Package elan

Elan is a package for doing recursive descent parsing of a simple, but complex language.

See:
Description

Interface Summary

Context

Class Summary

CharConsts
GrammarElement	All elements of the elan language (e.g., that make up an abstract syntax tree) should extend GrammarElement.
StringConsts
TurtleContext	The TurtleContext class implements the Context interface and provides a hook through which the parser in the elan package can intereact with the TurtleManagerand the Output in the graphics package.

Package elan Description

Elan is a package for doing recursive descent parsing of a simple, but complex language. The code adheres to the open-closed principle and uses several design patterns.

Elan is Distinctive style or flair or Enthusiastic vigor and liveliness. It's also Easy language (or substitute Example for Easy).

The Elan parsing module consiste of four packages.

• The elan.instruction package consists of classes that represent instructions. Each class in the package represents an instruction in the language being parsed, and creates something like an AST (abstract syntax tree) for the instruction. Each instruction should extend elan.instruction.Instruction and provide an appropriate implementation of the method evaluate.

• The elan.parser package.

• The elan.parser.token package.

• The elan.expression package.

Owen L. Astrachan

Last modified: Wed Nov 28 12:59:29 EST 2001