11/15/13. Objectives. Review. Our Screen Saver Dependencies. Our Screen Saver Dependencies. Project Deliverables Timeline TEAM FINAL PROJECT

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1 Objectives Team Final Project Review What design pattern is used in the screen savers code? What is the design principle we discussed on Wednesday? What was likely to change? Open up Eclipse Nov 15, 2013 Sprenkle - CSCI209 1 Nov 15, 2013 Sprenkle - CSCI209 2 Our Screen Saver Dependencies ButtonPanel Our Screen Saver Dependencies ButtonPanel Note: dependencies are on abstractions and classes unlikely to change Mover Canvas Factory Mover Canvas Factory Bouncer BouncerFactory Bouncer BouncerFactory Nov 15, 2013 Sprenkle - CSCI209 3 Nov 15, 2013 Sprenkle - CSCI209 4 Project Deliverables Timeline Worth 20% of your course grade TEAM FINAL PROJECT Deliverable Who Weight Due Date Preparation Individual 8% Mon, 11/18 Preliminary Implementation Intermediate Implementation, Demo Team 30% Mon, 12/2 Team 12% Friday, 12/6 Final Implementation Team 35% You decide à latest 12/13, 5 p.m. Analysis Individual 15% 12/13, 5 p.m. Nov 15, 2013 Sprenkle - CSCI209 5 Nov 15, 2013 Sprenkle - CSCI

2 Teams Emily, Sam, Brandon Haley, James, Scott, Eric Andrew, Jean Paul, Deirdre, Cory David, Johanna, Madeline, Allen Shannon, Lee, Stephen, Gabi SLogo Project Overview Goal: Create an IDE for simplified version of Logo Logo: programming language designed to teach children to program Ø Low floor, high ceiling Nov 15, 2013 Sprenkle - CSCI209 7 Nov 15, 2013 Sprenkle - CSCI209 8 SLogo Functionality Overview User enters SLogo commands Ø Commands defined by specification Interpreted and batch modes for entering commands Ø User can save files of commands Have turtle execute the commands Ø Or descriptive error messages Many possible extensions High-Level Design Brainstorm What are the pieces that you ll need to implement for this project? Nov 15, 2013 Sprenkle - CSCI209 9 Nov 15, 2013 Sprenkle - CSCI Programming Language Syntax What does an identifier look like in Java? What does an assignment statement look like in Java? What can be on the left hand side? What can be on the right hand side? What does a multiplication look like? How do we evaluate arithmetic s? Nov 15, 2013 Sprenkle - CSCI Programming Language Design Must be unambiguous Ø Programming Language defines a syntax and semantics Interpreting programming languages Ø Parse program into tokens Example: x = 4*3; à <id> <assignment> <num> <mult> <num> <endofstmt> Ø Verify that tokens are in a valid form Ø Generate executable code Nov 15, 2013 Sprenkle - CSCI

3 Interpreting Interpreting ELAN: Educational programming LANguage s FWARD SUM s Nov 15, 2013 Sprenkle - CSCI Nov 15, 2013 Sprenkle - CSCI What We Need to Do/Represent Analysis Analysis Evaluation Nov 15, 2013 Sprenkle - CSCI What We Need to Do/Represent Analysis Ø Recognize/create tokens Ø Report errors in creating tokens Analysis Ø Convert infix tokens into postfix Report errors Ø Parse tokens into s Report errors Evaluation Ø Evaluate s with respect to turtle/ model Nov 15, 2013 Sprenkle - CSCI Code Review Import an existing project: Ø /home/courses/cs209/handouts/ slogo.tgz Understanding the Code How does the given code map to lexical analysis, semantic analysis, and evaluation components? What questions do you have about the code? What do you want to find out? Nov 15, 2013 Sprenkle - CSCI Nov 15, 2013 Sprenkle - CSCI

4 Interpreting Java s Streamizer s tokens Analysis Important classes Ø slogo.parser.slogoparser Ø slogo.parser.tokens.factory s/instructions parser Nov 15, 2013 Sprenkle - CSCI Output: slogo.parser.tokens.* Assignment Nov 15, 2013 Sprenkle - CSCI Analysis Important Classes Ø Common interface: slogo.parser.parser Ø slogo.parser.*parser Ex: slogo.parser.parser Ø slogo.parser.instructionparser Decides which instruction parser to call Output: slogo.s.* or slogo.instructions.* Evaluation Important Classes Ø Base class: slogo.grammarelement Ø Subclasses: slogo.instructions.instruction slogo.. Output: Object AssignmentParser Nov 15, 2013 Sprenkle - CSCI Assignment Nov 15, 2013 Sprenkle - CSCI Bringing it together slogo.* Ø Breaks classes into appropriate packages: s, s, Instructions, Parsers slogo.parser Ø Parse s to create Instructions slogo.instructions Ø Represent instructions Ø evaluate method Bringing it together Mapping between, Instruction, Parser Ø Knows which Parser to call based on instructions.prop and mapping from to Parser Run SLogoParser with tests/ assign_repeat Nov 15, 2013 Sprenkle - CSCI Nov 15, 2013 Sprenkle - CSCI

5 Practice Adding Instructions 1. Create a token for instruction Ø Likely a subclass of token.reserved Ø Same prefix as new instruction, e.g., If.java 2. Create a parser for the instruction with same prefix as instruction, e.g., IfParser.java Ø Parsing class (presumably implementing Parser) returns an instance of parsed Instruction 3. Create an instruction with prefix name, e.g., If.java 4. Add instruction name to file instructions.prop, e.g., add a single line to file containing string If Nov 15, 2013 Sprenkle - CSCI Brainstorming What do you need to do to complete the project? What do you see for the final project? What s going to change? Where do you think you ll run into problems? To focus your thinking, consider this use case: "The user starts the program, types 'fd 50' in the command window, and sees the turtle move in the display window leaving a trail. Ø What are other use cases? Nov 15, 2013 Sprenkle - CSCI Preparation Analysis Due Monday TODO What are the main parts/steps that need to be completed to complete the project? Ø How much work does each part require? Approximate in terms of time or relative to the other steps. Ø How many people should work on each part? How will your program handle the following use case: "The user starts the program, types 'fd 50' in the command window, and sees the turtle move in the display window leaving a trail.? Ø From your description, it should be clear which classes/objects are responsible for completing each part of the task. What 3 extensions would you like to have in the final application? A plan for how you would tackle implementing the project Ø What parts can be completed independently of the other parts? Ø What parts need to be completed before other parts? The parts of the project you're most interested in working on, in ranked order. Any questions about the given specification. Nov 15, 2013 Sprenkle - CSCI Project Analysis due Monday Team name by Sunday at midnight Nov 15, 2013 Sprenkle - CSCI