Well-parenthesized language parser

This project is a JavaCC parser configuration which generates a parser for a language with well-balanced parentheses. The features that this language has is:

• Each string accepted by the language consists of multiple lines (but at least 1 line).
• Lines must not be empty.
• Lines must contain well-balanced parentheses, e.g. (), ()()(), (()()), (((()))).
• Only parentheses are allowed, so any other character makes the input invalid.
• (As an exception to the first rule) there must be a blank final line at the end of the input.

E.g. the following is a good input to the parser:

()(())
(())(((()())))
((((((((((()))))))))))
(())()()()()()
((()()())()()(()(())))()
<blank line here>

How to run

To build the Java code and run: ./run.sh. This is an alias for:

javacc assignment.jj && javac *.java && java Assignment < test.txt > output.txt 2> err.txt

Output

The standard output stream will contain the parser's decision as to whether the string is valid — the output will either be PASS or FAIL. If it is FAIL, the standard error will also contain the line number of the first error that caused the invalidity.