Class: REXML::Document

Inherits:
Element show all
Defined in:
lib/rexml/document.rb

Overview

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|.

Constant Summary collapse

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 << XMLDecl.default

XMLDecl.default
@@entity_expansion_limit =
10_000
@@entity_expansion_text_limit =
10_240

Constants inherited from Element

Element::UNDEFINED

Constants included from Namespace

Namespace::NAMESPLIT

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 Element

#attributes, #context, #elements

Attributes included from Namespace

#prefix

Attributes inherited from Child

#parent

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Element

#add_attribute, #add_attributes, #add_namespace, #add_text, #attribute, #cdatas, #comments, #delete_attribute, #delete_element, #delete_namespace, #document, #each_element, #each_element_with_attribute, #each_element_with_text, #get_elements, #get_text, #has_attributes?, #has_elements?, #has_text?, #ignore_whitespace_nodes, #inspect, #instructions, #namespace, #namespaces, #next_element, #prefixes, #previous_element, #raw, #root_node, #text, #text=, #texts, #whitespace, #xpath

Methods included from Namespace

#fully_expanded_name, #has_name?

Methods inherited from Parent

#[], #[]=, #deep_clone, #delete, #delete_at, #delete_if, #each, #each_index, #index, #insert_after, #insert_before, #parent?, #replace_child, #size, #to_a, #unshift

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, #to_s

Constructor Details

#initialize(source = nil, context = {}) ⇒ Document

Constructor 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. this should be a Hash.

Parameters:

  • source (defaults to: nil)

    if supplied, must be a Document, String, or IO.

  • context (defaults to: {})

    if supplied, contains the context of the document;


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# File 'lib/rexml/document.rb', line 34

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

Instance Attribute Details

#entity_expansion_countObject (readonly)

Returns the value of attribute entity_expansion_count


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# File 'lib/rexml/document.rb', line 270

def entity_expansion_count
  @entity_expansion_count
end

Class Method Details

.entity_expansion_limitObject

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


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# File 'lib/rexml/document.rb', line 254

def Document::entity_expansion_limit
  return @@entity_expansion_limit
end

.entity_expansion_limit=(val) ⇒ Object

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


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# File 'lib/rexml/document.rb', line 249

def Document::entity_expansion_limit=( val )
  @@entity_expansion_limit = val
end

.entity_expansion_text_limitObject

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


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# File 'lib/rexml/document.rb', line 266

def Document::entity_expansion_text_limit
  return @@entity_expansion_text_limit
end

.entity_expansion_text_limit=(val) ⇒ Object

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


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# File 'lib/rexml/document.rb', line 261

def Document::entity_expansion_text_limit=( val )
  @@entity_expansion_text_limit = val
end

.parse_stream(source, listener) ⇒ Object


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# File 'lib/rexml/document.rb', line 242

def Document::parse_stream( source, listener )
  Parsers::StreamParser.new( source, listener ).parse
end

Instance Method Details

#add(child) ⇒ Object Also known as: <<

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


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# File 'lib/rexml/document.rb', line 67

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

#add_element(arg = nil, arg2 = nil) ⇒ Object


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# File 'lib/rexml/document.rb', line 100

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

#cloneObject

Should be obvious


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# File 'lib/rexml/document.rb', line 52

def clone
  Document.new self
end

#doctypeObject

and nil otherwise.

Returns:

  • the DocType child of the document, if one exists,


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# File 'lib/rexml/document.rb', line 116

def doctype
  @children.find { |item| item.kind_of? DocType }
end

#encodingObject

Encoding object. If no XMLDecl has been set, returns the default encoding.

Returns:

  • the XMLDecl encoding of this document as an


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# File 'lib/rexml/document.rb', line 137

def encoding
  xml_decl().encoding
end

#expanded_nameObject Also known as: name

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


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# File 'lib/rexml/document.rb', line 57

def expanded_name
  ''
  #d = doc_type
  #d ? d.name : "UNDEFINED"
end

#node_typeObject


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# File 'lib/rexml/document.rb', line 47

def node_type
  :document
end

#record_entity_expansionObject


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# File 'lib/rexml/document.rb', line 272

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

#rootObject

has no children.

Returns:

  • the root Element of the document, or nil if this document


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# File 'lib/rexml/document.rb', line 108

def root
  elements[1]
  #self
  #@children.find { |item| item.kind_of? Element }
end

#stand_alone?Boolean

If no XMLDecl has been set, returns the default setting.

Returns:

  • (Boolean)

    the XMLDecl standalone value of this document as a String.


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# File 'lib/rexml/document.rb', line 143

def stand_alone?
  xml_decl().stand_alone?
end

#versionObject

If no XMLDecl has been set, returns the default version.

Returns:

  • the XMLDecl version of this document as a String.


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# File 'lib/rexml/document.rb', line 130

def version
  xml_decl().version
end

#write(*arguments) ⇒ Object

: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.


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# File 'lib/rexml/document.rb', line 206

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_declObject

set, the default declaration is returned.

Returns:

  • the XMLDecl of this document; if no XMLDecl has been


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# File 'lib/rexml/document.rb', line 122

def xml_decl
  rv = @children[0]
  return rv if rv.kind_of? XMLDecl
  rv = @children.unshift(XMLDecl.default)[0]
end