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Diffstat (limited to 'ruby_1_8_5/lib/rexml/document.rb')
| -rw-r--r-- | ruby_1_8_5/lib/rexml/document.rb | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/ruby_1_8_5/lib/rexml/document.rb b/ruby_1_8_5/lib/rexml/document.rb new file mode 100644 index 0000000000..619a844257 --- /dev/null +++ b/ruby_1_8_5/lib/rexml/document.rb @@ -0,0 +1,193 @@ +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. + # NOTE that I'm not sure what the context is for; I cloned it out of + # the Electric XML API (in which it also seems to do nothing), and it + # is now legacy. It may do something, someday... it may disappear. + def initialize( source = nil, context = {} ) + 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 + @children.unshift child + 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 = 0 + @children.find { |x| + insert_before_index += 1 + x.kind_of?(Element) || x.kind_of?(DocType) + } + if @children[ insert_before_index ] # Not null = not end of list + if @children[ insert_before_index ].kind_of DocType + @children[ insert_before_index ] = child + else + @children[ index_before_index-1, 0 ] = child + end + else # Insert at end of list + @children[insert_before_index] = 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 a String. + # 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 + + # 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 unneccessary bandwidth to applications such + # as XML-RPC. + # + # + # 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 this number of spaces, and children will be + # indented an additional amount. 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 + def write( output=$stdout, indent=-1, transitive=false, ie_hack=false ) + output = Output.new( output, xml_decl.encoding ) if xml_decl.encoding != "UTF-8" && !output.kind_of?(Output) + @children.each { |node| + indent( output, indent ) if node.node_type == :element + if node.write( output, indent, transitive, ie_hack ) + output << "\n" unless indent<0 or node == @children[-1] + end + } + end + + + def Document::parse_stream( source, listener ) + Parsers::StreamParser.new( source, listener ).parse + end + + private + def build( source ) + Parsers::TreeParser.new( source, self ).parse + end + end +end |