Created
March 20, 2009 07:48
-
-
Save nakajima/82273 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
module Enumerable | |
class Evaluator | |
instance_methods.each { |s| undef_method(s) unless s.to_s =~ /__/ } | |
def initialize(enum, invoke=nil) | |
@enum = enum | |
@invoke = invoke | |
end | |
def not | |
@negate = true | |
self | |
end | |
def method_missing(sym, *args, &blk) | |
if @invoke | |
res = @enum.send(@invoke) { |i| i.send(sym, *args, &blk) } | |
@negate ? !res : res | |
else | |
@invoke = sym.to_s + '?' | |
self | |
end | |
end | |
end | |
def not | |
Evaluator.new(self).not | |
end | |
def any | |
Evaluator.new(self, :any?) | |
end | |
def all | |
Evaluator.new(self, :all?) | |
end | |
def every | |
Evaluator.new(self, :each) | |
end | |
end |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
require 'bacon' | |
describe "any" do | |
it "provides proxy" do | |
[nil, :foo].any.nil?.should.be.true | |
[:foo, :bar].any.nil?.should.be.false | |
end | |
it "takes args" do | |
[nil, :bar].any.is_a?(Symbol).should.be.true | |
[nil, 'bar'].any.is_a?(Symbol).should.be.false | |
end | |
it "can be negated" do | |
[nil, :bar].not.any.kind_of?(Symbol).should.be.false | |
[nil, 'foo'].not.any.kind_of?(Symbol).should.be.true | |
end | |
end | |
describe "all" do | |
it "provides proxy" do | |
[nil, nil].all.nil?.should.be.true | |
[nil, :bar].all.nil?.should.be.false | |
end | |
it "takes args" do | |
[:foo, :bar].all.is_a?(Symbol).should.be.true | |
[nil, :foo].all.is_a?(Symbol).should.be.false | |
end | |
it "can be negated" do | |
[:foo, :bar].not.all.kind_of?(Symbol).should.be.false | |
[nil, :foo].not.all.kind_of?(Symbol).should.be.true | |
end | |
end | |
describe "every" do | |
it "provides proxy" do | |
a = ['foo', 'bar'] | |
a.every.upcase! | |
a.should == ['FOO', 'BAR'] | |
end | |
it "takes args and block" do | |
a = ['foo', 'bar'] | |
a.every.gsub!(/^./) { |m| m.upcase } | |
a.should == ['Foo', 'Bar'] | |
end | |
end |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment