mirror of
https://github.com/rails/rails.git
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227 lines
9.3 KiB
Ruby
227 lines
9.3 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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module ActionView #:nodoc:
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class NonConcattingString < ActiveSupport::SafeBuffer
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end
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# Action View templates can be written in three 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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# If the template file has a <tt>.rjs</tt> extension then it will use ActionView::Helpers::PrototypeHelper::JavaScriptGenerator.
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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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# <% for person in @people %>
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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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# Hi, Mr. <% puts "Frodo" %>
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#
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# If you absolutely must write from within a function, you can use the TextHelper#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, Rails will
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# check the file's modification time and recompile it.
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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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#
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# == JavaScriptGenerator
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#
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# JavaScriptGenerator templates end in <tt>.rjs</tt>. Unlike conventional templates which are used to
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# render the results of an action, these templates generate instructions on how to modify an already rendered page. This makes it easy to
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# modify multiple elements on your page in one declarative Ajax response. Actions with these templates are called in the background with Ajax
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# and make updates to the page where the request originated from.
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#
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# An instance of the JavaScriptGenerator object named +page+ is automatically made available to your template, which is implicitly wrapped in an ActionView::Helpers::PrototypeHelper#update_page block.
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#
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# When an <tt>.rjs</tt> action is called with +link_to_remote+, the generated JavaScript is automatically evaluated. Example:
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#
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# link_to_remote :url => {:action => 'delete'}
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#
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# The subsequently rendered <tt>delete.rjs</tt> might look like:
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#
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# page.replace_html 'sidebar', :partial => 'sidebar'
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# page.remove "person-#{@person.id}"
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# page.visual_effect :highlight, 'user-list'
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#
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# This refreshes the sidebar, removes a person element and highlights the user list.
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#
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# See the ActionView::Helpers::PrototypeHelper::GeneratorMethods documentation for more details.
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class Base
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module Subclasses
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end
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include Helpers, Rendering, Partials, Layouts, ::ERB::Util, Context
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extend ActiveSupport::Memoizable
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ActionView.run_base_hooks(self)
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# Specify whether RJS responses should be wrapped in a try/catch block
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# that alert()s the caught exception (and then re-raises it).
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cattr_accessor :debug_rjs
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@@debug_rjs = false
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class_attribute :helpers
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remove_method :helpers
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attr_reader :helpers
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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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end
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attr_accessor :base_path, :assigns, :template_extension, :lookup_context
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attr_internal :captures, :request, :controller, :template, :config
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delegate :find_template, :template_exists?, :formats, :formats=, :locale, :locale=,
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:view_paths, :view_paths=, :with_fallbacks, :update_details, :to => :lookup_context
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delegate :request_forgery_protection_token, :template, :params, :session, :cookies, :response, :headers,
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:flash, :action_name, :controller_name, :to => :controller
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delegate :logger, :to => :controller, :allow_nil => true
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# TODO: HACK FOR RJS
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def view_context
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self
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end
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def self.xss_safe? #:nodoc:
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true
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end
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def self.process_view_paths(value)
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ActionView::PathSet.new(Array.wrap(value))
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end
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def initialize(lookup_context = nil, assigns_for_first_render = {}, controller = nil, formats = nil) #:nodoc:
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@config = nil
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@assigns = assigns_for_first_render.each { |key, value| instance_variable_set("@#{key}", value) }
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@helpers = self.class.helpers || Module.new
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@_controller = controller
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@_config = ActiveSupport::InheritableOptions.new(controller.config) if controller && controller.respond_to?(:config)
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@_content_for = Hash.new { |h,k| h[k] = ActiveSupport::SafeBuffer.new }
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@_virtual_path = nil
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@lookup_context = lookup_context.is_a?(ActionView::LookupContext) ?
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lookup_context : ActionView::LookupContext.new(lookup_context)
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@lookup_context.formats = formats if formats
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end
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def controller_path
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@controller_path ||= controller && controller.controller_path
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end
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def punctuate_body!(part)
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flush_output_buffer
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response.body_parts << part
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nil
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end
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end
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end
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