Releasing ParseTree 1.3.3
Published 2005-02-01 @ 12:28
I am releasing ParseTree 1.3.3 today in preparation of our ruby2c release (also today). Changes in ParseTree are minor, but necessary for ruby2c.
ParseTree is a C extension (using RubyInline) that extracts the parse tree for an entire class or a specific method and returns it as a s-expression (aka sexp) using ruby’s arrays, strings, symbols, and integers.
As an example:
[:defn, :conditional1, [:scope, [:block, [:args, :arg1], [:if, [:call, [:lvar, :arg1], :==, [:array, [:lit, 0]]], [:return, [:lit, 1]], nil], [:return, [:lit, 0]]]]]
- Uses RubyInline, so it just drops in.
- Includes SexpProcessor and CompositeSexpProcessor.
Allows you to write very clean filters.
- Includes show.rb, which lets you quickly snoop code.
- Includes abc.rb, which lets you get abc metrics on code.
abc metrics = numbers of assignments, branches, and calls. whitespace independent metric for method complexity.
- Only works on methods in classes/modules, not arbitrary code.
- Does not work on the core classes, as they are not ruby (yet).
3 minor enhancement
- Cleaned up parse_tree_abc output
- Patched up null class names (delegate classes are weird!)
Added UnknownNodeError and switched SyntaxError over to it.
2 bug fixes
- Fixed BEGIN node handling to recurse instead of going flat.
- FINALLY fixed the weird compiler errors seen on some versions of gcc 3 .4.x related to type punned pointers.