Class: REXML::Document (Ruby 2.3.4)

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rexml/document.rb

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REXML::Document

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|.

Constants

DECLARATION: A convenient default XML declaration. If you want an XML declaration, the easiest way to add one is mydoc << Document::DECLARATION DEPRECATED Use: mydoc << REXML::XMLDecl.default

Attributes

entity_expansion_count[R]

Public Class Methods

entity_expansion_limit()

Get the entity expansion limit. By default the limit is set to 10000.

Deprecated. Use REXML::Security.entity_expansion_limit= instead.

 
               # File rexml/document.rb, line 255
def Document::entity_expansion_limit
  return Security.entity_expansion_limit
end

entity_expansion_limit=( val )

Set the entity expansion limit. By default the limit is set to 10000.

Deprecated. Use REXML::Security.entity_expansion_limit= instead.

 
               # File rexml/document.rb, line 248
def Document::entity_expansion_limit=( val )
  Security.entity_expansion_limit = val
end

entity_expansion_text_limit()

Get the entity expansion limit. By default the limit is set to 10240.

Deprecated. Use REXML::Security.entity_expansion_text_limit instead.

 
               # File rexml/document.rb, line 269
def Document::entity_expansion_text_limit
  return Security.entity_expansion_text_limit
end

entity_expansion_text_limit=( val )

Set the entity expansion limit. By default the limit is set to 10240.

Deprecated. Use REXML::Security.entity_expansion_text_limit= instead.

 
               # File rexml/document.rb, line 262
def Document::entity_expansion_text_limit=( val )
  Security.entity_expansion_text_limit = val
end

new( source = nil, context = {} )

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.

 
               # File rexml/document.rb, line 36
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

parse_stream( source, listener )

 
               # File rexml/document.rb, line 241
def Document::parse_stream( source, listener )
  Parsers::StreamParser.new( source, listener ).parse
end

Public Instance Methods

<<( child )

Alias for: add

add( child )

We override this, because XMLDecls and DocTypes must go at the start of the document

 
               # File rexml/document.rb, line 69
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

Also aliased as: <<

add_element(arg=nil, arg2=nil)

 
               # File rexml/document.rb, line 102
def add_element(arg=nil, arg2=nil)
  rv = super
  raise "attempted adding second root element to document" if @elements.size > 1
  rv
end

clone()

Should be obvious

 
               # File rexml/document.rb, line 54
def clone
  Document.new self
end

doctype()

@return the DocType child of the document, if one exists, and nil otherwise.

 
               # File rexml/document.rb, line 118
def doctype
  @children.find { |item| item.kind_of? DocType }
end

document()

 
               # File rexml/document.rb, line 282
def document
  self
end

encoding()

@return the XMLDecl encoding of this document as an Encoding object. If no XMLDecl has been set, returns the default encoding.

 
               # File rexml/document.rb, line 139
def encoding
  xml_decl().encoding
end

expanded_name()

According to the XML spec, a root node has no expanded name

 
               # File rexml/document.rb, line 59
def expanded_name
  ''
  #d = doc_type
  #d ? d.name : "UNDEFINED"
end

Also aliased as: name

name()

Alias for: expanded_name

node_type()

 
               # File rexml/document.rb, line 49
def node_type
  :document
end

record_entity_expansion()

 
               # File rexml/document.rb, line 275
def record_entity_expansion
  @entity_expansion_count += 1
  if @entity_expansion_count > Security.entity_expansion_limit
    raise "number of entity expansions exceeded, processing aborted."
  end
end

root()

@return the root Element of the document, or nil if this document has no children.

 
               # File rexml/document.rb, line 110
def root
  elements[1]
  #self
  #@children.find { |item| item.kind_of? Element }
end

stand_alone?()

@return the XMLDecl standalone value of this document as a String. If no XMLDecl has been set, returns the default setting.

 
               # File rexml/document.rb, line 145
def stand_alone?
  xml_decl().stand_alone?
end

version()

@return the XMLDecl version of this document as a String. If no XMLDecl has been set, returns the default version.

 
               # File rexml/document.rb, line 132
def version
  xml_decl().version
end

write(output=$stdout, indent=-1, transtive=false, ie_hack=false, encoding=nil)

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: This hack inserts a space before the /> on empty tags to address a limitation of Internet Explorer. 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.

 
               # File rexml/document.rb, line 205
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

xml_decl()

@return the XMLDecl of this document; if no XMLDecl has been set, the default declaration is returned.

 
               # File rexml/document.rb, line 124
def xml_decl
  rv = @children[0]
  return rv if rv.kind_of? XMLDecl
  @children.unshift(XMLDecl.default)[0]
end