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-require 'active_support/core_ext/module/attr_internal'
-require 'active_support/core_ext/class/attribute_accessors'
-require 'active_support/ordered_options'
-require 'action_view/log_subscriber'
-
-module ActionView #:nodoc:
- # = Action View Base
- #
- # Action View templates can be written in several ways. If the template file has a <tt>.erb</tt> extension then it uses a mixture of ERB
- # (included in Ruby) and HTML. If the template file has a <tt>.builder</tt> extension then Jim Weirich's Builder::XmlMarkup library is used.
- #
- # == ERB
- #
- # You trigger ERB by using embeddings such as <% %>, <% -%>, and <%= %>. The <%= %> tag set is used when you want output. Consider the
- # following loop for names:
- #
- # <b>Names of all the people</b>
- # <% @people.each do |person| %>
- # Name: <%= person.name %><br/>
- # <% end %>
- #
- # The loop is setup in regular embedding tags <% %> and the name is written using the output embedding tag <%= %>. Note that this
- # is not just a usage suggestion. Regular output functions like print or puts won't work with ERB templates. So this would be wrong:
- #
- # <%# WRONG %>
- # Hi, Mr. <% puts "Frodo" %>
- #
- # If you absolutely must write from within a function use +concat+.
- #
- # <%- and -%> suppress leading and trailing whitespace, including the trailing newline, and can be used interchangeably with <% and %>.
- #
- # === Using sub templates
- #
- # Using sub templates allows you to sidestep tedious replication and extract common display structures in shared templates. The
- # classic example is the use of a header and footer (even though the Action Pack-way would be to use Layouts):
- #
- # <%= render "shared/header" %>
- # Something really specific and terrific
- # <%= render "shared/footer" %>
- #
- # As you see, we use the output embeddings for the render methods. The render call itself will just return a string holding the
- # result of the rendering. The output embedding writes it to the current template.
- #
- # But you don't have to restrict yourself to static includes. Templates can share variables amongst themselves by using instance
- # variables defined using the regular embedding tags. Like this:
- #
- # <% @page_title = "A Wonderful Hello" %>
- # <%= render "shared/header" %>
- #
- # Now the header can pick up on the <tt>@page_title</tt> variable and use it for outputting a title tag:
- #
- # <title><%= @page_title %></title>
- #
- # === Passing local variables to sub templates
- #
- # You can pass local variables to sub templates by using a hash with the variable names as keys and the objects as values:
- #
- # <%= render "shared/header", { headline: "Welcome", person: person } %>
- #
- # These can now be accessed in <tt>shared/header</tt> with:
- #
- # Headline: <%= headline %>
- # First name: <%= person.first_name %>
- #
- # If you need to find out whether a certain local variable has been assigned a value in a particular render call,
- # you need to use the following pattern:
- #
- # <% if local_assigns.has_key? :headline %>
- # Headline: <%= headline %>
- # <% end %>
- #
- # Testing using <tt>defined? headline</tt> will not work. This is an implementation restriction.
- #
- # === Template caching
- #
- # By default, Rails will compile each template to a method in order to render it. When you alter a template,
- # Rails will check the file's modification time and recompile it in development mode.
- #
- # == Builder
- #
- # Builder templates are a more programmatic alternative to ERB. They are especially useful for generating XML content. An XmlMarkup object
- # named +xml+ is automatically made available to templates with a <tt>.builder</tt> extension.
- #
- # Here are some basic examples:
- #
- # xml.em("emphasized") # => <em>emphasized</em>
- # xml.em { xml.b("emph & bold") } # => <em><b>emph &amp; bold</b></em>
- # xml.a("A Link", "href" => "http://onestepback.org") # => <a href="http://onestepback.org">A Link</a>
- # xml.target("name" => "compile", "option" => "fast") # => <target option="fast" name="compile"\>
- # # NOTE: order of attributes is not specified.
- #
- # Any method with a block will be treated as an XML markup tag with nested markup in the block. For example, the following:
- #
- # xml.div do
- # xml.h1(@person.name)
- # xml.p(@person.bio)
- # end
- #
- # would produce something like:
- #
- # <div>
- # <h1>David Heinemeier Hansson</h1>
- # <p>A product of Danish Design during the Winter of '79...</p>
- # </div>
- #
- # A full-length RSS example actually used on Basecamp:
- #
- # xml.rss("version" => "2.0", "xmlns:dc" => "http://purl.org/dc/elements/1.1/") do
- # xml.channel do
- # xml.title(@feed_title)
- # xml.link(@url)
- # xml.description "Basecamp: Recent items"
- # xml.language "en-us"
- # xml.ttl "40"
- #
- # @recent_items.each do |item|
- # xml.item do
- # xml.title(item_title(item))
- # xml.description(item_description(item)) if item_description(item)
- # xml.pubDate(item_pubDate(item))
- # xml.guid(@person.firm.account.url + @recent_items.url(item))
- # xml.link(@person.firm.account.url + @recent_items.url(item))
- #
- # xml.tag!("dc:creator", item.author_name) if item_has_creator?(item)
- # end
- # end
- # end
- # end
- #
- # More builder documentation can be found at http://builder.rubyforge.org.
- class Base
- include Helpers, ::ERB::Util, Context
-
- # Specify the proc used to decorate input tags that refer to attributes with errors.
- cattr_accessor :field_error_proc
- @@field_error_proc = Proc.new{ |html_tag, instance| "<div class=\"field_with_errors\">#{html_tag}</div>".html_safe }
-
- # How to complete the streaming when an exception occurs.
- # This is our best guess: first try to close the attribute, then the tag.
- cattr_accessor :streaming_completion_on_exception
- @@streaming_completion_on_exception = %("><script>window.location = "/500.html"</script></html>)
-
- # Specify whether rendering within namespaced controllers should prefix
- # the partial paths for ActiveModel objects with the namespace.
- # (e.g., an Admin::PostsController would render @post using /admin/posts/_post.erb)
- cattr_accessor :prefix_partial_path_with_controller_namespace
- @@prefix_partial_path_with_controller_namespace = true
-
- # Specify default_formats that can be rendered.
- cattr_accessor :default_formats
-
- class_attribute :_routes
- class_attribute :logger
-
- class << self
- delegate :erb_trim_mode=, :to => 'ActionView::Template::Handlers::ERB'
-
- def cache_template_loading
- ActionView::Resolver.caching?
- end
-
- def cache_template_loading=(value)
- ActionView::Resolver.caching = value
- end
-
- def xss_safe? #:nodoc:
- true
- end
- end
-
- attr_accessor :view_renderer
- attr_internal :config, :assigns
-
- delegate :lookup_context, :to => :view_renderer
- delegate :formats, :formats=, :locale, :locale=, :view_paths, :view_paths=, :to => :lookup_context
-
- def assign(new_assigns) # :nodoc:
- @_assigns = new_assigns.each { |key, value| instance_variable_set("@#{key}", value) }
- end
-
- def initialize(context = nil, assigns = {}, controller = nil, formats = nil) #:nodoc:
- @_config = ActiveSupport::InheritableOptions.new
-
- if context.is_a?(ActionView::Renderer)
- @view_renderer = context
- else
- lookup_context = context.is_a?(ActionView::LookupContext) ?
- context : ActionView::LookupContext.new(context)
- lookup_context.formats = formats if formats
- lookup_context.prefixes = controller._prefixes if controller
- @view_renderer = ActionView::Renderer.new(lookup_context)
- end
-
- assign(assigns)
- assign_controller(controller)
- _prepare_context
- end
-
- ActiveSupport.run_load_hooks(:action_view, self)
- end
-end