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require 'cgi'
require 'erb'
module ActionView
module Helpers #:nodoc:
# Provides methods to generate HTML tags programmatically when you can't use
# a Builder. By default, they output XHTML compliant tags.
module TagHelper
include ERB::Util
# Returns an empty HTML tag of type +name+ which by default is XHTML
# compliant. Setting +open+ to true will create an open tag compatible
# with HTML 4.0 and below. Add HTML attributes by passing an attributes
# hash to +options+.
#
# ==== Options
# The +options+ hash is used with attributes with no value like (<tt>disabled</tt> and
# <tt>readonly</tt>), which you can give a value of true in the +options+ hash. You can use
# symbols or strings for the attribute names.
#
# ==== Examples
# tag("br")
# # => <br />
#
# tag("br", nil, true)
# # => <br>
#
# tag("input", { :type => 'text', :disabled => true })
# # => <input type="text" disabled="disabled" />
#
# tag("img", { :src => "open.png" })
# # => <img src="open.png" />
def tag(name, options = nil, open = false)
"<#{name}#{tag_options(options) if options}" + (open ? ">" : " />")
end
# Returns an HTML block tag of type +name+ surrounding the +content+. Add
# HTML attributes by passing an attributes hash to +options+.
# Instead of passing the content as an argument, you can also use a block
# in which case, you pass your +options+ as the second parameter.
#
# ==== Options
# The +options+ hash is used with attributes with no value like (<tt>disabled</tt> and
# <tt>readonly</tt>), which you can give a value of true in the +options+ hash. You can use
# symbols or strings for the attribute names.
#
# ==== Examples
# content_tag(:p, "Hello world!")
# # => <p>Hello world!</p>
# content_tag(:div, content_tag(:p, "Hello world!"), :class => "strong")
# # => <div class="strong"><p>Hello world!</p></div>
# content_tag("select", options, :multiple => true)
# # => <select multiple="multiple">...options...</select>
#
# <% content_tag :div, :class => "strong" do -%>
# Hello world!
# <% end -%>
# # => <div class="strong"><p>Hello world!</p></div>
def content_tag(name, content_or_options_with_block = nil, options = nil, &block)
if block_given?
options = content_or_options_with_block if content_or_options_with_block.is_a?(Hash)
content = capture(&block)
content_tag = content_tag_string(name, content, options)
block_is_within_action_view?(block) ? concat(content_tag, block.binding) : content_tag
else
content = content_or_options_with_block
content_tag_string(name, content, options)
end
end
# Returns a CDATA section with the given +content+. CDATA sections
# are used to escape blocks of text containing characters which would
# otherwise be recognized as markup. CDATA sections begin with the string
# <tt><![CDATA[</tt> and end with (and may not contain) the string <tt>]]></tt>.
#
# ==== Examples
# cdata_section("<hello world>")
# # => <![CDATA[<hello world>]]>
#
# cdata_section(File.read("hello_world.txt"))
# # => <![CDATA[<hello from a text file]]>
def cdata_section(content)
"<![CDATA[#{content}]]>"
end
# Returns an escaped version of +html+ without affecting existing escaped entities.
#
# ==== Examples
# escape_once("1 > 2 & 3")
# # => "1 < 2 & 3"
#
# escape_once("<< Accept & Checkout")
# # => "<< Accept & Checkout"
def escape_once(html)
fix_double_escape(html_escape(html.to_s))
end
private
def content_tag_string(name, content, options)
tag_options = options ? tag_options(options) : ""
"<#{name}#{tag_options}>#{content}</#{name}>"
end
def tag_options(options)
cleaned_options = convert_booleans(options.stringify_keys.reject {|key, value| value.nil?})
' ' + cleaned_options.map {|key, value| %(#{key}="#{escape_once(value)}")}.sort * ' ' unless cleaned_options.empty?
end
def convert_booleans(options)
%w( disabled readonly multiple ).each { |a| boolean_attribute(options, a) }
options
end
def boolean_attribute(options, attribute)
options[attribute] ? options[attribute] = attribute : options.delete(attribute)
end
# Fix double-escaped entities, such as &amp;, &#123;, etc.
def fix_double_escape(escaped)
escaped.gsub(/&([a-z]+|(#\d+));/i) { "&#{$1};" }
end
def block_is_within_action_view?(block)
eval("defined? _erbout", block.binding)
end
end
end
end
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