vm/dictionary library

Classes

Dictionary: A "stack frame" - or a dictionary of functions, with references to its parent frames so that closures can be implemented
DictionaryListener: implements basic word functionality
GetTopScope: gets the topmost scope from this dictionary listener
Identifier: A value holding an identifier
PopScope: Pop the top scope off this dictionary listener
PushNewScope
SetGlobal: if we set a global, we use the bottom dictionary rather than the top
SetLocal: set an identifier to have a value