Sha256: 41cc83f19e4cee13b78ff5466ad215e7e3800e0b29c99586f17e4ccd947bdffc
Contents?: true
Size: 1.92 KB
Versions: 8
Compression:
Stored size: 1.92 KB
Contents
# frozen_string_literal: true
require 'domainic/type/behavior'
module Domainic
module Type
# A type that validates objects based on their method interface
#
# This type implements duck typing validation by checking whether objects respond
# to specific methods. It supports both positive validation (must respond to methods)
# and negative validation (must not respond to methods).
#
# @example Validating a simple interface
# type = DuckType.responding_to(:to_s).not_responding_to(:to_h)
# type.validate("string") # => true
# type.validate(Object.new) # => true
# type.validate({}) # => false (responds to :to_h)
#
# @author {https://aaronmallen.me Aaron Allen}
# @since 0.1.0
class DuckType
include Behavior
# Add method exclusion constraints to the type
#
# @example
# type = DuckType.new.not_responding_to(:foo, :bar)
#
# @param methods [Array<String, Symbol>] the methods that must not be present
#
# @return [self] the type for method chaining
# @rbs (*String | Symbol methods) -> self
def not_responding_to(*methods)
not_methods = methods.map do |method|
@constraints.prepare(:self, :not, @constraints.prepare(:self, :method_presence, method))
end
constrain :self, :and, not_methods, concerning: :method_exclusion
end
# Add method presence constraints to the type
#
# @example
# type = DuckType.new.responding_to(:foo, :bar)
#
# @param methods [Array<String, Symbol>] the methods that must be present
#
# @return [self] the type for method chaining
# @rbs (*String | Symbol methods) -> self
def responding_to(*methods)
methods = methods.map { |method| @constraints.prepare :self, :method_presence, method }
constrain :self, :and, methods, concerning: :method_presence
end
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems