Class: IO

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

Direct Known Subclasses

BasicSocket, File

Constant Summary collapse

SEEK_SET = 
0
SEEK_CUR = 
1
SEEK_END = 
2
BUF_SIZE = 
4096

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.open(*args, &block) ⇒ Object 



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# File 'ext/enterprise_script_service/mruby/mrbgems/mruby-io/mrblib/io.rb', line 14

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 'ext/enterprise_script_service/mruby/mrbgems/mruby-io/mrblib/io.rb', line 47

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 'ext/enterprise_script_service/mruby/mrbgems/mruby-io/mrblib/io.rb', line 29

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 = nil, opt = nil) ⇒ Object 



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# File 'ext/enterprise_script_service/mruby/mrbgems/mruby-io/mrblib/io.rb', line 64

def self.read(path, length=nil, offset=nil, opt=nil)
  if not opt.nil?        # 4 arguments
    offset ||= 0
  elsif not offset.nil?  # 3 arguments
    if offset.is_a? Hash
      opt = offset
      offset = 0
    else
      opt = {}
    end
  elsif not length.nil?  # 2 arguments
    if length.is_a? Hash
      opt = length
      offset = 0
      length = nil
    else
      offset = 0
      opt = {}
    end
  else                   # only 1 argument
    opt = {}
    offset = 0
    length = nil
  end

  str = ""
  fd = -1
  io = nil
  begin
    if path[0] == "|"
      io = IO.popen(path[1..-1], (opt[:mode] || "r"))
    else
      mode = opt[:mode] || "r"
      fd = IO.sysopen(path, mode)
      io = IO.open(fd, mode)
    end
    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 'ext/enterprise_script_service/mruby/mrbgems/mruby-io/mrblib/io.rb', line 135

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

#_read_buf ⇒ Object 



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# File 'ext/enterprise_script_service/mruby/mrbgems/mruby-io/mrblib/io.rb', line 172

def _read_buf
  return @buf if @buf && @buf.bytesize > 0
  sysread(BUF_SIZE, @buf)
end

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

15.2.20.5.3



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# File 'ext/enterprise_script_service/mruby/mrbgems/mruby-io/mrblib/io.rb', line 300

def each(&block)
  return to_enum unless block

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

#each_byte(&block) ⇒ Object Also known as: each_char

15.2.20.5.4



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# File 'ext/enterprise_script_service/mruby/mrbgems/mruby-io/mrblib/io.rb', line 310

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

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

#eof? ⇒ Boolean Also known as: eof

Returns:

  • (Boolean) 


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# File 'ext/enterprise_script_service/mruby/mrbgems/mruby-io/mrblib/io.rb', line 140

def eof?
  _check_readable
  begin
    _read_buf
    return @buf.empty?
  rescue EOFError
    return true
  end
end

#flush ⇒ Object

Raises:



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# File 'ext/enterprise_script_service/mruby/mrbgems/mruby-io/mrblib/io.rb', line 112

def flush
  # mruby-io always writes immediately (no output buffer).
  raise IOError, "closed stream" if self.closed?
  self
end

#getc ⇒ Object 



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# File 'ext/enterprise_script_service/mruby/mrbgems/mruby-io/mrblib/io.rb', line 289

def getc
  begin
    readchar
  rescue EOFError
    c = @buf[0]
    @buf[0,1]="" if c
    nil
  end
end

#gets(*args) ⇒ Object 



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# File 'ext/enterprise_script_service/mruby/mrbgems/mruby-io/mrblib/io.rb', line 276

def gets(*args)
  begin
    readline(*args)
  rescue EOFError
    nil
  end
end

#hash ⇒ Object 



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# File 'ext/enterprise_script_service/mruby/mrbgems/mruby-io/mrblib/io.rb', line 118

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

#pos ⇒ Object Also known as: tell

Raises:



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# File 'ext/enterprise_script_service/mruby/mrbgems/mruby-io/mrblib/io.rb', line 151

def pos
  raise IOError if closed?
  sysseek(0, SEEK_CUR) - @buf.bytesize
end

#pos=(i) ⇒ Object 



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# File 'ext/enterprise_script_service/mruby/mrbgems/mruby-io/mrblib/io.rb', line 157

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

#print(*args) ⇒ Object 



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# File 'ext/enterprise_script_service/mruby/mrbgems/mruby-io/mrblib/io.rb', line 345

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 'ext/enterprise_script_service/mruby/mrbgems/mruby-io/mrblib/io.rb', line 354

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

#puts(*args) ⇒ Object 



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# File 'ext/enterprise_script_service/mruby/mrbgems/mruby-io/mrblib/io.rb', line 332

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

#read(length = nil, outbuf = "") ⇒ Object 



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# File 'ext/enterprise_script_service/mruby/mrbgems/mruby-io/mrblib/io.rb', line 187

def read(length = nil, outbuf = "")
  unless length.nil?
    unless length.is_a? Integer
      raise TypeError.new "can't convert #{length.class} into Integer"
    end
    if length < 0
      raise ArgumentError.new "negative length: #{length} given"
    end
    if length == 0
      return ""   # easy case
    end
  end

  array = []
  while 1
    begin
      _read_buf
    rescue EOFError
      array = nil if array.empty? and (not length.nil?) and length != 0
      break
    end

    if length
      consume = (length <= @buf.bytesize) ? length : @buf.bytesize
      array.push IO._bufread(@buf, consume)
      length -= consume
      break if length == 0
    else
      array.push @buf
      @buf = ''
    end
  end

  if array.nil?
    outbuf.replace("")
    nil
  else
    outbuf.replace(array.join)
  end
end

#readchar ⇒ Object 



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# File 'ext/enterprise_script_service/mruby/mrbgems/mruby-io/mrblib/io.rb', line 284

def readchar
  _read_buf
  _readchar(@buf)
end

#readline(arg = "\n", limit = nil) ⇒ Object 



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# File 'ext/enterprise_script_service/mruby/mrbgems/mruby-io/mrblib/io.rb', line 228

def readline(arg = "\n", limit = nil)
  case arg
  when String
    rs = arg
  when Integer
    rs = "\n"
    limit = arg
  else
    raise ArgumentError
  end

  if rs.nil?
    return read
  end

  if rs == ""
    rs = "\n\n"
  end

  array = []
  while 1
    begin
      _read_buf
    rescue EOFError
      array = nil if array.empty?
      break
    end

    if limit && limit <= @buf.size
      array.push @buf[0, limit]
      @buf[0, limit] = ""
      break
    elsif idx = @buf.index(rs)
      len = idx + rs.size
      array.push @buf[0, len]
      @buf[0, len] = ""
      break
    else
      array.push @buf
      @buf = ''
    end
  end

  raise EOFError.new "end of file reached" if array.nil?

  array.join
end

#readlines ⇒ Object 



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# File 'ext/enterprise_script_service/mruby/mrbgems/mruby-io/mrblib/io.rb', line 324

def readlines
  ary = []
  while (line = gets)
    ary << line
  end
  ary
end

#rewind ⇒ Object 



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# File 'ext/enterprise_script_service/mruby/mrbgems/mruby-io/mrblib/io.rb', line 161

def rewind
  seek(0, SEEK_SET)
end

#seek(i, whence = SEEK_SET) ⇒ Object

Raises:



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

def seek(i, whence = SEEK_SET)
  raise IOError if closed?
  sysseek(i, whence)
  @buf = ''
  0
end

#ungetc(substr) ⇒ Object 



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# File 'ext/enterprise_script_service/mruby/mrbgems/mruby-io/mrblib/io.rb', line 177

def ungetc(substr)
  raise TypeError.new "expect String, got #{substr.class}" unless substr.is_a?(String)
  if @buf.empty?
    @buf.replace(substr)
  else
    @buf[0,0] = substr
  end
  nil
end

#write(string) ⇒ Object 



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# File 'ext/enterprise_script_service/mruby/mrbgems/mruby-io/mrblib/io.rb', line 124

def write(string)
  str = string.is_a?(String) ? string : string.to_s
  return 0 if str.empty?
  unless @buf.empty?
    # reset real pos ignore buf
    seek(pos, SEEK_SET)
  end
  len = syswrite(str)
  len
end