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Edit File : entity.rb \| Size : 5.40 KB
# frozen_string_literal: false require_relative 'child' require_relative 'source' require_relative 'xmltokens' module REXML 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. # # 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 matches 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><<</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 > Security.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 Back

Edit File : entity.rb | Size : 5.40 KB

# frozen_string_literal: false
require_relative 'child'
require_relative 'source'
require_relative 'xmltokens'

module REXML
  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.
    #
    #  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 matches 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 > Security.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

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