XMLScheme

Goals and Design Rational

• We use XML to define data:
  
  • Numbers, Strings, Records, List, and even Expressions or whole Programs can be considered as data.
• Has XML been used to define a programming language before?
  
  • Yes: eXtensible Stylesheet Languages: Transformations (XSLT)
• Our goal: XMLScheme
  
  • XMLScheme is an XML-based programming language, whose semantics is given in Scheme.
  • XMLScheme uses a strict order of tags to facilitate parsing.

The evolution of XMLScheme

Common Definitions:

• utils.scm: Auxiliary functions
• readfile.scm: File reader functions

Stages:

• First Interpreter:
  xmlscheme-01.scm: Simple Calculator Language
  environment.scm: Record-based Environment
• If-Then-Else:
  xmlscheme-02.scm: Language with Conditionals
• Let:
  xmlscheme-03.scm: Language with Declarations
• Procedures and Procedure Calls:
  xmlscheme-04.scm: Simple Functional Language
  closure.scm: Closures
  xmlscheme-04a.scm: Simple Functional Language with Dynamic Scoping
  closurea.scm: Closures with Dynamic Scoping
  
• Hyper References:
  xmlscheme-05.scm: Language with an Import facility
• Recursive Function Definitions:
  xmlscheme-06.scm: Language with mutual recursive functions
  closureb.scm: Recursive Closures
• Expression Sequences:
  xmlscheme-07.scm: Language with Commands
• More Operators:
  xmlscheme-08.scm: Language with Relational Operators
• Loops:
  xmlscheme-09.scm: Language with For Loops
• Assignment:
  xmlscheme-10.scm: A first Imperative Language
  ref-environment.scm: A real memory
• Call-By-Value and Call-By-Reference:
  xmlscheme-11.scm: Language with different Parameter Passing Modes
  closurec.scm: Call-By-Reference Closures
  targets.scm: Reference Modes
• Classes, Objects, and Method calls:
  xmlscheme-12.scm: Simple Object-Oriented Language
  closured.scm: Class Closures
  targetsb.scm: Object Values
• Embedding Scheme:
  xmlscheme-13.scm: A foreign code concept

Sample Programs