Class: IO

Inherits:
Object show all
Defined in:
opal/opal/corelib/io.rb

Direct Known Subclasses

File

Constant Summary collapse

SEEK_SET = 
0
SEEK_CUR = 
1
SEEK_END = 
2
SEEK_DATA = 
3
SEEK_HOLE = 
4
READABLE = 
1
WRITABLE = 
4

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(fd, flags = 'r') ⇒ IO

Returns a new instance of IO.



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# File 'opal/opal/corelib/io.rb', line 11

def initialize(fd, flags = 'r')
  @fd = fd
  @flags = flags
  @eof = false

  if flags.include?('r') && !flags.match?(/[wa+]/)
    @closed = :write
  elsif flags.match?(/[wa]/) && !flags.match?(/[r+]/)
    @closed = :read
  end
end

Instance Attribute Details

#eof ⇒ Object (readonly) Also known as: eof?

Returns the value of attribute eof.



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# File 'opal/opal/corelib/io.rb', line 41

def eof
  @eof
end

#read_proc ⇒ Object

Returns the value of attribute read_proc.



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# File 'opal/opal/corelib/io.rb', line 32

def read_proc
  @read_proc
end

#sync ⇒ Object

Returns the value of attribute sync.



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# File 'opal/opal/corelib/io.rb', line 39

def sync
  @sync
end

#tty ⇒ Object

Returns the value of attribute tty.



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# File 'opal/opal/corelib/io.rb', line 39

def tty
  @tty
end

#write_proc ⇒ Object

Returns the value of attribute write_proc.



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# File 'opal/opal/corelib/io.rb', line 31

def write_proc
  @write_proc
end

Instance Method Details

#<<(string) ⇒ Object 



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# File 'opal/opal/corelib/io.rb', line 48

def <<(string)
  write(string)
  self
end

#check_readable ⇒ Object 



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# File 'opal/opal/corelib/io.rb', line 283

def check_readable
  if closed_read?
    raise IOError, 'not opened for reading'
  end
end

#check_writable ⇒ Object 



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# File 'opal/opal/corelib/io.rb', line 276

def check_writable
  if closed_write?
    raise IOError, 'not opened for writing'
  end
end

#close ⇒ Object

Closedness



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# File 'opal/opal/corelib/io.rb', line 243

def close
  @closed = :both
end

#close_read ⇒ Object 



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# File 'opal/opal/corelib/io.rb', line 247

def close_read
  if @closed == :write
    @closed = :both
  else
    @closed = :read
  end
end

#close_write ⇒ Object 



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# File 'opal/opal/corelib/io.rb', line 255

def close_write
  if @closed == :read
    @closed = :both
  else
    @closed = :write
  end
end

#closed? ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/io.rb', line 263

def closed?
  @closed == :both
end

#closed_read? ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/io.rb', line 267

def closed_read?
  @closed == :read || @closed == :both
end

#closed_write? ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/io.rb', line 271

def closed_write?
  @closed == :write || @closed == :both
end

#each(sep = $/, *args, &block) ⇒ Object Also known as: each_line 



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# File 'opal/opal/corelib/io.rb', line 209

def each(sep = $/, *args, &block)
  return enum_for :each, sep, *args unless block_given?

  while (s = gets(sep, *args))
    yield(s)
  end

  self
end

#each_byte(&block) ⇒ Object 



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# File 'opal/opal/corelib/io.rb', line 221

def each_byte(&block)
  return enum_for :each_byte unless block_given?

  while (s = getbyte)
    yield(s)
  end

  self
end

#each_char(&block) ⇒ Object 



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# File 'opal/opal/corelib/io.rb', line 231

def each_char(&block)
  return enum_for :each_char unless block_given?

  while (s = getc)
    yield(s)
  end

  self
end

#fileno ⇒ Object 



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# File 'opal/opal/corelib/io.rb', line 23

def fileno
  @fd
end

#flush ⇒ Object 



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# File 'opal/opal/corelib/io.rb', line 44

def flush
  # noop
end

#getbyte ⇒ Object 



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# File 'opal/opal/corelib/io.rb', line 93

def getbyte
  getc&.ord
end

#getc ⇒ Object

Reading



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# File 'opal/opal/corelib/io.rb', line 75

def getc
  @read_buffer ||= ''
  parts = ''

  # Will execure at most twice - one time reading from a buffer
  # second time
  begin
    @read_buffer += parts
    if @read_buffer != ''
      ret = @read_buffer[0]
      @read_buffer = @read_buffer[1..-1]
      return ret
    end
  end while parts = sysread_noraise(1)

  nil
end

#gets(sep = false, limit = nil, opts = {}) ⇒ Object 



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# File 'opal/opal/corelib/io.rb', line 109

def gets(sep = false, limit = nil, opts = {})
  if `sep.$$is_number` && !limit
    sep, limit, opts = false, sep, limit
  end
  if `sep.$$is_hash` && !limit && opts == {}
    sep, limit, opts = false, nil, sep
  elsif `limit.$$is_hash` && opts == {}
    sep, limit, opts = sep, nil, limit
  end

  orig_sep = sep

  sep = $/ if sep == false
  sep = /\r?\n\r?\n/ if sep == ''
  sep ||= ''
  sep = sep.to_str unless orig_sep == ''

  # Try to deduce length of a regexp
  seplen = `orig_sep == '' ? 2 : sep.length`

  sep = / / if sep == ' ' # WTF is this, String#split(" ") matches all whitespaces???

  @read_buffer ||= ''
  data = ''
  ret = nil

  begin
    @read_buffer += data
    if sep != '' && (`sep.$$is_regexp` ? @read_buffer.match?(sep) : @read_buffer.include?(sep))
      orig_buffer = @read_buffer
      ret, @read_buffer = @read_buffer.split(sep, 2)
      ret += orig_buffer[ret.length, seplen] if ret != orig_buffer
      break
    end
  end while data = sysread_noraise(sep == '' ? 65_536 : 1)

  unless ret
    ret, @read_buffer = (@read_buffer || ''), ''
    ret = nil if ret == ''
  end

  if ret
    if limit
      ret = ret[0...limit]
      @read_buffer = ret[limit..-1] + @read_buffer
    end
    ret = ret.sub(/\r?\n\z/, '') if opts[:chomp]
    ret = ret.sub(/\A[\r\n]+/, '') if orig_sep == ''
  end

  $_ = ret if orig_sep == false
  ret
end

#print(*args) ⇒ Object 



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# File 'opal/opal/corelib/io.rb', line 53

def print(*args)
  %x{
    for (var i = 0, ii = args.length; i < ii; i++) {
      args[i] = #{String(`args[i]`)}
    }
    self.$write(args.join(#{$,}));
  }
  nil
end

#puts(*args) ⇒ Object 



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# File 'opal/opal/corelib/io.rb', line 63

def puts(*args)
  %x{
    for (var i = 0, ii = args.length; i < ii; i++) {
      args[i] = #{String(`args[i]`).chomp}
    }
    self.$write(args.concat([nil]).join(#{$/}));
  }
  nil
end

#read(integer = nil) ⇒ Object 



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# File 'opal/opal/corelib/io.rb', line 186

def read(integer = nil)
  @read_buffer ||= ''
  parts = ''
  ret = nil

  begin
    @read_buffer += parts
    if integer && @read_buffer.length > integer
      ret, @read_buffer = @read_buffer[0...integer], @read_buffer[integer..-1]
      return ret
    end
  end while parts = sysread_noraise(integer || 65_536)

  ret, @read_buffer = @read_buffer, ''
  ret
end

#readbyte ⇒ Object 



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# File 'opal/opal/corelib/io.rb', line 97

def readbyte
  readchar.ord
end

#readchar ⇒ Object 



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# File 'opal/opal/corelib/io.rb', line 101

def readchar
  getc || raise(EOFError, 'end of file reached')
end

#readline(*args) ⇒ Object 



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# File 'opal/opal/corelib/io.rb', line 105

def readline(*args)
  gets(*args) || raise(EOFError, 'end of file reached')
end

#readlines(separator = $/) ⇒ Object

Eaches



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# File 'opal/opal/corelib/io.rb', line 205

def readlines(separator = $/)
  each_line(separator).to_a
end

#readpartial(integer) ⇒ Object 



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# File 'opal/opal/corelib/io.rb', line 178

def readpartial(integer)
  @read_buffer ||= ''
  part = sysread(integer)
  ret, @read_buffer = @read_buffer + (part || ''), ''
  ret = nil if ret == ''
  ret
end

#sysread(integer) ⇒ Object

This method is to be overloaded, or read_proc can be changed



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# File 'opal/opal/corelib/io.rb', line 164

def sysread(integer)
  `self.read_proc(integer)` || begin
    @eof = true
    raise EOFError, 'end of file reached'
  end
end

#sysread_noraise(integer) ⇒ Object 



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# File 'opal/opal/corelib/io.rb', line 172

def sysread_noraise(integer)
  sysread(integer)
rescue EOFError
  nil
end

#tty? ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/io.rb', line 27

def tty?
  `self.tty == true`
end

#write(string) ⇒ Object 



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# File 'opal/opal/corelib/io.rb', line 34

def write(string)
  `self.write_proc(string)`
  string.size
end