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Contents
module Finitio
#
# A BuiltinType generator allows capuring an information type to a type of
# the host language, here a Ruby class. For instance,
#
# Int := BuiltinType(ruby.Fixnum)
#
# The set of values captured by the information type is the same set of
# values that can be represented by the host type. In the example, `Int`
# captures the same set of numbers as ruby's Fixnum.
#
# The ruby class is used as concrete representation of the information type.
# In the example:
#
# R(Int) = Fixnum
#
# Accordingly, the `dress` transformation function has the following signature:
#
# dress :: Alpha -> Int throws TypeError
# dress :: Object -> Fixnum throws TypeError
#
class BuiltinType < Type
def initialize(ruby_type, name = nil, metadata = nil)
super(name, metadata)
@ruby_type = ruby_type
end
attr_reader :ruby_type
alias :representator :ruby_type
def default_name
@ruby_type.name.to_s
end
def include?(value)
ruby_type === value
end
# Check that `value` is a valid instance of `ruby_type` through `===` or
# raise an error.
def dress(value, handler = DressHelper.new)
handler.failed!(self, value) unless ruby_type===value
value
end
def ==(other)
super || (other.is_a?(BuiltinType) && other.ruby_type==ruby_type)
end
alias :eql? :==
def hash
self.class.hash ^ ruby_type.hash
end
end # class BuiltinType
end # module Finitio
Version data entries
10 entries across 10 versions & 1 rubygems