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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 indenting will be used; otherwise, the
# indentation will be this number of spaces, and children will be
# indented an additional amount.
# transitive::
# If transitive is true and indent is >= 0, then the output will be
# pretty-printed in such a way that the added whitespace does not affect
# the absolute *value* of the document -- that is, it leaves the value
# and number of Text nodes in the document unchanged.
# ie_hack::
# Internet Explorer is the worst piece of crap to have ever been
# written, with the possible exception of Windows itself. Since IE is
# unable to parse proper XML, we have to provide a hack to generate XML
# that IE's limited abilities can handle. This hack inserts a space
# before the /> on empty tags.
#
def write( output, indent=0, transitive=false, ie_hack=false )
indent( output, indent )
output << START
output << ' '
output << @name
output << " #@external_id" if @external_id
output << " #@long_name" if @long_name
output << " #@uri" if @uri
unless @children.empty?
next_indent = indent + 1
output << ' ['
child = nil # speed
@children.each { |child|
output << "\n"
child.write( output, next_indent )
}
output << "\n"
#output << ' '*next_indent
output << "]"
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
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
def write( output, indent )
output << (' '*indent) if indent > 0
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
output << "\n"
end
end
class NotationDecl < Child
def initialize name, middle, rest
@name = name
@middle = middle
@rest = rest
end
def to_s
"<!NOTATION #@name '#@middle #@rest'>"
end
def write( output, indent=-1 )
output << (' '*indent) if indent > 0
output << to_s
end
end
end
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