Class: REXML::Parsers::TreeParser

Inherits:
Object
  • Object
show all
Defined in:
lib/rexml/parsers/treeparser.rb

Instance Method Summary collapse

Constructor Details

#initialize(source, build_context = Document.new) ⇒ TreeParser

Returns a new instance of TreeParser.



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# File 'lib/rexml/parsers/treeparser.rb', line 8

def initialize( source, build_context = Document.new )
  @build_context = build_context
  @parser = Parsers::BaseParser.new( source )
end

Instance Method Details

#add_listener(listener) ⇒ Object 



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# File 'lib/rexml/parsers/treeparser.rb', line 13

def add_listener( listener )
  @parser.add_listener( listener )
end

#parse ⇒ Object 



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# File 'lib/rexml/parsers/treeparser.rb', line 17

def parse
  tag_stack = []
  in_doctype = false
  entities = nil
  begin
    while true
      event = @parser.pull
      #STDERR.puts "TREEPARSER GOT #{event.inspect}"
      case event[0]
      when :end_document
        unless tag_stack.empty?
          raise ParseException.new("No close tag for #{@build_context.xpath}",
                                   @parser.source, @parser)
        end
        return
      when :start_element
        tag_stack.push(event[1])
        el = @build_context = @build_context.add_element( event[1] )
        event[2].each do |key, value|
          el.attributes[key]=Attribute.new(key,value,self)
        end
      when :end_element
        tag_stack.pop
        @build_context = @build_context.parent
      when :text
        if not in_doctype
          if @build_context[-1].instance_of? Text
            @build_context[-1] << event[1]
          else
            @build_context.add(
              Text.new(event[1], @build_context.whitespace, nil, true)
            ) unless (
              @build_context.ignore_whitespace_nodes and
              event[1].strip.size==0
            )
          end
        end
      when :comment
        c = Comment.new( event[1] )
        @build_context.add( c )
      when :cdata
        c = CData.new( event[1] )
        @build_context.add( c )
      when :processing_instruction
        @build_context.add( Instruction.new( event[1], event[2] ) )
      when :end_doctype
        in_doctype = false
        entities.each { |k,v| entities[k] = @build_context.entities[k].value }
        @build_context = @build_context.parent
      when :start_doctype
        doctype = DocType.new( event[1..-1], @build_context )
        @build_context = doctype
        entities = {}
        in_doctype = true
      when :attlistdecl
        n = AttlistDecl.new( event[1..-1] )
        @build_context.add( n )
      when :externalentity
        n = ExternalEntity.new( event[1] )
        @build_context.add( n )
      when :elementdecl
        n = ElementDecl.new( event[1] )
        @build_context.add(n)
      when :entitydecl
        entities[ event[1] ] = event[2] unless event[2] =~ /PUBLIC|SYSTEM/
        @build_context.add(Entity.new(event))
      when :notationdecl
        n = NotationDecl.new( *event[1..-1] )
        @build_context.add( n )
      when :xmldecl
        x = XMLDecl.new( event[1], event[2], event[3] )
        @build_context.add( x )
      end
    end
  rescue REXML::Validation::ValidationException
    raise
  rescue REXML::ParseException
    raise
  rescue
    raise ParseException.new( $!.message, @parser.source, @parser, $! )
  end
end