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module ActionView
class PartialRenderer < AbstractRenderer #:nodoc:
PARTIAL_NAMES = Hash.new {|h,k| h[k] = {} }
def initialize(view)
super
@partial_names = PARTIAL_NAMES[@view.controller.class.name]
end
def setup(options, block)
partial = options[:partial]
@options = options
@locals = options[:locals] || {}
@block = block
if String === partial
@object = options[:object]
@path = partial
@collection = collection
else
@object = partial
if @collection = collection_from_object || collection
paths = @collection_data = @collection.map { |o| partial_path(o) }
@path = paths.uniq.size == 1 ? paths.first : nil
else
@path = partial_path
end
end
if @path
@variable, @variable_counter = retrieve_variable(@path)
else
paths.map! { |path| retrieve_variable(path).unshift(path) }
end
self
end
def render
wrap_formats(@path) do
identifier = ((@template = find_partial) ? @template.identifier : @path)
if @collection
instrument(:collection, :identifier => identifier || "collection", :count => @collection.size) do
render_collection
end
else
instrument(:partial, :identifier => identifier) do
render_partial
end
end
end
end
def render_collection
return nil if @collection.blank?
if @options.key?(:spacer_template)
spacer = find_template(@options[:spacer_template]).render(@view, @locals)
end
result = @template ? collection_with_template : collection_without_template
result.join(spacer).html_safe
end
def render_partial
locals, view, block = @locals, @view, @block
object, as = @object, @variable
if !block && (layout = @options[:layout])
layout = find_template(layout)
end
object ||= locals[as]
locals[as] = object
content = @template.render(view, locals) do |*name|
view._block_layout_for(*name, &block)
end
content = layout.render(view, locals){ content } if layout
content
end
private
def collection
if @options.key?(:collection)
collection = @options[:collection]
collection.respond_to?(:to_ary) ? collection.to_ary : []
end
end
def collection_from_object
if @object.respond_to?(:to_ary)
@object.to_ary
end
end
def find_partial
if path = @path
locals = @locals.keys
locals << @variable
locals << @variable_counter if @collection
find_template(path, locals)
end
end
def find_template(path=@path, locals=@locals.keys)
prefixes = path.include?(?/) ? [] : @view.controller_prefixes
@lookup_context.find_template(path, prefixes, true, locals)
end
def collection_with_template
segments, locals, template = [], @locals, @template
as, counter = @variable, @variable_counter
locals[counter] = -1
@collection.each do |object|
locals[counter] += 1
locals[as] = object
segments << template.render(@view, locals)
end
segments
end
def collection_without_template
segments, locals, collection_data = [], @locals, @collection_data
index, template, cache = -1, nil, {}
keys = @locals.keys
@collection.each_with_index do |object, i|
path, *data = collection_data[i]
template = (cache[path] ||= find_template(path, keys + data))
locals[data[0]] = object
locals[data[1]] = (index += 1)
segments << template.render(@view, locals)
end
@template = template
segments
end
def partial_path(object = @object)
@partial_names[object.class.name] ||= begin
object = object.to_model if object.respond_to?(:to_model)
object.class.model_name.partial_path.dup.tap do |partial|
path = @view.controller_prefixes.first
partial.insert(0, "#{File.dirname(path)}/") if partial.include?(?/) && path.include?(?/)
end
end
end
def retrieve_variable(path)
variable = @options[:as].try(:to_sym) || path[%r'_?(\w+)(\.\w+)*$', 1].to_sym
variable_counter = :"#{variable}_counter" if @collection
[variable, variable_counter]
end
end
end
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