/usr/lib/ruby/vendor_ruby/merb-core/controller/mixins/render.rb is in ruby-merb-core 1.1.3+dfsg-2.
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# So we can do raise TemplateNotFound
include Merb::ControllerExceptions
# ==== Parameters
# base<Module>:: Module that is including RenderMixin (probably a controller)
#
# @private
def self.included(base)
base.extend(ClassMethods)
base.class_eval do
class_inheritable_accessor :_default_render_options
end
end
module ClassMethods
def _templates_for
@_templates_for ||= {}
end
# Return the default render options.
#
# ==== Returns
# Hash:: An options hash
#
# :api: public
def default_render_options
self._default_render_options ||= {}
end
# Set default render options at the class level.
#
# ==== Parameters
# opts<Hash>:: An options hash
#
# :api: public
def render_options(opts)
self._default_render_options = opts
end
# Set the default layout to use or nil/false to disable layout rendering.
# This is a shortcut for render_options :layout => false.
#
# ==== Parameters
# layout<~to_s>:: The layout that should be used for this class.
#
# ==== Notes
# You can override by passing :layout => true to render method.
#
# ==== Returns
# Hash:: The default render options.
#
# :api: public
def layout(layout)
self.default_render_options.update(:layout => (layout || false))
end
# Enable the default layout logic - reset the layout option.
#
# ==== Returns
# ~to_s:: The layout that was previously set.
#
# :api: public
def default_layout
self.default_render_options.delete(:layout)
end
end
# Render the specified item, with the specified options.
#
# ==== Parameters
# thing<String, Symbol, nil>::
# The thing to render. This will default to the current action
# opts<Hash>:: An options hash (see below)
#
# ==== Options (opts)
# :format<Symbol>:: A registered mime-type format
# :template<String>::
# The path to the template relative to the template root
# :status<~to_i>::
# The status to send to the client. Typically, this would be an integer
# (200), or a Merb status code (Accepted)
# :layout<~to_s, FalseClass>::
# A layout to use instead of the default. This should be relative to the
# layout root. By default, the layout will be either the controller_name or
# application. If you want to use an alternative content-type than the one
# that the base template was rendered as, you will need to do :layout =>
# "foo.#{content_type}" (i.e. "foo.json"). If you want to render without
# layout, use :layout => false. This overrides layout set by +layout+ method.
#
# ==== Returns
# String:: The rendered template, including layout, if appropriate.
#
# ==== Raises
# TemplateNotFound:: There is no template for the specified location.
#
# ==== Alternatives
# If you pass a Hash as the first parameter, it will be moved to opts and
# "thing" will be the current action
#
# :api: public
def render(thing = nil, opts = {})
# render :format => :xml means render nil, :format => :xml
opts, thing = thing, nil if thing.is_a?(Hash)
# Merge with class level default render options
opts = self.class.default_render_options.merge(opts)
# If you don't specify a thing to render, assume they want to render the current action
thing ||= action_name.to_sym
# Content negotiation
self.content_type = opts[:format] if opts[:format]
# Handle options (:status)
_handle_options!(opts)
# Do we have a template to try to render?
if thing.is_a?(Symbol) || opts[:template]
template_method, template_location =
_template_for(thing, content_type, controller_name, opts[:template])
# Raise an error if there's no template
unless template_method && self.respond_to?(template_method)
template_files = Merb::Template.template_extensions.map { |ext| "#{template_location}.#{ext}" }
raise TemplateNotFound, "Oops! No template found. Merb was looking for #{template_files.join(', ')} " +
"for content type '#{content_type}'. You might have mispelled the template or file name. " +
"Registered template extensions: #{Merb::Template.template_extensions.join(', ')}. " +
"If you use Haml or some other template plugin, make sure you required Merb plugin dependency " +
"in your init file."
end
# Call the method in question and throw the content for later consumption by the layout
throw_content(:for_layout, self.send(template_method))
# Do we have a string to render?
elsif thing.is_a?(String)
# Throw it for later consumption by the layout
throw_content(:for_layout, thing)
end
# If we find a layout, use it. Otherwise, just render the content thrown for layout.
(layout = _get_layout(opts[:layout])) ? send(layout) : catch_content(:for_layout)
end
# Renders an object using to registered transform method based on the
# negotiated content-type, if a template does not exist. For instance, if the
# content-type is :json, Merb will first look for current_action.json.*.
# Failing that, it will run object.to_json.
#
# ==== Parameter
# object<Object>::
# An object that responds_to? the transform method registered for the
# negotiated mime-type.
# thing<String, Symbol>::
# The thing to attempt to render via #render before calling the transform
# method on the object. Defaults to nil.
# opts<Hash>::
# An options hash that will be used for rendering
# (passed on to #render or serialization methods like #to_json or #to_xml)
#
# ==== Returns
# String::
# The rendered template or if no template is found, the transformed object.
#
# ==== Raises
# NotAcceptable::
# If there is no transform method for the specified mime-type or the object
# does not respond to the transform method.
#
# ==== Alternatives
# A string in the second parameter will be interpreted as a template:
# display @object, "path/to/foo"
# #=> display @object, nil, :template => "path/to/foo"
#
# A hash in the second parameters will be interpreted as opts:
# display @object, :layout => "zoo"
# #=> display @object, nil, :layout => "zoo"
#
# If you need to pass extra parameters to serialization method, for instance,
# to exclude some of attributes or serialize associations, just pass options
# for it.
# For instance,
#
# display @locations, :except => [:locatable_type, :locatable_id], :include => [:locatable]
#
# serializes object with polymorphic association, not raw locatable_* attributes.
#
#
# ==== Options
#
# :template a template to use for rendering
# :layout a layout to use for rendering
# :status the status code to return (defaults to 200)
# :location the value of the Location header
#
# all other options options that will be pass to serialization method
# like #to_json or #to_xml
#
# ==== Notes
# The transformed object will not be used in a layout unless a :layout is
# explicitly passed in the opts.
#
# :api: public
def display(object, thing = nil, opts = {})
template_opt = thing.is_a?(Hash) ? thing.delete(:template) : opts.delete(:template)
case thing
# display @object, "path/to/foo" means display @object, nil, :template => "path/to/foo"
when String
template_opt, thing = thing, nil
# display @object, :template => "path/to/foo" means display @object, nil, :template => "path/to/foo"
when Hash
opts, thing = thing, nil
end
# Try to render without the object
render(thing || action_name.to_sym, opts.merge(:template => template_opt))
# If the render fails (i.e. a template was not found)
rescue TemplateNotFound => e
# Merge with class level default render options
# @todo can we find a way to refactor this out so we don't have to do it everywhere?
opts = self.class.default_render_options.merge(opts)
# Figure out what to transform and raise NotAcceptable unless there's a transform method assigned
transform = Merb.mime_transform_method(content_type)
if !transform
raise NotAcceptable, "#{e.message} and there was no transform method registered for #{content_type.inspect}"
elsif !object.respond_to?(transform)
raise NotAcceptable, "#{e.message} and your object does not respond to ##{transform}"
end
layout_opt = opts.delete(:layout)
_handle_options!(opts)
throw_content(:for_layout, opts.empty? ? object.send(transform) : object.send(transform, opts))
meth, _ = _template_for(layout_opt, layout_opt.to_s.index(".") ? nil : content_type, "layout") if layout_opt
meth ? send(meth) : catch_content(:for_layout)
end
# Render a partial template.
#
# ==== Parameters
# template<~to_s>::
# The path to the template, relative to the current controller or the
# template root; absolute path will work too. If the template contains a "/",
# Merb will search for it relative to the template root; otherwise,
# Merb will search for it relative to the current controller.
# opts<Hash>:: A hash of options (see below)
#
# ==== Options (opts)
# :with<Object, Array>::
# An object or an array of objects that will be passed into the partial.
# :as<~to_sym>:: The local name of the :with Object inside of the partial.
# :format<Symbol>:: The mime format that you want the partial to be in (:js, :html, etc.)
# others::
# A Hash object names and values that will be the local names and values
# inside the partial.
#
# ==== Examples
# partial :foo, :hello => @object
#
# The "_foo" partial will be called, relative to the current controller,
# with a local variable of +hello+ inside of it, assigned to @object.
#
# partial :bar, :with => ['one', 'two', 'three']
#
# The "_bar" partial will be called once for each element of the array
# specified by :with for a total of three iterations. Each element
# of the array will be available in the partial via a local variable named
# +bar+. Additionally, there will be two extra local variables:
# +collection_index+ and +collection_size+. +collection_index+ is the index
# of the object currently referenced by +bar+ in the collection passed to
# the partial. +collection_size+ is the total size of the collection.
#
# By default, the object specified by :with will be available through a
# local variable with the same name as the partial template. However,
# this can be changed using the :as option.
#
# partial :bar, :with => "one", :as => :number
#
# In this case, "one" will be available in the partial through the local
# variable named +number+.
#
# :api: public
def partial(template, opts={})
# partial :foo becomes "#{controller_name}/_foo"
# partial "foo/bar" becomes "foo/_bar"
template = template.to_s
if template =~ %r{^/}
template_path = File.dirname(template) / "_#{File.basename(template)}"
else
kontroller = (m = template.match(/.*(?=\/)/)) ? m[0] : controller_name
end
template = "_#{File.basename(template)}"
# This handles no :with as well
with = [opts.delete(:with)].flatten
as = (opts.delete(:as) || template.match(%r[(?:.*/)?_([^\./]*)])[1]).to_sym
# Ensure that as is in the locals hash even if it isn't passed in here
# so that it's included in the preamble.
locals = opts.merge(:collection_index => -1, :collection_size => with.size, as => opts[as])
template_method, template_location = _template_for(
template,
opts.delete(:format) || content_type,
kontroller,
template_path,
locals.keys)
# this handles an edge-case where the name of the partial is _foo.* and your opts
# have :foo as a key.
named_local = opts.key?(as)
sent_template = with.map do |temp|
locals[as] = temp unless named_local
if template_method && self.respond_to?(template_method)
locals[:collection_index] += 1
send(template_method, locals)
else
raise TemplateNotFound, "Could not find template at #{template_location}.*"
end
end.join
sent_template
end
# Take the options hash and handle it as appropriate.
#
# ==== Parameters
# opts<Hash>:: The options hash that was passed into render.
#
# ==== Options
# :status<~to_i>::
# The status of the response will be set to opts[:status].to_i
#
# ==== Returns
# Hash:: The options hash that was passed in.
#
# :api: private
def _handle_options!(opts)
self.status = opts.delete(:status).to_i if opts[:status]
headers["Location"] = opts.delete(:location) if opts[:location]
opts
end
# Get the layout that should be used. The content-type will be appended to
# the layout unless the layout already contains a "." in it.
#
# If no layout was passed in, this method will look for one with the same
# name as the controller, and finally one in "application.#{content_type}".
#
# ==== Parameters
# layout<~to_s>:: A layout, relative to the layout root. Defaults to nil.
#
# ==== Returns
# String:: The method name that corresponds to the found layout.
#
# ==== Raises
# TemplateNotFound::
# If a layout was specified (either via layout in the class or by passing
# one in to this method), and not found. No error will be raised if no
# layout was specified, and the default layouts were not found.
#
# :api: private
def _get_layout(layout = nil)
return false if layout == false
layout = layout.instance_of?(Symbol) && self.respond_to?(layout, true) ? send(layout) : layout
layout = layout.to_s if layout
# If a layout was provided, throw an error if it's not found
if layout
template_method, template_location =
_template_for(layout, layout.index(".") ? nil : content_type, "layout")
raise TemplateNotFound, "No layout found at #{template_location}" unless template_method
template_method
# If a layout was not provided, try the default locations
else
template, location = _template_for(controller_name, content_type, "layout")
template, location = _template_for("application", content_type, "layout") unless template
template
end
end
# Iterate over the template roots in reverse order, and return the template
# and template location of the first match.
#
# ==== Parameters
# context<Object>:: The controller action or template (basename or absolute path).
# content_type<~to_s>:: The content type (like html or json).
# controller<~to_s>:: The name of the controller. Defaults to nil.
# locals<Array[Symbol]>:: A list of locals to assign from the args passed into the compiled template.
#
# ==== Options (opts)
# :template<String>::
# The location of the template to use. Defaults to whatever matches this
# context, content_type and controller.
#
# ==== Returns
# Array[Symbol, String]::
# A pair consisting of the template method and location.
#
# :api: private
def _template_for(context, content_type, controller=nil, template=nil, locals=[])
tmp = self.class._templates_for[[context, content_type, controller, template, locals]]
return tmp if tmp
template_method, template_location = nil, nil
# absolute path to a template (:template => "/foo/bar")
if template.is_a?(String) && template =~ %r{^/}
template_location = self._absolute_template_location(template, content_type)
return [_template_method_for(template_location, locals), template_location]
end
self.class._template_roots.reverse_each do |root, template_meth|
# :template => "foo/bar.html" where root / "foo/bar.html.*" exists
if template
template_location = root / self.send(template_meth, template, content_type, nil)
# :layout => "foo" where root / "layouts" / "#{controller}.html.*" exists
else
template_location = root / self.send(template_meth, context, content_type, controller)
end
break if template_method = _template_method_for(template_location.to_s, locals)
end
# template_location is a Pathname
ret = [template_method, template_location.to_s]
unless Merb::Config[:reload_templates]
self.class._templates_for[[context, content_type, controller, template, locals]] = ret
end
ret
end
# Return the template method for a location, and check to make sure the current controller
# actually responds to the method.
#
# ==== Parameters
# template_location<String>:: The phyical path of the template
# locals<Array[Symbol]>:: A list of locals to assign from the args passed into the compiled template.
#
# ==== Returns
# String:: The method, if it exists. Otherwise return nil.
#
# :api: private
def _template_method_for(template_location, locals)
meth = Merb::Template.template_for(template_location, [], locals)
meth && self.respond_to?(meth) ? meth : nil
end
# Called in templates to get at content thrown in another template. The
# results of rendering a template are automatically thrown into :for_layout,
# so catch_content or catch_content(:for_layout) can be used inside layouts
# to get the content rendered by the action template.
#
# ==== Parameters
# obj<Object>:: The key in the thrown_content hash. Defaults to :for_layout.
#
# :api: public
def catch_content(obj = :for_layout)
@_caught_content[obj] || ''
end
# Called in templates to test for the existence of previously thrown content.
#
# ==== Parameters
# obj<Object>:: The key in the thrown_content hash. Defaults to :for_layout.
#
# :api: public
def thrown_content?(obj = :for_layout)
@_caught_content.key?(obj)
end
# Called in templates to store up content for later use. Takes a string
# and/or a block. First, the string is evaluated, and then the block is
# captured using the capture() helper provided by the template languages. The
# two are concatenated together.
#
# ==== Parameters
# obj<Object>:: The key in the thrown_content hash.
# string<String>:: Textual content. Defaults to nil.
# &block:: A block to be evaluated and concatenated to string.
#
# ==== Raises
# ArgumentError:: Neither string nor block given.
#
# ==== Example
# throw_content(:foo, "Foo")
# catch_content(:foo) #=> "Foo"
#
# :api: public
def throw_content(obj, string = nil, &block)
unless string || block_given?
raise ArgumentError, "You must pass a block or a string into throw_content"
end
@_caught_content[obj] = string.to_s << (block_given? ? capture(&block) : "")
end
# Called in templates to append content for later use. Works like throw_content.
#
# @param [Object] obj
# Key used in the thrown_content hash.
# @param [String] string
# Textual content. Default to nil.
# @yield
# Evaluated with result concatenated to string.
#
# @raise [ArgumentError]
# Neither string nor block given
#
# :api: public
def append_content(obj, string = nil, &block)
unless string || block_given?
raise ArgumentError, "You must pass a block or a string into append_content"
end
@_caught_content[obj] = "" if @_caught_content[obj].nil?
@_caught_content[obj] << string.to_s << (block_given? ? capture(&block) : "")
end
# Called when renderers need to be sure that existing thrown content is cleared
# before throwing new content. This prevents double rendering of content when
# multiple templates are rendered after each other.
#
# ==== Parameters
# obj<Object>:: The key in the thrown_content hash. Defaults to :for_layout.
#
# :api: public
def clear_content(obj = :for_layout)
@_caught_content.delete(obj) unless @_caught_content[obj].nil?
end
end
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