The Parser Generator JavaCUP

The original version is from http://www.cs.princeton.edu/ appel/modern/java/CUP/, but we use a local modified version.

• generates a class Parser.java, which contains the parser.
• generates a class Parser.tables, which contains the parsing tables.
• generates a class Tokens.java, which is suitable to be used by the scanner.
• if there are situations, where it wouldn't know, whether to shift or to reduce, it reports a conflict.