Release Notes v1.1 This version takes the vanilla implementation using the Visitor design pattern and creates a generic Repl that can use the command line to determine which Visitor the user wants to use. Specific changes: - Visitor interface now includes a getDefaultState() method - PersistentWalker class now provides for a visitor that will retain the same instance of a state across multiple traversals of ASTs. This allows for multiple user-entered expressions to interact with each other (e.g. previous statements can modify a global environment to affect future evaluations) - Created VisitException class to better facilitate the separation of sources of errors that arise while lexing, parsing and walking user input. (For an evaluator, WalkException is a runtime error). - Renamed Repl to Main. Rewrote it to create a generic instance of PersistentWalker wrapped around a visitor of a class specified on the command line - There is only one visitor class at this time: Evaluator. Example Usages: - To use as a Repl for a standard interpretor (expression evaluator): > $(JAVA_EXEC) Main -w Evaluator - OR more simply: > $(JAVA_EXEC) Main - - To evaluate a file of expressions called foo.txt: > $(JAVA_EXEC) Main -w Evaluator foo.txt OR more simply: > $(JAVA_EXEC) Main foo.txt