class SparkEngine::BlockHelper
Attributes
current_helper[RW]
current_parent_block_helper[RW]
helper[W]
parent[W]
Public Class Methods
inherited(klass)
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# File lib/spark_engine/helpers/block_helper.rb, line 10 def inherited(klass) # Define the helper method # e.g. for a class: # class HelloHelper < BlockHelpers::Base # #..... # end # # then we define a helper method 'hello_helper' # method_name = klass.name.split('::').last.underscore klass.parent.class_eval %( def #{method_name}(*args, &block) # Get the current helper object which has all the normal helper methods if self.is_a?(SparkEngine::BlockHelper) top_level_helper = self.helper parent_block_helper = self else top_level_helper = self parent_block_helper = nil end # We need to save the current helper and parent block helper in the class so that # it's visible to the renderer's 'initialize' method... #{klass.name}.current_helper = top_level_helper #{klass.name}.current_parent_block_helper = parent_block_helper renderer = #{klass.name}.new(*args) # ...then set them anyway on the renderer so that renderer methods can use it renderer.send(:helper=, top_level_helper) renderer.send(:parent=, parent_block_helper) body = block ? capture(renderer, &block) : nil if processed_body = renderer.display(body) return processed_body end end ) end
Public Instance Methods
display(body)
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# File lib/spark_engine/helpers/block_helper.rb, line 55 def display(body) body end
respond_to?(method, include_all = false)
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Calls superclass method
# File lib/spark_engine/helpers/block_helper.rb, line 59 def respond_to?(method, include_all = false) super or helper.respond_to?(method, include_all) end
Protected Instance Methods
capture(*args) { |*args| ... }
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# File lib/spark_engine/helpers/block_helper.rb, line 85 def capture(*args) # ActiveSupport 3.1 breaks capture method (defines it on all objects) # so we have to resort to rewrite it value = nil buffer = with_output_buffer { value = yield(*args) } if string = buffer.presence || value and string.is_a?(String) ERB::Util.html_escape string end end
helper()
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# File lib/spark_engine/helpers/block_helper.rb, line 72 def helper @helper ||= self.class.current_helper end
method_missing(method, *args, &block)
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Calls superclass method
# File lib/spark_engine/helpers/block_helper.rb, line 76 def method_missing(method, *args, &block) if helper.respond_to?(method) self.class_eval "def #{method}(*args, &block); helper.send('#{method}', *args, &block); end" self.send(method, *args, &block) else super end end
parent()
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For nested block helpers
# File lib/spark_engine/helpers/block_helper.rb, line 68 def parent @parent ||= self.class.current_parent_block_helper end