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module ActionView #:nodoc:
class ActionViewError < StandardError #:nodoc:
end
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# Action View templates can be written in three ways. If the template file has a +.erb+ (or +.rhtml+) extension then it uses a mixture of ERb
# (included in Ruby) and HTML. If the template file has a +.builder+ (or +.rxml+) extension then Jim Weirich's Builder::XmlMarkup library is used.
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# If the template file has a +.rjs+ extension then it will use ActionView::Helpers::PrototypeHelper::JavaScriptGenerator.
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#
# = ERb
#
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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:
#
# <b>Names of all the people</b>
# <% for person in @people %>
# Name: <%= person.name %><br/>
# <% end %>
#
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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:
#
# Hi, Mr. <% puts "Frodo" %>
#
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# If you absolutely must write from within a function, you can use the TextHelper#concat
#
# <%- and -%> suppress leading and trailing whitespace, including the trailing newline, and can be used interchangeably with <% and %>.
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#
# == 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
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# variables defined using the regular embedding tags. Like this:
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#
# <% @page_title = "A Wonderful Hello" %>
# <%= render "shared/header" %>
#
# Now the header can pick up on the @page_title 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:
#
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# <%= render "shared/header", { :headline => "Welcome", :person => person } %>
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#
# These can now be accessed in shared/header with:
#
# Headline: <%= headline %>
# First name: <%= person.first_name %>
#
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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,
# 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.
#
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# == Template caching
#
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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
# check the file's modification time and recompile it.
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#
# == Builder
#
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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 +.builder+ extension.
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#
# Here are some basic examples:
#
# 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.
#
# 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 {
# xml.h1(@person.name)
# xml.p(@person.bio)
# }
#
# 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"
#
# for item in @recent_items
# 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.
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#
# == JavaScriptGenerator
#
# JavaScriptGenerator templates end in +.rjs+. Unlike conventional templates which are used to
# render the results of an action, these templates generate instructions on how to modify an already rendered page. This makes it easy to
# modify multiple elements on your page in one declarative Ajax response. Actions with these templates are called in the background with Ajax
# and make updates to the page where the request originated from.
#
# 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.
#
# When an .rjs action is called with +link_to_remote+, the generated JavaScript is automatically evaluated. Example:
#
# link_to_remote :url => {:action => 'delete'}
#
# The subsequently rendered +delete.rjs+ might look like:
#
# page.replace_html 'sidebar', :partial => 'sidebar'
# page.remove "person-#{@person.id}"
# page.visual_effect :highlight, 'user-list'
#
# This refreshes the sidebar, removes a person element and highlights the user list.
#
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# See the ActionView::Helpers::PrototypeHelper::GeneratorMethods documentation for more details.
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class Base
include ERB :: Util
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attr_reader :finder
attr_accessor :base_path , :assigns , :template_extension , :first_render
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attr_accessor :controller
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attr_reader :logger , :response , :headers
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attr_internal :cookies , :flash , :headers , :params , :request , :response , :session
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attr_writer :template_format
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attr_accessor :current_render_extension
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# Specify trim mode for the ERB compiler. Defaults to '-'.
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# See ERb documentation for suitable values.
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@@erb_trim_mode = '-'
cattr_accessor :erb_trim_mode
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# Specify whether file modification times should be checked to see if a template needs recompilation
@@cache_template_loading = false
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cattr_accessor :cache_template_loading
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# Specify whether file extension lookup should be cached, and whether template base path lookup should be cached.
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# Should be +false+ for development environments. Defaults to +true+.
@@cache_template_extensions = true
cattr_accessor :cache_template_extensions
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# Specify whether RJS responses should be wrapped in a try/catch block
# that alert()s the caught exception (and then re-raises it).
@@debug_rjs = false
cattr_accessor :debug_rjs
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@@erb_variable = '_erbout'
cattr_accessor :erb_variable
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delegate :request_forgery_protection_token , :to = > :controller
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module CompiledTemplates #:nodoc:
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# holds compiled template code
end
include CompiledTemplates
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# Maps inline templates to their method names
cattr_accessor :method_names
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@@method_names = { }
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# Map method names to the names passed in local assigns so far
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@@template_args = { }
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# Cache public asset paths
cattr_reader :computed_public_paths
@@computed_public_paths = { }
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class ObjectWrapper < Struct . new ( :value ) #:nodoc:
end
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def self . load_helpers #:nodoc:
Dir . entries ( " #{ File . dirname ( __FILE__ ) } /helpers " ) . sort . each do | file |
next unless file =~ / ^([a-z][a-z_]*_helper).rb$ /
require " action_view/helpers/ #{ $1 } "
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helper_module_name = $1 . camelize
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if Helpers . const_defined? ( helper_module_name )
include Helpers . const_get ( helper_module_name )
end
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end
end
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def initialize ( view_paths = [ ] , assigns_for_first_render = { } , controller = nil ) #:nodoc:
@assigns = assigns_for_first_render
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@assigns_added = nil
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@controller = controller
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@logger = controller && controller . logger
@finder = TemplateFinder . new ( self , view_paths )
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end
# Renders the template present at <tt>template_path</tt>. If <tt>use_full_path</tt> is set to true,
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# it's relative to the view_paths array, otherwise it's absolute. The hash in <tt>local_assigns</tt>
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# is made available as local variables.
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def render_file ( template_path , use_full_path = true , local_assigns = { } ) #:nodoc:
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if defined? ( ActionMailer ) && defined? ( ActionMailer :: Base ) && controller . is_a? ( ActionMailer :: Base ) && ! template_path . include? ( " / " )
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raise ActionViewError , <<-END_ERROR
Due to changes in ActionMailer , you need to provide the mailer_name along with the template name .
render " user_mailer/signup "
render :file = > " user_mailer/signup "
If you are rendering a subtemplate , you must now use controller - like partial syntax :
render :partial = > 'signup' # no mailer_name necessary
END_ERROR
end
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template = Template . new ( self , template_path , use_full_path , local_assigns )
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begin
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render_template ( template )
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rescue Exception = > e
if TemplateError === e
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e . sub_template_of ( template . filename )
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raise e
else
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raise TemplateError . new ( template , @assigns , e )
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end
end
end
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# Renders the template present at <tt>template_path</tt> (relative to the view_paths array).
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# The hash in <tt>local_assigns</tt> is made available as local variables.
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def render ( options = { } , local_assigns = { } , & block ) #:nodoc:
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if options . is_a? ( String )
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render_file ( options , true , local_assigns )
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elsif options == :update
update_page ( & block )
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elsif options . is_a? ( Hash )
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options = options . reverse_merge ( :locals = > { } , :use_full_path = > true )
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if partial_layout = options . delete ( :layout )
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if block_given?
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wrap_content_for_layout capture ( & block ) do
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concat ( render ( options . merge ( :partial = > partial_layout ) ) , block . binding )
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end
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else
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wrap_content_for_layout render ( options ) do
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render ( options . merge ( :partial = > partial_layout ) )
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end
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end
elsif options [ :file ]
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render_file ( options [ :file ] , options [ :use_full_path ] , options [ :locals ] )
elsif options [ :partial ] && options [ :collection ]
render_partial_collection ( options [ :partial ] , options [ :collection ] , options [ :spacer_template ] , options [ :locals ] )
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elsif options [ :partial ]
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render_partial ( options [ :partial ] , ActionView :: Base :: ObjectWrapper . new ( options [ :object ] ) , options [ :locals ] )
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elsif options [ :inline ]
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template = Template . new ( self , options [ :inline ] , false , options [ :locals ] , true , options [ :type ] )
render_template ( template )
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end
end
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end
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def render_template ( template ) #:nodoc:
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template . render
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end
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# Returns true is the file may be rendered implicitly.
def file_public? ( template_path ) #:nodoc:
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template_path . split ( '/' ) . last [ 0 , 1 ] != '_'
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end
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# symbolized version of the :format parameter of the request, or :html by default.
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#
# EXCEPTION: If the :format parameter is not set, the Accept header will be examined for
# whether it contains the JavaScript mime type as its first priority. If that's the case,
# it will be used. This ensures that Ajax applications can use the same URL to support both
# JavaScript and non-JavaScript users.
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def template_format
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return @template_format if @template_format
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if controller && controller . respond_to? ( :request )
parameter_format = controller . request . parameters [ :format ]
accept_format = controller . request . accepts . first
case
when parameter_format . blank? && accept_format != :js
@template_format = :html
when parameter_format . blank? && accept_format == :js
@template_format = :js
else
@template_format = parameter_format . to_sym
end
else
@template_format = :html
end
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end
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private
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def wrap_content_for_layout ( content )
original_content_for_layout = @content_for_layout
@content_for_layout = content
returning ( yield ) { @content_for_layout = original_content_for_layout }
end
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# Evaluate the local assigns and pushes them to the view.
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def evaluate_assigns
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unless @assigns_added
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assign_variables_from_controller
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@assigns_added = true
end
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end
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# Assigns instance variables from the controller to the view.
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def assign_variables_from_controller
@assigns . each { | key , value | instance_variable_set ( " @ #{ key } " , value ) }
end
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def execute ( template )
send ( template . method , template . locals ) do | * names |
instance_variable_get " @content_for_ #{ names . first || 'layout' } "
end
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end
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end
end