class Nokogiri::XML::SAX::PushParser

def finish
  write '', true
end

def initialize(doc = XML::SAX::Document.new, file_name = nil, encoding = 'UTF-8')
  @document = doc
  @encoding = encoding
  @sax_parser = XML::SAX::Parser.new(doc)
  ## Create our push parser context
  initialize_native(@sax_parser, file_name)
end

def initialize_native(sax, filename) # :nodoc:
  filename = filename.to_s unless filename.nil?
  ctx_ptr = LibXML.xmlCreatePushParserCtxt(
    sax.cstruct, nil, nil, 0, filename
    )
  raise(RuntimeError, "Could not create a parser context") if ctx_ptr.null?
  self.cstruct = LibXML::XmlSaxPushParserContext.new(ctx_ptr) ;
  self
end

def native_write(chunk, last_chunk) # :nodoc:
  size = 0
  unless chunk.nil?
    chunk = chunk.to_s
    size = chunk.length
  end
  if LibXML.xmlParseChunk(cstruct, chunk, size, last_chunk ? 1 : 0) != 0
    if (cstruct[:options] & XML::ParseOptions::RECOVER) == 0
      error = LibXML.xmlCtxtGetLastError(cstruct)
      raise Nokogiri::XML::SyntaxError.wrap(error)
    end
  end
  self
end

def options
  cstruct[:options]
end

def options=(user_options)
  if LibXML.xmlCtxtUseOptions(cstruct, user_options) != 0
    raise RuntimeError, "Cannot set XML parser context options"
  end
  nil
end

def write chunk, last_chunk = false
  native_write(chunk, last_chunk)
end