b51c02f93b
Antlr root nodes need to implement RootNode. Also, I didn't like the fact that the swift module didn't use the conventional package structure (lang.swift.ast) but was rolling its own convention (lang.swift.antlr4). I moved base classes for the antlr implementations into nspmd.lang.ast.impl.antlr4. The fact that a module is implemented with antlr is an implementation detail, and it doesn't deserve its own toplevel package in nspmd.lang.
PMD
About
PMD is a source code analyzer. It finds common programming flaws like unused variables, empty catch blocks, unnecessary object creation, and so forth. It supports Java, JavaScript, Salesforce.com Apex and Visualforce, PLSQL, Apache Velocity, XML, XSL, Scala.
Additionally it includes CPD, the copy-paste-detector. CPD finds duplicated code in C/C++, C#, Dart, Fortran, Go, Groovy, Java, JavaScript, JSP, Kotlin, Lua, Matlab, Objective-C, Perl, PHP, PLSQL, Python, Ruby, Salesforce.com Apex, Scala, Swift and Visualforce.
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