class Decay::Case

Public Class Methods

new(enum_class, member) click to toggle source
# File lib/decay/case.rb, line 3
def initialize(enum_class, member)
  @enum_class = enum_class
  @member = member
  @whens = {}
end

Public Instance Methods

else(&block) click to toggle source
# 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() click to toggle source
# 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() click to toggle source
# 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) click to toggle source
# 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