Pretty pretty please my beloved JetBrains developer team? PhpStorm is literally the best IDE out there (even better than Visual Studio 2012). It'd be absolutely awesome if you guys adopted this new way of coding!
Here is a jison file to get familiar with the syntax (This is a formula language for jQuery.sheet - the ajax spreadsheet): http://jquerysheet.googlecode.com/svn/branches/3.x/parser/formula/formula.jison
Yacc and Lex (the languages that Jison is based) are actually somewhat old (Yacc 1970) but much like many of the languages written then, like SQL, they have not changed much and are increadibly useful.
Please submit feature request at http://youtrack.jetbrains.com/IDEA. If we hear enough demand we could invest some resources to it.
Jison for C# is born and working!