initialize method
Implementation
void initialize(Grammar grammar) {
final expressionInitializer = ExpressionInitializer();
expressionInitializer.initialize(grammar);
final optionalExpressionResolver = OptionalExpressionResolver();
optionalExpressionResolver.resolve(grammar);
final expressionStartCharactersResolver =
ExpressionStartCharactersResolver();
expressionStartCharactersResolver.resolve(grammar);
final expressionStartTerminalsResolver = ExpressionStartTerminalsResolver();
expressionStartTerminalsResolver.resolve(grammar);
}