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|
module RSpec
module Matchers
module BuiltIn
# @api private
# Provides the implementation for dynamic predicate matchers.
# Not intended to be inherited directly.
class DynamicPredicate < BaseMatcher
include BeHelpers
def initialize(method_name, *args, &block)
@method_name, @args, @block = method_name, args, block
end
ruby2_keywords :initialize if respond_to?(:ruby2_keywords, true)
# @private
def matches?(actual, &block)
@actual = actual
@block ||= block
predicate_accessible? && predicate_matches?
end
# @private
def does_not_match?(actual, &block)
@actual = actual
@block ||= block
predicate_accessible? && predicate_matches?(false)
end
# @api private
# @return [String]
def failure_message
failure_message_expecting(true)
end
# @api private
# @return [String]
def failure_message_when_negated
failure_message_expecting(false)
end
# @api private
# @return [String]
def description
"#{method_description}#{args_to_sentence}"
end
private
def predicate_accessible?
@actual.respond_to? predicate
end
# support 1.8.7, evaluate once at load time for performance
if String === methods.first
# :nocov:
def private_predicate?
@actual.private_methods.include? predicate.to_s
end
# :nocov:
else
def private_predicate?
@actual.private_methods.include? predicate
end
end
def predicate_result
@predicate_result = actual.__send__(predicate_method_name, *@args, &@block)
end
def predicate_method_name
predicate
end
def predicate_matches?(value=true)
if RSpec::Expectations.configuration.strict_predicate_matchers?
value == predicate_result
else
value == !!predicate_result
end
end
def root
# On 1.9, there appears to be a bug where String#match can return `false`
# rather than the match data object. Changing to Regex#match appears to
# work around this bug. For an example of this bug, see:
# https://travis-ci.org/rspec/rspec-expectations/jobs/27549635
self.class::REGEX.match(@method_name.to_s).captures.first
end
def method_description
EnglishPhrasing.split_words(@method_name)
end
def failure_message_expecting(value)
validity_message ||
"expected `#{actual_formatted}.#{predicate}#{args_to_s}` to #{expectation_of value}, got #{description_of @predicate_result}"
end
def expectation_of(value)
if RSpec::Expectations.configuration.strict_predicate_matchers?
"return #{value}"
elsif value
"be truthy"
else
"be falsey"
end
end
def validity_message
return nil if predicate_accessible?
"expected #{actual_formatted} to respond to `#{predicate}`#{failure_to_respond_explanation}"
end
def failure_to_respond_explanation
if private_predicate?
" but `#{predicate}` is a private method"
end
end
end
# @api private
# Provides the implementation for `has_<predicate>`.
# Not intended to be instantiated directly.
class Has < DynamicPredicate
# :nodoc:
REGEX = Matchers::HAS_REGEX
private
def predicate
@predicate ||= :"has_#{root}?"
end
end
# @api private
# Provides the implementation of `be_<predicate>`.
# Not intended to be instantiated directly.
class BePredicate < DynamicPredicate
# :nodoc:
REGEX = Matchers::BE_PREDICATE_REGEX
private
def predicate
@predicate ||= :"#{root}?"
end
def predicate_method_name
actual.respond_to?(predicate) ? predicate : present_tense_predicate
end
def failure_to_respond_explanation
super || if predicate == :true?
" or perhaps you meant `be true` or `be_truthy`"
elsif predicate == :false?
" or perhaps you meant `be false` or `be_falsey`"
end
end
def predicate_accessible?
super || actual.respond_to?(present_tense_predicate)
end
def present_tense_predicate
:"#{root}s?"
end
end
end
end
end
|
