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Contents
require 'erb'
require 'set'
# :stopdoc:
class ERB
module Util
HTML_ESCAPE = { '&' => '&', '"' => '"', '>' => '>', '<' => '<' }
def html_escape(s)
s.to_s.gsub(/[&\"><]/) { |special| HTML_ESCAPE[special] }
end
end
end
# :startdoc:
module Webby::Helpers
# Provides methods to generate HTML tags programmatically.
# By default, they output XHTML compliant tags.
#
module TagHelper
include ERB::Util
BOOLEAN_ATTRIBUTES = Set.new(%w(disabled readonly multiple))
# 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
def tag_options( options, escape = true )
unless options.empty?
attrs = []
if escape
options.each do |key, value|
next if value.nil?
key = key.to_s
value = BOOLEAN_ATTRIBUTES.include?(key) ? key : escape_once(value)
attrs << %Q(#{key}="#{value}")
end
else
attrs = options.map {|key, value| %Q(#{key}="#{value}")}
end
%Q( #{attrs.sort * ' '}) unless attrs.empty?
end
end
end # module TagHelper
register(TagHelper)
end # module Webby::Helpers
# EOF
Version data entries
22 entries across 22 versions & 9 rubygems