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require 'cgi'
require 'erb'
require 'set'
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
BOOLEAN_ATTRIBUTES = %w(disabled readonly multiple).to_set
BOOLEAN_ATTRIBUTES.merge(BOOLEAN_ATTRIBUTES.map(&:to_sym))
# Returns an empty HTML tag of type +name+ which by default is XHTML
# compliant. Set +open+ to true to create an open tag compatible
# with HTML 4.0 and below. Add HTML attributes by passing an attributes
# hash to +options+. Set +escape+ to false to disable attribute value
# escaping.
#
# ==== 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 & shut.png" })
# # => <img src="open &amp; shut.png" />
#
# tag("img", { :src => "open &amp; shut.png" }, false, false)
# # => <img src="open &amp; shut.png" />
def tag(name, options = nil, open = false, escape = true)
"<#{name}#{tag_options(options, escape) 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.
# Set escape to false to disable attribute value escaping.
#
# ==== 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, escape = true, &block)
if block_given?
options = content_or_options_with_block if content_or_options_with_block.is_a?(Hash)
content_tag = content_tag_string(name, capture(&block), options, escape)
if block_called_from_erb?(block)
concat(content_tag)
else
content_tag
end
else
content_tag_string(name, content_or_options_with_block, options, escape)
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 &amp; 3")
# # => "1 &lt; 2 &amp; 3"
#
# escape_once("&lt;&lt; Accept & Checkout")
# # => "&lt;&lt; Accept &amp; Checkout"
def escape_once(html)
html.to_s.gsub(/[\"><]|&(?!([a-zA-Z]+|(#\d+));)/) { |special| ERB::Util::HTML_ESCAPE[special] }
end
private
BLOCK_CALLED_FROM_ERB = 'defined? __in_erb_template'
if RUBY_VERSION < '1.9.0'
# Check whether we're called from an erb template.
# We'd return a string in any other case, but erb <%= ... %>
# can't take an <% end %> later on, so we have to use <% ... %>
# and implicitly concat.
def block_called_from_erb?(block)
block && eval(BLOCK_CALLED_FROM_ERB, block)
end
else
def block_called_from_erb?(block)
block && eval(BLOCK_CALLED_FROM_ERB, block.binding)
end
end
def content_tag_string(name, content, options, escape = true)
tag_options = tag_options(options, escape) if options
"<#{name}#{tag_options}>#{content}</#{name}>"
end
def tag_options(options, escape = true)
unless options.blank?
attrs = []
if escape
options.each do |key, value|
next unless value
value = BOOLEAN_ATTRIBUTES.include?(key) ? key : escape_once(value)
attrs << %(#{key}="#{value}")
end
else
attrs = options.map { |key, value| %(#{key}="#{value}") }
end
" #{attrs.sort * ' '}" unless attrs.empty?
end
end
end
end
end
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