IO::Like - in the Likeness of IO
A module which provides the functionality of an IO object to any including class which provides a couple of simple methods.
LINKS
- Homepage :: http://github.com/javanthropus/io-like
- Documentation :: http://rdoc.info/gems/io-like/frames
- Source :: http://github.com/javanthropus/io-like
DESCRIPTION
The IO::Like module provides all of the methods of typical IO implementations such as File; most importantly the read, write, and seek series of methods. A class which includes IO::Like needs to provide only a few methods in order to enable the higher level methods. Buffering is automatically provided by default for the methods which normally provide it in IO.
FEATURES
- All standard Ruby 1.8.6 IO operations.
- Buffered operations.
- Configurable buffer size.
KNOWN BUGS/LIMITATIONS
- Only up to version 1.8.6 of Ruby's IO interface is implemented.
- Ruby's finalization capabilities fall a bit short in a few respects, and as a result, it is impossible to cause the close, close_read, or close_write methods to be called automatically when an including class is garbage collected. Define a class open method in the manner of File.open which guarantees that an appropriate close method will be called after executing a block. Other than that, be diligent about calling the close methods.
SYNOPSIS
More examples can be found in the examples
directory of the source
distribution.
A simple ROT13 codec:
require 'io/like'
class ROT13Filter
include IO::Like
def self.open(delegate_io)
filter = new(delegate_io)
return filter unless block_given?
begin
yield(filter)
ensure
filter.close unless filter.closed?
end
end
def initialize(delegate_io)
@delegate_io = delegate_io
end
private
def encode_rot13(string)
result = string.dup
0.upto(result.length) do |i|
case result[i]
when 65..90
result[i] = (result[i] - 52) % 26 + 65
when 97..122
result[i] = (result[i] - 84) % 26 + 97
end
end
result
end
def unbuffered_read(length)
encode_rot13(@delegate_io.sysread(length))
end
def unbuffered_seek(offset, whence = IO::SEEK_SET)
@delegate_io.sysseek(offset, whence)
end
def unbuffered_write(string)
@delegate_io.syswrite(encode_rot13(string))
end
end
File.open('normal_file.txt', 'w') do |f|
f.puts('This is a test')
end
File.open('rot13_file.txt', 'w') do |f|
ROT13Filter.open(f) do |rot13|
rot13.puts('This is a test')
end
end
File.open('normal_file.txt') do |f|
ROT13Filter.open(f) do |rot13|
puts(rot13.read) # -> Guvf vf n grfg
end
end
File.open('rot13_file.txt') do |f|
ROT13Filter.open(f) do |rot13|
puts(rot13.read) # -> This is a test
end
end
File.open('normal_file.txt') do |f|
ROT13Filter.open(f) do |rot13|
rot13.pos = 5
puts(rot13.read) # -> vf n grfg
end
end
File.open('rot13_file.txt') do |f|
ROT13Filter.open(f) do |rot13|
rot13.pos = 5
puts(rot13.read) # -> is a test
end
end
File.open('normal_file.txt') do |f|
ROT13Filter.open(f) do |rot13|
ROT13Filter.open(rot13) do |rot26| # ;-)
puts(rot26.read) # -> This is a test
end
end
end
REQUIREMENTS
- None
INSTALL
Download the GEM file and install it with:
$ gem install io-like-VERSION.gem
or directly with:
$ gem install io-like
Removal is the same in either case:
$ gem uninstall io-like
DEVELOPERS
After checking out the source, run:
$ bundle install
$ bundle exec rake test yard
This will install all dependencies, run the tests/specs, and generate the documentation.
AUTHORS and CONTRIBUTORS
Thanks to all contributors. Without your help this project would not exist.
- Jeremy Bopp :: jeremy@bopp.net
- Jarred Holman :: jarred.holman@gmail.com
- Grant Gardner :: grant@lastweekend.com.au
- Jordan Pickwell :: jpickwell@users.noreply.github.com
CONTRIBUTING
Contributions for bug fixes, documentation, extensions, tests, etc. are encouraged.
- Clone the repository.
- Fix a bug or add a feature.
- Add tests for the fix or feature.
- Make a pull request.
CODING STYLE
The following points are not necessarily set in stone but should rather be used as a good guideline. Consistency is the goal of coding style, and changes will be more easily accepted if they are consistent with the rest of the code.
-
File Encoding
- UTF-8
-
Indentation
- Two spaces; no tabs
-
Line length
- Limit lines to a maximum of 80 characters
-
Comments
- Document classes, attributes, methods, and code
-
Method Calls with Arguments
- Use
a_method(arg, arg, etc)
; nota_method( arg, arg, etc )
,a_method arg, arg, etc
, or any other variation
- Use
-
Method Calls without Arguments
- Use
a_method
; avoid parenthesis
- Use
-
String Literals
- Use single quotes by default
- Use double quotes when interpolation is necessary
- Use
%{...}
and similar when embedding the quoting character is cumbersome
-
Blocks
-
do ... end
for multi-line blocks and{ ... }
for single-line blocks
-
-
Boolean Operators
- Use
&&
and||
for boolean tests; avoidand
andor
- Use
-
In General
- Try to follow the flow and style of the rest of the code
LICENSE
(The MIT License)
Copyright (c) 2020 Jeremy Bopp
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
'Software'), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
RUBYSPEC LICENSE
Files under the rubyspec
directory are copied whole or in part from the
Rubyspec project.
Copyright (c) 2008 Engine Yard, Inc. All rights reserved.
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.