Class: Decay::Case

Inherits:
Object
  • Object
show all
Defined in:
lib/decay/case.rb

Instance Method Summary collapse

Constructor Details

#initialize(enum_class, member) ⇒ Case

Returns a new instance of Case.



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# File 'lib/decay/case.rb', line 3

def initialize(enum_class, member)
  @enum_class = enum_class
  @member = member
  @whens = {}
end

Instance Method Details

#else(&block) ⇒ Object 



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# File 'lib/decay/case.rb', line 19

def else(&block)
  @enum_class.keys.each do |key|
    if !@whens.key?(key)
      @whens[key] = block
    end
  end

  self
end

#raise_unknown_key ⇒ Object

Raises:



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# File 'lib/decay/case.rb', line 46

def raise_unknown_key
  valid_keys = @enum_class.keys.map(&:inspect).map { |str| "`#{str}'" }
  raise Error::UnknownKey,
    "Attempted to search for unknown key `#{@member.value.inspect}'. " \
    "Valid options are #{valid_keys.join(", ")}"
end

#result ⇒ Object 



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# File 'lib/decay/case.rb', line 29

def result
  if @whens.keys.size != @enum_class.keys.size
    undefined_cases =
      (@whens.keys - @enum_class.keys)
        .map(&:inspect).map { |str| "`#{str}'" }

    raise Error::UndefinedCase,
      "Some cases aren't yet covered: #{undefined_cases.join(", ")}"
  end

  if @whens.key?(@member.key)
    @whens[@member.key].call(@member)
  else
    raise_unknown_key
  end
end

#when(key, &block) ⇒ Object 



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# File 'lib/decay/case.rb', line 9

def when(key, &block)
  if @enum_class.keys.include?(key)
    @whens[key] = block
  else
    raise_unknown_key
  end

  self
end