undefined method `[]' for nil:NilClass about cane HOT 7 CLOSED

Open up /Users/sobrinho/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/cane-1.0.0/lib/cane/abc_check.rb and print out the file/line number. From there, hopefully you can narrow down a minimal code snippet to reproduce, and post that here. Thanks!

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 27     # Recursive function to process an AST. The `complexity` variable mutates,
 28     # which is a bit confusing. `nesting` does not.
 29     def process_ast(node, complexity = {}, nesting = [])
 30       if method_nodes.include?(node[0])
 31         nesting = nesting + [node[1][1]]
 32         complexity[nesting.join(" > ")] = calculate_abc(node)
 33       elsif container_nodes.include?(node[0])
 34         parent = if node[1][1][1].is_a?(Symbol)
 35           node[1][1][1]
 36         else
 37           node[1][-1][1]
 38         end
 39         nesting = nesting + [parent]
 40       end
 41 
 42       if node.is_a? Array
 43         node[1..-1].each { |n| process_ast(n, complexity, nesting) if n }
 44       end
 45       complexity
 46     end

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I meant your code that breaks it!

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How can I discover the line and number from there?

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Work back the stack trace a step or two, the find_violations method. Might not be able to get line and number, but at least will give you file name.

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I ran into the same issue when evaluating a fellow student's Ruby program for style & complexity using the cane gem. He had a class definition that had not been closed with an "end" statement. But since the class was not being used anywhere, it did not cause any runtime errors.

class Load
  def file_load
    @file = CSV.open(filename, :headers => true,
                                :header_converters => :symbol)
  end

Running the command cane --abc-glob '**/*.rb' returned the same trace regarding the same error.

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I have seen this once also on a syntax error. Not sure what correct behaviour is here (but definitely raising awkwardly is wrong).

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