Method: REXML::IOSource#initialize

Defined in:
lib/extensions/rexml/rexml/source.rb,
lib/extensions/rhoxml/rexml/source.rb

#initialize(arg, block_size = 500, encoding = nil) ⇒ IOSource

block_size has been deprecated



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# File 'lib/extensions/rexml/rexml/source.rb', line 138

def initialize(arg, block_size=500, encoding=nil)
  @er_source = @source = arg
  @to_utf = false

  # Determining the encoding is a deceptively difficult issue to resolve.
  # First, we check the first two bytes for UTF-16.  Then we
  # assume that the encoding is at least ASCII enough for the '>', and
  # we read until we get one of those.  This gives us the XML declaration,
  # if there is one.  If there isn't one, the file MUST be UTF-8, as per
  # the XML spec.  If there is one, we can determine the encoding from
  # it.
  @buffer = ""
  str = @source.read( 2 ) || ''
  if encoding
    self.encoding = encoding
  elsif str[0,2] == "\xfe\xff"
    @line_break = "\000>"
  elsif str[0,2] == "\xff\xfe"
    @line_break = ">\000"
  elsif str[0,2] == "\xef\xbb"
    str += @source.read(1)
    str = '' if (str[2,1] == "\xBF")
    @line_break = ">"
  else
    @line_break = ">"
  end
  super( @source.eof? ? str : str+@source.readline( @line_break ) )

  if !@to_utf and
      @buffer.respond_to?(:force_encoding) and
      @source.respond_to?(:external_encoding) and
      @source.external_encoding != "UTF-8" #::Encoding::UTF_8
    @force_utf8 = true
  else
    @force_utf8 = false
  end
end