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require "rexml/namespace"
require 'rexml/text'

module REXML
  # Defines an Element Attribute; IE, a attribute=value pair, as in:
  # <element attribute="value"/>.  Attributes can be in their own
  # namespaces.  General users of REXML will not interact with the
  # Attribute class much.
  class Attribute
    include Node
    include Namespace

    # The element to which this attribute belongs
    attr_reader :element
    # The normalized value of this attribute.  That is, the attribute with
    # entities intact.
    attr_writer :normalized
    PATTERN = /\s*(#{NAME_STR})\s*=\s*(["'])(.*?)\2/um

    NEEDS_A_SECOND_CHECK = /(<|&((#{Entity::NAME});|(#0*((?:\d+)|(?:x[a-fA-F0-9]+)));)?)/um

    # Constructor.
    # FIXME: The parser doesn't catch illegal characters in attributes
    #
    # first::
    #   Either: an Attribute, which this new attribute will become a
    #   clone of; or a String, which is the name of this attribute
    # second::
    #   If +first+ is an Attribute, then this may be an Element, or nil.
    #   If nil, then the Element parent of this attribute is the parent
    #   of the +first+ Attribute.  If the first argument is a String,
    #   then this must also be a String, and is the content of the attribute.
    #   If this is the content, it must be fully normalized (contain no
    #   illegal characters).
    # parent::
    #   Ignored unless +first+ is a String; otherwise, may be the Element
    #   parent of this attribute, or nil.
    #
    #
    #  Attribute.new( attribute_to_clone )
    #  Attribute.new( attribute_to_clone, parent_element )
    #  Attribute.new( "attr", "attr_value" )
    #  Attribute.new( "attr", "attr_value", parent_element )
    def initialize( first, second=nil, parent=nil )
      @normalized = @unnormalized = @element = nil
      if first.kind_of? Attribute
        self.name = first.expanded_name
        @unnormalized = first.value
        if second.kind_of? Element
          @element = second
        else
          @element = first.element
        end
      elsif first.kind_of? String
        @element = parent
        self.name = first
        @normalized = second.to_s
      else
        raise "illegal argument #{first.class.name} to Attribute constructor"
      end
    end

    # Returns the namespace of the attribute.
    #
    #  e = Element.new( "elns:myelement" )
    #  e.add_attribute( "nsa:a", "aval" )
    #  e.add_attribute( "b", "bval" )
    #  e.attributes.get_attribute( "a" ).prefix   # -> "nsa"
    #  e.attributes.get_attribute( "b" ).prefix   # -> "elns"
    #  a = Attribute.new( "x", "y" )
    #  a.prefix                                   # -> ""
    def prefix
      pf = super
      if pf == ""
        pf = @element.prefix if @element
      end
      pf
    end

    # Returns the namespace URL, if defined, or nil otherwise
    #
    #  e = Element.new("el")
    #  e.add_attributes({"xmlns:ns", "http://url"})
    #  e.namespace( "ns" )              # -> "http://url"
    def namespace arg=nil
      arg = prefix if arg.nil?
      @element.namespace arg
    end

    # Returns true if other is an Attribute and has the same name and value,
    # false otherwise.
    def ==( other )
      other.kind_of?(Attribute) and other.name==name and other.value==value
    end

    # Creates (and returns) a hash from both the name and value
    def hash
      name.hash + value.hash
    end

    # Returns this attribute out as XML source, expanding the name
    #
    #  a = Attribute.new( "x", "y" )
    #  a.to_string     # -> "x='y'"
    #  b = Attribute.new( "ns:x", "y" )
    #  b.to_string     # -> "ns:x='y'"
    def to_string
      if @element and @element.context and @element.context[:attribute_quote] == :quote
        %Q^#@expanded_name="#{to_s().gsub(/"/, '&quote;')}"^
      else
        "#@expanded_name='#{to_s().gsub(/'/, '&apos;')}'"
      end
    end

    def doctype
      if @element
        doc = @element.document
        doc.doctype if doc
      end
    end

    # Returns the attribute value, with entities replaced
    def to_s
      return @normalized if @normalized

      @normalized = Text::normalize( @unnormalized, doctype )
      @unnormalized = nil
      @normalized
    end

    # Returns the UNNORMALIZED value of this attribute.  That is, entities
    # have been expanded to their values
    def value
      return @unnormalized if @unnormalized
      @unnormalized = Text::unnormalize( @normalized, doctype )
      @normalized = nil
      @unnormalized
    end

    # Returns a copy of this attribute
    def clone
      Attribute.new self
    end

    # Sets the element of which this object is an attribute.  Normally, this
    # is not directly called.
    #
    # Returns this attribute
    def element=( element )
      @element = element

      if @normalized
        Text.check( @normalized, NEEDS_A_SECOND_CHECK, doctype )
      end

      self
    end

    # Removes this Attribute from the tree, and returns true if successfull
    #
    # This method is usually not called directly.
    def remove
      @element.attributes.delete self.name unless @element.nil?
    end

    # Writes this attribute (EG, puts 'key="value"' to the output)
    def write( output, indent=-1 )
      output << to_string
    end

    def node_type
      :attribute
    end

    def inspect
      rv = ""
      write( rv )
      rv
    end

    def xpath
      path = @element.xpath
      path += "/@#{self.expanded_name}"
      return path
    end
  end
end
#vim:ts=2 sw=2 noexpandtab:

Filemanager

DIR : / usr/ share/ ruby/ rexml/
Name Type Size Permission Actions
dtd Folder 0755
formatters Folder 0755
light Folder 0755
parsers Folder 0755
validation Folder 0755
attlistdecl.rb File 1.89 KB 0644
attribute.rb File 5.39 KB 0644
cdata.rb File 1.54 KB 0644
child.rb File 2.63 KB 0644
comment.rb File 2.14 KB 0644
doctype.rb File 6.58 KB 0644
document.rb File 9.52 KB 0644
element.rb File 43.85 KB 0644
encoding.rb File 1.13 KB 0644
entity.rb File 5.53 KB 0644
functions.rb File 11.27 KB 0644
instruction.rb File 2.01 KB 0644
namespace.rb File 1.09 KB 0644
node.rb File 2.13 KB 0644
output.rb File 519 B 0644
parent.rb File 4.33 KB 0644
parseexception.rb File 1.22 KB 0644
quickpath.rb File 9.08 KB 0644
rexml.rb File 1.65 KB 0644
sax2listener.rb File 3.6 KB 0644
source.rb File 7.6 KB 0644
streamlistener.rb File 3.88 KB 0644
syncenumerator.rb File 685 B 0644
text.rb File 13.57 KB 0644
undefinednamespaceexception.rb File 210 B 0644
xmldecl.rb File 2.68 KB 0644
xmltokens.rb File 526 B 0644
xpath.rb File 3.31 KB 0644
xpath_parser.rb File 25.7 KB 0644