Class: StringIO

Inherits:
IO show all
Includes:
IO::Readable, IO::Writable
Defined in:
opal/stdlib/stringio.rb

Instance Attribute Summary collapse

Attributes inherited from IO

#lineno

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from IO

binread, #each_line, read, write

Constructor Details

#initialize(string = "", mode = 'rw') ⇒ StringIO

Returns a new instance of StringIO



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# File 'opal/stdlib/stringio.rb', line 15

def initialize(string = "", mode = 'rw')
  @string   = string
  @position = string.length

  if mode.include?('r') and not mode.include?('w')
    @closed = :write
  elsif mode.include?('w') and not mode.include?('r')
    @closed = :read
  end
end

Instance Attribute Details

#string ⇒ Object

Returns the value of attribute string



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# File 'opal/stdlib/stringio.rb', line 13

def string
  @string
end

Class Method Details

.open(string = "", mode = nil, &block) ⇒ Object 



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# File 'opal/stdlib/stringio.rb', line 5

def self.open(string = "", mode = nil, &block)
  io  = new(string, mode)
  res = block.call(io)
  io.close

  res
end

Instance Method Details

#check_readable ⇒ Object 



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# File 'opal/stdlib/stringio.rb', line 176

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

#check_writable ⇒ Object 



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# File 'opal/stdlib/stringio.rb', line 170

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

#close ⇒ Object 



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# File 'opal/stdlib/stringio.rb', line 138

def close
  @closed = :both
end

#close_read ⇒ Object 



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# File 'opal/stdlib/stringio.rb', line 142

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

#close_write ⇒ Object 



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# File 'opal/stdlib/stringio.rb', line 150

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

#closed? ⇒ Boolean

Returns:



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# File 'opal/stdlib/stringio.rb', line 158

def closed?
  @closed == :both
end

#closed_read? ⇒ Boolean

Returns:



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# File 'opal/stdlib/stringio.rb', line 162

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

#closed_write? ⇒ Boolean

Returns:



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# File 'opal/stdlib/stringio.rb', line 166

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

#each_byte(&block) ⇒ Object 



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# File 'opal/stdlib/stringio.rb', line 71

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

  check_readable

  i = @position
  until eof?
    block.call(@string[i].ord)
    i += 1
  end

  self
end

#each_char(&block) ⇒ Object 



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# File 'opal/stdlib/stringio.rb', line 85

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

  check_readable

  i = @position
  until eof?
    block.call(@string[i])
    i += 1
  end

  self
end

#eof? ⇒ Boolean Also known as: eof

Returns:



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# File 'opal/stdlib/stringio.rb', line 26

def eof?
  check_readable

  @position == @string.length
end

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



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# File 'opal/stdlib/stringio.rb', line 116

def read(length = nil, outbuf = nil)
  check_readable

  return if eof?

  string = if length
    str = @string[@position, length]
    @position += length
    str
  else
    str = @string[@position .. -1]
    @position = @string.length
    str
  end

  if outbuf
    outbuf.write(string)
  else
    string
  end
end

#rewind ⇒ Object 



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# File 'opal/stdlib/stringio.rb', line 67

def rewind
  seek 0
end

#seek(pos, whence = IO::SEEK_SET) ⇒ Object Also known as: pos= 



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# File 'opal/stdlib/stringio.rb', line 34

def seek(pos, whence = IO::SEEK_SET)
  case whence
  when IO::SEEK_SET
    raise Errno::EINVAL unless pos >= 0

    @position = pos

  when IO::SEEK_CUR
    if @position + pos > @string.length
      @position = @string.length
    else
      @position += pos
    end

  when IO::SEEK_END
    if pos > @string.length
      @position = 0
    else
      @position -= pos
    end
  end

  0
end

#tell ⇒ Object Also known as: pos 



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# File 'opal/stdlib/stringio.rb', line 59

def tell
  @position
end

#write(string) ⇒ Object 



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# File 'opal/stdlib/stringio.rb', line 99

def write(string)
  check_writable

  string = String(string)

  if @string.length == @position
    @string   += string
    @position += string.length
  else
    before = @string[0 .. @position - 1]
    after  = @string[@position + string.length .. -1]

    @string   = before + string + after
    @position += string.length
  end
end