initial import

.gitignore

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+*.gem
+*.rbc
+.bundle
+.config
+.yardoc
+Gemfile.lock
+InstalledFiles
+_yardoc
+coverage
+doc/
+lib/bundler/man
+pkg
+rdoc
+spec/reports
+test/tmp
+test/version_tmp
+tmp
+*.bundle
+*.so
+*.o
+*.a
+mkmf.log

Gemfile

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+source 'https://rubygems.org'
+
+# Specify your gem's dependencies in chinese_numerals.gemspec
+gemspec

LICENSE.txt

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+Copyright (c) 2014 Fox Chao
+
+MIT License
+
+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.

README.md

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+# ChineseNumerals
+
+This simple monkey patching enables the conversion from Integer to Chinese Numerals easily. The single method `to_chinese(:simple => true, :decimal => false)` is the only thing you need to take care. 
+
+## Installation
+
+Add this line to your application's Gemfile:
+
+    gem 'chinese_numerals'
+
+And then execute:
+
+    $ bundle
+
+Or install it yourself as:
+
+    $ gem install chinese_numerals
+
+## Usage
+
+Check the `spec/chinese_numerals_spec.rb` to see the various outcomes.
+
+## Contributing
+
+1. Fork it ( https://github.com/[my-github-username]/chinese_numerals/fork )
+2. Create your feature branch (`git checkout -b my-new-feature`)
+3. Commit your changes (`git commit -am 'Add some feature'`)
+4. Push to the branch (`git push origin my-new-feature`)
+5. Create a new Pull Request

Rakefile

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+require "bundler/gem_tasks"
+
+require 'tasks/test'

chinese_numerals.gemspec

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+# coding: utf-8
+lib = File.expand_path('../lib', __FILE__)
+$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
+require 'chinese_numerals/version'
+
+Gem::Specification.new do |spec|
+  spec.name          = "chinese_numerals"
+  spec.version       = ChineseNumerals::VERSION
+  spec.authors       = ["Fox Chao"]
+  spec.email         = ["[email protected]"]
+  spec.summary       = %q{Convert integers to Chinese Numerals}
+  spec.description   = %q{A little tool from Steam Computing, Co., Inc.}
+  spec.homepage      = "https://rubygems.org/gems/chinese_numerals"
+  spec.license       = "MIT"
+
+  spec.files         = `git ls-files -z`.split("\x0")
+  spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
+  spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
+  spec.require_paths = ["lib"]
+
+  spec.add_development_dependency "bundler", "~> 1.6"
+  spec.add_development_dependency "rake", "~> 10.3"
+  spec.add_development_dependency "minitest", "~> 5.3"
+end

lib/chinese_numerals.rb

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+# encoding: UTF-8
+
+Integer.class_eval do
+  CHINESE_GROUPS = [ '', '萬', '億', '兆', '京', '陔' ]
+
+  FORMAL_CHINESE_NUMBERS = %w{ 零 壹 貳 參 肆 伍 陸 柒 捌 玖 }
+  FORMAL_CHINESE_DECIMALS = [ '', '拾', '佰', '仟' ]
+
+  SIMPLE_CHINESE_NUMBERS = %w{ 零 一 二 三 四 五 六 七 八 九 }
+  SIMPLE_CHINESE_DECIMALS = [ '', '十', '百', '千' ]
+
+  def to_chinese(args = {})
+    opts = {
+      :simple => true,
+      :decimal => false
+    }.merge args
+
+    chinese_numbers  = opts[:simple] ? SIMPLE_CHINESE_NUMBERS  : FORMAL_CHINESE_NUMBERS
+    chinese_decimals = opts[:simple] ? SIMPLE_CHINESE_DECIMALS : FORMAL_CHINESE_DECIMALS
+
+    str = self.to_s
+    len = str.length
+    res = ""
+
+    if opts[:decimal] && (len > 1)
+      # counting zeros if it meets
+      zeros = 0
+
+      0.upto len - 1 do |i|
+        digit = str[i].to_i
+        if digit == 0
+          zeros += 1
+        else
+          if (zeros > 0)
+            zeros = 0
+            res << chinese_numbers[0]
+          end
+          res << chinese_numbers[digit] + chinese_decimals[(len - 1 - i) % 4]
+        end
+        # append group name unless 4 zeros met
+        if (len - 1 - i) % 4 == 0
+          res << CHINESE_GROUPS[(len - 1 - i) / 4] unless zeros == 4
+          # reset zeros for each group
+          zeros = 0
+        end
+      end
+
+    else
+      # simply maps each digit
+      0.upto len - 1 do |i|
+        digit = str[i].to_i
+        res << chinese_numbers[digit]
+      end
+    end
+
+    res
+  end
+
+end

lib/chinese_numerals/version.rb

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+module ChineseNumerals
+  VERSION = "0.0.2"
+end

spec/chinese_number_spec.rb

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+$VERBOSE = true
+require 'minitest/autorun'
+require 'minitest/spec'
+
+require_relative '../lib/chinese_numerals.rb'
+
+describe Integer do
+  it "maps each digit" do
+    10000.to_chinese.must_equal("一零零零零")
+  end
+
+  it "maps each digit with formal Chinese digits" do
+    10000.to_chinese(:simple => false).must_equal("壹零零零零")
+  end
+
+  it "emits zero in decimal mode" do
+    0.to_chinese(:decimal => true).must_equal("零")
+  end
+
+  it "generates decimal notations in decimal mode" do
+    12.to_chinese(:decimal => true).must_equal("一十二")
+  end
+
+  it "shortens middle zeros in decimal mode" do
+    1002.to_chinese(:decimal => true).must_equal("一千零二")
+  end
+
+  it "omits the tail zero in decimal mode" do
+    1200.to_chinese(:decimal => true).must_equal("一千二百")
+  end
+
+  it "omits all tail zeros in decimal mode" do
+    10000000000.to_chinese(:decimal => true).must_equal("一百億")
+  end
+
+  it "knows output and omit zeros in decimal mode" do
+    10000002000.to_chinese(:decimal => true).must_equal("一百億二千")
+  end
+
+end
+