undefined method `empty?' for nil:NilClass

[jamesarosen]

Stack trace:

undefined method `empty?' for nil:NilClass
/Users/jamesrosen/.rvm/gems/ree-1.8.7-2011.03/gems/rocco-0.6/lib/rocco/layout.rb:30:in `sections'
/Users/jamesrosen/.rvm/gems/ree-1.8.7-2011.03/gems/rocco-0.6/lib/rocco/layout.rb:20:in `map'
/Users/jamesrosen/.rvm/gems/ree-1.8.7-2011.03/gems/rocco-0.6/lib/rocco/layout.rb:20:in `sections'
/Users/jamesrosen/.rvm/gems/ree-1.8.7-2011.03/gems/mustache-0.99.3/lib/mustache/context.rb:135:in `[]'
...

I'm using a custom language definition:

Rocco::COMMENT_STYLES['double-rb'] = {
  :single => "##",
  :multi  => { :start => '=begin', :middle => nil, :end => '=end' }
}

This allows me to differentiate between public API (## lines) and private API (# lines). Otherwise, nothing remarkable.

[jamesarosen]

Adding code ||= '' to Rocco::Layout#sections fixes the problem, but I bet there's an underlying cause I'm not seeing.

[Wilfred]

I'm seeing the same issue with some Python files I'm running Rocco on. The simplest test case I could find was:

""":
"""
f

[jamesarosen]

Possibly the same as #40

[zpatten]

/home/zpatten/.rvm/gems/ree-1.8.7-2011.03/gems/rocco-0.7/lib/rocco/layout.rb:30:in `sections': undefined method `empty?' for nil:NilClass (NoMethodError)
    from /home/zpatten/.rvm/gems/ree-1.8.7-2011.03/gems/rocco-0.7/lib/rocco/layout.rb:20:in `map'
    from /home/zpatten/.rvm/gems/ree-1.8.7-2011.03/gems/rocco-0.7/lib/rocco/layout.rb:20:in `sections'
    from /home/zpatten/.rvm/gems/ree-1.8.7-2011.03/gems/mustache-0.99.4/lib/mustache/context.rb:135:in `[]'

I'm seeing this issue with some Ruby files in a Rails lib folder. Default Rocco, no customization.

[rtomayko]

Did this commit fix the issue for you guys?

4c4ef24

I'm shipping out an 0.8 release that includes it now.

[jamesarosen]

Sadly, I can't say for sure. We had to remove Rocco because it kept causing the following error in our application (see #45):

ArgumentError: wrong number of arguments (0 for 1)
[PROJECT_ROOT]/vendor/bundle/ruby/1.8/gems/activerecord-2.3.10/lib/active_record/named_scope.rb, line 186

We tried moving Rocco to its own bundler group, but that didn't help.

[zpatten]

I encountered this error running against our (large) code base. This completely resolved the issue for us.

[Wilfred]

No, the issue remains. The test case I gave above still produces the error.