Class: HTML5::HTMLTokenizer

Inherits:
Object
  • Object
show all
Defined in:
lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb

Overview

This class takes care of tokenizing HTML.

  • @current_token Holds the token that is currently being processed.

  • @state Holds a reference to the method to be invoked… XXX

  • @states Holds a mapping between states and methods that implement the state.

  • @stream Points to HTMLInputStream object.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(stream, options = {}) ⇒ HTMLTokenizer

XXX need to fix documentation



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 26

def initialize(stream, options = {})
  @stream = HTMLInputStream.new(stream, options)

  # Setup the initial tokenizer state
  @content_model_flag = :PCDATA
  @state              = :data_state
  @escapeFlag         = false
  @lastFourChars      = []

  # The current token being created
  @current_token = nil

  # Tokens to be processed.
  @token_queue             = []
  @lowercase_element_name = options[:lowercase_element_name] != false
  @lowercase_attr_name    = options[:lowercase_attr_name]    != false
end

Instance Attribute Details

#content_model_flag ⇒ Object

Returns the value of attribute content_model_flag.



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 21

def content_model_flag
  @content_model_flag
end

#current_token ⇒ Object

Returns the value of attribute current_token.



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 21

def current_token
  @current_token
end

#stream ⇒ Object (readonly)

Returns the value of attribute stream.



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 22

def stream
  @stream
end

Instance Method Details

#after_attribute_name_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 491

def after_attribute_name_state
  data = @stream.char
  if SPACE_CHARACTERS.include? data
    @stream.chars_until(SPACE_CHARACTERS, true)
  elsif data == "="
    @state = :before_attribute_value_state
  elsif data == ">"
    emit_current_token
  elsif data == :EOF
    @token_queue << {:type => :ParseError, :data => "expected-end-of-tag-but-got-eof"}
    emit_current_token
  elsif ASCII_LETTERS.include? data
    @current_token[:data].push([data, ""])
    @state = :attribute_name_state
  elsif data == "/"
    process_solidus_in_tag
    @state = :before_attribute_name_state
  else
    @current_token[:data].push([data, ""])
    @state = :attribute_name_state
  end
  return true
end

#after_doctype_name_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 762

def after_doctype_name_state
  data = @stream.char
  if SPACE_CHARACTERS.include? data
  elsif data == ">"
    @token_queue << @current_token
    @state = :data_state
  elsif data == :EOF
    @current_token[:correct] = false
    @stream.unget(data)
    @token_queue << {:type => :ParseError, :data => "eof-in-doctype"}
    @token_queue << @current_token
    @state = :data_state
  else
    char_stack = [data]  
    5.times { char_stack << stream.char }
    token = char_stack.join('').tr(ASCII_UPPERCASE,ASCII_LOWERCASE)
    if token == "public" and !char_stack.include?(:EOF)
      @state = :before_doctype_public_identifier_state
    elsif token == "system" and !char_stack.include?(:EOF)
      @state = :before_doctype_system_identifier_state
    else
      @stream.unget(char_stack)
      @token_queue << {:type => :ParseError, :data => "expected-space-or-right-bracket-in-doctype", "datavars" => {"data" => data}}
      @state = :bogus_doctype_state
    end
  end
  return true
end

#after_doctype_public_identifier_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 849

def after_doctype_public_identifier_state
  data = @stream.char
  if SPACE_CHARACTERS.include?(data)
  elsif data == "\""
    @current_token[:systemId] = ""
    @state = :doctype_system_identifier_double_quoted_state
  elsif data == "'"
    @current_token[:systemId] = ""
    @state = :doctype_system_identifier_single_quoted_state
  elsif data == ">"
    @token_queue << @current_token
    @state = :data_state
  elsif data == :EOF
    @token_queue << {:type => :ParseError, :data => "eof-in-doctype"}
    @current_token[:correct] = false
    @token_queue << @current_token
    @state = :data_state
  else
    @token_queue << {:type => :ParseError, :data => "eof-in-doctype"}
    @state = :bogus_doctype_state
  end
  return true
end

#after_doctype_system_identifier_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 929

def after_doctype_system_identifier_state
  data = @stream.char
  if SPACE_CHARACTERS.include?(data)
  elsif data == ">"
    @token_queue << @current_token
    @state = :data_state
  elsif data == :EOF
    @token_queue << {:type => :ParseError, :data => "eof-in-doctype"}
    @current_token[:correct] = false
    @token_queue << @current_token
    @state = :data_state
  else
    @token_queue << {:type => :ParseError, :data => "eof-in-doctype"}
    @state = :bogus_doctype_state
  end
  return true
end

#attribute_name_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 444

def attribute_name_state
  data = @stream.char
  leavingThisState = true
  emitToken = false
  if data == "="
    @state = :before_attribute_value_state
  elsif data == :EOF
    @token_queue << {:type => :ParseError, :data => "eof-in-attribute-name"}
    @state = :data_state
    emitToken = true
  elsif ASCII_LETTERS.include? data
    @current_token[:data][-1][0] += data + @stream.chars_until(ASCII_LETTERS, true)
    leavingThisState = false
  elsif data == ">"
    # XXX If we emit here the attributes are converted to a dict
    # without being checked and when the code below runs we error
    # because data is a dict not a list
    emitToken = true
  elsif SPACE_CHARACTERS.include? data
    @state = :after_attribute_name_state
  elsif data == "/"
    process_solidus_in_tag
    @state = :before_attribute_name_state
  else
    @current_token[:data][-1][0] += data
    leavingThisState = false
  end

  if leavingThisState
    # Attributes are not dropped at this stage. That happens when the
    # start tag token is emitted so values can still be safely appended
    # to attributes, but we do want to report the parse error in time.
    if @lowercase_attr_name
        @current_token[:data][-1][0] = @current_token[:data].last.first.downcase
    end
    @current_token[:data][0...-1].each {|name,value|
      if @current_token[:data].last.first == name
        @token_queue << {:type => :ParseError, :data => "duplicate-attribute"}
        break # don't report an error more than once
      end
    }
    # XXX Fix for above XXX
    emit_current_token if emitToken
  end
  return true
end

#attribute_value_double_quoted_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 538

def attribute_value_double_quoted_state
  data = @stream.char
  if data == "\""
    @state = :before_attribute_name_state
  elsif data == "&"
    process_entity_in_attribute
  elsif data == :EOF
    @token_queue << {:type => :ParseError, :data => "eof-in-attribute-value-double-quote"}
    emit_current_token
  else
    @current_token[:data][-1][1] += data + @stream.chars_until(["\"", "&"])
  end
  return true
end

#attribute_value_single_quoted_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 553

def attribute_value_single_quoted_state
  data = @stream.char
  if data == "'"
    @state = :before_attribute_name_state
  elsif data == "&"
    process_entity_in_attribute
  elsif data == :EOF
    @token_queue << {:type => :ParseError, :data => "eof-in-attribute-value-single-quote"}
    emit_current_token
  else
    @current_token[:data][-1][1] += data +\
      @stream.chars_until(["'", "&"])
  end
  return true
end

#attribute_value_unquoted_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 569

def attribute_value_unquoted_state
  data = @stream.char
  if SPACE_CHARACTERS.include? data
    @state = :before_attribute_name_state
  elsif data == "&"
    process_entity_in_attribute
  elsif data == ">"
    emit_current_token
  elsif data == :EOF
    @token_queue << {:type => :ParseError, :data => "eof-in-attribute-value-no-quotes"}
    emit_current_token
  else
    @current_token[:data][-1][1] += data +  @stream.chars_until(["&", ">","<"] + SPACE_CHARACTERS)
  end
  return true
end

#before_attribute_name_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 423

def before_attribute_name_state
  data = @stream.char
  if SPACE_CHARACTERS.include? data
    @stream.chars_until(SPACE_CHARACTERS, true)
  elsif data == :EOF
    @token_queue << {:type => :ParseError, :data => "expected-attribute-name-but-got-eof"}
    emit_current_token
  elsif ASCII_LETTERS.include? data
    @current_token[:data].push([data, ""])
    @state = :attribute_name_state
  elsif data == ">"
    emit_current_token
  elsif data == "/"
    process_solidus_in_tag
  else
    @current_token[:data].push([data, ""])
    @state = :attribute_name_state
  end
  return true
end

#before_attribute_value_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 515

def before_attribute_value_state
  data = @stream.char
  if SPACE_CHARACTERS.include? data
    @stream.chars_until(SPACE_CHARACTERS, true)
  elsif data == "\""
    @state = :attribute_value_double_quoted_state
  elsif data == "&"
    @state = :attribute_value_unquoted_state
    @stream.unget(data);
  elsif data == "'"
    @state = :attribute_value_single_quoted_state
  elsif data == ">"
    emit_current_token
  elsif data == :EOF
    @token_queue << {:type => :ParseError, :data => "expected-attribute-value-but-got-eof"}
    emit_current_token
  else
    @current_token[:data][-1][1] += data
    @state = :attribute_value_unquoted_state
  end
  return true
end

#before_doctype_name_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 723

def before_doctype_name_state
  data = @stream.char
  if SPACE_CHARACTERS.include? data
  elsif data == ">"
    @token_queue << {:type => :ParseError, :data => "expected-doctype-name-but-got-right-bracket"}
    @current_token[:correct] = false
    @token_queue << @current_token
    @state = :data_state
  elsif data == :EOF
    @token_queue << {:type => :ParseError, :data => "expected-doctype-name-but-got-eof"}
    @current_token[:correct] = false
    @token_queue << @current_token
    @state = :data_state
  else
    @current_token[:name] = data
    @state = :doctype_name_state
  end
  return true
end

#before_doctype_public_identifier_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 791

def before_doctype_public_identifier_state
  data = @stream.char

  if SPACE_CHARACTERS.include?(data)
  elsif data == "\""
    @current_token[:publicId] = ""
    @state = :doctype_public_identifier_double_quoted_state
  elsif data == "'"
    @current_token[:publicId] = ""
    @state = :doctype_public_identifier_single_quoted_state
  elsif data == ">"
    @token_queue << {:type => :ParseError, :data => "unexpected-end-of-doctype"}
    @current_token[:correct] = false
    @token_queue << @current_token
    @state = :data_state
  elsif data == :EOF
    @token_queue << {:type => :ParseError, :data => "eof-in-doctype"}
    @current_token[:correct] = false
    @token_queue << @current_token
    @state = :data_state
  else
    @token_queue << {:type => :ParseError, :data => "unexpected-char-in-doctype"}
    @state = :bogus_doctype_state
  end

  return true
end

#before_doctype_system_identifier_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 873

def before_doctype_system_identifier_state
  data = @stream.char
  if SPACE_CHARACTERS.include?(data)
  elsif data == "\""
    @current_token[:systemId] = ""
    @state = :doctype_system_identifier_double_quoted_state
  elsif data == "'"
    @current_token[:systemId] = ""
    @state = :doctype_system_identifier_single_quoted_state
  elsif data == ">"
    @token_queue << {:type => :ParseError, :data => "unexpected-char-in-doctype"}
    @current_token[:correct] = false
    @token_queue << @current_token
    @state = :data_state
  elsif data == :EOF
    @token_queue << {:type => :ParseError, :data => "eof-in-doctype"}
    @current_token[:correct] = false
    @token_queue << @current_token
    @state = :data_state
  else
    @token_queue << {:type => :ParseError, :data => "unexpected-char-in-doctype"}
    @state = :bogus_doctype_state
  end
  return true
end

#bogus_comment_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 586

def bogus_comment_state
  # Make a new comment token and give it as value all the characters
  # until the first > or :EOF (chars_until checks for :EOF automatically)
  # and emit it.
  @token_queue << {:type => :Comment, :data => @stream.chars_until((">"))}

  # Eat the character directly after the bogus comment which is either a
  # ">" or an :EOF.
  @stream.char
  @state = :data_state
  return true
end

#bogus_doctype_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 947

def bogus_doctype_state
  data = @stream.char
  @current_token[:correct] = false
  if data == ">"
    @token_queue << @current_token
    @state = :data_state
  elsif data == :EOF
    # XXX EMIT
    @stream.unget(data)
    @token_queue << {:type => :ParseError, :data => "eof-in-doctype"}
    @current_token[:correct] = false
    @token_queue << @current_token
    @state = :data_state
  end
  return true
end

#close_tag_open_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 343

def close_tag_open_state
  if (@content_model_flag == :RCDATA or @content_model_flag == :CDATA)
    if @current_token
      char_stack = []

      # So far we know that "</" has been consumed. We now need to know
      # whether the next few characters match the name of last emitted
      # start tag which also happens to be the current_token. We also need
      # to have the character directly after the characters that could
      # match the start tag name.
      (@current_token[:name].length + 1).times do
        char_stack.push(@stream.char)
        # Make sure we don't get hit by :EOF
        break if char_stack[-1] == :EOF
      end

      # Since this is just for checking. We put the characters back on
      # the stack.
      @stream.unget(char_stack)
    end

    if @current_token and
      @current_token[:name].downcase == 
      char_stack[0...-1].join('').downcase and
      (SPACE_CHARACTERS + [">", "/", "<", :EOF]).include? char_stack[-1]
      # Because the characters are correct we can safely switch to
      # PCDATA mode now. This also means we don't have to do it when
      # emitting the end tag token.
      @content_model_flag = :PCDATA
    else
      @token_queue << {:type => :Characters, :data => "</"}
      @state = :data_state

      # Need to return here since we don't want the rest of the
      # method to be walked through.
      return true
    end
  end

  data = @stream.char
  if data == :EOF
    @token_queue << {:type => :ParseError, :data => "expected-closing-tag-but-got-eof"}
    @token_queue << {:type => :Characters, :data => "</"}
    @state = :data_state
  elsif ASCII_LETTERS.include? data
    @current_token = {:type => :EndTag, :name => data, :data => []}
    @state = :tag_name_state
  elsif data == ">"
    @token_queue << {:type => :ParseError, :data => "expected-closing-tag-but-got-right-bracket"}
    @state = :data_state
  else
    # XXX data can be _'_...
    @token_queue << {:type => :ParseError, :data => "expected-closing-tag-but-got-char", :datavars => {:data => data}}
    @stream.unget(data)
    @state = :bogus_comment_state
  end

  return true
end

#comment_end_dash_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 671

def comment_end_dash_state
  data = @stream.char
  if data == "-"
    @state = :comment_end_state
  elsif data == :EOF
    @token_queue << {:type => :ParseError, :data => "eof-in-comment-end-dash"}
    @token_queue << @current_token
    @state = :data_state
  else
    @current_token[:data] += "-" + data +\
      @stream.chars_until("-")
    # Consume the next character which is either a "-" or an :EOF as
    # well so if there's a "-" directly after the "-" we go nicely to
    # the "comment end state" without emitting a ParseError there.
    @stream.char
  end
  return true
end

#comment_end_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 690

def comment_end_state
  data = @stream.char
  if data == ">"
    @token_queue << @current_token
    @state = :data_state
  elsif data == "-"
    @token_queue << {:type => :ParseError, :data => "unexpected-dash-after-double-dash-in-comment"}
    @current_token[:data] += data
  elsif data == :EOF
    @token_queue << {:type => :ParseError, :data => "eof-in-comment-double-dash"}
    @token_queue << @current_token
    @state = :data_state
  else
    # XXX
    @token_queue << {:type => :ParseError, :data => "unexpected-char-in-comment"}
    @current_token[:data] += "--" + data
    @state = :comment_state
  end
  return true
end

#comment_start_dash_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 638

def comment_start_dash_state
    data = @stream.char
    if data == "-"
        @state = :comment_end_state
    elsif data == ">"
        @token_queue << {:type => :ParseError, :data => "incorrect-comment"}
        @token_queue << @current_token
        @state = :data_state
    elsif data == :EOF
        @token_queue << {:type => :ParseError, :data => "eof-in-comment"}
        @token_queue << @current_token
        @state = :data_state
    else
        @current_token[:data] += '-' + data + @stream.chars_until("-")
        @state = :comment_state
    end
    return true
end

#comment_start_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 619

def comment_start_state
    data = @stream.char
    if data == "-"
        @state = :comment_start_dash_state
    elsif data == ">"
        @token_queue << {:type => :ParseError, :data => "incorrect-comment"}
        @token_queue << @current_token
        @state = :data_state
    elsif data == :EOF
        @token_queue << {:type => :ParseError, :data => "eof-in-comment"}
        @token_queue << @current_token
        @state = :data_state
    else
        @current_token[:data] += data + @stream.chars_until("-")
        @state = :comment_state
    end
    return true
end

#comment_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 657

def comment_state
  data = @stream.char
  if data == "-"
    @state = :comment_end_dash_state
  elsif data == :EOF
    @token_queue << {:type => :ParseError, :data => "eof-in-comment"}
    @token_queue << @current_token
    @state = :data_state
  else
    @current_token[:data] += data + @stream.chars_until("-")
  end
  return true
end

#consume_entity(from_attribute = false) ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 137

def consume_entity(from_attribute=false)
  char = nil
  char_stack = [@stream.char]
  if SPACE_CHARACTERS.include?(char_stack[0]) or [:EOF, '<', '&'].include?(char_stack[0])
    @stream.unget(char_stack)
  elsif char_stack[0] == '#'
    # We might have a number entity here.
    char_stack += [@stream.char, @stream.char]
    if char_stack[0 .. 1].include? :EOF
      # If we reach the end of the file put everything up to :EOF
      # back in the queue
      char_stack = char_stack[0...char_stack.index(:EOF)]
      @stream.unget(char_stack)
      @token_queue << {:type => :ParseError, :data => "expected-numeric-entity-but-got-eof"}
    else
      if char_stack[1].downcase == "x" and HEX_DIGITS.include? char_stack[2]
        # Hexadecimal entity detected.
        @stream.unget(char_stack[2])
        char = consume_number_entity(true)
      elsif DIGITS.include? char_stack[1]
        # Decimal entity detected.
        @stream.unget(char_stack[1..-1])
        char = consume_number_entity(false)
      else
        # No number entity detected.
        @stream.unget(char_stack)
        @token_queue << {:type => :ParseError, :data => "expected-numeric-entity"}
      end
    end
  else
    # At this point in the process might have named entity. Entities
    # are stored in the global variable "entities".
    #
    # Consume characters and compare to these to a substring of the
    # entity names in the list until the substring no longer matches.
    filteredEntityList = ENTITIES.keys
    filteredEntityList.reject! {|e| e[0].chr != char_stack[0]}
    entityName = nil

    # Try to find the longest entity the string will match to take care
    # of &noti for instance.
    while char_stack.last != :EOF
      name = char_stack.join('')
      if filteredEntityList.any? {|e| e[0...name.length] == name}
        filteredEntityList.reject! {|e| e[0...name.length] != name}
        char_stack.push(@stream.char)
      else
        break
      end

      if ENTITIES.include? name
        entityName = name
        break if entityName[-1] == ';'
      end
    end

    if entityName != nil
      char = ENTITIES[entityName]

      # Check whether or not the last character returned can be
      # discarded or needs to be put back.
      if entityName[-1] != ?;
        @token_queue << {:type => :ParseError, :data => "named-entity-without-semicolon"}
      end

      if entityName[-1] != ";" and from_attribute and
         (ASCII_LETTERS.include?(char_stack[entityName.length]) or
          DIGITS.include?(char_stack[entityName.length]))
        @stream.unget(char_stack)
        char = '&'
      else
        @stream.unget(char_stack[entityName.length..-1])
      end
    else
      @token_queue << {:type => :ParseError, :data => "expected-named-entity"}
      @stream.unget(char_stack)
    end
  end
  return char
end

#consume_number_entity(isHex) ⇒ Object

This function returns either U+FFFD or the character based on the decimal or hexadecimal representation. It also discards “;” if present. If not present @token_queue << => :ParseError“ is invoked.



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 84

def consume_number_entity(isHex)

  # XXX More need to be done here. For instance, #13 should prolly be
  # converted to #10 so we don't get \r (#13 is \r right?) in the DOM and
  # such. Thoughts on this appreciated.
  allowed = DIGITS
  radix = 10
  if isHex
    allowed = HEX_DIGITS
    radix = 16
  end

  char_stack = []

  # Consume all the characters that are in range while making sure we
  # don't hit an EOF.
  c = @stream.char
  while allowed.include?(c) and c != :EOF
    char_stack.push(c)
    c = @stream.char
  end

  # Convert the set of characters consumed to an int.
  charAsInt = char_stack.join('').to_i(radix)

  if charAsInt == 13
    @token_queue << {:type => :ParseError, :data => "incorrect-cr-newline-entity"}
    charAsInt = 10
  elsif (128..159).include? charAsInt
    # If the integer is between 127 and 160 (so 128 and bigger and 159
    # and smaller) we need to do the "windows trick".
    @token_queue << {:type => :ParseError, :data => "illegal-windows-1252-entity"}

    charAsInt = ENTITIES_WINDOWS1252[charAsInt - 128]
  end

  if 0 < charAsInt and charAsInt <= 1114111 and not (55296 <= charAsInt and charAsInt <= 57343)
    char = [charAsInt].pack('U')
  else
    char = [0xFFFD].pack('U')
    @token_queue << {:type => :ParseError, :data => "cant-convert-numeric-entity", :datavars => {"charAsInt" => charAsInt}}
  end

  # Discard the ; if present. Otherwise, put it back on the queue and
  # invoke parse_error on parser.
  if c != ";"
    @token_queue << {:type => :ParseError, :data => "numeric-entity-without-semicolon"}
    @stream.unget(c)
  end

  return char
end

#data_state ⇒ Object

XXX AT Perhaps we should have Hixie run some evaluation on billions of documents to figure out what the order of the various if and elsif statements should be.



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 249

def data_state
  data = @stream.char

  if @content_model_flag == :CDATA or @content_model_flag == :RCDATA
    @lastFourChars << data
    @lastFourChars.shift if @lastFourChars.length > 4
  end

  if data == "&" and [:PCDATA,:RCDATA].include?(@content_model_flag) and !@escapeFlag
      @state = :entity_data_state
  elsif data == "-" && [:CDATA, :RCDATA].include?(@content_model_flag) && !@escapeFlag && @lastFourChars.join('') == "<!--"
      @escapeFlag = true
      @token_queue << {:type => :Characters, :data => data}
  elsif data == "<" and !@escapeFlag and
    [:PCDATA,:CDATA,:RCDATA].include?(@content_model_flag)
      @state = :tag_open_state
  elsif data == ">" and @escapeFlag and 
    [:CDATA,:RCDATA].include?(@content_model_flag) and
    @lastFourChars[1..-1].join('') == "-->"
      @escapeFlag = false
      @token_queue << {:type => :Characters, :data => data}

  elsif data == :EOF
    # Tokenization ends.
    return false

  elsif SPACE_CHARACTERS.include? data
    # Directly after emitting a token you switch back to the "data
    # state". At that point SPACE_CHARACTERS are important so they are
    # emitted separately.
    # XXX need to check if we don't need a special "spaces" flag on
    # characters.
    @token_queue << {:type => :SpaceCharacters, :data => data + @stream.chars_until(SPACE_CHARACTERS, true)}
  else
    @token_queue << {:type => :Characters, :data => data + @stream.chars_until(%w[& < > -])}
  end
  return true
end

#doctype_name_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 743

def doctype_name_state
  data = @stream.char
  if SPACE_CHARACTERS.include? data
    @state = :after_doctype_name_state
  elsif data == ">"
    @token_queue << @current_token
    @state = :data_state
  elsif data == :EOF
    @token_queue << {:type => :ParseError, :data => "eof-in-doctype-name"}
    @current_token[:correct] = false
    @token_queue << @current_token
    @state = :data_state
  else
    @current_token[:name] += data
  end

  return true
end

#doctype_public_identifier_double_quoted_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 819

def doctype_public_identifier_double_quoted_state
  data = @stream.char
  if data == "\""
    @state = :after_doctype_public_identifier_state
  elsif data == :EOF
    @token_queue << {:type => :ParseError, :data => "eof-in-doctype"}
    @current_token[:correct] = false
    @token_queue << @current_token
    @state = :data_state
  else
    @current_token[:publicId] += data
  end
  return true
end

#doctype_public_identifier_single_quoted_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 834

def doctype_public_identifier_single_quoted_state
  data = @stream.char
  if data == "'"
    @state = :after_doctype_public_identifier_state
  elsif data == :EOF
    @token_queue << {:type => :ParseError, :data => "eof-in-doctype"}
    @current_token[:correct] = false
    @token_queue << @current_token
    @state = :data_state
  else
    @current_token[:publicId] += data
  end
  return true
end

#doctype_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 711

def doctype_state
  data = @stream.char
  if SPACE_CHARACTERS.include? data
    @state = :before_doctype_name_state
  else
    @token_queue << {:type => :ParseError, :data => "need-space-after-doctype"}
    @stream.unget(data)
    @state = :before_doctype_name_state
  end
  return true
end

#doctype_system_identifier_double_quoted_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 899

def doctype_system_identifier_double_quoted_state
  data = @stream.char
  if data == "\""
    @state = :after_doctype_system_identifier_state
  elsif data == :EOF
    @token_queue << {:type => :ParseError, :data => "eof-in-doctype"}
    @current_token[:correct] = false
    @token_queue << @current_token
    @state = :data_state
  else
    @current_token[:systemId] += data
  end
  return true
end

#doctype_system_identifier_single_quoted_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 914

def doctype_system_identifier_single_quoted_state
  data = @stream.char
  if data == "'"
    @state = :after_doctype_system_identifier_state
  elsif data == :EOF
    @token_queue << {:type => :ParseError, :data => "eof-in-doctype"}
    @current_token[:correct] = false
    @token_queue << @current_token
    @state = :data_state
  else
    @current_token[:systemId] += data
  end
  return true
end

#each ⇒ Object

This is where the magic happens.

We do our usually processing through the states and when we have a token to return we yield the token which pauses processing until the next token is requested.



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 49

def each
  @token_queue = []
  # Start processing. When EOF is reached @state will return false
  # instead of true and the loop will terminate.
  while send @state
    yield :type => :ParseError, :data => @stream.errors.shift until @stream.errors.empty?
    yield @token_queue.shift until @token_queue.empty?
  end
end

#emit_current_token ⇒ Object

This method is a generic handler for emitting the tags. It also sets the state to “data” because that’s what’s needed after a token has been emitted.



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 231

def emit_current_token
  # Add token to the queue to be yielded
  token = @current_token
  if [:StartTag, :EndTag, :EmptyTag].include?(token[:type])
    if @lowercase_element_name
      token[:name] = token[:name].downcase
    end
    @token_queue << token
    @state = :data_state
  end
  
end

#entity_data_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 288

def entity_data_state
  entity = consume_entity
  if entity
    @token_queue << {:type => :Characters, :data => entity}
  else
    @token_queue << {:type => :Characters, :data => "&"}
  end
  @state = :data_state
  return true
end

#markup_declaration_open_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 599

def markup_declaration_open_state
  char_stack = [@stream.char, @stream.char]
  if char_stack == ["-", "-"]
    @current_token = {:type => :Comment, :data => ""}
    @state = :comment_start_state
  else
    5.times { char_stack.push(@stream.char) }
    # Put in explicit :EOF check
    if !char_stack.include?(:EOF) && char_stack.join("").upcase == "DOCTYPE"
      @current_token = {:type => :Doctype, :name => "", :publicId => nil, :systemId => nil, :correct => true}
      @state = :doctype_state
    else
      @token_queue << {:type => :ParseError, :data => "expected-dashes-or-doctype"}
      @stream.unget(char_stack)
      @state = :bogus_comment_state
    end
  end
  return true
end

#process_entity_in_attribute ⇒ Object

This method replaces the need for “entityInAttributeValueState”.



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 219

def process_entity_in_attribute
  entity = consume_entity()
  if entity
    @current_token[:data][-1][1] += entity
  else
    @current_token[:data][-1][1] += "&"
  end
end

#process_solidus_in_tag ⇒ Object

If the next character is a ‘>’, convert the current_token into an EmptyTag



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 64

def process_solidus_in_tag

  # We need to consume another character to make sure it's a ">"
  data = @stream.char

  if @current_token[:type] == :StartTag and data == ">"
    @current_token[:type] = :EmptyTag
  else
    @token_queue << {:type => :ParseError, :data => "incorrectly-placed-solidus"}
  end

  # The character we just consumed need to be put back on the stack so it
  # doesn't get lost...
  @stream.unget(data)
end

#tag_name_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 403

def tag_name_state
  data = @stream.char
  if SPACE_CHARACTERS.include? data
    @state = :before_attribute_name_state
  elsif data == :EOF
    @token_queue << {:type => :ParseError, :data => "eof-in-tag-name"}
    emit_current_token
  elsif ASCII_LETTERS.include? data
    @current_token[:name] += data + @stream.chars_until(ASCII_LETTERS, true)
  elsif data == ">"
    emit_current_token
  elsif data == "/"
    process_solidus_in_tag
    @state = :before_attribute_name_state
  else
    @current_token[:name] += data
  end
  return true
end

#tag_open_state ⇒ Object 



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# File 'lib/feed_tools/vendor/html5/lib/html5/tokenizer.rb', line 299

def tag_open_state
  data = @stream.char
  if @content_model_flag == :PCDATA
    if data == "!"
      @state = :markup_declaration_open_state
    elsif data == "/"
      @state = :close_tag_open_state
    elsif data != :EOF and ASCII_LETTERS.include? data
      @current_token = {:type => :StartTag, :name => data, :data => []}
      @state = :tag_name_state
    elsif data == ">"
      # XXX In theory it could be something besides a tag name. But
      # do we really care?
      @token_queue << {:type => :ParseError, :data =>       "expected-tag-name-but-got-right-bracket"}
      @token_queue << {:type => :Characters, :data => "<>"}
      @state = :data_state
    elsif data == "?"
      # XXX In theory it could be something besides a tag name. But
      # do we really care?
      @token_queue.push({:type => :ParseError, :data => "expected-tag-name-but-got-question-mark"})
      @stream.unget(data)
      @state = :bogus_comment_state
    else
      # XXX
      @token_queue << {:type => :ParseError, :data => "expected-tag-name"}
      @token_queue << {:type => :Characters, :data => "<"}
      @stream.unget(data)
      @state = :data_state
    end
  else
    # We know the content model flag is set to either RCDATA or CDATA
    # now because this state can never be entered with the PLAINTEXT
    # flag.
    if data == "/"
      @state = :close_tag_open_state
    else
      @token_queue << {:type => :Characters, :data => "<"}
      @stream.unget(data)
      @state = :data_state
    end
  end
  return true
end