Class: REXML::Entity

Inherits:
Child show all
Includes:
XMLTokens
Defined in:
lib/rexml/entity.rb

Overview

God, I hate DTDs. I really do. Why this idiot standard still plagues us is beyond me.

Constant Summary collapse

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
PEREFERENCE_RE =
/#{PEREFERENCE}/um

Constants included from XMLTokens

XMLTokens::NAME, XMLTokens::NAMECHAR, XMLTokens::NAME_STR, XMLTokens::NCNAME_STR, XMLTokens::NMTOKEN, XMLTokens::NMTOKENS, XMLTokens::REFERENCE

Instance Attribute Summary collapse

Attributes inherited from Child

#parent

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Child

#bytes, #document, #next_sibling=, #previous_sibling=, #remove, #replace_with

Methods included from Node

#each_recursive, #find_first_recursive, #indent, #index_in_parent, #next_sibling_node, #parent?, #previous_sibling_node

Constructor Details

#initialize(stream, value = nil, parent = nil, reference = false) ⇒ Entity

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', '&' )

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# File 'lib/rexml/entity.rb', line 35

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

Instance Attribute Details

#externalObject (readonly)

Returns the value of attribute external


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# File 'lib/rexml/entity.rb', line 23

def external
  @external
end

#nameObject (readonly)

Returns the value of attribute name


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# File 'lib/rexml/entity.rb', line 23

def name
  @name
end

#ndataObject (readonly)

Returns the value of attribute ndata


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# File 'lib/rexml/entity.rb', line 23

def ndata
  @ndata
end

#pubidObject (readonly)

Returns the value of attribute pubid


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# File 'lib/rexml/entity.rb', line 23

def pubid
  @pubid
end

#refObject (readonly)

Returns the value of attribute ref


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# File 'lib/rexml/entity.rb', line 23

def ref
  @ref
end

Class Method Details

.matches?(string) ⇒ Boolean

Evaluates whether the given string matchs an entity definition, returning true if so, and false otherwise.

Returns:

  • (Boolean)

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# File 'lib/rexml/entity.rb', line 68

def Entity::matches? string
  (ENTITYDECL =~ string) == 0
end

Instance Method Details

#normalizedObject

Returns the value of this entity unprocessed – raw. This is the normalized value; that is, with all %ent; and &ent; entities intact


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# File 'lib/rexml/entity.rb', line 87

def normalized
  @value
end

#to_sObject

Returns this entity as a string. See write().


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# File 'lib/rexml/entity.rb', line 121

def to_s
  rv = ''
  write rv
  rv
end

#unnormalizedObject

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.


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# File 'lib/rexml/entity.rb', line 75

def unnormalized
  document.record_entity_expansion unless document.nil?
  v = value()
  return nil if v.nil?
  @unnormalized = Text::unnormalize(v, parent)
  @unnormalized
end

#valueObject

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"

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# File 'lib/rexml/entity.rb', line 136

def value
  if @value
    matches = @value.scan(PEREFERENCE_RE)
    rv = @value.clone
    if @parent
      matches.each do |entity_reference|
        entity_value = @parent.entity( entity_reference[0] )
        rv.gsub!( /%#{entity_reference.join};/um, entity_value )
      end
    end
    return rv
  end
  nil
end

#write(out, indent = -1) ⇒ Object

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


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# File 'lib/rexml/entity.rb', line 99

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