Module: Zip::IOExtras::AbstractInputStream

Includes:
Enumerable, FakeIO
Included in:
Zip::InputStream, NullInputStream
Defined in:
lib/zip/ioextras/abstract_input_stream.rb

Overview

Implements many of the convenience methods of IO such as gets, getc, readline and readlines depends on: input_finished?, produce_input and read

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from FakeIO

#kind_of?

Instance Attribute Details

#linenoObject

Returns the value of attribute lineno


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# File 'lib/zip/ioextras/abstract_input_stream.rb', line 17

def lineno
  @lineno
end

#posObject (readonly)

Returns the value of attribute pos


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# File 'lib/zip/ioextras/abstract_input_stream.rb', line 18

def pos
  @pos
end

Instance Method Details

#each_line(a_sep_string = $/) ⇒ Object Also known as: each


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# File 'lib/zip/ioextras/abstract_input_stream.rb', line 103

def each_line(a_sep_string = $/)
  yield readline(a_sep_string) while true
rescue EOFError
end

#flushObject


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# File 'lib/zip/ioextras/abstract_input_stream.rb', line 91

def flush
  ret_val        = @output_buffer
  @output_buffer = ''
  ret_val
end

#gets(a_sep_string = $/, number_of_bytes = nil) ⇒ Object


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# File 'lib/zip/ioextras/abstract_input_stream.rb', line 57

def gets(a_sep_string = $/, number_of_bytes = nil)
  @lineno = @lineno.next

  if number_of_bytes.respond_to?(:to_int)
    number_of_bytes = number_of_bytes.to_int
    a_sep_string = a_sep_string.to_str if a_sep_string
  elsif a_sep_string.respond_to?(:to_int)
    number_of_bytes = a_sep_string.to_int
    a_sep_string    = $/
  else
    number_of_bytes = nil
    a_sep_string = a_sep_string.to_str if a_sep_string
  end

  return read(number_of_bytes) if a_sep_string.nil?
  a_sep_string = "#{$/}#{$/}" if a_sep_string.empty?

  buffer_index = 0
  over_limit   = (number_of_bytes && @output_buffer.bytesize >= number_of_bytes)
  while (match_index = @output_buffer.index(a_sep_string, buffer_index)).nil? && !over_limit
    buffer_index = [buffer_index, @output_buffer.bytesize - a_sep_string.bytesize].max
    return @output_buffer.empty? ? nil : flush if input_finished?
    @output_buffer << produce_input
    over_limit = (number_of_bytes && @output_buffer.bytesize >= number_of_bytes)
  end
  sep_index = [match_index + a_sep_string.bytesize, number_of_bytes || @output_buffer.bytesize].min
  @pos += sep_index
  @output_buffer.slice!(0...sep_index)
end

#initializeObject


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# File 'lib/zip/ioextras/abstract_input_stream.rb', line 10

def initialize
  super
  @lineno        = 0
  @pos           = 0
  @output_buffer = ''
end

#read(number_of_bytes = nil, buf = '') ⇒ Object


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# File 'lib/zip/ioextras/abstract_input_stream.rb', line 20

def read(number_of_bytes = nil, buf = '')
  tbuf = if @output_buffer.bytesize > 0
           if number_of_bytes <= @output_buffer.bytesize
             @output_buffer.slice!(0, number_of_bytes)
           else
             number_of_bytes -= @output_buffer.bytesize if number_of_bytes
             rbuf = sysread(number_of_bytes, buf)
             out  = @output_buffer
             out << rbuf if rbuf
             @output_buffer = ''
             out
           end
         else
           sysread(number_of_bytes, buf)
         end

  if tbuf.nil? || tbuf.empty?
    return nil if number_of_bytes
    return ''
  end

  @pos += tbuf.length

  if buf
    buf.replace(tbuf)
  else
    buf = tbuf
  end
  buf
end

#readline(a_sep_string = $/) ⇒ Object

Raises:

  • (EOFError)

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# File 'lib/zip/ioextras/abstract_input_stream.rb', line 97

def readline(a_sep_string = $/)
  ret_val = gets(a_sep_string)
  raise EOFError unless ret_val
  ret_val
end

#readlines(a_sep_string = $/) ⇒ Object


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# File 'lib/zip/ioextras/abstract_input_stream.rb', line 51

def readlines(a_sep_string = $/)
  ret_val = []
  each_line(a_sep_string) { |line| ret_val << line }
  ret_val
end

#ungetc(byte) ⇒ Object


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# File 'lib/zip/ioextras/abstract_input_stream.rb', line 87

def ungetc(byte)
  @output_buffer = byte.chr + @output_buffer
end