2004-11-23 20:04:44 -05:00
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require 'erb'
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module ActionView #:nodoc:
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class ActionViewError < StandardError #:nodoc:
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end
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# Action View templates can be written in two ways. If the template file has a +.rhtml+ extension then it uses a mixture of ERb
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# (included in Ruby) and HTML. If the template file has a +.rxml+ 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 difference is whether you want output or not. 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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# == 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 in 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 @page_title 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 shared/header 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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# == Template caching
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#
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# The parsing of ERb templates are cached by default, but the reading of them are not. This means that the application by default
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# will reflect changes to the templates immediatly. If you'd like to sacrifice that immediacy for the speed gain given by also
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2005-02-07 09:15:53 -05:00
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# caching the loading of templates (reading from the file system), you can turn that on with
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2004-11-23 20:04:44 -05:00
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# <tt>ActionView::Base.cache_template_loading = true</tt>.
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#
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# == Builder
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#
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2005-02-07 09:15:53 -05:00
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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 +.rxml+ 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("emp & 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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# xm.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 ERB::Util
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attr_reader :first_render
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attr_accessor :base_path, :assigns, :template_extension
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attr_accessor :controller
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# Turn on to cache the reading of templates from the file system. Doing so means that you have to restart the server
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# when changing templates, but that rendering will be faster.
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@@cache_template_loading = false
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cattr_accessor :cache_template_loading
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@@compiled_erb_templates = {}
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@@loaded_templates = {}
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@@template_handlers = {}
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def self.load_helpers(helper_dir)#:nodoc:
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Dir.foreach(helper_dir) do |helper_file|
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next unless helper_file =~ /_helper.rb$/
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require helper_dir + helper_file
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helper_module_name = helper_file.capitalize.gsub(/_([a-z])/) { |m| $1.capitalize }[0..-4]
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class_eval("include ActionView::Helpers::#{helper_module_name}") if Helpers.const_defined?(helper_module_name)
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end
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end
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def self.controller_delegate(*methods)#:nodoc:
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methods.flatten.each do |method|
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class_eval <<-end_eval
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def #{method}(*args, &block)
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controller.send(%(#{method}), *args, &block)
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end
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end_eval
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end
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end
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def self.register_template_handler(extension, klass)
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@@template_handlers[extension] = klass
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end
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def initialize(base_path = nil, assigns_for_first_render = {}, controller = nil)#:nodoc:
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@base_path, @assigns = base_path, assigns_for_first_render
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@controller = controller
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end
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# 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 template_root, 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 = {})
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@first_render = template_path if @first_render.nil?
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if use_full_path
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template_extension = pick_template_extension(template_path)
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template_file_name = full_template_path(template_path, template_extension)
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else
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template_file_name = template_path
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template_extension = template_path.split(".").last
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end
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template_source = read_template_file(template_file_name)
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begin
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render_template(template_extension, template_source, local_assigns)
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rescue Exception => e
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if TemplateError === e
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e.sub_template_of(template_file_name)
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raise e
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else
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raise TemplateError.new(@base_path, template_file_name, @assigns, template_source, e)
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end
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end
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end
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# Renders the template present at <tt>template_path</tt> (relative to the template_root).
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# The hash in <tt>local_assigns</tt> is made available as local variables.
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def render(template_path, local_assigns = {})
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render_file(template_path, true, local_assigns)
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end
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# Renders the +template+ which is given as a string as either rhtml or rxml depending on <tt>template_extension</tt>.
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# The hash in <tt>local_assigns</tt> is made available as local variables.
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def render_template(template_extension, template, local_assigns = {})
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send(pick_rendering_method(template_extension), template_extension,
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template, local_assigns)
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end
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def pick_template_extension(template_path)#:nodoc:
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if match = delegate_template_exists?(template_path)
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match.first
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elsif erb_template_exists?(template_path)
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"rhtml"
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elsif builder_template_exists?(template_path)
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"rxml"
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else
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raise ActionViewError, "No rhtml, rxml, or delegate template found for #{template_path}"
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end
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end
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def pick_rendering_method(template_extension)#:nodoc:
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if @@template_handlers[template_extension]
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"delegate_render"
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else
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(template_extension == "rxml" ? "rxml" : "rhtml") + "_render"
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end
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end
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def delegate_template_exists?(template_path)#:nodoc:
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@@template_handlers.find { |k,| template_exists?(template_path, k) }
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end
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def erb_template_exists?(template_path)#:nodoc:
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template_exists?(template_path, "rhtml")
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end
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def builder_template_exists?(template_path)#:nodoc:
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template_exists?(template_path, "rxml")
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end
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def file_exists?(template_path)#:nodoc:
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erb_template_exists?(template_path) || builder_template_exists?(template_path) || delegate_template_exists?(template_path)
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end
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# Returns true is the file may be rendered implicitly.
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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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private
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def full_template_path(template_path, extension)
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"#{@base_path}/#{template_path}.#{extension}"
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end
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def template_exists?(template_path, extension)
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(cache_template_loading && @@loaded_templates.has_key?(template_path)) ||
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FileTest.exists?(full_template_path(template_path, extension))
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end
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def read_template_file(template_path)
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unless cache_template_loading && @@loaded_templates[template_path]
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@@loaded_templates[template_path] = File.read(template_path)
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end
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@@loaded_templates[template_path]
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end
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def evaluate_locals(local_assigns = {})
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b = binding
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local_assigns.stringify_keys!
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local_assigns.each { |key, value| eval "#{key} = local_assigns[\"#{key}\"]", b }
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@assigns.each { |key, value| instance_variable_set "@#{key}", value }
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xml = Builder::XmlMarkup.new(:indent => 2)
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b
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end
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def rhtml_render(extension, template, local_assigns)
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b = evaluate_locals(local_assigns)
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@@compiled_erb_templates[template] ||= ERB.new(template, nil, '-')
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@@compiled_erb_templates[template].result(b)
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end
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def rxml_render(extension, template, local_assigns)
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@controller.headers["Content-Type"] ||= 'text/xml'
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eval(template, evaluate_locals(local_assigns))
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end
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def delegate_render(extension, template, local_assigns)
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delegator = @@template_handlers[extension].new(self)
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delegator.render(template, local_assigns)
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end
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end
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end
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2005-02-19 12:22:37 -05:00
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require 'action_view/template_error'
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