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Interpreter for ZOOM-I

Interpreter for ZOOM-I. Andrew Deren Initial Presentation - SE690 5/30/03 http://www.adersoftware.com/se690/. What is ZOOM?. ZOOM is a set of tools and notation specifications used for development of large scale Object-Oriented systems. ZOOM stands for Z-based Object Oriented Modeling

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Interpreter for ZOOM-I

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  1. Interpreter for ZOOM-I Andrew Deren Initial Presentation - SE690 5/30/03 http://www.adersoftware.com/se690/

  2. What is ZOOM? • ZOOM is a set of tools and notation specifications used for development of large scale Object-Oriented systems. • ZOOM stands for Z-based Object Oriented Modeling • The ZOOM Project is supervised by Dr. Jia

  3. Part of Zoom • There are 3 parts of ZOOM: • ZOOM-D – design notation • Formal notation to specify design models: object design models and user interface design. • ZOOM-S – specification notation • Formal notation to describe the use cases with formally specified preconditions and postconditions. • ZOOM-I – implementation language • Can be any object-oriented language: Java, C++, etc • Currently work is done on extending Java. • Language will be extended with zoom specific features, but parts of the software system can be developed in target language.

  4. What is Interpreter? • An interpreter is a program that accepts any program (the source program) expressed in a particular language (the source language), and runs that source program immediately. • The interpreter does not translate the source program into object code prior to execution.

  5. Why Write Interpreter? • Easier to test programs, no need to recompile. Can test fragments of code. • Changes to design of ZOOM language are easier to test in interpreter. • Some features of ZOOM might be hard to translate to java code directly. • Interpreters are much easier to implement than compilers.

  6. Programming Language Lifecycle Model Can be implemented as Interpreter to test language features

  7. Features different from Java • Enumerations • Const • Type definitions • Generics • Language support for Sets/Lists/Relations • Foreach statement

  8. Enumerations • enum States { AL, CA, IL, NY, MA}; • Better type-safety than int or String. Can only use valid values and is enforced by compiler at compile time.

  9. Const & Type definitions • const int PI = 3.141592653 • Nicer syntax for: static final int PI = 3.141592653 • typedef SmallInt = 0 .. 100 • typedef CourseSet = {Course}

  10. Generics • class Hashtable<Key, Value> • Provides type safety for collections and other types • No longer casts needed to cast back to object

  11. Sets/Lists • Build in support for list and set construction • list = [1 .. 10] // list with 10 elements 1 to 10 • list = [1, 2, 3, 4] • list = [int x: x > 0 & x < 5 @ x * 2] • Similar syntax for set creation, but uses { instead of [ • Build in operators for list and set operations: • Union, intersection, cardinality, membership tests, etc. • boolean inList = x in list;

  12. Foreach • New addition to the language • foreach (Type x in Expression) • Expression must result in typesafe iterator.

  13. Interpreter Features • Integrated into zoom IDE • Syntax highlight and other nice editor features • Run zoom code directly from IDE with statement step through, variable evaluation, etc.

  14. Interpreter Architecture • 1. Program text is fetched to ZOOM Parser which builds AST nodes. • 2. AST nodes are transformed into language elements (Statements, Expressions, etc) • 3. Type checker checks type validity of the program. • 4. Interpreter walks AST evaluating statements and expressions.

  15. Interpreter Architecture • Operates on AST elements (expressions, statements, etc) • Interpreter runtime system holds all data in objects derived from Val • Each Val type knows how to interact with other Val types and supports all operators that can be performed by that type int x = 3; // creates ValInt int y = 4; // created ValInt int z = x + y; // calls x.operator_plus(y)

  16. Status • Currently interpreter can be used in command line mode, or as swing application. • Most operators, expressions and statements are functional for primitive types, sets and lists, but no object-oriented features yet.

  17. References • David A. Watt & Deryck F. Brown. Programming Language Processors in Java. Prentice Hall, 2000. • Alfred V. Aho, Ravi Sethi, Jeffrey D. Ullman. Compilers: Principles, Techniques and Tools. Addison-Wesley,1988. • Ravi Sethi. Programming Languages, Concepts & Constructs. Addison-Wesley, 1996 • Randy M. Kaplan. Constructing Language Processors for Little Languages. John Wiley & Sons, Inc., 1994

  18. Questions?

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