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Решение на Втора задача от Мартина Величкова

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Към профила на Мартина Величкова

Резултати

  • 6 точки от тестове
  • 0 бонус точки
  • 6 точки общо
  • 11 успешни тест(а)
  • 0 неуспешни тест(а)

Код

class Song
attr_accessor :name, :artist, :album
def initialize(song_description)
@name = song_description[0]
@artist = song_description[1]
@album = song_description[2]
end
def ==(other)
@name == other.name and @artist == other.artist and @album == other.album
end
end
class Collection
include Enumerable
def initialize(songs)
@songs = songs
end
def each
@songs.each { |song| yield song }
end
def self.parse(text)
songs = text.split("\n").each_slice(4).map do |song_description|
Song.new(song_description)
end
new(songs)
end
def artists
@songs.map { |song| song.artist }.uniq
end
def albums
@songs.map { |song| song.album }.uniq
end
def names
@songs.map { |song| song.name }.uniq
end
def filter(criteria)
sub_songs = @songs.select { |song| criteria.satisfy(song) }
Collection.new(sub_songs)
end
def adjoin(other_songs)
subset = Array.new(@songs.to_a)
filtered_songs = other_songs.select { |song| not subset.member? song }
filtered_songs.each { |song| subset << song }
Collection.new(subset)
end
end
class Criteria
def self.name(song_name)
CriteriaSongName.new(song_name)
end
def self.artist(song_artist)
CriteriaSongArtist.new(song_artist)
end
def self.album(song_album)
CriteriaSongAlbum.new(song_album)
end
def |(other)
Or.new(self, other)
end
def &(other)
And.new(self, other)
end
def !
Not.new(self)
end
end
class CriteriaSongName < Criteria
def initialize(song_name)
@song_name = song_name
end
def satisfy(song)
song.name == @song_name
end
end
class CriteriaSongArtist < Criteria
def initialize(song_artist)
@song_artist = song_artist
end
def satisfy(song)
song.artist == @song_artist
end
end
class CriteriaSongAlbum < Criteria
def initialize(song_album)
@song_album = song_album
end
def satisfy(song)
song.album == @song_album
end
end
class Or
def initialize(criteria_1, criteria_2)
@criteria_1, @criteria_2 = criteria_1, criteria_2
end
def satisfy(song)
@criteria_1.satisfy(song) | @criteria_2.satisfy(song)
end
end
class And
def initialize(criteria_1, criteria_2)
@criteria_1, @criteria_2 = criteria_1, criteria_2
end
def satisfy(song)
@criteria_1.satisfy(song) & @criteria_2.satisfy(song)
end
end
class Not
def initialize(criteria)
@criteria = criteria
end
def satisfy(song)
!@criteria.satisfy(song)
end
end

Лог от изпълнението

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Finished in 0.00978 seconds
11 examples, 0 failures

История (1 версия и 0 коментара)

Мартина обнови решението на 30.10.2012 23:59 (преди над 12 години)

+class Song
+ attr_accessor :name, :artist, :album
+
+ def initialize(song_description)
+ @name = song_description[0]
+ @artist = song_description[1]
+ @album = song_description[2]
+ end
+
+ def ==(other)
+ @name == other.name and @artist == other.artist and @album == other.album
+ end
+end
+
+class Collection
+ include Enumerable
+
+ def initialize(songs)
+ @songs = songs
+ end
+
+ def each
+ @songs.each { |song| yield song }
+ end
+
+ def self.parse(text)
+ songs = text.split("\n").each_slice(4).map do |song_description|
+ Song.new(song_description)
+ end
+ new(songs)
+ end
+
+ def artists
+ @songs.map { |song| song.artist }.uniq
+ end
+
+ def albums
+ @songs.map { |song| song.album }.uniq
+ end
+
+ def names
+ @songs.map { |song| song.name }.uniq
+ end
+
+ def filter(criteria)
+ sub_songs = @songs.select { |song| criteria.satisfy(song) }
+ Collection.new(sub_songs)
+ end
+
+ def adjoin(other_songs)
+ subset = Array.new(@songs.to_a)
+ filtered_songs = other_songs.select { |song| not subset.member? song }
+ filtered_songs.each { |song| subset << song }
+ Collection.new(subset)
+ end
+end
+
+class Criteria
+ def self.name(song_name)
+ CriteriaSongName.new(song_name)
+ end
+
+ def self.artist(song_artist)
+ CriteriaSongArtist.new(song_artist)
+ end
+
+ def self.album(song_album)
+ CriteriaSongAlbum.new(song_album)
+ end
+
+ def |(other)
+ Or.new(self, other)
+ end
+
+ def &(other)
+ And.new(self, other)
+ end
+
+ def !
+ Not.new(self)
+ end
+end
+
+class CriteriaSongName < Criteria
+ def initialize(song_name)
+ @song_name = song_name
+ end
+
+ def satisfy(song)
+ song.name == @song_name
+ end
+end
+
+class CriteriaSongArtist < Criteria
+ def initialize(song_artist)
+ @song_artist = song_artist
+ end
+
+ def satisfy(song)
+ song.artist == @song_artist
+ end
+end
+
+class CriteriaSongAlbum < Criteria
+ def initialize(song_album)
+ @song_album = song_album
+ end
+
+ def satisfy(song)
+ song.album == @song_album
+ end
+end
+
+class Or
+ def initialize(criteria_1, criteria_2)
+ @criteria_1, @criteria_2 = criteria_1, criteria_2
+ end
+
+ def satisfy(song)
+ @criteria_1.satisfy(song) | @criteria_2.satisfy(song)
+ end
+end
+
+class And
+ def initialize(criteria_1, criteria_2)
+ @criteria_1, @criteria_2 = criteria_1, criteria_2
+ end
+
+ def satisfy(song)
+ @criteria_1.satisfy(song) & @criteria_2.satisfy(song)
+ end
+end
+
+class Not
+ def initialize(criteria)
+ @criteria = criteria
+ end
+
+ def satisfy(song)
+ !@criteria.satisfy(song)
+ end
+end