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require 'cgi'
require File.dirname(__FILE__) + '/url_helper'
require File.dirname(__FILE__) + '/tag_helper'
module ActionView
module Helpers
# Provides methods for linking a HTML page together with other assets, such as javascripts, stylesheets, and feeds.
module AssetTagHelper
# Returns a link tag that browsers and news readers can use to auto-detect a RSS or ATOM feed for this page. The +type+ can
# either be <tt>:rss</tt> (default) or <tt>:atom</tt> and the +options+ follow the url_for style of declaring a link target.
#
# Examples:
# auto_discovery_link_tag # =>
# <link rel="alternate" type="application/rss+xml" title="RSS" href="http://www.curenthost.com/controller/action" />
# auto_discovery_link_tag(:atom) # =>
# <link rel="alternate" type="application/atom+xml" title="ATOM" href="http://www.curenthost.com/controller/action" />
# auto_discovery_link_tag(:rss, :action => "feed") # =>
# <link rel="alternate" type="application/atom+xml" title="ATOM" href="http://www.curenthost.com/controller/feed" />
def auto_discovery_link_tag(type = :rss, options = {})
tag(
"link", "rel" => "alternate", "type" => "application/#{type}+xml", "title" => type.to_s.upcase,
"href" => url_for(options.merge(:only_path => false))
)
end
# Returns path to a javascript asset. Example:
#
# javascript_path "xmlhr" # => /javascripts/xmlhr.js
def javascript_path(source)
compute_public_path(source, 'javascripts', 'js')
end
# Returns a script include tag per source given as argument. Examples:
#
# javascript_include_tag "xmlhr" # =>
# <script type="text/javascript" src="/javascripts/xmlhr.js"></script>
#
# javascript_include_tag "common.javascript", "/elsewhere/cools" # =>
# <script type="text/javascript" src="/javascripts/common.javascript"></script>
# <script type="text/javascript" src="/elsewhere/cools.js"></script>
def javascript_include_tag(*sources)
sources.collect { |source|
source = javascript_path(source)
content_tag("script", "", "type" => "text/javascript", "src" => source)
}.join("\n")
end
# Returns path to a stylesheet asset. Example:
#
# stylesheet_path "style" # => /stylesheets/style.css
def stylesheet_path(source)
compute_public_path(source, 'stylesheets', 'css')
end
# Returns a css link tag per source given as argument. Examples:
#
# stylesheet_link_tag "style" # =>
# <link href="/stylesheets/style.css" media="screen" 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" />
def stylesheet_link_tag(*sources)
sources.collect { |source|
source = stylesheet_path(source)
tag("link", "rel" => "Stylesheet", "type" => "text/css", "media" => "screen", "href" => source)
}.join("\n")
end
# Returns path to an image asset. Example:
#
# The +src+ can be supplied as a...
# * full path, like "/my_images/image.gif"
# * file name, like "rss.gif", that gets expanded to "/images/rss.gif"
# * file name without extension, like "logo", that gets expanded to "/images/logo.png"
def image_path(source)
compute_public_path(source, 'images', 'png')
end
# Returns an image tag converting the +options+ instead html options on the tag, but with these special cases:
#
# * <tt>:alt</tt> - If no alt text is given, the file name part of the +src+ is used (capitalized and without the extension)
# * <tt>:size</tt> - Supplied as "XxY", so "30x45" becomes width="30" and height="45"
#
# The +src+ can be supplied as a...
# * full path, like "/my_images/image.gif"
# * file name, like "rss.gif", that gets expanded to "/images/rss.gif"
# * file name without extension, like "logo", that gets expanded to "/images/logo.png"
def image_tag(source, options = {})
options.symbolize_keys
options[:src] = image_path(source)
options[:alt] ||= source.split("/").last.split(".").first.capitalize
if options[:size]
options[:width], options[:height] = options[:size].split("x")
options.delete :size
end
tag("img", options)
end
private
def compute_public_path(source, dir, ext)
source = "/#{dir}/#{source}" unless source.include?("/")
source = "#{source}.#{ext}" unless source.include?(".")
source = "#{@request.relative_url_root}#{source}"
defined?(RAILS_ASSET_HOST) ? RAILS_ASSET_HOST + source : source
end
end
end
end
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