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| Current File : //usr/share/ruby/rexml/document.rb |
require "rexml/element"
require "rexml/xmldecl"
require "rexml/source"
require "rexml/comment"
require "rexml/doctype"
require "rexml/instruction"
require "rexml/rexml"
require "rexml/parseexception"
require "rexml/output"
require "rexml/parsers/baseparser"
require "rexml/parsers/streamparser"
require "rexml/parsers/treeparser"
module REXML
# Represents a full XML document, including PIs, a doctype, etc. A
# Document has a single child that can be accessed by root().
# Note that if you want to have an XML declaration written for a document
# you create, you must add one; REXML documents do not write a default
# declaration for you. See |DECLARATION| and |write|.
class Document < Element
# A convenient default XML declaration. If you want an XML declaration,
# the easiest way to add one is mydoc << Document::DECLARATION
# +DEPRECATED+
# Use: mydoc << XMLDecl.default
DECLARATION = XMLDecl.default
# Constructor
# @param source if supplied, must be a Document, String, or IO.
# Documents have their context and Element attributes cloned.
# Strings are expected to be valid XML documents. IOs are expected
# to be sources of valid XML documents.
# @param context if supplied, contains the context of the document;
# this should be a Hash.
def initialize( source = nil, context = {} )
@entity_expansion_count = 0
super()
@context = context
return if source.nil?
if source.kind_of? Document
@context = source.context
super source
else
build( source )
end
end
def node_type
:document
end
# Should be obvious
def clone
Document.new self
end
# According to the XML spec, a root node has no expanded name
def expanded_name
''
#d = doc_type
#d ? d.name : "UNDEFINED"
end
alias :name :expanded_name
# We override this, because XMLDecls and DocTypes must go at the start
# of the document
def add( child )
if child.kind_of? XMLDecl
if @children[0].kind_of? XMLDecl
@children[0] = child
else
@children.unshift child
end
child.parent = self
elsif child.kind_of? DocType
# Find first Element or DocType node and insert the decl right
# before it. If there is no such node, just insert the child at the
# end. If there is a child and it is an DocType, then replace it.
insert_before_index = @children.find_index { |x|
x.kind_of?(Element) || x.kind_of?(DocType)
}
if insert_before_index # Not null = not end of list
if @children[ insert_before_index ].kind_of? DocType
@children[ insert_before_index ] = child
else
@children[ insert_before_index-1, 0 ] = child
end
else # Insert at end of list
@children << child
end
child.parent = self
else
rv = super
raise "attempted adding second root element to document" if @elements.size > 1
rv
end
end
alias :<< :add
def add_element(arg=nil, arg2=nil)
rv = super
raise "attempted adding second root element to document" if @elements.size > 1
rv
end
# @return the root Element of the document, or nil if this document
# has no children.
def root
elements[1]
#self
#@children.find { |item| item.kind_of? Element }
end
# @return the DocType child of the document, if one exists,
# and nil otherwise.
def doctype
@children.find { |item| item.kind_of? DocType }
end
# @return the XMLDecl of this document; if no XMLDecl has been
# set, the default declaration is returned.
def xml_decl
rv = @children[0]
return rv if rv.kind_of? XMLDecl
rv = @children.unshift(XMLDecl.default)[0]
end
# @return the XMLDecl version of this document as a String.
# If no XMLDecl has been set, returns the default version.
def version
xml_decl().version
end
# @return the XMLDecl encoding of this document as an
# Encoding object.
# If no XMLDecl has been set, returns the default encoding.
def encoding
xml_decl().encoding
end
# @return the XMLDecl standalone value of this document as a String.
# If no XMLDecl has been set, returns the default setting.
def stand_alone?
xml_decl().stand_alone?
end
# :call-seq:
# doc.write(output=$stdout, indent=-1, transtive=false, ie_hack=false, encoding=nil)
# doc.write(options={:output => $stdout, :indent => -1, :transtive => false, :ie_hack => false, :encoding => nil})
#
# Write the XML tree out, optionally with indent. This writes out the
# entire XML document, including XML declarations, doctype declarations,
# and processing instructions (if any are given).
#
# A controversial point is whether Document should always write the XML
# declaration (<?xml version='1.0'?>) whether or not one is given by the
# user (or source document). REXML does not write one if one was not
# specified, because it adds unnecessary bandwidth to applications such
# as XML-RPC.
#
# Accept Nth argument style and options Hash style as argument.
# The recommended style is options Hash style for one or more
# arguments case.
#
# _Examples_
# Document.new("<a><b/></a>").write
#
# output = ""
# Document.new("<a><b/></a>").write(output)
#
# output = ""
# Document.new("<a><b/></a>").write(:output => output, :indent => 2)
#
# See also the classes in the rexml/formatters package for the proper way
# to change the default formatting of XML output.
#
# _Examples_
#
# output = ""
# tr = Transitive.new
# tr.write(Document.new("<a><b/></a>"), output)
#
# output::
# output an object which supports '<< string'; this is where the
# document will be written.
# indent::
# An integer. If -1, no indenting will be used; otherwise, the
# indentation will be twice this number of spaces, and children will be
# indented an additional amount. For a value of 3, every item will be
# indented 3 more levels, or 6 more spaces (2 * 3). Defaults to -1
# 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. Defaults to false
# encoding::
# Encoding name as String. Change output encoding to specified encoding
# instead of encoding in XML declaration.
# Defaults to nil. It means encoding in XML declaration is used.
def write(*arguments)
if arguments.size == 1 and arguments[0].class == Hash
options = arguments[0]
output = options[:output]
indent = options[:indent]
transitive = options[:transitive]
ie_hack = options[:ie_hack]
encoding = options[:encoding]
else
output, indent, transitive, ie_hack, encoding, = *arguments
end
output ||= $stdout
indent ||= -1
transitive = false if transitive.nil?
ie_hack = false if ie_hack.nil?
encoding ||= xml_decl.encoding
if encoding != 'UTF-8' && !output.kind_of?(Output)
output = Output.new( output, encoding )
end
formatter = if indent > -1
if transitive
require "rexml/formatters/transitive"
REXML::Formatters::Transitive.new( indent, ie_hack )
else
REXML::Formatters::Pretty.new( indent, ie_hack )
end
else
REXML::Formatters::Default.new( ie_hack )
end
formatter.write( self, output )
end
def Document::parse_stream( source, listener )
Parsers::StreamParser.new( source, listener ).parse
end
@@entity_expansion_limit = 10_000
# Set the entity expansion limit. By default the limit is set to 10000.
def Document::entity_expansion_limit=( val )
@@entity_expansion_limit = val
end
# Get the entity expansion limit. By default the limit is set to 10000.
def Document::entity_expansion_limit
return @@entity_expansion_limit
end
# Set the entity expansion limit. By default the limit is set to 10240.
#
# Deprecated. Use REXML.entity_expansion_text_limit= instead.
def Document::entity_expansion_text_limit=( val )
REXML.entity_expansion_text_limit = val
end
# Get the entity expansion limit. By default the limit is set to 10240.
#
# Deprecated. Use REXML.entity_expansion_text_limit instead.
def Document::entity_expansion_text_limit
return REXML.entity_expansion_text_limit
end
attr_reader :entity_expansion_count
def record_entity_expansion
@entity_expansion_count += 1
if @entity_expansion_count > @@entity_expansion_limit
raise "number of entity expansions exceeded, processing aborted."
end
end
def document
self
end
private
def build( source )
Parsers::TreeParser.new( source, self ).parse
end
end
end