support morse code encode and decode

.gitignore

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+/.bundle/
+/.yardoc
+/_yardoc/
+/coverage/
+/doc/
+/pkg/
+/spec/reports/
+/tmp/
+tags
+Gemfile.lock

.rubocop.yml

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+inherit_from: .rubocop_todo.yml

.rubocop_todo.yml

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+# This configuration was generated by
+# `rubocop --auto-gen-config`
+# on 2018-10-04 16:16:14 +0800 using RuboCop version 0.59.2.
+# The point is for the user to remove these configuration records
+# one by one as the offenses are removed from the code base.
+# Note that changes in the inspected code, or installation of new
+# versions of RuboCop, may require this file to be generated again.
+
+# Offense count: 1
+Style/Documentation:
+  Exclude:
+    - 'spec/**/*'
+    - 'test/**/*'
+    - 'lib/morse_code/encoder.rb'
+
+# Offense count: 6
+# Configuration parameters: AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.
+# URISchemes: http, https
+Metrics/LineLength:
+  Max: 654
+
+Metrics/BlockLength:
+  Exclude:
+    - 'morse_code.gemspec'
+
+Layout/SpaceInsideArrayPercentLiteral:
+  Exclude:
+   - 'lib/morse_code.rb'    

Gemfile

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+source 'https://rubygems.org'
+
+git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
+
+# Specify your gem's dependencies in morse_code.gemspec
+gemspec

Guardfile

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+# A sample Guardfile
+# More info at https://github.com/guard/guard#readme
+
+## Uncomment and set this to only include directories you want to watch
+# directories %w(app lib config test spec features) \
+#  .select{|d| Dir.exists?(d) ? d : UI.warning("Directory #{d} does not exist")}
+
+## Note: if you are using the `directories` clause above and you are not
+## watching the project directory ('.'), then you will want to move
+## the Guardfile to a watched dir and symlink it back, e.g.
+#
+#  $ mkdir config
+#  $ mv Guardfile config/
+#  $ ln -s config/Guardfile .
+#
+# and, you'll have to watch "config/Guardfile" instead of "Guardfile"
+
+guard :minitest do
+  # with Minitest::Unit
+  watch(%r{^test/(.*)\/?test_(.*)\.rb$})
+  watch(%r{^lib/(.*/)?([^/]+)\.rb$})     { |m| "test/test_#{m[2]}.rb" }
+  watch(%r{^test/test_helper\.rb$})      { 'test' }
+
+  # with Minitest::Spec
+  # watch(%r{^spec/(.*)_spec\.rb$})
+  # watch(%r{^lib/(.+)\.rb$})         { |m| "spec/#{m[1]}_spec.rb" }
+  # watch(%r{^spec/spec_helper\.rb$}) { 'spec' }
+
+  # Rails 4
+  # watch(%r{^app/(.+)\.rb$})                               { |m| "test/#{m[1]}_test.rb" }
+  # watch(%r{^app/controllers/application_controller\.rb$}) { 'test/controllers' }
+  # watch(%r{^app/controllers/(.+)_controller\.rb$})        { |m| "test/integration/#{m[1]}_test.rb" }
+  # watch(%r{^app/views/(.+)_mailer/.+})                    { |m| "test/mailers/#{m[1]}_mailer_test.rb" }
+  # watch(%r{^lib/(.+)\.rb$})                               { |m| "test/lib/#{m[1]}_test.rb" }
+  # watch(%r{^test/.+_test\.rb$})
+  # watch(%r{^test/test_helper\.rb$}) { 'test' }
+
+  # Rails < 4
+  # watch(%r{^app/controllers/(.*)\.rb$}) { |m| "test/functional/#{m[1]}_test.rb" }
+  # watch(%r{^app/helpers/(.*)\.rb$})     { |m| "test/helpers/#{m[1]}_test.rb" }
+  # watch(%r{^app/models/(.*)\.rb$})      { |m| "test/unit/#{m[1]}_test.rb" }
+end

README.md

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+# MorseCode
+
+Welcome to your new gem! In this directory, you'll find the files you need to be able to package up your Ruby library into a gem. Put your Ruby code in the file `lib/morse_code`. To experiment with that code, run `bin/console` for an interactive prompt.
+
+TODO: Delete this and the text above, and describe your gem
+
+## Installation
+
+Add this line to your application's Gemfile:
+
+```ruby
+gem 'morse_code'
+```
+
+And then execute:
+
+    $ bundle
+
+Or install it yourself as:
+
+    $ gem install morse_code
+
+## Usage
+
+TODO: Write usage instructions here
+
+## Development
+
+After checking out the repo, run `bin/setup` to install dependencies. You can also run `bin/console` for an interactive prompt that will allow you to experiment.
+
+To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and tags, and push the `.gem` file to [rubygems.org](https://rubygems.org).
+
+## Contributing
+
+Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/morse_code.

Rakefile

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+require 'bundler/gem_tasks'
+require 'rake/testtask'
+
+Rake::TestTask.new(:test) do |t|
+  t.libs << 'test'
+  t.libs << 'lib'
+  t.test_files = FileList['test/**/test_*.rb']
+end
+
+task default: :test

bin/console

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+#!/usr/bin/env ruby
+
+require 'bundler/setup'
+require 'morse_code'
+
+# You can add fixtures and/or initialization code here to make experimenting
+# with your gem easier. You can also use a different console, if you like.
+
+# (If you use this, don't forget to add pry to your Gemfile!)
+require "pry"
+Pry.start

bin/setup

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+#!/usr/bin/env bash
+set -euo pipefail
+IFS=$'\n\t'
+set -vx
+
+bundle install
+
+# Do any other automated setup that you need to do here

lib/morse_code.rb

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+require 'morse_code/version'
+require 'morse_code/error'
+require 'morse_code/encoder'
+require 'morse_code/decoder'
+
+module MorseCode
+  ENCODE_MAP = Hash[*%w/
+    A .-           1 .----
+    B -...         2 ..---
+    C -.-.         3 ...--
+    D -..          4 ....-
+    E .            5 .....
+    F ..-.         6 -....
+    G --.          7 --...
+    H ....         8 ---..
+    I ..           9 ----.
+    J .---         0 -----
+    K -.-          . .-.-.-
+    L .-..         , --..--
+    M --           ? ..--..
+    N -.           \/ -..-.
+    O ---          : ---...
+    P .--.         ; -.-.-.
+    Q --.-         = -...-
+    R .-.          + .-.-.
+    S ...          - -....-
+    T -            _ ..--.-
+    U ..-          " .-..-.
+    V ...-         $ ...-..-
+    W .--          @ .--.-.
+    X -..-
+    Y -.--
+    Z --..
+  /]
+
+  DECODE_MAP = ENCODE_MAP.invert
+end

lib/morse_code/decoder.rb

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+require 'morse_code/error'
+
+module MorseCode
+  class Decoder
+    def initialize(content = '')
+      @content = content
+    end
+
+    def decode
+      [].tap do |decode_words|
+        @content.split(/\s+/).each do |word|
+          decode_words << (MorseCode::DECODE_MAP[word] || word)
+        end
+      end.join(' ')
+    end
+
+    def decode_with
+      @content.tap { |content| content.gsub!('DIT', '.'); content.gsub!('DAH', '-') }
+      decode
+    end
+    alias dit_dah_to decode_with
+  end
+end

lib/morse_code/encoder.rb

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+require 'morse_code/error'
+
+module MorseCode
+  class Encoder
+    def initialize(content = '')
+      @content = content.upcase
+    end
+
+    def encode
+      [].tap do |encode_words|
+        @content.split(/\s+/).each do |word|
+          encode_word = []
+          word.each_char { |char| encode_word << (MorseCode::ENCODE_MAP[char] || char) }
+          encode_words.concat(encode_word)
+        end
+      end.join(' ')
+    end
+
+    def encode_with
+      encode.tap { |content| content.gsub!('.', 'DIT'); content.gsub!('-', 'DAH') }
+    end
+    alias dit_dah encode_with
+  end
+end

lib/morse_code/error.rb

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+module MorseCode
+  class Error < StandardError; end
+
+  class NotSupported < Error; end
+end

lib/morse_code/version.rb

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+module MorseCode
+  VERSION = '0.1.0'.freeze
+end

morse_code.gemspec

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+lib = File.expand_path('lib', __dir__)
+$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
+require 'morse_code/version'
+
+Gem::Specification.new do |spec|
+  spec.name          = 'morse-code-rb'
+  spec.version       = MorseCode::VERSION
+  spec.authors       = ['YingRui Lu']
+  spec.email         = ['luyingrui518@gmail.com']
+
+  spec.summary       = 'Morse Code Tool'
+  spec.description   = 'Morse Code Tool'
+  spec.homepage      = 'https://github.com/superiorlu/morse_code'
+
+  # Prevent pushing this gem to RubyGems.org. To allow pushes either set the 'allowed_push_host'
+  # to allow pushing to a single host or delete this section to allow pushing to any host.
+  if spec.respond_to?(:metadata)
+    spec.metadata['allowed_push_host'] = 'https://rubygems.org'
+  else
+    raise 'RubyGems 2.0 or newer is required to protect against ' \
+      'public gem pushes.'
+  end
+
+  # Specify which files should be added to the gem when it is released.
+  # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
+  spec.files         = Dir['lib/**/*.rb', 'README.md']
+  spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
+  spec.require_paths = ['lib']
+  spec.licenses      = ['MIT']
+
+  spec.add_development_dependency 'bundler', '~> 1.16'
+  spec.add_development_dependency 'guard', '~> 2.14'
+  spec.add_development_dependency 'guard-minitest', '~> 2.4'
+  spec.add_development_dependency 'minitest', '~> 5.11'
+  spec.add_development_dependency 'minitest-reporters', '~> 1.3'
+  spec.add_development_dependency 'pry', '~> 0.11'
+  spec.add_development_dependency 'rake', '~> 10.0'
+  spec.add_development_dependency 'rubocop', '~> 0.59'
+end

test/test_decoder.rb

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+require 'test_helper'
+
+class TestDecoder < Minitest::Test
+
+  def test_decode
+    content = '.. .- -- .-. --- -... --- - .-.-.-'
+    decode_content = MorseCode::Decoder.new(content).decode
+    assert_equal 'I A M R O B O T .', decode_content
+  end
+
+  def test_dit_dah_to
+    content = 'DITDIT DITDAH DAHDAH DITDAHDIT DAHDAHDAH DAHDITDITDIT DAHDAHDAH DAH DITDAHDITDAHDITDAH'
+    decode_content = MorseCode::Decoder.new(content).dit_dah_to
+    assert_equal 'I A M R O B O T .', decode_content
+  end
+end

test/test_encoder.rb

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+require 'test_helper'
+
+class TestEncoder < Minitest::Test
+
+  def test_encode
+    content = 'I am Robot.'
+    encode_content = MorseCode::Encoder.new(content).encode
+    assert_equal '.. .- -- .-. --- -... --- - .-.-.-', encode_content
+  end
+
+  def test_dit_dah
+    content = 'I am Robot.'
+    encode_content = MorseCode::Encoder.new(content).dit_dah
+    assert_equal 'DITDIT DITDAH DAHDAH DITDAHDIT DAHDAHDAH DAHDITDITDIT DAHDAHDAH DAH DITDAHDITDAHDITDAH', encode_content
+  end
+end

test/test_helper.rb

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+$LOAD_PATH.unshift File.expand_path('../lib', __dir__)
+
+require 'pry'
+require 'morse_code'
+
+require 'minitest/autorun'
+
+require 'minitest/reporters'
+Minitest::Reporters.use! Minitest::Reporters::ProgressReporter.new