A little update:

• I've created basic lexer with JFlex
• I've created basic bnf-like file which allows to generate parser with Grammar-Kit. It allows different injections, so i think it would be enough to handle perl.
• I've implemented few built-ins tree building: package, sub, use and require
• I've created annotator, which allows to show a error message with proper syntax hint.
• Here is a screenshot.
• Also, i've created basic lexer and parser for POD format and it looks like this.
• I've named the project: Camelcade :)