//
// simptokens.lex: specification for "if", identifiers, 
//                 numbers, and whitespace
// To build:
//      sablecc simptokens.lex
//      javac Main.java
//
Helpers
   digit = ['0'..'9'];
   space = ' ' | 9;
   newline = 10 | 11 | 12;
Tokens
   if = 'if';
   id = ['a'..'z'](['a'..'z'] | digit)*;
   number = digit+;
   real = (digit+ '.' digit*) | (digit* '.' digit+);
   whitespace = (space | newline)*;
   comments = ('--' (['a'..'z']|space)* newline );
Ignored Tokens
   whitespace,
   comments;