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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>
def content_tag(name, content, options = nil)
"<#{name}#{tag_options(options.stringify_keys) if options}>#{content}</#{name}>"
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><![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 & 3")
# # => "1 < 2 & 3"
#
def escape_once(html)
fix_double_escape(html_escape(html.to_s))
end
private
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
end
end
end
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