Features:

• Text Editor
  • Syntax Highlighting (Might want to turn off on slow computers :P)
  • New / Load / Save functions.
  • Displays current line.
• Validator
  • Displaying
    • Shows the Line of all errors it finds.
    • Shows the actuall line that errors it.
    • The type of error it found.
    • Error number.
  • Detects what identifier the line is in. Example: it can tell if a gamerule is out of the "gamerule" identifier.
  • Made for 3.3 mod format.

Error Checks (01-15):

1. More Enviroment Joints then there is Enviroment Objects.
2. Invalid game rule.
3. Invalid joint field.
4. Invalid body field.
5. Invalid enviroment object field.
6. Invalid enviroment joint field.
7. Too many Joint edits detected. (Detects if player is used).
8. Too many Body edits detected. (Detects if player is used).
9. Unknown identifier.
10. Invalid Enviroment Object number.
11. Invalid Enviroment Joint number.
12. Invalid Enviroment Object specified in Enviroment Joint Call.
    1. First Enviroment Object.
    2. Second Enviroment Object.
13. More then 16 Enviroment objects detected.
14. Invalid Body part.
15. Invalid Joint.

This one was done in C#.net, if you want the source pm me :P
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