Automatic Source Code Generation in JPie

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Automatic Source Code Generation in JPie
public BMI() super()
propChangeSupportnew PropertyChangeSupport(this)
// methods public int getHeight()
return height public void
setHeight(int h) int oldValue
this.height height h
propChangeSupport.firePropertyChangeInteger(h))

• By Benjamin Brinckerhoff

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• What is JPie?
• JPie is a new kind of graphical programming
  environment.
• Why use JPie?
• Direct Learn software concepts
• Easy Eliminate syntax errors
• Live Edit programs while they run
• Practical Create actual Java programs

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Problem JPie teaches concepts, but not syntax
Time spent learning
Solution Generate source code
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import javax.swing. import java.beans. public
class Timer extends Object // fields
private PropertyChangeSupport propChangeSupport
null private volatile int timeLeft (int)
100.0 // constructors public Timer()
super() propChangeSupportnew
PropertyChangeSupport(this) // methods
public int getTimeLeft() return
timeLeft public void decrement()
setTimeLeft((int) (getTimeLeft()-1.0))
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• Goals
• Readability generated source code should
  exhibit good programming practices and style
• Correctness a program created from generated
  source code should behave identically to its JPie
  counterpart

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How to Generate Code
Use JPies internal model to recursively build
source code

DynamicClass
public void update() setBmi((((weight/(Math
.pow(height,2.0)))703.0))) chooseColor()

DynamicField
DynamicMethod
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• Progress
• JPie can automatically generate source code for
  most features
• Many programs created in JPie can run outside
  JPie via generated source code
• Current Work
• Completing source code generation for advanced
  features and special cases.
• Implementing mixed-mode editing editable source
  code

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Questions? Email me bb7_at_cec.wustl.edu Email
Professor Ken Goldman kjg_at_cse.wustl.edu JPie
web site jpie.cse.wustl.edu