Compiler Framework for Building Java Language Extensions

Polyglot is a highly extensible compiler frontend framework,while avoiding code duplication.Users may extend the framework to define any necessary changes on abstract syntax tree and semantic analysis for implementing language extensions.In order to direct users to work with Polyglot fleetly,the main flow and class hierarchy of Polyglot are summarized,and the methodologies of the scalable extensibility are anatomized,in which the delegation,visitors and abstract factories are employed.And the use steps of Polyglot and the related application are stated in a nut shell.