Class: Parsby::Backup

Inherits:
StringIO
  • Object
show all
Defined in:
lib/parsby.rb

Instance Method Summary collapse

Instance Method Details

#all ⇒ Object 



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# File 'lib/parsby.rb', line 386

def all
  with_saved_pos do
    seek 0
    read
  end
end

#back(n = back_size) ⇒ Object 



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# File 'lib/parsby.rb', line 395

def back(n = back_size)
  with_saved_pos do |saved|
    seek -n, IO::SEEK_CUR
    read n
  end
end

#back_lines ⇒ Object 



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# File 'lib/parsby.rb', line 408

def back_lines
  (back + rest_of_line).lines
end

#col ⇒ Object 



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# File 'lib/parsby.rb', line 412

def col
  back[/(?<=\A|\n).*\z/].length
end

#current_line ⇒ Object 



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# File 'lib/parsby.rb', line 416

def current_line
  with_saved_pos do
    seek(-col, IO::SEEK_CUR)
    readline.chomp
  end
end

#rest_of_line ⇒ Object 



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# File 'lib/parsby.rb', line 402

def rest_of_line
  with_saved_pos { readline }
rescue EOFError
  ""
end

#with_saved_pos(&b) ⇒ Object 



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# File 'lib/parsby.rb', line 379

def with_saved_pos(&b)
  saved = pos
  b.call saved
ensure
  seek saved
end