Class: IO

Inherits:
Object
  • Object
show all
Defined in:
mrbgems/mruby-io/mrblib/io.rb

Direct Known Subclasses

BasicSocket, File

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.open(*args, &block) ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 10

def self.open(*args, &block)
  io = self.new(*args)

  return io unless block

  begin
    yield io
  ensure
    begin
      io.close unless io.closed?
    rescue StandardError
    end
  end
end

.pipe(&block) ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 43

def self.pipe(&block)
  if !self.respond_to?(:_pipe)
    raise NotImplementedError, "pipe is not supported on this platform"
  end
  if block
    begin
      r, w = IO._pipe
      yield r, w
    ensure
      r.close unless r.closed?
      w.close unless w.closed?
    end
  else
    IO._pipe
  end
end

.popen(command, mode = 'r', **opts, &block) ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 25

def self.popen(command, mode = 'r', **opts, &block)
  if !self.respond_to?(:_popen)
    raise NotImplementedError, "popen is not supported on this platform"
  end
  io = self._popen(command, mode, **opts)
  return io unless block

  begin
    yield io
  ensure
    begin
      io.close unless io.closed?
    rescue IOError
      # nothing
    end
  end
end

.read(path, length = nil, offset = 0, mode: "r") ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 60

def self.read(path, length=nil, offset=0, mode: "r")
  str = ""
  fd = -1
  io = nil
  begin
    fd = IO.sysopen(path, mode)
    io = IO.open(fd, mode)
    io.seek(offset) if offset > 0
    str = io.read(length)
  ensure
    if io
      io.close
    elsif fd != -1
      IO._sysclose(fd)
    end
  end
  str
end

Instance Method Details

#<<(str) ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 85

def <<(str)
  write(str)
  self
end

#each(&block) ⇒ Object Also known as: each_line

15.2.20.5.3



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 113

def each(&block)
  return to_enum unless block

  while line = self.gets
    block.call(line)
  end
  self
end

#each_byte(&block) ⇒ Object

15.2.20.5.4



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 123

def each_byte(&block)
  return to_enum(:each_byte) unless block

  while byte = self.getbyte
    block.call(byte)
  end
  self
end

#each_char(&block) ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 135

def each_char(&block)
  return to_enum(:each_char) unless block

  while char = self.getc
    block.call(char)
  end
  self
end

#hash ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 79

def hash
  # We must define IO#hash here because IO includes Enumerable and
  # Enumerable#hash will call IO#read() otherwise
  self.__id__
end

#pos=(i) ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 93

def pos=(i)
  seek(i, SEEK_SET)
end

#print(*args) ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 165

def print(*args)
  i = 0
  len = args.size
  while i < len
    write args[i].to_s
    i += 1
  end
end

#printf(*args) ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 174

def printf(*args)
  write sprintf(*args)
  nil
end

#puts(*args) ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 144

def puts(*args)
  i = 0
  len = args.size
  if len == 0
    write "\n"
    return
  end
  while i < len
    s = args[i]
    if s.kind_of?(Array)
      puts(*s) if s.size > 0
    else
      s = s.to_s
      write s
      write "\n" if (s[-1] != "\n")
    end
    i += 1
  end
  nil
end

#rewind ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 97

def rewind
  seek(0, SEEK_SET)
end

#ungetbyte(c) ⇒ Object 



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# File 'mrbgems/mruby-io/mrblib/io.rb', line 101

def ungetbyte(c)
  if c.is_a? String
    c = c.getbyte(0)
  else
    c &= 0xff
  end
  s = " "
  s.setbyte(0,c)
  ungetc s
end