210 lines
6.7 KiB
Ruby
210 lines
6.7 KiB
Ruby
require "rexml/element"
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require "rexml/xmldecl"
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require "rexml/source"
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require "rexml/comment"
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require "rexml/doctype"
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require "rexml/instruction"
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require "rexml/rexml"
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require "rexml/parseexception"
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require "rexml/output"
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require "rexml/parsers/baseparser"
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require "rexml/parsers/streamparser"
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require "rexml/parsers/treeparser"
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require "rexml/formatters/transitive"
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module REXML
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# Represents a full XML document, including PIs, a doctype, etc. A
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# Document has a single child that can be accessed by root().
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# Note that if you want to have an XML declaration written for a document
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# you create, you must add one; REXML documents do not write a default
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# declaration for you. See |DECLARATION| and |write|.
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class Document < Element
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# A convenient default XML declaration. If you want an XML declaration,
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# the easiest way to add one is mydoc << Document::DECLARATION
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# +DEPRECATED+
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# Use: mydoc << XMLDecl.default
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DECLARATION = XMLDecl.default
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# Constructor
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# @param source if supplied, must be a Document, String, or IO.
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# Documents have their context and Element attributes cloned.
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# Strings are expected to be valid XML documents. IOs are expected
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# to be sources of valid XML documents.
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# @param context if supplied, contains the context of the document;
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# this should be a Hash.
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def initialize( source = nil, context = {} )
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super()
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@context = context
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return if source.nil?
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if source.kind_of? Document
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@context = source.context
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super source
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else
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build( source )
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end
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end
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def node_type
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:document
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end
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# Should be obvious
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def clone
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Document.new self
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end
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# According to the XML spec, a root node has no expanded name
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def expanded_name
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''
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#d = doc_type
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#d ? d.name : "UNDEFINED"
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end
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alias :name :expanded_name
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# We override this, because XMLDecls and DocTypes must go at the start
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# of the document
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def add( child )
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if child.kind_of? XMLDecl
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@children.unshift child
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child.parent = self
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elsif child.kind_of? DocType
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# Find first Element or DocType node and insert the decl right
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# before it. If there is no such node, just insert the child at the
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# end. If there is a child and it is an DocType, then replace it.
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insert_before_index = 0
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@children.find { |x|
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insert_before_index += 1
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x.kind_of?(Element) || x.kind_of?(DocType)
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}
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if @children[ insert_before_index ] # Not null = not end of list
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if @children[ insert_before_index ].kind_of DocType
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@children[ insert_before_index ] = child
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else
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@children[ index_before_index-1, 0 ] = child
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end
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else # Insert at end of list
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@children[insert_before_index] = child
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end
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child.parent = self
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else
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rv = super
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raise "attempted adding second root element to document" if @elements.size > 1
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rv
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end
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end
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alias :<< :add
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def add_element(arg=nil, arg2=nil)
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rv = super
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raise "attempted adding second root element to document" if @elements.size > 1
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rv
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end
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# @return the root Element of the document, or nil if this document
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# has no children.
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def root
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elements[1]
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#self
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#@children.find { |item| item.kind_of? Element }
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end
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# @return the DocType child of the document, if one exists,
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# and nil otherwise.
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def doctype
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@children.find { |item| item.kind_of? DocType }
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end
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# @return the XMLDecl of this document; if no XMLDecl has been
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# set, the default declaration is returned.
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def xml_decl
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rv = @children[0]
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return rv if rv.kind_of? XMLDecl
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rv = @children.unshift(XMLDecl.default)[0]
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end
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# @return the XMLDecl version of this document as a String.
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# If no XMLDecl has been set, returns the default version.
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def version
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xml_decl().version
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end
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# @return the XMLDecl encoding of this document as a String.
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# If no XMLDecl has been set, returns the default encoding.
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def encoding
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xml_decl().encoding
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end
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# @return the XMLDecl standalone value of this document as a String.
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# If no XMLDecl has been set, returns the default setting.
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def stand_alone?
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xml_decl().stand_alone?
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end
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# Write the XML tree out, optionally with indent. This writes out the
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# entire XML document, including XML declarations, doctype declarations,
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# and processing instructions (if any are given).
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#
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# A controversial point is whether Document should always write the XML
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# declaration (<?xml version='1.0'?>) whether or not one is given by the
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# user (or source document). REXML does not write one if one was not
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# specified, because it adds unneccessary bandwidth to applications such
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# as XML-RPC.
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#
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# See also the classes in the rexml/formatters package for the proper way
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# to change the default formatting of XML output
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#
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# _Examples_
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# Document.new("<a><b/></a>").serialize
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#
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# output_string = ""
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# tr = Transitive.new( output_string )
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# Document.new("<a><b/></a>").serialize( tr )
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#
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# output::
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# output an object which supports '<< string'; this is where the
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# document will be written.
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# indent::
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# An integer. If -1, no indenting will be used; otherwise, the
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# indentation will be twice this number of spaces, and children will be
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# indented an additional amount. For a value of 3, every item will be
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# indented 3 more levels, or 6 more spaces (2 * 3). Defaults to -1
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# trans::
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# If transitive is true and indent is >= 0, then the output will be
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# pretty-printed in such a way that the added whitespace does not affect
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# the absolute *value* of the document -- that is, it leaves the value
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# and number of Text nodes in the document unchanged.
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# ie_hack::
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# Internet Explorer is the worst piece of crap to have ever been
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# written, with the possible exception of Windows itself. Since IE is
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# unable to parse proper XML, we have to provide a hack to generate XML
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# that IE's limited abilities can handle. This hack inserts a space
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# before the /> on empty tags. Defaults to false
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def write( output=$stdout, indent=-1, transitive=false, ie_hack=false )
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if xml_decl.encoding != "UTF-8" && !output.kind_of?(Output)
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output = Output.new( output, xml_decl.encoding )
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end
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formatter = if indent > -1
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if transitive
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REXML::Formatters::Transitive.new( indent, ie_hack )
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else
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REXML::Formatters::Pretty.new( indent, ie_hack )
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end
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else
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REXML::Formatters::Default.new( ie_hack )
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end
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formatter.write( self, output )
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end
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def Document::parse_stream( source, listener )
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Parsers::StreamParser.new( source, listener ).parse
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end
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private
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def build( source )
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Parsers::TreeParser.new( source, self ).parse
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end
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end
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end
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