instiki/lib/chunks/chunk.rb

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#require 'uri/common'
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# 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
# Rails's default utf-8 support causes problems here. So, for Chunk::Abstract class, turn off
# multibyte character support.
$KCODE = 'n' unless ''.respond_to?(:force_encoding)
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# automatically construct the array of derivatives of Chunk::Abstract
@derivatives = []
class << self
attr_reader :derivatives
end
def self::inherited( klass )
Abstract::derivatives << klass
end
# the class name part of the mask strings
def self.mask_string
self.to_s.delete(':').downcase
end
# a regexp that matches all chunk_types masks
def Abstract::mask_re(chunk_types)
chunk_classes = chunk_types.map{|klass| klass.mask_string}.join("|")
/chunk(-?\d+)(#{chunk_classes})chunk/
end
attr_reader :text, :unmask_text, :unmask_mode
def initialize(match_data, content)
@text = match_data[0]
@content = content
@unmask_mode = :normal
end
# Find all the chunks of the given type in content
# Each time the pattern is matched, create a new
# chunk for it, and replace the occurance of the chunk
# in this content with its mask.
def self.apply_to(content)
content.gsub!( self.pattern ) do |match|
new_chunk = self.new($~, content)
content.add_chunk(new_chunk)
new_chunk.mask
end
end
# should contain only [a-z0-9]
def mask
@mask ||= "chunk#{self.object_id}#{self.class.mask_string}chunk"
end
def unmask
@content.sub!(mask){|s| s.replace @unmask_text}
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end
def rendered?
@unmask_mode == :normal
end
def escaped?
@unmask_mode == :escape
end
def revert
@content.sub!(mask){|s| s.replace @text}
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# unregister
@content.delete_chunk(self)
end
end
end