Not much here right now, just a placeholder because we are rushing a release…
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:
class Example def conditional1(arg1) if arg1 == 0 then return 1 end return 0 end end
[: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 show.rb, which lets you quickly snoop code.
- Includes abc.rb, which lets you get abc metrics on code.
- abc metrics = number 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).
- ParseTree Examples