Drop support for Rails 3.0 and 3.1

Rails 3.0 and 3.1 are no longer supported, matching the official
Maintenance Policy for Ruby on Rails.

See
http://weblog.rubyonrails.org/2013/2/24/maintenance-policy-for-ruby-on-r
ails/

* Remove Rails 3.0 and 3.1 Gemfiles.
* Remove Rails 3.0 and 3.1 from the Travis build matrix.
* Require Rails >= 3.2 in the gemspec.
* The Haml::Plugin class does not need to inherit from anything.

.travis.yml

@@ -6,30 +6,18 @@ rvm:
   - jruby
   - rbx-19mode
 gemfile:
-  - test/gemfiles/Gemfile.rails-3.0.x
-  - test/gemfiles/Gemfile.rails-3.1.x
   - test/gemfiles/Gemfile.rails-3.2.x
   - test/gemfiles/Gemfile.rails-4.0.x
 matrix:
   exclude:
     # Don't kill Travis: just test against the latest version on 2.0, JRuby
     # and Rubinius.
-    - { rvm: jruby, gemfile: test/gemfiles/Gemfile.rails-3.0.x }
-    - { rvm: jruby, gemfile: test/gemfiles/Gemfile.rails-3.1.x }
     - { rvm: jruby, gemfile: test/gemfiles/Gemfile.rails-3.2.x }
-
-    - { rvm: rbx-19mode, gemfile: test/gemfiles/Gemfile.rails-3.0.x }
-    - { rvm: rbx-19mode, gemfile: test/gemfiles/Gemfile.rails-3.1.x }
     - { rvm: rbx-19mode, gemfile: test/gemfiles/Gemfile.rails-3.2.x }
 
     - { rvm: 1.9.2, gemfile: test/gemfiles/Gemfile.rails-4.0.x }
 
-    - { rvm: 2.0.0, gemfile: test/gemfiles/Gemfile.rails-3.0.x }
-    - { rvm: 2.0.0, gemfile: test/gemfiles/Gemfile.rails-3.1.x }
     - { rvm: 2.0.0, gemfile: test/gemfiles/Gemfile.rails-3.2.x }
-
-    - { rvm: 2.1.0, gemfile: test/gemfiles/Gemfile.rails-3.0.x }
-    - { rvm: 2.1.0, gemfile: test/gemfiles/Gemfile.rails-3.1.x }
     - { rvm: 2.1.0, gemfile: test/gemfiles/Gemfile.rails-3.2.x }
 
   allow_failures:

CHANGELOG.md

@@ -3,6 +3,9 @@
 ## 4.1.0 (Unreleased)
 
 * Haml now requires Ruby 1.9.2 or above.
+* Rails 3.0 and 3.1 are no longer supported, matching the official
+  [Maintenance Policy for Ruby on Rails](http://weblog.rubyonrails.org/2013/2/24/maintenance-policy-for-ruby-on-rails/).
+  (Tee Parham)
 * Fix for attribute merging. When an attribute method (or literal nested hash)
   was used in an old style attribute hash and there is also a (non-static) new
   style hash there is an error. The fix can result in different behavior in

haml.gemspec

@@ -21,7 +21,7 @@ Gem::Specification.new do |spec|
 
   spec.add_dependency 'tilt'
 
-  spec.add_development_dependency 'rails', '>= 3.0.0'
+  spec.add_development_dependency 'rails', '>= 3.2.0'
   spec.add_development_dependency 'rbench'
   spec.add_development_dependency 'minitest', '~> 4.0'
   spec.add_development_dependency 'nokogiri', '~> 1.6.0'

lib/haml/helpers/action_view_mods.rb

@@ -42,12 +42,7 @@ module ActionView
           #double assignment is to avoid warnings
           _hamlout = _hamlout = eval('_hamlout', block.binding) # Necessary since capture_haml checks _hamlout
 
-          str = capture_haml(*args, &block)
-
-          # NonCattingString is present in Rails less than 3.1.0. When support
-          # for 3.0 is dropped, this can be removed.
-          return ActionView::NonConcattingString.new(str) if str && defined?(ActionView::NonConcattingString)
-          return str
+          capture_haml(*args, &block)
         else
           capture_without_haml(*args, &block)
         end

lib/haml/template/plugin.rb

@@ -1,17 +1,7 @@
 module Haml
 
   # This module makes Haml work with Rails using the template handler API.
-  class Plugin < ActionView::Template::Handlers::ERB.superclass
-
-    # Rails 3.1+, template handlers don't inherit from anything. In <= 3.0, they
-    # do. To avoid messy logic figuring this out, we just inherit from whatever
-    # the ERB handler does.
-
-    # In Rails 3.1+, we don't need to include Compilable.
-    if (ActionPack::VERSION::MAJOR == 3) && (ActionPack::VERSION::MINOR < 1)
-      include ActionView::Template::Handlers::Compilable
-    end
-
+  class Plugin
     def handles_encoding?; true; end
 
     def compile(template)
@@ -25,7 +15,6 @@ module Haml
       Haml::Engine.new(template.source, options).compiler.precompiled_with_ambles([])
     end
 
-    # In Rails 3.1+, #call takes the place of #compile
     def self.call(template)
       new.compile(template)
     end

lib/haml/util.rb

@@ -56,17 +56,13 @@ module Haml
       $stderr = the_real_stderr
     end
 
-    # Returns an ActionView::Template* class.
-    # In pre-3.0 versions of Rails, most of these classes
-    # were of the form `ActionView::TemplateFoo`,
-    # while afterwards they were of the form `ActionView::Template::Foo`.
+    # Returns an ActionView::Template::* class.
+    # These classes are of the form `ActionView::Template::Foo`.
     #
     # @param name [#to_s] The name of the class to get.
-    #   For example, `:Error` will return `ActionView::TemplateError`
-    #   or `ActionView::Template::Error`.
+    #   For example, `:Error` will return `ActionView::Template::Error`.
     def av_template_class(name)
-      return ActionView.const_get("Template#{name}") if ActionView.const_defined?("Template#{name}")
-      return ActionView::Template.const_get(name.to_s)
+      ActionView::Template.const_get(name.to_s)
     end
 
     ## Rails XSS Safety

test/gemfiles/Gemfile.rails-3.0.x

@@ -1,4 +0,0 @@
-source "https://rubygems.org"
-
-gem 'rails', '~> 3.0.0'
-gemspec :path => "../.."

test/gemfiles/Gemfile.rails-3.1.x

@@ -1,4 +0,0 @@
-source "https://rubygems.org"
-
-gem 'rails', '~> 3.1.0'
-gemspec :path => "../.."

test/helper_test.rb

@@ -34,12 +34,6 @@ class HelperTest < MiniTest::Unit::TestCase
     @base = ActionView::Base.new
     @base.controller = ActionController::Base.new
     @base.view_paths << File.expand_path("../templates", __FILE__)
-
-    if defined?(ActionController::Response)
-      # This is needed for >=3.0.0
-      @base.controller.response = ActionController::Response.new
-    end
-
     @base.instance_variable_set('@post', Post.new("Foo bar\nbaz", nil, PostErrors.new))
   end