--- /dev/null
+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 checked).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 & shut.png" />
+ #
+ # tag("img", { :src => "open & shut.png" }, false, false)
+ # # => <img src="open & 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">Hello world!</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 & 3")
+ # # => "1 < 2 & 3"
+ #
+ # escape_once("<< Accept & Checkout")
+ # # => "<< Accept & 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_pair do |key, value|
+ if BOOLEAN_ATTRIBUTES.include?(key)
+ attrs << %(#{key}="#{key}") if value
+ else
+ attrs << %(#{key}="#{escape_once(value)}") if !value.nil?
+ end
+ end
+ else
+ attrs = options.map { |key, value| %(#{key}="#{value}") }
+ end
+ " #{attrs.sort * ' '}" unless attrs.empty?
+ end
+ end
+ end
+ end
+end
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