class IO

Public Class Methods

binread(file, length = nil, offset = 0) click to toggle source
# File lib/backports/1.9.1/io/binread.rb, line 4
def IO.binread(file, length = nil, offset = 0)
  File.open(Backports.convert_path(file),"rb") do |f|
    f.seek(offset)
    f.read(length)
  end
end
binwrite(name, string, offset = nil, options = Backports::Undefined) click to toggle source
# File lib/backports/1.9.3/io/binwrite.rb, line 4
def IO.binwrite(name, string, offset = nil, options = Backports::Undefined)
  Backports.write(true, name, string, offset, options)
end
open_with_options_hash(*args) { |f| ... } click to toggle source
# File lib/backports/1.9.1/io/open.rb, line 9
def open_with_options_hash(*args)
  if args.size > 2 || args[1].respond_to?(:to_hash)
    fd, mode, options = (args << Backports::Undefined)
    args = [fd, Backports.combine_mode_and_option(mode, options)]
  end
  if block_given?
    open_without_options_hash(*args){|f| yield f}
  else
    open_without_options_hash(*args)
  end
end
try_convert(obj) click to toggle source
# File lib/backports/1.9.1/io/try_convert.rb, line 4
def IO.try_convert(obj)
  Backports.try_convert(obj, IO, :to_io)
end
write(name, string, offset = nil, options = Backports::Undefined) click to toggle source
# File lib/backports/1.9.3/io/write.rb, line 4
def IO.write(name, string, offset = nil, options = Backports::Undefined)
  Backports.write(false, name, string, offset, options)
end

Public Instance Methods

advise(advice, offset=0, len=0) click to toggle source
# File lib/backports/1.9.3/io/advise.rb, line 5
def advise(advice, offset=0, len=0)
  raise RangeError if Backports.coerce_to_int(offset) >= 1<<31
  raise RangeError if Backports.coerce_to_int(len) >= 1<<31
  raise IOError if closed?
  case advice
  when  :normal,
        :sequential,
        :random,
        :willneed,
        :dontneed,
        :noreuse
    return nil
  when Symbol
    raise NotImplementedError, "Unsupported advice #{advice}"
  else
    raise TypeError, "advice must be a Symbol"
  end
end
chars()
Alias for: each_char
each_char() { |c| ... } click to toggle source
# File lib/backports/1.8.7/io/each_char.rb, line 5
def each_char
  return to_enum(:each_char) unless block_given?
  if $KCODE == "UTF-8"
    lookup = 7.downto(4)
    while c = read(1) do
      n = c[0]
      leftmost_zero_bit = lookup.find{|i| n[i].zero? }
      case leftmost_zero_bit
      when 7 # ASCII
        yield c
      when 6 # UTF 8 complementary characters
        next # Encoding error, ignore
      else
        more = read(6-leftmost_zero_bit)
        break unless more
        yield c+more
      end
    end
  else
    while s = read(1)
      yield s
    end
  end

  self
end
Also aliased as: chars