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require 'rexml/child'
require 'rexml/source'
require 'rexml/xmltokens'

module REXML
  # God, I hate DTDs.  I really do.  Why this idiot standard still
  # plagues us is beyond me.
  class Entity < Child
    include XMLTokens
    PUBIDCHAR = "\x20\x0D\x0Aa-zA-Z0-9\\-()+,./:=?;!*@$_%#"
    SYSTEMLITERAL = %Q{((?:"[^"]*")|(?:'[^']*'))}
    PUBIDLITERAL = %Q{("[#{PUBIDCHAR}']*"|'[#{PUBIDCHAR}]*')}
    EXTERNALID = "(?:(?:(SYSTEM)\\s+#{SYSTEMLITERAL})|(?:(PUBLIC)\\s+#{PUBIDLITERAL}\\s+#{SYSTEMLITERAL}))"
    NDATADECL = "\\s+NDATA\\s+#{NAME}"
    PEREFERENCE = "%#{NAME};"
    ENTITYVALUE = %Q{((?:"(?:[^%&"]|#{PEREFERENCE}|#{REFERENCE})*")|(?:'([^%&']|#{PEREFERENCE}|#{REFERENCE})*'))}
    PEDEF = "(?:#{ENTITYVALUE}|#{EXTERNALID})"
    ENTITYDEF = "(?:#{ENTITYVALUE}|(?:#{EXTERNALID}(#{NDATADECL})?))"
    PEDECL = "<!ENTITY\\s+(%)\\s+#{NAME}\\s+#{PEDEF}\\s*>"
    GEDECL = "<!ENTITY\\s+#{NAME}\\s+#{ENTITYDEF}\\s*>"
    ENTITYDECL = /\s*(?:#{GEDECL})|(?:#{PEDECL})/um

    attr_reader :name, :external, :ref, :ndata, :pubid

    # Create a new entity.  Simple entities can be constructed by passing a
    # name, value to the constructor; this creates a generic, plain entity
    # reference. For anything more complicated, you have to pass a Source to
    # the constructor with the entity definition, or use the accessor methods.
    # +WARNING+: There is no validation of entity state except when the entity
    # is read from a stream.  If you start poking around with the accessors,
    # you can easily create a non-conformant Entity.  The best thing to do is
    # dump the stupid DTDs and use XMLSchema instead.
    #
    #  e = Entity.new( 'amp', '&' )
    def initialize stream, value=nil, parent=nil, reference=false
      super(parent)
      @ndata = @pubid = @value = @external = nil
      if stream.kind_of? Array
        @name = stream[1]
        if stream[-1] == '%'
          @reference = true
          stream.pop
        else
          @reference = false
        end
        if stream[2] =~ /SYSTEM|PUBLIC/
          @external = stream[2]
          if @external == 'SYSTEM'
            @ref = stream[3]
            @ndata = stream[4] if stream.size == 5
          else
            @pubid = stream[3]
            @ref = stream[4]
          end
        else
          @value = stream[2]
        end
      else
        @reference = reference
        @external = nil
        @name = stream
        @value = value
      end
    end

    # Evaluates whether the given string matchs an entity definition,
    # returning true if so, and false otherwise.
    def Entity::matches? string
      (ENTITYDECL =~ string) == 0
    end

    # Evaluates to the unnormalized value of this entity; that is, replacing
    # all entities -- both %ent; and &ent; entities.  This differs from
    # +value()+ in that +value+ only replaces %ent; entities.
    def unnormalized
      document.record_entity_expansion unless document.nil?
      v = value()
      return nil if v.nil?
      @unnormalized = Text::unnormalize(v, parent)
      @unnormalized
    end

    #once :unnormalized

    # Returns the value of this entity unprocessed -- raw.  This is the
    # normalized value; that is, with all %ent; and &ent; entities intact
    def normalized
      @value
    end

    # Write out a fully formed, correct entity definition (assuming the Entity
    # object itself is valid.)
    #
    # out::
    #   An object implementing <TT>&lt;&lt;<TT> to which the entity will be
    #   output
    # indent::
    #   *DEPRECATED* and ignored
    def write out, indent=-1
      out << '<!ENTITY '
      out << '% ' if @reference
      out << @name
      out << ' '
      if @external
        out << @external << ' '
        if @pubid
          q = @pubid.include?('"')?"'":'"'
          out << q << @pubid << q << ' '
        end
        q = @ref.include?('"')?"'":'"'
        out << q << @ref << q
        out << ' NDATA ' << @ndata if @ndata
      else
        q = @value.include?('"')?"'":'"'
        out << q << @value << q
      end
      out << '>'
    end

    # Returns this entity as a string.  See write().
    def to_s
      rv = ''
      write rv
      rv
    end

    PEREFERENCE_RE = /#{PEREFERENCE}/um
    # Returns the value of this entity.  At the moment, only internal entities
    # are processed.  If the value contains internal references (IE,
    # %blah;), those are replaced with their values.  IE, if the doctype
    # contains:
    #  <!ENTITY % foo "bar">
    #  <!ENTITY yada "nanoo %foo; nanoo>
    # then:
    #  doctype.entity('yada').value   #-> "nanoo bar nanoo"
    def value
      if @value
        matches = @value.scan(PEREFERENCE_RE)
        rv = @value.clone
        if @parent
          sum = 0
          matches.each do |entity_reference|
            entity_value = @parent.entity( entity_reference[0] )
            if sum + entity_value.bytesize > Document.entity_expansion_text_limit
              raise "entity expansion has grown too large"
            else
              sum += entity_value.bytesize
            end
            rv.gsub!( /%#{entity_reference.join};/um, entity_value )
          end
        end
        return rv
      end
      nil
    end
  end

  # This is a set of entity constants -- the ones defined in the XML
  # specification.  These are +gt+, +lt+, +amp+, +quot+ and +apos+.
  # CAUTION: these entities does not have parent and document
  module EntityConst
    # +>+
    GT = Entity.new( 'gt', '>' )
    # +<+
    LT = Entity.new( 'lt', '<' )
    # +&+
    AMP = Entity.new( 'amp', '&' )
    # +"+
    QUOT = Entity.new( 'quot', '"' )
    # +'+
    APOS = Entity.new( 'apos', "'" )
  end
end

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