require 'digest/md5' require 'uri/common' # A chunk is a pattern of text that can be protected # and interrogated by a renderer. Each Chunk class has a # +pattern+ that states what sort of text it matches. # Chunks are initalized by passing in the result of a # match by its pattern. module Chunk class Abstract attr_reader :text def initialize(match_data) @text = match_data[0] end # Find all the chunks of the given type in content # Each time the pattern is matched, create a new # chunk for it, and replace the occurance of the chunk # in this content with its mask. def self.apply_to(content) content.gsub!( self.pattern ) do |match| content.chunks << self.new($~) content.chunks.last.mask(content) end end def pre_mask() "chunk#{self.object_id}start " end def post_mask() " chunk#{self.object_id}end" end def mask(content) "chunk#{self.object_id}chunk" end def revert(content) content.sub!( Regexp.new(mask(content)), text ) end def unmask(content) self if revert(content) end end end