double time);