Initial commit

.gitignore

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+*.gem

README.md

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+#Base52
+
+Encode and Decode Base 52 Values
+
+##Description
+
+Implement functionality to the base Integer class to convert an integer into an equivalent base 52 string using the character set 0-9, A-Z, a-z excluding 
+vowels.  Additionally, implement functionality to the base String class to 
+convert a base 52 string back to an integer.
+
+##Install
+
+```
+$ gem install base52
+```
+
+## Usage
+
+```
+require 'base52'
+
+1000000000.to_52
+=> "2clyTD"
+
+"2clyTD".from_52
+=> 1000000000
+```
+
+##License
+
+The MIT License
+
+Copyright (c) 2012 Andrew Tomaka
+
+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.

Rakefile

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+require 'rake/testtask'
+
+Rake::TestTask.new do |t|
+  t.libs << 'test'
+end
+
+desc "Run tests"
+task :default => :test

base52.gemspec

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+Gem::Specification.new do |s|
+  s.name        = 'Base 52'
+  s.version     = '0.0.1'
+  s.date        = '2012-09-24'
+  s.summary     = 'Encode and Decode Base 52 Values'
+  s.description = 'Implement functionality to the base Integer class to convert
+                  an integer into an equivalent base 52 string using the 
+                  character set 0-9, A-Z, a-z excluding vowels.  Additionally, 
+                  implement functionality to the base String class to convert a
+                  base 52 string back to an integer.'
+  s.authors     = ['Andrew Tomaka']
+  s.email       = 'atomaka@gmail.com'
+  s.files       = ['lib/base52.rb']
+  s.homepage    = 'https://github.com/atomaka/base52'
+end

lib/base52.rb

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+BASE52_CHARACTERS = Array('0'..'9') + Array('A'..'Z') + Array('a'..'z') - 'AEIOUaeiou'.split(//)
+
+class String
+  def from_52
+    i = 0
+    decoded = 0
+
+    self.split(//).reverse.each do |a|
+      decoded += BASE52_CHARACTERS.index(a) * (52 ** i)
+      i += 1
+    end
+
+    decoded
+  end
+end
+
+class Integer
+  def to_52
+    return "0" if self == 0
+    
+    input = self
+    encoded = ''
+    while input > 0
+      encoded = BASE52_CHARACTERS[input % 52].to_s + encoded
+      input /= 52
+    end
+
+    encoded
+  end
+end

test/test_base52.rb

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+require 'test/unit'
+require File.dirname(__FILE__) + '/../lib/base52'
+
+class Base52Test < Test::Unit::TestCase
+  def test_to_52
+    assert_equal '0', 0.to_52
+    assert_equal '2clyTD', 1000000000.to_52
+    assert_equal 'zzzzzz', 19770609663.to_52
+  end
+
+  def test_from_52
+    assert_equal 0, '0'.from_52
+    assert_equal 1000000000, '2clyTD'.from_52
+    assert_equal 19770609663, 'zzzzzz'.from_52
+  end
+end