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module ActionView
module Helpers
module AssetTagHelper
module StylesheetTagHelpers
extend ActiveSupport::Concern
included do
mattr_accessor :stylesheet_expansions
self.stylesheet_expansions = { }
end
module ClassMethods
# Register one or more stylesheet files to be included when <tt>symbol</tt>
# is passed to <tt>stylesheet_link_tag</tt>. This method is typically intended
# to be called from plugin initialization to register stylesheet files
# that the plugin installed in <tt>public/stylesheets</tt>.
#
# ActionView::Helpers::AssetTagHelper.register_stylesheet_expansion :monkey => ["head", "body", "tail"]
#
# stylesheet_link_tag :monkey # =>
# <link href="/stylesheets/head.css" media="screen" rel="stylesheet" type="text/css" />
# <link href="/stylesheets/body.css" media="screen" rel="stylesheet" type="text/css" />
# <link href="/stylesheets/tail.css" media="screen" rel="stylesheet" type="text/css" />
def register_stylesheet_expansion(expansions)
self.stylesheet_expansions.merge!(expansions)
end
end
# Computes the path to a stylesheet asset in the public stylesheets directory.
# If the +source+ filename has no extension, <tt>.css</tt> will be appended (except for explicit URIs).
# Full paths from the document root will be passed through.
# Used internally by +stylesheet_link_tag+ to build the stylesheet path.
#
# ==== Examples
# stylesheet_path "style" # => /stylesheets/style.css
# stylesheet_path "dir/style.css" # => /stylesheets/dir/style.css
# stylesheet_path "/dir/style.css" # => /dir/style.css
# stylesheet_path "http://www.railsapplication.com/css/style" # => http://www.railsapplication.com/css/style
# stylesheet_path "http://www.railsapplication.com/css/style.css" # => http://www.railsapplication.com/css/style.css
def stylesheet_path(source)
compute_public_path(source, 'stylesheets', 'css')
end
alias_method :path_to_stylesheet, :stylesheet_path # aliased to avoid conflicts with a stylesheet_path named route
# Returns a stylesheet link tag for the sources specified as arguments. If
# you don't specify an extension, <tt>.css</tt> will be appended automatically.
# You can modify the link attributes by passing a hash as the last argument.
#
# ==== Examples
# stylesheet_link_tag "style" # =>
# <link href="/stylesheets/style.css" media="screen" rel="stylesheet" type="text/css" />
#
# stylesheet_link_tag "style.css" # =>
# <link href="/stylesheets/style.css" media="screen" rel="stylesheet" type="text/css" />
#
# stylesheet_link_tag "http://www.railsapplication.com/style.css" # =>
# <link href="http://www.railsapplication.com/style.css" media="screen" rel="stylesheet" type="text/css" />
#
# stylesheet_link_tag "style", :media => "all" # =>
# <link href="/stylesheets/style.css" media="all" rel="stylesheet" type="text/css" />
#
# stylesheet_link_tag "style", :media => "print" # =>
# <link href="/stylesheets/style.css" media="print" rel="stylesheet" type="text/css" />
#
# stylesheet_link_tag "random.styles", "/css/stylish" # =>
# <link href="/stylesheets/random.styles" media="screen" rel="stylesheet" type="text/css" />
# <link href="/css/stylish.css" media="screen" rel="stylesheet" type="text/css" />
#
# You can also include all styles in the stylesheets directory using <tt>:all</tt> as the source:
#
# stylesheet_link_tag :all # =>
# <link href="/stylesheets/style1.css" media="screen" rel="stylesheet" type="text/css" />
# <link href="/stylesheets/styleB.css" media="screen" rel="stylesheet" type="text/css" />
# <link href="/stylesheets/styleX2.css" media="screen" rel="stylesheet" type="text/css" />
#
# If you want Rails to search in all the subdirectories under stylesheets, you should explicitly set <tt>:recursive</tt>:
#
# stylesheet_link_tag :all, :recursive => true
#
# == Caching multiple stylesheets into one
#
# You can also cache multiple stylesheets into one file, which requires less HTTP connections and can better be
# compressed by gzip (leading to faster transfers). Caching will only happen if config.perform_caching
# is set to true (which is the case by default for the Rails production environment, but not for the development
# environment). Examples:
#
# ==== Examples
# stylesheet_link_tag :all, :cache => true # when config.perform_caching is false =>
# <link href="/stylesheets/style1.css" media="screen" rel="stylesheet" type="text/css" />
# <link href="/stylesheets/styleB.css" media="screen" rel="stylesheet" type="text/css" />
# <link href="/stylesheets/styleX2.css" media="screen" rel="stylesheet" type="text/css" />
#
# stylesheet_link_tag :all, :cache => true # when config.perform_caching is true =>
# <link href="/stylesheets/all.css" media="screen" rel="stylesheet" type="text/css" />
#
# stylesheet_link_tag "shop", "cart", "checkout", :cache => "payment" # when config.perform_caching is false =>
# <link href="/stylesheets/shop.css" media="screen" rel="stylesheet" type="text/css" />
# <link href="/stylesheets/cart.css" media="screen" rel="stylesheet" type="text/css" />
# <link href="/stylesheets/checkout.css" media="screen" rel="stylesheet" type="text/css" />
#
# stylesheet_link_tag "shop", "cart", "checkout", :cache => "payment" # when config.perform_caching is true =>
# <link href="/stylesheets/payment.css" media="screen" rel="stylesheet" type="text/css" />
#
# The <tt>:recursive</tt> option is also available for caching:
#
# stylesheet_link_tag :all, :cache => true, :recursive => true
#
# To force concatenation (even in development mode) set <tt>:concat</tt> to true. This is useful if
# you have too many stylesheets for IE to load.
#
# stylesheet_link_tag :all, :concat => true
#
def stylesheet_link_tag(*sources)
options = sources.extract_options!.stringify_keys
concat = options.delete("concat")
cache = concat || options.delete("cache")
recursive = options.delete("recursive")
if concat || (config.perform_caching && cache)
joined_stylesheet_name = (cache == true ? "all" : cache) + ".css"
joined_stylesheet_path = File.join(joined_stylesheet_name[/^#{File::SEPARATOR}/] ? config.assets_dir : config.stylesheets_dir, joined_stylesheet_name)
unless config.perform_caching && File.exists?(joined_stylesheet_path)
write_asset_file_contents(joined_stylesheet_path, compute_stylesheet_paths(sources, recursive))
end
stylesheet_tag(joined_stylesheet_name, options)
else
sources = expand_stylesheet_sources(sources, recursive)
ensure_stylesheet_sources!(sources) if cache
sources.collect { |source| stylesheet_tag(source, options) }.join("\n").html_safe
end
end
private
def stylesheet_tag(source, options)
tag("link", { "rel" => "stylesheet", "type" => Mime::CSS, "media" => "screen", "href" => ERB::Util.html_escape(path_to_stylesheet(source)) }.merge(options), false, false)
end
def compute_stylesheet_paths(*args)
expand_stylesheet_sources(*args).collect { |source| compute_public_path(source, 'stylesheets', 'css', false) }
end
def expand_stylesheet_sources(sources, recursive)
if sources.first == :all
collect_asset_files(config.stylesheets_dir, ('**' if recursive), '*.css')
else
sources.collect do |source|
determine_source(source, self.stylesheet_expansions)
end.flatten
end
end
def ensure_stylesheet_sources!(sources)
sources.each do |source|
asset_file_path!(path_to_stylesheet(source))
end
return sources
end
end
end
end
end
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