Last week I tried to do semantic predicate in our parser grammar. We
hoped that it could solve most of the problems we were facing.
Unfortunately, it didn’t end up well as we cannot make semantic
predicate working with backtracking. This week I will migrate to ANTLR
3.4. and see if it helps solve the problem. Here are what I have done in
the last week:

    Supported braces in command arguments
    Improved comment handling
    Supported ANSI C Quoting
    Supported shortcut capability for && and || in arithmetic expansion
    Supported arithmetic expression
    Supported break built-in
    Improved our build system to reduce dependencies
    Made arithmetic expansion follow POSIX
    Improved exception hierarchy
    Implemented shift built-in
    Improved the ast_printer utility

A few stories are blocked due to the backtracking problem.

This week I will:

    Upgrade to ANTLR 3.4 and see if it helps solve the backtracking problem
    Fix errors in the CI Server
    Break down walker grammar to reduce compile time
    Use bash to verify test scripts
    Support alias
    Handle options to the local built-in
    Upgrade to Paludis 0.64.1
    Support thread-safety
    Clean up warnings from doxygen

-- 
Best wishes,
Mu Qiao
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