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  1. class ApiEndpoint
  2.   attr_reader :fields
  3.  
  4.   module FieldDispatcher
  5.     def method_missing(field, *args)
  6.       expanded_path = "#{@root}#{field}"
  7.  
  8.       if fields.has_key? expanded_path
  9.         fields[expanded_path]
  10.       elsif fields.keys.any? { |key| key.start_with? "#{expanded_path}." }
  11.         ApiIntermediate.new(endpoint, "#{expanded_path}.")
  12.       else
  13.         super
  14.       end
  15.     end
  16.   end
  17.  
  18.   class ApiIntermediate
  19.     attr_reader :endpoint
  20.  
  21.     def initialize(endpoint, root)
  22.       @endpoint, @root = endpoint, root
  23.     end
  24.  
  25.     def fields
  26.       @endpoint.fields
  27.     end
  28.  
  29.     include FieldDispatcher
  30.   end
  31.  
  32.   def initialize(fields={})
  33.     @fields = fields
  34.     @root   = ""
  35.   end
  36.  
  37.   include FieldDispatcher
  38.  
  39.   protected
  40.  
  41.   def endpoint
  42.     self
  43.   end
  44. end
  45.  
  46. require 'minitest/autorun'
  47.  
  48. class TestApiEndpoint < MiniTest::Unit::TestCase
  49.   def setup
  50.     @api = ApiEndpoint.new({
  51.       'foo'     => 'bar',
  52.       'jp.hoge' => 'fuga',
  53.       'jp.piyo' => 'piyo',
  54.       'jp.legacy.ruby' => '1.6.5'
  55.     })
  56.   end
  57.  
  58.   def test_plain
  59.     assert_equal 'bar', @api.foo
  60.     assert_raises NoMethodError do
  61.       @api.foobar
  62.     end
  63.   end
  64.  
  65.   def test_nested
  66.     assert_equal 'fuga', @api.jp.hoge
  67.     assert_equal 'piyo', @api.jp.piyo
  68.     assert_raises NoMethodError do
  69.       @api.jp.foobar
  70.     end
  71.   end
  72.  
  73.   def test_deeply_nested
  74.     assert_equal '1.6.5', @api.jp.legacy.ruby
  75.     assert_raises NoMethodError do
  76.       @api.jp.legacy.foobar
  77.     end
  78.   end
  79. end
Success #stdin #stdout 0.03s 5556KB
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Standard input is empty
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Loaded suite prog
Started
...
Finished in 0.000822 seconds.

3 tests, 7 assertions, 0 failures, 0 errors, 0 skips

Test run options: --seed 56210
https://ideone.com/hXpxaG
language:
Ruby (ruby 2.5.5)
created:
11 years ago
visibility:
public

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