Bump version

Conflicts:
	lib/liquid/variable.rb

History.md

@@ -1,5 +1,13 @@
 # Liquid Version History
 
+## 2.5.0 / 2013-03-06
+
+* Prevent Object methods from being called on drops
+* Avoid symbol injection from liquid
+* Added break and continue statements
+* Fix filter parser for args without space separators
+* Add support for filter keyword arguments
+
 ## 2.4.0 / 2012-08-03
 
 * Performance improvements
@@ -8,7 +16,7 @@
 * Ruby 1.8, 1.9, and Rubinius compatibility fixes
 * Add support for `quoted['references']` in `tablerow`
 * Add support for Enumerable to `tablerow`
-* `strip\_html` filter removes html comments
+* `strip_html` filter removes html comments
 
 
 ## 2.3.0 / 2011-10-16

Rakefile

@@ -9,7 +9,7 @@ task :default => 'test'
 
 Rake::TestTask.new(:test) do |t|
   t.libs << '.' << 'lib' << 'test'
-  t.pattern = 'test/liquid/**/*_test.rb'
+  t.test_files = FileList['test/liquid/**/*_test.rb']
   t.verbose = false
 end
 
@@ -27,7 +27,7 @@ namespace :benchmark do
 
   desc "Run the liquid benchmark"
   task :run do
-    ruby "performance/benchmark.rb"
+    ruby "./performance/benchmark.rb"
   end
 
 end
@@ -37,12 +37,12 @@ namespace :profile do
 
   desc "Run the liquid profile/performance coverage"
   task :run do
-    ruby "performance/profile.rb"
+    ruby "./performance/profile.rb"
   end
 
   desc "Run KCacheGrind"
   task :grind => :run  do
-    system "kcachegrind /tmp/liquid.rubyprof_calltreeprinter.txt"
+    system "qcachegrind /tmp/liquid.rubyprof_calltreeprinter.txt"
   end
 
 end

lib/liquid.rb

@@ -48,6 +48,7 @@ end
 require 'liquid/drop'
 require 'liquid/extensions'
 require 'liquid/errors'
+require 'liquid/interrupts'
 require 'liquid/strainer'
 require 'liquid/context'
 require 'liquid/tag'

lib/liquid/block.rb

@@ -89,13 +89,27 @@ module Liquid
     end
 
     def render_all(list, context)
-      list.collect do |token|
+      output = []
+      list.each do |token|
+        # Break out if we have any unhanded interrupts.
+        break if context.has_interrupt?
+
         begin
-          token.respond_to?(:render) ? token.render(context) : token
+          # If we get an Interrupt that means the block must stop processing. An
+          # Interrupt is any command that stops block execution such as {% break %} 
+          # or {% continue %}
+          if token.is_a? Continue or token.is_a? Break
+            context.push_interrupt(token.interrupt)
+            break
+          end
+
+          output << (token.respond_to?(:render) ? token.render(context) : token)
         rescue ::StandardError => e
-          context.handle_error(e)
+          output << (context.handle_error(e))
         end
-      end.join
+      end
+
+      output.join
     end
   end
 end

lib/liquid/context.rb

@@ -22,6 +22,8 @@ module Liquid
       @errors         = []
       @rethrow_errors = rethrow_errors
       squash_instance_assigns_with_environments
+
+      @interrupts = []
     end
 
     def strainer
@@ -37,10 +39,26 @@ module Liquid
 
       filters.each do |f|
         raise ArgumentError, "Expected module but got: #{f.class}" unless f.is_a?(Module)
+        Strainer.add_known_filter(f)
         strainer.extend(f)
       end
     end
 
+    # are there any not handled interrupts?
+    def has_interrupt?
+      !@interrupts.empty?
+    end
+
+    # push an interrupt to the stack. this interrupt is considered not handled.
+    def push_interrupt(e)
+      @interrupts.push(e)
+    end
+
+    # pop an interrupt from the stack
+    def pop_interrupt
+      @interrupts.pop
+    end
+
     def handle_error(e)
       errors.push(e)
       raise if @rethrow_errors
@@ -54,11 +72,7 @@ module Liquid
     end
 
     def invoke(method, *args)
-      if strainer.respond_to?(method)
-        strainer.__send__(method, *args)
-      else
-        args.first
-      end
+      strainer.invoke(method, *args)
     end
 
     # Push new local scope on the stack. use <tt>Context#stack</tt> instead

lib/liquid/drop.rb

@@ -1,3 +1,5 @@
+require 'set'
+
 module Liquid
 
   # A drop in liquid is a class which allows you to export DOM like things to liquid.
@@ -22,6 +24,8 @@ module Liquid
   class Drop
     attr_writer :context
 
+    EMPTY_STRING = ''.freeze
+
     # Catch all for the method
     def before_method(method)
       nil
@@ -29,8 +33,8 @@ module Liquid
 
     # called by liquid to invoke a drop
     def invoke_drop(method_or_key)
-      if method_or_key && method_or_key != '' && self.class.public_method_defined?(method_or_key.to_s.to_sym)
-        send(method_or_key.to_s.to_sym)
+      if method_or_key && method_or_key != EMPTY_STRING && self.class.invokable?(method_or_key)
+        send(method_or_key)
       else
         before_method(method_or_key)
       end
@@ -45,5 +49,13 @@ module Liquid
     end
 
     alias :[] :invoke_drop
+
+    private
+
+    # Check for method existence without invoking respond_to?, which creates symbols
+    def self.invokable?(method_name)
+      @invokable_methods ||= Set.new((public_instance_methods - Liquid::Drop.public_instance_methods).map(&:to_s))
+      @invokable_methods.include?(method_name.to_s)
+    end
   end
 end

lib/liquid/errors.rb

@@ -8,4 +8,4 @@ module Liquid
   class StandardError < Error; end
   class SyntaxError < Error; end
   class StackLevelError < Error; end
-end
+end

lib/liquid/interrupts.rb

@@ -0,0 +1,17 @@
+module Liquid
+
+  # An interrupt is any command that breaks processing of a block (ex: a for loop).
+  class Interrupt
+    attr_reader :message
+
+    def initialize(message=nil)
+      @message = message || "interrupt"
+    end
+  end
+
+  # Interrupt that is thrown whenever a {% break %} is called.
+  class BreakInterrupt < Interrupt; end
+
+  # Interrupt that is thrown whenever a {% continue %} is called.
+  class ContinueInterrupt < Interrupt; end
+end

lib/liquid/standardfilters.rb

@@ -93,10 +93,8 @@ module Liquid
     # map/collect on a given property
     def map(input, property)
       ary = [input].flatten
-      if ary.first.respond_to?('[]') and !ary.first[property].nil?
-        ary.map {|e| e[property] }
-      elsif ary.first.respond_to?(property)
-        ary.map {|e| e.send(property) }
+      ary.map do |e|
+        e.respond_to?('[]') ? e[property] : nil
       end
     end
 

lib/liquid/strainer.rb

@@ -2,24 +2,15 @@ require 'set'
 
 module Liquid
 
-  parent_object = if defined? BlankObject
-    BlankObject
-  else
-    Object
-  end
-
   # Strainer is the parent class for the filters system.
-  # New filters are mixed into the strainer class which is then instanciated for each liquid template render run.
+  # New filters are mixed into the strainer class which is then instantiated for each liquid template render run.
   #
-  # One of the strainer's responsibilities is to keep malicious method calls out
-  class Strainer < parent_object #:nodoc:
-    INTERNAL_METHOD = /^__/
-    @@required_methods = Set.new([:__id__, :__send__, :respond_to?, :kind_of?, :extend, :methods, :singleton_methods, :class, :object_id])
-
-    # Ruby 1.9.2 introduces Object#respond_to_missing?, which is invoked by Object#respond_to?
-    @@required_methods << :respond_to_missing? if Object.respond_to? :respond_to_missing?
-
+  # The Strainer only allows method calls defined in filters given to it via Strainer.global_filter,
+  # Context#add_filters or Template.register_filter
+  class Strainer #:nodoc:
     @@filters = {}
+    @@known_filters = Set.new
+    @@known_methods = Set.new
 
     def initialize(context)
       @context = context
@@ -27,28 +18,36 @@ module Liquid
 
     def self.global_filter(filter)
       raise ArgumentError, "Passed filter is not a module" unless filter.is_a?(Module)
+      add_known_filter(filter)
       @@filters[filter.name] = filter
     end
 
+    def self.add_known_filter(filter)
+      unless @@known_filters.include?(filter)
+        @@method_blacklist ||= Set.new(Strainer.instance_methods.map(&:to_s))
+        new_methods = filter.instance_methods.map(&:to_s)
+        new_methods.reject!{ |m| @@method_blacklist.include?(m) }
+        @@known_methods.merge(new_methods)
+        @@known_filters.add(filter)
+      end
+    end
+
     def self.create(context)
       strainer = Strainer.new(context)
       @@filters.each { |k,m| strainer.extend(m) }
       strainer
     end
 
-    def respond_to?(method, include_private = false)
-      method_name = method.to_s
-      return false if method_name =~ INTERNAL_METHOD
-      return false if @@required_methods.include?(method_name)
-      super
+    def invoke(method, *args)
+      if invokable?(method)
+        send(method, *args)
+      else
+        args.first
+      end
     end
 
-    # remove all standard methods from the bucket so circumvent security
-    # problems
-    instance_methods.each do |m|
-      unless @@required_methods.include?(m.to_sym)
-        undef_method m
-      end
+    def invokable?(method)
+      @@known_methods.include?(method.to_s) && respond_to?(method)
     end
   end
 end

lib/liquid/tags/break.rb

@@ -0,0 +1,21 @@
+module Liquid
+
+  # Break tag to be used to break out of a for loop.
+  #
+  # == Basic Usage:
+  #    {% for item in collection %}
+  #      {% if item.condition %}
+  #        {% break %}
+  #      {% endif %}
+  #    {% endfor %}
+  # 
+  class Break < Tag 
+
+    def interrupt
+      BreakInterrupt.new
+    end
+
+  end
+
+  Template.register_tag('break', Break)
+end

lib/liquid/tags/continue.rb

@@ -0,0 +1,21 @@
+module Liquid
+
+  # Continue tag to be used to break out of a for loop.
+  #
+  # == Basic Usage:
+  #    {% for item in collection %}
+  #      {% if item.condition %}
+  #        {% continue %}
+  #      {% endif %}
+  #    {% endfor %}
+  # 
+  class Continue < Tag
+
+    def interrupt
+      ContinueInterrupt.new
+    end
+
+  end
+
+  Template.register_tag('continue', Continue)
+end

lib/liquid/tags/for.rb

@@ -69,7 +69,7 @@ module Liquid
       @nodelist = @else_block = []
     end
   
-    def render(context)        
+    def render(context)       
       context.registers[:for] ||= Hash.new(0)
     
       collection = context[@collection_name]
@@ -101,8 +101,8 @@ module Liquid
       # Store our progress through the collection for the continue flag
       context.registers[:for][@name] = from + segment.length
               
-      context.stack do 
-        segment.each_with_index do |item, index|     
+      context.stack do
+        segment.each_with_index do |item, index|
           context[@variable_name] = item
           context['forloop'] = {
             'name'    => @name,
@@ -115,6 +115,13 @@ module Liquid
             'last'    => (index == length - 1) }
 
           result << render_all(@for_block, context)
+
+          # Handle any interrupts if they exist.
+          if context.has_interrupt?
+            interrupt = context.pop_interrupt
+            break if interrupt.is_a? BreakInterrupt
+            next if interrupt.is_a? ContinueInterrupt
+          end
         end
       end
       result     

lib/liquid/variable.rb

@@ -11,7 +11,7 @@ module Liquid
   #   {{ user | link }}
   #
   class Variable
-    FilterParser = /(?:#{FilterSeparator}|(?:\s*(?!(?:#{FilterSeparator}))(?:#{QuotedFragment}|\S+)\s*)+)/o
+    FilterParser = /(?:#{FilterSeparator}|(?:\s*(?:#{QuotedFragment}|#{ArgumentSeparator})\s*)+)/o
     attr_accessor :filters, :name
 
     def initialize(markup)
@@ -23,10 +23,10 @@ module Liquid
         if match[2].match(/#{FilterSeparator}\s*(.*)/o)
           filters = Regexp.last_match(1).scan(FilterParser)
           filters.each do |f|
-            if matches = f.match(/\s*(\w+)/)
+            if matches = f.match(/\s*(\w+)(?:\s*#{FilterArgumentSeparator}(.*))?/)
               filtername = matches[1]
-              filterargs = f.scan(/(?:#{FilterArgumentSeparator}|#{ArgumentSeparator})\s*(#{QuotedFragment})/o).flatten
-              @filters << [filtername.to_sym, filterargs]
+              filterargs = matches[2].to_s.scan(/(?:\A|#{ArgumentSeparator})\s*((?:\w+\s*\:\s*)?#{QuotedFragment})/o).flatten
+              @filters << [filtername, filterargs]
             end
           end
         end
@@ -36,9 +36,16 @@ module Liquid
     def render(context)
       return '' if @name.nil?
       @filters.inject(context[@name]) do |output, filter|
-        filterargs = filter[1].to_a.collect do |a|
-          context[a]
+        filterargs = []
+        keyword_args = {}
+        filter[1].to_a.each do |a|
+          if matches = a.match(/\A#{TagAttributes}\z/o)
+            keyword_args[matches[1]] = context[matches[2]]
+          else
+            filterargs << context[a]
+          end
         end
+        filterargs << keyword_args unless keyword_args.empty?
         begin
           output = context.invoke(filter[0], output, *filterargs)
         rescue FilterNotFound

liquid.gemspec

@@ -2,7 +2,7 @@
 
 Gem::Specification.new do |s|
   s.name        = "liquid"
-  s.version     = "2.4.0"
+  s.version     = "2.5.1"
   s.platform    = Gem::Platform::RUBY
   s.summary     = "A secure, non-evaling end user template engine with aesthetic markup."
   s.authors     = ["Tobias Luetke"]

performance/benchmark.rb

@@ -5,6 +5,7 @@ require File.dirname(__FILE__) + '/theme_runner'
 profiler = ThemeRunner.new
 
 Benchmark.bmbm do |x|
-  x.report("parse & run:")   { 10.times { profiler.run(false) } }
+  x.report("parse:")   { 100.times { profiler.compile } }
+  x.report("parse & run:")   { 100.times { profiler.run } }
 end
 

performance/profile.rb

@@ -6,14 +6,14 @@ profiler = ThemeRunner.new
 
 puts 'Running profiler...'
 
-results  = profiler.run(true)
+results  = profiler.run
 
 puts 'Success'
 puts
 
 [RubyProf::FlatPrinter, RubyProf::GraphPrinter, RubyProf::GraphHtmlPrinter, RubyProf::CallTreePrinter].each do |klass|
-  filename = (ENV['TMP'] || '/tmp') + (klass.name.include?('Html') ? "/liquid.#{klass.name.downcase}.html" : "/liquid.#{klass.name.downcase}.txt")
+  filename = (ENV['TMP'] || '/tmp') + (klass.name.include?('Html') ? "/liquid.#{klass.name.downcase}.html" : "/callgrind.liquid.#{klass.name.downcase}.txt")
   filename.gsub!(/:+/, '_')
-  File.open(filename, "w+") { |fp| klass.new(results).print(fp) }
+  File.open(filename, "w+") { |fp| klass.new(results).print(fp, :print_file => true) }
   $stderr.puts "wrote #{klass.name} output to #{filename}"
 end

performance/theme_runner.rb

@@ -27,9 +27,34 @@ class ThemeRunner
     end.compact
   end  
 
+  def compile
+    # Dup assigns because will make some changes to them
 
-  def run(profile = false)
-    RubyProf.measure_mode = RubyProf::WALL_TIME if profile
+    @tests.each do |liquid, layout, template_name|
+
+      tmpl = Liquid::Template.new
+      tmpl.parse(liquid)
+      tmpl = Liquid::Template.new
+      tmpl.parse(layout)
+    end
+  end
+
+   def run
+    # Dup assigns because will make some changes to them
+    assigns = Database.tables.dup
+
+    @tests.each do |liquid, layout, template_name|
+
+      # Compute page_tempalte outside of profiler run, uninteresting to profiler
+      page_template = File.basename(template_name, File.extname(template_name))
+      compile_and_render(liquid, layout, assigns, page_template) 
+       
+    end
+  end
+
+
+  def run_profile
+    RubyProf.measure_mode = RubyProf::WALL_TIME
 
     # Dup assigns because will make some changes to them
     assigns = Database.tables.dup
@@ -40,26 +65,27 @@ class ThemeRunner
       html = nil
       page_template = File.basename(template_name, File.extname(template_name))
 
-      # Profile compiling and rendering both
-      
-      if profile
-
-        RubyProf.resume do 
-          html = compile_and_render(liquid, layout, assigns, page_template) 
-        end 
-
-      else
-        html = compile_and_render(liquid, layout, assigns, page_template) 
+      unless @started
+        RubyProf.start
+        RubyProf.pause
+        @started = true
       end
 
+      html = nil
+
+      RubyProf.resume
+      html = compile_and_render(liquid, layout, assigns, page_template) 
+      RubyProf.pause
+      
+
       # return the result and the MD5 of the content, this can be used to detect regressions between liquid version
-      $stdout.puts "* rendered template %s, content: %s" % [template_name, Digest::MD5.hexdigest(html)] if profile
+      $stdout.puts "* rendered template %s, content: %s" % [template_name, Digest::MD5.hexdigest(html)]
  
       # Uncomment to dump html files to /tmp so that you can inspect for errors
       # File.open("/tmp/#{File.basename(template_name)}.html", "w+") { |fp| fp <<html}
     end
 
-    RubyProf.stop if profile
+    RubyProf.stop
   end
 
   def compile_and_render(template, layout, assigns, page_template)    

test/liquid/block_test.rb

@@ -1,6 +1,6 @@
 require 'test_helper'
 
-class VariableTest < Test::Unit::TestCase
+class BlockTest < Test::Unit::TestCase
   include Liquid
 
   def test_blankspace

test/liquid/context_test.rb

@@ -189,10 +189,10 @@ class ContextTest < Test::Unit::TestCase
     end
 
     context = Context.new
-    methods_before = context.strainer.methods.map { |method| method.to_s }
+    assert_equal "Wookie", context.invoke("hi", "Wookie")
+
     context.add_filters(filter)
-    methods_after = context.strainer.methods.map { |method| method.to_s }
-    assert_equal (methods_before + ["hi"]).sort, methods_after.sort
+    assert_equal "Wookie hi!", context.invoke("hi", "Wookie")
   end
 
   def test_add_item_in_outer_scope

test/liquid/drop_test.rb

@@ -71,23 +71,29 @@ class DropsTest < Test::Unit::TestCase
   include Liquid
 
   def test_product_drop
-
     assert_nothing_raised do
       tpl = Liquid::Template.parse( '  '  )
       tpl.render('product' => ProductDrop.new)
     end
   end
 
+  def test_drop_does_only_respond_to_whitelisted_methods
+    assert_equal "", Liquid::Template.parse("{{ product.inspect }}").render('product' => ProductDrop.new)
+    assert_equal "", Liquid::Template.parse("{{ product.pretty_inspect }}").render('product' => ProductDrop.new)
+    assert_equal "", Liquid::Template.parse("{{ product.whatever }}").render('product' => ProductDrop.new)
+    assert_equal "", Liquid::Template.parse('{{ product | map: "inspect" }}').render('product' => ProductDrop.new)
+    assert_equal "", Liquid::Template.parse('{{ product | map: "pretty_inspect" }}').render('product' => ProductDrop.new)
+    assert_equal "", Liquid::Template.parse('{{ product | map: "whatever" }}').render('product' => ProductDrop.new)
+  end
+
   def test_text_drop
     output = Liquid::Template.parse( ' {{ product.texts.text }} '  ).render('product' => ProductDrop.new)
     assert_equal ' text1 ', output
-
   end
 
   def test_unknown_method
     output = Liquid::Template.parse( ' {{ product.catchall.unknown }} '  ).render('product' => ProductDrop.new)
     assert_equal ' method: unknown ', output
-
   end
 
   def test_integer_argument_drop
@@ -115,6 +121,13 @@ class DropsTest < Test::Unit::TestCase
     assert_equal '  ', output
   end
 
+  def test_object_methods_not_allowed
+    [:dup, :clone, :singleton_class, :eval, :class_eval, :inspect].each do |method|
+      output = Liquid::Template.parse(" {{ product.#{method} }} ").render('product' => ProductDrop.new)
+      assert_equal '  ', output
+    end
+  end
+
   def test_scope
     assert_equal '1', Liquid::Template.parse( '{{ context.scopes }}'  ).render('context' => ContextDrop.new)
     assert_equal '2', Liquid::Template.parse( '{%for i in dummy%}{{ context.scopes }}{%endfor%}'  ).render('context' => ContextDrop.new, 'dummy' => [1])

test/liquid/filter_test.rb

@@ -16,6 +16,12 @@ module CanadianMoneyFilter
   end
 end
 
+module SubstituteFilter
+  def substitute(input, params={})
+    input.gsub(/%\{(\w+)\}/) { |match| params[$1] }
+  end
+end
+
 class FiltersTest < Test::Unit::TestCase
   include Liquid
 
@@ -92,6 +98,13 @@ class FiltersTest < Test::Unit::TestCase
 
     assert_equal 1000, Variable.new("var | xyzzy").render(@context)
   end
+
+  def test_filter_with_keyword_arguments
+    @context['surname'] = 'john'
+    @context.add_filters(SubstituteFilter)
+    output = Variable.new(%! 'hello %{first_name}, %{last_name}' | substitute: first_name: surname, last_name: 'doe' !).render(@context)
+    assert_equal 'hello john, doe', output
+  end
 end
 
 class FiltersInTemplate < Test::Unit::TestCase

test/liquid/security_test.rb

@@ -38,4 +38,27 @@ class SecurityTest < Test::Unit::TestCase
 
     assert_equal expected, Template.parse(text).render(@assigns, :filters => SecurityFilter)
   end
+
+  def test_does_not_add_filters_to_symbol_table
+    current_symbols = Symbol.all_symbols
+
+    test = %( {{ "some_string" | a_bad_filter }} )
+
+    template = Template.parse(test)
+    assert_equal [], (Symbol.all_symbols - current_symbols)
+
+    template.render
+    assert_equal [], (Symbol.all_symbols - current_symbols)
+  end
+
+  def test_does_not_add_drop_methods_to_symbol_table
+    current_symbols = Symbol.all_symbols
+
+    drop = Drop.new
+    drop.invoke_drop("custom_method_1")
+    drop.invoke_drop("custom_method_2")
+    drop.invoke_drop("custom_method_3")
+
+    assert_equal [], (Symbol.all_symbols - current_symbols)
+  end
 end # SecurityTest

test/liquid/standard_filter_test.rb

@@ -86,6 +86,11 @@ class StandardFiltersTest < Test::Unit::TestCase
       'ary' => [{'foo' => {'bar' => 'a'}}, {'foo' => {'bar' => 'b'}}, {'foo' => {'bar' => 'c'}}]
   end
 
+  def test_map_doesnt_call_arbitrary_stuff
+    assert_equal "", Liquid::Template.parse('{{ "foo" | map: "__id__" }}').render
+    assert_equal "", Liquid::Template.parse('{{ "foo" | map: "inspect" }}').render
+  end
+
   def test_date
     assert_equal 'May', @filters.date(Time.parse("2006-05-05 10:00:00"), "%B")
     assert_equal 'June', @filters.date(Time.parse("2006-06-05 10:00:00"), "%B")

test/liquid/strainer_test.rb

@@ -3,23 +3,50 @@ require 'test_helper'
 class StrainerTest < Test::Unit::TestCase
   include Liquid
 
+  module AccessScopeFilters
+    def public_filter
+      "public"
+    end
+
+    def private_filter
+      "private"
+    end
+    private :private_filter
+  end
+
+  Strainer.global_filter(AccessScopeFilters)
+
   def test_strainer
     strainer = Strainer.create(nil)
-    assert_equal false, strainer.respond_to?('__test__')
-    assert_equal false, strainer.respond_to?('test')
-    assert_equal false, strainer.respond_to?('instance_eval')
-    assert_equal false, strainer.respond_to?('__send__')
-    assert_equal true, strainer.respond_to?('size') # from the standard lib
+    assert_equal 5, strainer.invoke('size', 'input')
+    assert_equal "public", strainer.invoke("public_filter")
   end
 
-  def test_should_respond_to_two_parameters
+  def test_strainer_only_invokes_public_filter_methods
     strainer = Strainer.create(nil)
-    assert_equal true, strainer.respond_to?('size', false)
+    assert_equal false, strainer.invokable?('__test__')
+    assert_equal false, strainer.invokable?('test')
+    assert_equal false, strainer.invokable?('instance_eval')
+    assert_equal false, strainer.invokable?('__send__')
+    assert_equal true, strainer.invokable?('size') # from the standard lib
   end
 
-  # Asserts that Object#respond_to_missing? is not being undefined in Ruby versions where it has been implemented
-  # Currently this method is only present in Ruby v1.9.2, or higher
-  def test_object_respond_to_missing
-    assert_equal Object.respond_to?(:respond_to_missing?), Strainer.create(nil).respond_to?(:respond_to_missing?)
+  def test_strainer_returns_nil_if_no_filter_method_found
+    strainer = Strainer.create(nil)
+    assert_nil strainer.invoke("private_filter")
+    assert_nil strainer.invoke("undef_the_filter")
   end
+
+  def test_strainer_returns_first_argument_if_no_method_and_arguments_given
+    strainer = Strainer.create(nil)
+    assert_equal "password", strainer.invoke("undef_the_method", "password")
+  end
+
+  def test_strainer_only_allows_methods_defined_in_filters
+    strainer = Strainer.create(nil)
+    assert_equal "1 + 1", strainer.invoke("instance_eval", "1 + 1")
+    assert_equal "puts",  strainer.invoke("__send__", "puts", "Hi Mom")
+    assert_equal "has_method?", strainer.invoke("invoke", "has_method?", "invoke")
+  end
+
 end # StrainerTest

test/liquid/tags/break_tag_test.rb

@@ -0,0 +1,16 @@
+require 'test_helper'
+
+class BreakTagTest < Test::Unit::TestCase
+  include Liquid
+
+  # tests that no weird errors are raised if break is called outside of a
+  # block
+  def test_break_with_no_block
+    assigns = {'i' => 1}
+    markup = '{% break %}'
+    expected = ''
+
+    assert_template_result(expected, markup, assigns)
+  end
+
+end

test/liquid/tags/continue_tag_test.rb

@@ -0,0 +1,16 @@
+require 'test_helper'
+
+class ContinueTagTest < Test::Unit::TestCase
+  include Liquid
+
+  # tests that no weird errors are raised if continue is called outside of a
+  # block
+  def test_continue_with_no_block
+    assigns = {}
+    markup = '{% continue %}'
+    expected = ''
+
+    assert_template_result(expected, markup, assigns)
+  end
+
+end

test/liquid/tags/for_tag_test.rb

@@ -168,6 +168,88 @@ HERE
       assert_template_result(expected,markup,assigns)
   end
 
+  def test_for_with_break
+    assigns = {'array' => {'items' => [1,2,3,4,5,6,7,8,9,10]}}
+
+    markup = '{% for i in array.items %}{% break %}{% endfor %}'
+    expected = ""
+    assert_template_result(expected,markup,assigns)
+
+    markup = '{% for i in array.items %}{{ i }}{% break %}{% endfor %}'
+    expected = "1"
+    assert_template_result(expected,markup,assigns)
+
+    markup = '{% for i in array.items %}{% break %}{{ i }}{% endfor %}'
+    expected = ""
+    assert_template_result(expected,markup,assigns)
+
+    markup = '{% for i in array.items %}{{ i }}{% if i > 3 %}{% break %}{% endif %}{% endfor %}'
+    expected = "1234"
+    assert_template_result(expected,markup,assigns)
+
+    # tests to ensure it only breaks out of the local for loop 
+    # and not all of them.
+    assigns = {'array' => [[1,2],[3,4],[5,6]] }
+    markup = '{% for item in array %}' + 
+               '{% for i in item %}' + 
+                 '{% if i == 1 %}' + 
+                   '{% break %}' + 
+                 '{% endif %}' + 
+                 '{{ i }}' + 
+               '{% endfor %}' + 
+             '{% endfor %}'
+    expected = '3456'
+    assert_template_result(expected, markup, assigns)
+
+    # test break does nothing when unreached
+    assigns = {'array' => {'items' => [1,2,3,4,5]}}
+    markup = '{% for i in array.items %}{% if i == 9999 %}{% break %}{% endif %}{{ i }}{% endfor %}'
+    expected = '12345'
+    assert_template_result(expected, markup, assigns)
+  end
+
+  def test_for_with_continue
+    assigns = {'array' => {'items' => [1,2,3,4,5]}}
+
+    markup = '{% for i in array.items %}{% continue %}{% endfor %}'
+    expected = ""
+    assert_template_result(expected,markup,assigns) 
+
+    markup = '{% for i in array.items %}{{ i }}{% continue %}{% endfor %}'
+    expected = "12345"
+    assert_template_result(expected,markup,assigns) 
+
+    markup = '{% for i in array.items %}{% continue %}{{ i }}{% endfor %}'
+    expected = ""
+    assert_template_result(expected,markup,assigns) 
+
+    markup = '{% for i in array.items %}{% if i > 3 %}{% continue %}{% endif %}{{ i }}{% endfor %}'
+    expected = "123"
+    assert_template_result(expected,markup,assigns)
+
+    markup = '{% for i in array.items %}{% if i == 3 %}{% continue %}{% else %}{{ i }}{% endif %}{% endfor %}'
+    expected = "1245"
+    assert_template_result(expected,markup,assigns)
+
+    # tests to ensure it only continues the local for loop and not all of them.
+    assigns = {'array' => [[1,2],[3,4],[5,6]] }
+    markup = '{% for item in array %}' + 
+               '{% for i in item %}' + 
+                 '{% if i == 1 %}' + 
+                   '{% continue %}' + 
+                 '{% endif %}' + 
+                 '{{ i }}' + 
+               '{% endfor %}' + 
+             '{% endfor %}'
+    expected = '23456'
+    assert_template_result(expected, markup, assigns)
+
+    # test continue does nothing when unreached
+    assigns = {'array' => {'items' => [1,2,3,4,5]}}
+    markup = '{% for i in array.items %}{% if i == 9999 %}{% continue %}{% endif %}{{ i }}{% endfor %}'
+    expected = '12345'
+    assert_template_result(expected, markup, assigns)
+  end
 
   def test_for_tag_string
     # ruby 1.8.7 "String".each => Enumerator with single "String" element.

test/liquid/variable_test.rb

@@ -11,67 +11,71 @@ class VariableTest < Test::Unit::TestCase
   def test_filters
     var = Variable.new('hello | textileze')
     assert_equal 'hello', var.name
-    assert_equal [[:textileze,[]]], var.filters
+    assert_equal [["textileze",[]]], var.filters
 
     var = Variable.new('hello | textileze | paragraph')
     assert_equal 'hello', var.name
-    assert_equal [[:textileze,[]], [:paragraph,[]]], var.filters
+    assert_equal [["textileze",[]], ["paragraph",[]]], var.filters
 
     var = Variable.new(%! hello | strftime: '%Y'!)
     assert_equal 'hello', var.name
-    assert_equal [[:strftime,["'%Y'"]]], var.filters
+    assert_equal [["strftime",["'%Y'"]]], var.filters
 
     var = Variable.new(%! 'typo' | link_to: 'Typo', true !)
     assert_equal %!'typo'!, var.name
-    assert_equal [[:link_to,["'Typo'", "true"]]], var.filters
+    assert_equal [["link_to",["'Typo'", "true"]]], var.filters
 
     var = Variable.new(%! 'typo' | link_to: 'Typo', false !)
     assert_equal %!'typo'!, var.name
-    assert_equal [[:link_to,["'Typo'", "false"]]], var.filters
+    assert_equal [["link_to",["'Typo'", "false"]]], var.filters
 
     var = Variable.new(%! 'foo' | repeat: 3 !)
     assert_equal %!'foo'!, var.name
-    assert_equal [[:repeat,["3"]]], var.filters
+    assert_equal [["repeat",["3"]]], var.filters
 
     var = Variable.new(%! 'foo' | repeat: 3, 3 !)
     assert_equal %!'foo'!, var.name
-    assert_equal [[:repeat,["3","3"]]], var.filters
+    assert_equal [["repeat",["3","3"]]], var.filters
 
     var = Variable.new(%! 'foo' | repeat: 3, 3, 3 !)
     assert_equal %!'foo'!, var.name
-    assert_equal [[:repeat,["3","3","3"]]], var.filters
+    assert_equal [["repeat",["3","3","3"]]], var.filters
 
     var = Variable.new(%! hello | strftime: '%Y, okay?'!)
     assert_equal 'hello', var.name
-    assert_equal [[:strftime,["'%Y, okay?'"]]], var.filters
+    assert_equal [["strftime",["'%Y, okay?'"]]], var.filters
 
     var = Variable.new(%! hello | things: "%Y, okay?", 'the other one'!)
     assert_equal 'hello', var.name
-    assert_equal [[:things,["\"%Y, okay?\"","'the other one'"]]], var.filters
+    assert_equal [["things",["\"%Y, okay?\"","'the other one'"]]], var.filters
   end
 
   def test_filter_with_date_parameter
 
     var = Variable.new(%! '2006-06-06' | date: "%m/%d/%Y"!)
     assert_equal "'2006-06-06'", var.name
-    assert_equal [[:date,["\"%m/%d/%Y\""]]], var.filters
+    assert_equal [["date",["\"%m/%d/%Y\""]]], var.filters
 
   end
 
   def test_filters_without_whitespace
     var = Variable.new('hello | textileze | paragraph')
     assert_equal 'hello', var.name
-    assert_equal [[:textileze,[]], [:paragraph,[]]], var.filters
+    assert_equal [["textileze",[]], ["paragraph",[]]], var.filters
 
     var = Variable.new('hello|textileze|paragraph')
     assert_equal 'hello', var.name
-    assert_equal [[:textileze,[]], [:paragraph,[]]], var.filters
+    assert_equal [["textileze",[]], ["paragraph",[]]], var.filters
+
+    var = Variable.new("hello|replace:'foo','bar'|textileze")
+    assert_equal 'hello', var.name
+    assert_equal [["replace", ["'foo'", "'bar'"]], ["textileze", []]], var.filters
   end
 
   def test_symbol
     var = Variable.new("http://disney.com/logo.gif | image: 'med' ")
     assert_equal 'http://disney.com/logo.gif', var.name
-    assert_equal [[:image,["'med'"]]], var.filters
+    assert_equal [["image",["'med'"]]], var.filters
   end
 
   def test_string_single_quoted
@@ -103,6 +107,12 @@ class VariableTest < Test::Unit::TestCase
     var = Variable.new(%| test.test |)
     assert_equal 'test.test', var.name
   end
+
+  def test_filter_with_keyword_arguments
+    var = Variable.new(%! hello | things: greeting: "world", farewell: 'goodbye'!)
+    assert_equal 'hello', var.name
+    assert_equal [['things',["greeting: \"world\"","farewell: 'goodbye'"]]], var.filters
+  end
 end