The Metropolis Metamodel frontend lexer.

The lexer uses JLex by Elliot Berk to create {@link metropolis.metamodel.frontend.lexer.Lexer}.

JLex can be found at http://www.cs.princeton.edu/~appel/modern/java/JLex/

We use a local copy in $METRO/src/com/JLex. @since Metropolis-1.0