Class: ENML_Listener

Inherits:
Object
  • Object
show all
Includes:
REXML::SAX2Listener
Defined in:
lib/enml-utils.rb

Instance Method Summary collapse

Constructor Details

#initialize(resources, to_text, static_dirs, note_guid) ⇒ ENML_Listener

Returns a new instance of ENML_Listener.



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# File 'lib/enml-utils.rb', line 20

def initialize(resources, to_text, static_dirs, note_guid)
  @to_text = to_text
  @files = []
  @resources = resources || []
  @dirs = static_dirs
  @note_guid = note_guid
  @resource_index = {}
  @resources.each do |res|
    hash = Digest.hexencode(res.data.bodyHash)
    @resource_index[hash] = res
    verbose "Stored index for resource with hash #{hash}"
  end
end

Instance Method Details

#characters(text) ⇒ Object 



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# File 'lib/enml-utils.rb', line 126

def characters(text)
  @stack[-1].add_text(text)
end

#end_document ⇒ Object 



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# File 'lib/enml-utils.rb', line 130

def end_document
  @output = ""
  @stack[-1].write(@output)
  decoder = HTMLEntities.new
  # One pass of entity decoding for HTML output...
  @output = decoder.decode(@output)
  if @to_text
    # Clean up some tags, extra empty lines, prettyfied characters, etc.
    @output.gsub!(/<\/?span[^>]*>/, '')
    @output.gsub!(/\t*<div[^>]*>/, '')
    @output.gsub!(/<\/div>/, "\n")
    @output.gsub!(/^\s+$/, '')
    @output.gsub!(/\n+/, "\n")
    @output.gsub!(/<br[^>]*\/>/, "\n")
    @output.gsub!(/“/, '"')
    @output.gsub!(/”/, '"')
    @output.gsub!(/‘/, "'")
    @output.gsub!(/’/, "'")
    @output.gsub!(/\u{a0}/, " ")  # Unicode non-breaking space
    # ...two passes of decoding for text output.
    @output = decoder.decode(@output)
  end
end

#end_element(uri, localname, qname) ⇒ Object 



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# File 'lib/enml-utils.rb', line 121

def end_element(uri, localname, qname)
  new_elem = @stack.pop
  @stack[-1].add_element(new_elem) unless new_elem.nil?
end

#files ⇒ Object 



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# File 'lib/enml-utils.rb', line 157

def files
  @files
end

#output ⇒ Object 



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# File 'lib/enml-utils.rb', line 154

def output
  @output
end

#process_file(attributes, type, subtype) ⇒ Object 



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# File 'lib/enml-utils.rb', line 39

def process_file(attributes, type, subtype)
  resource = @resource_index[attributes['hash']]
  if resource.nil?
    error "An error occurred - I don't have a resource with hash #{attributes['hash']}"
    return nil
  else
    new_file = {}
    if (!resource.attributes.nil? && !resource.attributes.fileName.nil?)
      new_file[:basename] = resource.attributes.fileName
    else
      new_file[:basename] = "#{attributes['hash']}.#{subtype}"
    end
    if @dirs[type]
      new_file[:fname] = "#{@dirs[type][0]}/#{attributes['hash']}/#{new_file[:basename]}"
      new_file[:url] = "#{@dirs[type][1]}/#{attributes['hash']}/#{new_file[:basename]}"
    end
    new_file[:data] = resource.data.body
    return new_file
  end
end

#start_document ⇒ Object 



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# File 'lib/enml-utils.rb', line 34

def start_document
  @outdoc = Document.new
  @stack = [@outdoc]
end

#start_element(uri, localname, qname, attributes) ⇒ Object 



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# File 'lib/enml-utils.rb', line 60

def start_element(uri, localname, qname, attributes)
  new_elem = nil
  if localname == 'en-note'
    # Convert <en-note> to <span>
    new_elem = Element.new('span')
    new_elem.add_attributes(attributes)
  elsif localname == 'en-todo'
    unless @to_text
      new_elem = Element.new('input')
      new_elem.add_attribute('type', 'checkbox')
      if attributes and attributes['checked'] == 'true'
        new_elem.add_attribute('checked', 'checked')
      end
    else
      if attributes and attributes['checked'] == 'true'
        @stack[-1].add_text("[x] ")
      else
        @stack[-1].add_text("[ ] ")
      end
    end
  elsif localname == 'en-media'
    if attributes['type'] =~ /^image\/(.+)/
      subtype = $1
      new_file = process_file(attributes, 'image', subtype)
      if new_file
        new_elem = Element.new('img')
        new_elem.add_attributes(attributes)
        new_elem.add_attribute('src', new_file[:url])
        @files.push(new_file)
      end
    elsif attributes['type'] =~ /^(audio|video)\/(.*)/
      type = $1
      subtype = $2
      new_file = process_file(attributes, type, subtype)
      if new_file
        new_elem = Element.new(type)
        new_elem.add_attribute('controls', "1")
        new_elem.add_element 'source', { 'src' => new_file[:url], 'type' => attributes['type'] }
        new_elem.add_text "Sorry, your browser does not support the #{type} tag."
        @files.push(new_file)
      end
    elsif attributes['type'] =~ /^(\S+)\/(\S+)/
      type = $1
      subtype = $2
      new_file = process_file(attributes, 'files', subtype)
      if new_file
        new_elem = Element.new('a')
        new_elem.add_attribute('href', new_file[:url])
        new_elem.add_text(new_file[:basename])
        @files.push(new_file)
      end
    else
      error "Sorry, I don't know how to handle attachments of this type: #{attributes['type']}"
    end
  else
    new_elem = Element.new(localname)
    new_elem.add_attributes(attributes)
  end
  @stack.push(new_elem)
end