Boo AST Attribute Ideas

Here are some ideas I had for handy Boo AST (abstract syntax tree) attributes:

[HandleExceptionWithMessageBox]
def Foo():
  CallSomething()
  DoStuff()
  MaybeCrash()

expands to

def Foo():
  try:
    CallSomething()
    DoStuff()
    MaybeCrash()
  except ex:
    MessageBox.Show(ex.Message)

Very handy for UI code that calls into business objects that may throw up exceptions. Not having to explicitly write the try…except block is a timesaver!

Also,

class MyForm:
  btn = Button()

  [HandleEvent(btn.Click)]
  def ButtonClicked():
    print "button clicked"

expands to

class MyForm:
  btn = Button()

  def constructor():
    btn.Click += ButtonClicked

  def ButtonClicked():
    print "button clicked"

This allows the event hookup to appear on the handling method, rather than miles away in the constructor. This is great for UI code since it means u can delete a method and know there is not still a line of code else trying to point to it. (So basically is works like the VB.NET "handles" keyword.)

: 11 May 2006 02:13 |  Tags: Boo Coding Dotnet |  Comments (0) |  Report a problem