[Lecture Notes]Programming Language Design

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Schedule

This schedule may be subject to minor changes. Any changes will be announced in class and also be posted on the course web page.

[td]

Week	Note	Topic	Reading
Week 1: Aug 27-Aug 31		Regular languages Regular expressions Finite Automata	LectureNotes1 LectureNotes2
Week 2: Sep 3-Sep 7		Finite Automata (cont'd) Context-Free Languages	LectureNotes3 LectureNotes4
Week 3: Sep 10-Sep 14		Parsing and Ambiguity Recursive-Descent Parsing	LectureNotes5 LectureNotes6
Week 4: Sep 17-Sep 21		Turing Machines Decidability and the Halting Problem	LectureNotes7 LectureNotes8
Week 5: Sep 24-Sep 28		Decidability of Regular Languages Exam 1	LectureNotes9
Week 6: Oct 1-Oct 5		Ruby	Chapter 2
Week 7: Oct 8-Oct 12		Ruby, cont'd Io	Chapter 3
Week 8: Oct 15-Oct 19	No class Tues	Io, cont'd
Week 9: Oct 22-Oct 26		Io, cont'd Prolog	Chapter 4
Week 10: Oct 29-Nov 2		Prolog, cont'd Scala	Chapter 5
Week 11: Nov 5-Nov 9		Scala, cont'd
Week 12: Nov 12-Nov 16		Erlang	Chapter 6
Week 13: Nov 19-Nov 23	No class Thurs	Clojure	Chapter 7
Week 14: Nov 26-Nov 30		Clojure, cont'd Exam 2
Week 15: Dec 3-Dec 7		Haskell	Chapter 8
Week 16: Dec 12-Dec 14	No class Thurs	Haskell, cont'd

http://goose.ycp.edu/~dhovemey/fall2012/cs340/syllabus.html

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关键词：Programming Language Program Lecture Design schedule course Design posted

1. Defining an actor class
   
2. 
   
3. An actor class should extend the Actor base class. Here is an example:
   
4. 
   
5. case object SayHello
   
6. 
   
7. class Hello(val name : String) extends Actor {
   
8.   def act() {
   
9.     loop {
   
10.       react {
    
11.         case SayHello => {
    
12.           println(name + " says hello")
    
13.           exit()
    
14.         }
    
15.       }
    
16.     }
    
17.   }
    
18. }

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1. Sending a message
   
2. 
   
3. Messages are sent to actors using the ! operator, with the syntax
   
4. 
   
5. actor ! message
   
6. Here's a test program using the Hello actor class above:
   
7. 
   
8. object Main {
   
9.   def main(args : Array[String]) {
   
10.     val a = new Hello("Alice")
    
11.     a.start()
    
12. 
    
13.     val b = new Hello("Bob")
    
14.     b.start()
    
15. 
    
16.     a ! SayHello
    
17.     b ! SayHello
    
18.   }
    
19. }

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1. Waiting for a reply
   
2. 
   
3. Sometimes it is useful to be able to send a message to an actor and then wait for a reply. This is possible using the !! operator.
   
4. 
   
5. Example: here is an actor which accepts Add messages containing two integer values, computes the sum, and sends the sum back to the sender:
   
6. 
   
7. case class Add(val x : Int, val y : Int)
   
8. 
   
9. class Adder extends Actor {
   
10.   def act() {
    
11.     loop {
    
12.       react {
    
13.         case msg : Add => {
    
14.           val sum = msg.x + msg.y
    
15.           sender ! sum
    
16.           exit()
    
17.         }
    
18.       }
    
19.     }
    
20.   }
    
21. }

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