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module ActionView
module CompiledTemplates #:nodoc:
# holds compiled template code
end
# = Action View Context
#
# Action View contexts are supplied to Action Controller to render template.
# The default Action View context is ActionView::Base.
#
# In order to work with ActionController, a Context must just include this module.
# The initialization of the variables used by the context (@output_buffer, @view_flow,
# and @virtual_path) is responsibility of the object that includes this module.
module Context
include CompiledTemplates
attr_accessor :output_buffer, :view_flow
# TODO Provide an easy method that initializes all variables?
# Returns the contents that are yielded to a layout, given a name or a block.
#
# You can think of a layout as a method that is called with a block. If the user calls
# <tt>yield :some_name</tt>, the block, by default, returns <tt>content_for(:some_name)</tt>.
# If the user calls simply +yield+, the default block returns <tt>content_for(:layout)</tt>.
#
# The user can override this default by passing a block to the layout:
#
# # The template
# <%= render :layout => "my_layout" do %>
# Content
# <% end %>
#
# # The layout
# <html>
# <%= yield %>
# </html>
#
# In this case, instead of the default block, which would return <tt>content_for(:layout)</tt>,
# this method returns the block that was passed in to <tt>render :layout</tt>, and the response
# would be
#
# <html>
# Content
# </html>
#
# Finally, the block can take block arguments, which can be passed in by +yield+:
#
# # The template
# <%= render :layout => "my_layout" do |customer| %>
# Hello <%= customer.name %>
# <% end %>
#
# # The layout
# <html>
# <%= yield Struct.new(:name).new("David") %>
# </html>
#
# In this case, the layout would receive the block passed into <tt>render :layout</tt>,
# and the struct specified would be passed into the block as an argument. The result
# would be
#
# <html>
# Hello David
# </html>
#
def _layout_for(*args, &block)
name = args.first
if name.is_a?(Symbol)
view_flow.get(name).html_safe
elsif block
# TODO Import capture into AV::Context or
# leave it as implicit dependency?
capture(*args, &block)
else
view_flow.get(:layout).html_safe
end
end
end
end
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