flay

code analyzer that reports structural similarities

Flay analyzes code for structural similarities. Differences in literal values, variable, class, method names, whitespace, programming style, braces vs do/end, etc are all ignored. Making this totally rad.

• Plugin system allows other languages to be flayed.
  • Ships with .rb and .erb. javascript and others will be available separately.
• Includes FlayTask for Rakefiles.
• Differences in literal values, variable, class, and method names are ignored.
• Differences in whitespace, programming style, braces vs do/end, etc are ignored.
• Works across files.
• Reports differences at any level of code.
• Totally rad.
• Adds a score multiplier to identical nodes.
• Run verbose to see an N-way diff of the code.

Actual Output

% flay -v ~/Work/svn/ruby/ruby_1_8/lib/cgi.rb
Processing /Users/ryan/Work/svn/ruby/ruby_1_8/lib/cgi.rb...

Matches found in :defn (mass = 184)
  A: /Users/ryan/Work/svn/ruby/ruby_1_8/lib/cgi.rb:1470
  B: /Users/ryan/Work/svn/ruby/ruby_1_8/lib/cgi.rb:1925

A: def checkbox_group(name = "", *values)
B: def radio_group(name = "", *values)
     if name.kind_of?(Hash) then
       values = name["VALUES"]
       name = name["NAME"]
     end
     values.collect do |value|
       if value.kind_of?(String) then
A:       (checkbox(name, value) + value)
B:       (radio_button(name, value) + value)
       else
         if (value[(value.size - 1)] == true) then
A:         (checkbox(name, value[0], true) + value[(value.size - 2)])
B:         (radio_button(name, value[0], true) + value[(value.size - 2)])
         else
A:         (checkbox(name, value[0]) + value[(value.size - 1)])
B:         (radio_button(name, value[0]) + value[(value.size - 1)])
         end
       end
     end.to_s
   end

IDENTICAL Matches found in :for (mass*2 = 144)
  A: /Users/ryan/Work/svn/ruby/ruby_1_8/lib/cgi.rb:2160
  B: /Users/ryan/Work/svn/ruby/ruby_1_8/lib/cgi.rb:2217

   for element in ["HTML", "BODY", "P", "DT", "DD", "LI", "OPTION", "THEAD", "TFOOT", "TBODY", "COLGROUP", "TR", "TH", "TD", "HEAD"] do
     methods = (methods + (("          def #{element.downcase}(attributes = {})\n" + nO_element_def(element)) + "          end\n"))
   end
...

Get The Code

If you just want to use flay, you can install it via RubyGems:

gem install flay

If you want to hack on flay, clone it from GitHub:

git clone git://github.com/seattlerb/flay

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