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