Building Parsers with Java™

5.3. A Coffee Grammar

You can create a grammar for the coffee data language by applying the following algorithm:

1.	Define the parser you want as a composite of subparsers.
2.	Repeat step 1 until every subparser is defined or is a terminal.

The parser you want to define is

coffee 

From the preceding language element, you can see that a coffee description is, at a high level, the following:

coffee = name ',' roast ',' country ',' price; 

A coffee's name is a word followed optionally by a former name. The former name is a word in parentheses.

name       = Word (formerName | Empty); 
formerName = '(' Word ')';

The roast is a word followed optionally by the characters /French:

roast    = Word (orFrench | Empty); 
orFrench =  '/' "french";

The country ...