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tag: v1.2.0_RC2
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require 'cgi'
require 'erb'
module ActionView
module Helpers
# This is poor man's Builder for the rare cases where you need to programmatically make tags but can't use Builder.
module TagHelper
include ERB::Util
# Examples:
# * <tt>tag("br") => <br /></tt>
# * <tt>tag("input", { "type" => "text"}) => <input type="text" /></tt>
def tag(name, options = nil, open = false)
"<#{name}#{tag_options(options.stringify_keys) if options}" + (open ? ">" : " />")
end
# Examples:
# * <tt>content_tag(:p, "Hello world!") => <p>Hello world!</p></tt>
# * <tt>content_tag(:div, content_tag(:p, "Hello world!"), :class => "strong") => </tt>
# <tt><div class="strong"><p>Hello world!</p></div></tt>
#
# ERb example:
# <% content_tag :div, :class => "strong" do -%>
# Hello world!
# <% end -%>
#
# Will output:
# <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)
concat(content_tag_string(name, content, options), block.binding)
else
content = content_or_options_with_block
content_tag_string(name, content, options)
end
end
# Returns a CDATA section for 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>&lt;![CDATA[</tt> and end with (and may not contain) the string
# <tt>]]></tt>.
def cdata_section(content)
"<![CDATA[#{content}]]>"
end
# Escapes a given string, while leaving any currently escaped entities alone.
#
# escape_once("1 > 2 &amp; 3")
# # => "1 &lt; 2 &amp; 3"
#
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.stringify_keys) : ""
"<#{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;amp;, &amp;#123;, etc.
def fix_double_escape(escaped)
escaped.gsub(/&amp;([a-z]+|(#\d+));/i) { "&#{$1};" }
end
end
end
end
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