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| Current File : //usr/share/ruby/rexml/doctype.rb |
require "rexml/parent"
require "rexml/parseexception"
require "rexml/namespace"
require 'rexml/entity'
require 'rexml/attlistdecl'
require 'rexml/xmltokens'
module REXML
# Represents an XML DOCTYPE declaration; that is, the contents of <!DOCTYPE
# ... >. DOCTYPES can be used to declare the DTD of a document, as well as
# being used to declare entities used in the document.
class DocType < Parent
include XMLTokens
START = "<!DOCTYPE"
STOP = ">"
SYSTEM = "SYSTEM"
PUBLIC = "PUBLIC"
DEFAULT_ENTITIES = {
'gt'=>EntityConst::GT,
'lt'=>EntityConst::LT,
'quot'=>EntityConst::QUOT,
"apos"=>EntityConst::APOS
}
# name is the name of the doctype
# external_id is the referenced DTD, if given
attr_reader :name, :external_id, :entities, :namespaces
# Constructor
#
# dt = DocType.new( 'foo', '-//I/Hate/External/IDs' )
# # <!DOCTYPE foo '-//I/Hate/External/IDs'>
# dt = DocType.new( doctype_to_clone )
# # Incomplete. Shallow clone of doctype
#
# +Note+ that the constructor:
#
# Doctype.new( Source.new( "<!DOCTYPE foo 'bar'>" ) )
#
# is _deprecated_. Do not use it. It will probably disappear.
def initialize( first, parent=nil )
@entities = DEFAULT_ENTITIES
@long_name = @uri = nil
if first.kind_of? String
super()
@name = first
@external_id = parent
elsif first.kind_of? DocType
super( parent )
@name = first.name
@external_id = first.external_id
elsif first.kind_of? Array
super( parent )
@name = first[0]
@external_id = first[1]
@long_name = first[2]
@uri = first[3]
elsif first.kind_of? Source
super( parent )
parser = Parsers::BaseParser.new( first )
event = parser.pull
if event[0] == :start_doctype
@name, @external_id, @long_name, @uri, = event[1..-1]
end
else
super()
end
end
def node_type
:doctype
end
def attributes_of element
rv = []
each do |child|
child.each do |key,val|
rv << Attribute.new(key,val)
end if child.kind_of? AttlistDecl and child.element_name == element
end
rv
end
def attribute_of element, attribute
att_decl = find do |child|
child.kind_of? AttlistDecl and
child.element_name == element and
child.include? attribute
end
return nil unless att_decl
att_decl[attribute]
end
def clone
DocType.new self
end
# output::
# Where to write the string
# indent::
# An integer. If -1, no indentation will be used; otherwise, the
# indentation will be this number of spaces, and children will be
# indented an additional amount.
# transitive::
# Ignored
# ie_hack::
# Ignored
def write( output, indent=0, transitive=false, ie_hack=false )
f = REXML::Formatters::Default.new
indent( output, indent )
output << START
output << ' '
output << @name
output << " #@external_id" if @external_id
output << " #{@long_name.inspect}" if @long_name
output << " #{@uri.inspect}" if @uri
unless @children.empty?
output << ' ['
@children.each { |child|
output << "\n"
f.write( child, output )
}
output << "\n]"
end
output << STOP
end
def context
@parent.context
end
def entity( name )
@entities[name].unnormalized if @entities[name]
end
def add child
super(child)
@entities = DEFAULT_ENTITIES.clone if @entities == DEFAULT_ENTITIES
@entities[ child.name ] = child if child.kind_of? Entity
end
# This method retrieves the public identifier identifying the document's
# DTD.
#
# Method contributed by Henrik Martensson
def public
case @external_id
when "SYSTEM"
nil
when "PUBLIC"
strip_quotes(@long_name)
end
end
# This method retrieves the system identifier identifying the document's DTD
#
# Method contributed by Henrik Martensson
def system
case @external_id
when "SYSTEM"
strip_quotes(@long_name)
when "PUBLIC"
@uri.kind_of?(String) ? strip_quotes(@uri) : nil
end
end
# This method returns a list of notations that have been declared in the
# _internal_ DTD subset. Notations in the external DTD subset are not
# listed.
#
# Method contributed by Henrik Martensson
def notations
children().select {|node| node.kind_of?(REXML::NotationDecl)}
end
# Retrieves a named notation. Only notations declared in the internal
# DTD subset can be retrieved.
#
# Method contributed by Henrik Martensson
def notation(name)
notations.find { |notation_decl|
notation_decl.name == name
}
end
private
# Method contributed by Henrik Martensson
def strip_quotes(quoted_string)
quoted_string =~ /^[\'\"].*[\'\"]$/ ?
quoted_string[1, quoted_string.length-2] :
quoted_string
end
end
# We don't really handle any of these since we're not a validating
# parser, so we can be pretty dumb about them. All we need to be able
# to do is spew them back out on a write()
# This is an abstract class. You never use this directly; it serves as a
# parent class for the specific declarations.
class Declaration < Child
def initialize src
super()
@string = src
end
def to_s
@string+'>'
end
# == DEPRECATED
# See REXML::Formatters
#
def write( output, indent )
output << to_s
end
end
public
class ElementDecl < Declaration
def initialize( src )
super
end
end
class ExternalEntity < Child
def initialize( src )
super()
@entity = src
end
def to_s
@entity
end
def write( output, indent )
output << @entity
end
end
class NotationDecl < Child
attr_accessor :public, :system
def initialize name, middle, pub, sys
super(nil)
@name = name
@middle = middle
@public = pub
@system = sys
end
def to_s
notation = "<!NOTATION #{@name} #{@middle}"
notation << " #{@public.inspect}" if @public
notation << " #{@system.inspect}" if @system
notation << ">"
notation
end
def write( output, indent=-1 )
output << to_s
end
# This method retrieves the name of the notation.
#
# Method contributed by Henrik Martensson
def name
@name
end
end
end