TerminalExpression implements an Interpret operation associated with terminal symbols in the grammar. R n in the grammar. Interpret typically calls itself recursively on the variables representing R 1 through R n . Context contains information that's global to the interpreter. Code generation We have input the default values in the following form.
Users can change any values in their application-specific names for the participants in the pattern.
Implementing the grammar is easy, too. Complex grammars are hard to maintain. Adding new ways to interpret expressions.