Class: TypeStruct

Inherits:
Object
  • Object
show all
Defined in:
lib/type_struct.rb,
lib/type_struct/ext.rb,
lib/type_struct/union.rb,
lib/type_struct/hash_of.rb,
lib/type_struct/version.rb,
lib/type_struct/array_of.rb,
lib/type_struct/interface.rb

Defined Under Namespace

Modules: UnionExt, Unionable Classes: ArrayOf, HashOf, Interface, Union

Constant Summary collapse

UnionNotFoundError = 
Class.new(StandardError)
VERSION = 
"0.3.0"

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(arg) ⇒ TypeStruct

Returns a new instance of TypeStruct.



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# File 'lib/type_struct.rb', line 10

def initialize(arg)
  sym_arg = {}
  arg.each do |k, v|
    sym_arg[k.to_sym] = v
  end
  self.class.members.each do |k|
    self[k] = sym_arg[k]
  end
end

Class Method Details

.definition ⇒ Object 



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# File 'lib/type_struct.rb', line 101

def definition
  const_get(:DEFINITION)
end

.from_hash(h) ⇒ Object 



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# File 'lib/type_struct.rb', line 91

def from_hash(h)
  args = {}
  h.each do |key, value|
    key = key.to_sym
    t = type(key)
    args[key] = try_convert(t, value)
  end
  new(args)
end

.members ⇒ Object 



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# File 'lib/type_struct.rb', line 105

def members
  definition.keys
end

.new(**args, &block) ⇒ Object 



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# File 'lib/type_struct.rb', line 118

def new(**args, &block)
  c = Class.new(TypeStruct) do
    const_set :DEFINITION, args

    class << self
      alias_method :new, :original_new
    end

    args.each_key do |k|
      define_method(k) do
        instance_variable_get("@#{k}")
      end

      define_method("#{k}=") do |v|
        unless self.class.valid?(k, v)
          raise TypeError, "#{self.class}##{k} expect #{self.class.type(k)} got #{v.inspect}"
        end
        instance_variable_set("@#{k}", v)
      end
    end
  end
  if block_given?
    c.module_eval(&block)
  end
  c
end

.original_new ⇒ Object 



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# File 'lib/type_struct.rb', line 117

alias original_new new

.try_convert(klass, value) ⇒ Object 



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# File 'lib/type_struct.rb', line 51

def try_convert(klass, value)
  return nil unless !klass.nil? && !value.nil?

  if Union === klass
    errors = []
    klass.each do |k|
      t = begin
            try_convert(k, value)
          rescue TypeError => e
            errors << e
            nil
          end
      return t if !t.nil?
    end
    raise UnionNotFoundError, "#{klass} is not found with errors:\n#{errors.join("\n")}"
  elsif ArrayOf === klass
    value.map { |v| try_convert(klass.type, v) }
  elsif HashOf === klass
    return value unless Hash === value
    new_hash = {}
    value.each do |hk, hv|
      new_hash[hk] = try_convert(klass.value_type, hv)
    end
    new_hash
  elsif klass.respond_to?(:ancestors)
    if klass.ancestors.include?(TypeStruct)
      return nil unless Hash === value
      klass.from_hash(value)
    elsif klass.ancestors.include?(Struct)
      struct = klass.new
      value.each { |k, v| struct[k] = v }
      struct
    else
      value
    end
  else
    value
  end
end

.type(k) ⇒ Object 



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# File 'lib/type_struct.rb', line 109

def type(k)
  definition[k]
end

.valid?(k, v) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/type_struct.rb', line 113

def valid?(k, v)
  definition[k] === v
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/type_struct.rb', line 20

def ==(other)
  return false unless TypeStruct === other
  return false unless to_h == other.to_h
  true
end

#[](k) ⇒ Object 



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# File 'lib/type_struct.rb', line 30

def [](k)
  __send__(k)
end

#[]=(k, v) ⇒ Object 



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# File 'lib/type_struct.rb', line 26

def []=(k, v)
  __send__("#{k}=", v)
end

#inspect ⇒ Object Also known as: to_s 



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# File 'lib/type_struct.rb', line 34

def inspect
  m = to_h.map do |k, v|
    "#{k}=#{v.inspect}"
  end
  "#<#{self.class} #{m.join(', ')}>"
end

#to_h ⇒ Object 



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# File 'lib/type_struct.rb', line 42

def to_h
  m = {}
  self.class.members.each do |k|
    m[k] = self[k]
  end
  m
end