Class: HTMLTag

Inherits:
HTMLToken show all
Defined in:
lib/openid/yadis/htmltokenizer.rb

Overview

Class representing an HTML tag

Instance Attribute Summary collapse

Attributes inherited from HTMLToken

#raw

Instance Method Summary collapse

Methods inherited from HTMLToken

#==, #to_s, #trimmed_text

Constructor Details

#initialize(text) ⇒ HTMLTag

Returns a new instance of HTMLTag.

Raises:



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# File 'lib/openid/yadis/htmltokenizer.rb', line 218

def initialize(text)
  super
  if "<" != text[0] or ">" != text[-1]
    raise HTMLTokenizerError, "Text passed to HTMLComment.initialize is not a comment"
  end

  @attr_hash = {}
  @raw = text

  tag_name = text.scan(/[\w:-]+/)[0]
  raise HTMLTokenizerError, "Error, tag is nil: #{tag_name}" if tag_name.nil?

  if "/" == text[1]
    # It's an end tag
    @end_tag = true
    @tag_name = "/" + tag_name.downcase
  else
    @end_tag = false
    @tag_name = tag_name.downcase
  end

  @hashed = false
end

Instance Attribute Details

#end_tag ⇒ Object (readonly)

Returns the value of attribute end_tag.



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# File 'lib/openid/yadis/htmltokenizer.rb', line 216

def end_tag
  @end_tag
end

#tag_name ⇒ Object (readonly)

Returns the value of attribute tag_name.



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# File 'lib/openid/yadis/htmltokenizer.rb', line 216

def tag_name
  @tag_name
end

Instance Method Details

#attr_hash ⇒ Object

Retrieve a hash of all the tag’s attributes. Lazily done, so that if you don’t look at a tag’s attributes things go quicker



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# File 'lib/openid/yadis/htmltokenizer.rb', line 245

def attr_hash
  # Lazy initialize == don't build the hash until it's needed
  unless @hashed
    unless @end_tag
      # Get the attributes
      attr_arr = @raw.scan(%r{<[\w:-]+\s+(.*?)/?>}m)[0]
      if attr_arr.is_a?(Array)
        # Attributes found, parse them
        attrs = attr_arr[0]
        attr_arr = attrs.scan(/\s*([\w:-]+)(?:\s*=\s*("[^"]*"|'[^']*'|([^"'>][^\s>]*)))?/m)
        # clean up the array by:
        # * setting all nil elements to true
        # * removing enclosing quotes
        attr_arr.each do |item|
          val = if item[1].nil?
            item[0]
          elsif '"'[0] == item[1][0] or "'"[0] == item[1][0]
            item[1][1..-2]
          else
            item[1]
          end
          @attr_hash[item[0].downcase] = val
        end
      end
    end
    @hashed = true
  end

  # p self

  @attr_hash
end

#text ⇒ Object

Get the ‘alt’ text for a tag, if it exists, or an empty string otherwise



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# File 'lib/openid/yadis/htmltokenizer.rb', line 279

def text
  unless end_tag
    case tag_name
    when "img"
      return attr_hash["alt"] unless attr_hash["alt"].nil?
    when "applet"
      return attr_hash["alt"] unless attr_hash["alt"].nil?
    end
  end
  ""
end