Module: Contracts

Defined in:
lib/contracts/builtin_contracts.rb,
lib/contracts.rb,
lib/contracts/engine.rb,
lib/contracts/errors.rb,
lib/contracts/support.rb,
lib/contracts/version.rb,
lib/contracts/call_with.rb,
lib/contracts/decorators.rb,
lib/contracts/formatters.rb,
lib/contracts/invariants.rb,
lib/contracts/validators.rb,
lib/contracts/engine/base.rb,
lib/contracts/engine/target.rb,
lib/contracts/method_handler.rb,
lib/contracts/method_reference.rb,
lib/contracts/engine/eigenclass.rb

Overview

rdoc This module contains all the builtin contracts. If you want to use them, first:

import Contracts

And then use these or write your own!

A simple example:

Contract Num, Num => Num
def add(a, b)
  a + b
end

The contract is Contract Num, Num, Num. That says that the add function takes two numbers and returns a number.

Defined Under Namespace

Modules: CallWith, Engine, Formatters, Invariants, MethodDecorators, Support, Validators Classes: And, Any, Args, Bool, CallableClass, CollectionOf, ContractsNotIncluded, Decorator, Eq, Exactly, Func, HashOf, KeywordArgs, Maybe, MethodHandler, MethodReference, Nat, Neg, None, Not, Num, Optional, Or, Pos, RangeOf, RespondTo, Send, SingletonMethodReference, Xor

Constant Summary collapse

VERSION = 
"0.10"
ArrayOf =

Takes a contract. The related argument must be an array. Checks the contract against every element of the array. If it passes for all elements, the contract passes. Example: ArrayOf[Num]

CollectionOf::Factory.new(Array)
SetOf =

Takes a contract. The related argument must be a set. Checks the contract against every element of the set. If it passes for all elements, the contract passes. Example: SetOf[Num]

CollectionOf::Factory.new(Set)

Class Method Summary collapse

Class Method Details

.common(base) ⇒ Object 



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# File 'lib/contracts.rb', line 22

def self.common(base)
  return if base.respond_to?(:Contract)

  base.extend(MethodDecorators)

  base.instance_eval do
    def functype(funcname)
      contracts = Engine.fetch_from(self).decorated_methods_for(:class_methods, funcname)
      if contracts.nil?
        "No contract for #{self}.#{funcname}"
      else
        "#{funcname} :: #{contracts[0]}"
      end
    end
  end

  base.class_eval do
    # TODO: deprecate
    # Required when contracts are included in global scope
    def Contract(*args)
      self.class.Contract(*args)
    end

    def functype(funcname)
      contracts = Engine.fetch_from(self.class).decorated_methods_for(:instance_methods, funcname)
      if contracts.nil?
        "No contract for #{self.class}.#{funcname}"
      else
        "#{funcname} :: #{contracts[0]}"
      end
    end
  end
end

.extended(base) ⇒ Object 



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# File 'lib/contracts.rb', line 18

def self.extended(base)
  common(base)
end

.included(base) ⇒ Object 



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# File 'lib/contracts.rb', line 14

def self.included(base)
  common(base)
end