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