Module: Matrix::CoercionHelper

Do not use. This module is for internal use only.

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Included In: ::Matrix, Scalar, ::Vector
Defined in:	lib/matrix.rb

Class Method Summary

.coerce_to(obj, cls, meth)

Helper method to coerce a value into a specific class.
.coerce_to_int(obj)
.coerce_to_matrix(obj)

Instance Method Summary

#apply_through_coercion(obj, oper) private

Applies the operator oper with argument obj through coercion of obj

Class Method Details

.coerce_to(obj, cls, meth)

Helper method to coerce a value into a specific class. Raises a TypeError if the coercion fails or the returned value is not of the right class. (from Rubinius)

Raises:

(TypeError)

[ GitHub ]

# File 'lib/matrix.rb', line 1528


def self.coerce_to(obj, cls, meth) # :nodoc:
  return obj if obj.kind_of?(cls)
  raise TypeError, "Expected a #{cls} but got a #{obj.class}" unless obj.respond_to? meth
  begin
    ret = obj.__send__(meth)
  rescue Exception => e
    raise TypeError, "Coercion error: #{obj.inspect}.#{meth} => #{cls} failed:\n" \
                     "(#{e.message})"
  end
  raise TypeError, "Coercion error: obj.#{meth} did NOT return a #{cls} (was #{ret.class})" unless ret.kind_of? cls
  ret
end

.coerce_to_int(obj)

[ GitHub ]

# File 'lib/matrix.rb', line 1541


def self.coerce_to_int(obj)
  coerce_to(obj, Integer, :to_int)
end

.coerce_to_matrix(obj)

[ GitHub ]

# File 'lib/matrix.rb', line 1545


def self.coerce_to_matrix(obj)
  coerce_to(obj, Matrix, :to_matrix)
end

Instance Method Details

#apply_through_coercion(obj, oper) (private)

Applies the operator oper with argument obj through coercion of obj

[ GitHub ]

# File 'lib/matrix.rb', line 1513


def apply_through_coercion(obj, oper)
  coercion = obj.coerce(self)
  raise TypeError unless coercion.is_a?(Array) && coercion.length == 2
  coercion[0].public_send(oper, coercion[1])
rescue
  raise TypeError, "#{obj.inspect} can't be coerced into #{self.class}"
end