Asp Forum - Fwd: Please Forward: Ruby Quiz Submission (92

James Gray

8/31/2006 9:28:00 PM

Begin forwarded message:

> From: Eric Torreborre <etorreborre@yahoo.com>
> Date: August 31, 2006 4:20:10 PM CDT
> To: submission@rubyquiz.com
> Subject: Please Forward: Ruby Quiz Submission (92)
> Reply-To: Eric Torreborre <etorreborre@yahoo.com>
>
> Hi all,
>
> This is my first submission to the quiz and I am very glad to do
> it! I used this quiz to introduce Ruby to my fellow workers for
> today's "Dojo" (see http://bossavit.co... http://
> wiki.agilefinland.com/?CodingDojo).
>
> They found it a very gentle introduction to the language.
>
> As for myself, I found a great interest in writing properly things
> down and then having a look at all other submissions, searching for
> better ways to do things.
>
> Anyway, here is my submission, that goes around the following lines:
>
> -use of rspec (behavior driven development) to write acceptance tests
> -use of the Set class to know if days identifiers are correct
> -extension of the Range class to split an array into an array of
> ranges for consecutive values
>
> Here's the code:
>
> ===========================
> #day_range_spec.rb
> ===========================
> require "spec"
> require "day_range"
>
> context "A new DayRange" do
> specify "should accept a list of day numbers" do
> DayRange.new([1, 2, 3])
> end
>
> specify "should accept a list of abbreviated day names" do
> DayRange.new(%w{Mon Tue Fri})
> end
>
> specify "should accept a list of whole day names" do
> DayRange.new(%w{Monday Tuesday Friday})
> end
>
> specify "should raise an argument error an invalid day number is
> inputed in the list" do
> lambda {DayRange.new([1, 8])}.should_raise(ArgumentError)
> end
>
> specify "should raise an argument error an invalid abbreviated
> day is inputed in the list" do
> lambda {DayRange.new(["bla"])}.should_raise(ArgumentError)
> end
>
> specify "should raise an argument error an invalid day name is
> inputed in the list" do
> lambda {DayRange.new(["lunedi"])}.should_raise(ArgumentError)
> end
> end
>
> context "A week with a single day" do
> specify "should return the day short name only" do
> DayRange.new([7]).to_s.should_equal('Sun')
> end
> end
>
> context "An initialized DayRange" do
> specify "should sort days starting with Monday" do
> DayRange.new([3, 1]).to_s.should_equal('Mon, Wed')
> end
> end
>
> context "A week DayRange" do
> specify "should represent three or more consecutive days by
> listing the first day followed by a hyphen (-), followed by the
> last day of the range" do
> DayRange.new([1, 2, 3, 4, 5, 6, 7]).to_s.should_equal('Mon-Sun')
> end
> end
> context "A week without Thursday and Friday" do
> specify "should return 'Mon-Wed, Sat, Sun' (added hyphen)" do
> DayRange.new([1, 2, 3, 6, 7]).to_s.should_equal('Mon-Wed, Sat,
> Sun')
> end
> end
>
> ===========================
> # day_range.rb
> ===========================
> require 'set'
> require 'range'
>
> class DayRange
> def initialize(daylist)
> raise ArgumentError, "#{daylist.to_s} is not valid" unless
> Week.are_valid_identifiers?(daylist)
> @days = Week.day_indexes(daylist)
> end
>
> def to_s
> ranges = Range.split(@days)
> ranges.collect{|r| Week.short_names_from_range(r)}.join(', ')
> end
>
> end
>
> class Week
> DAYS = [[1, 'Mon', 'Monday'],
> [2, 'Tue', 'Tuesday'],
> [3, 'Wed', 'Wednesday'],
> [4, 'Thu', 'Thursday'],
> [5, 'Fri', 'Friday'],
> [6, 'Sat', 'Saturday'],
> [7, 'Sun', 'Sunday']]
>
> def self.are_valid_identifiers?(days)
> return DAYS.flatten.to_set.superset?(days.to_set)
> end
>
> def self.day_indexes(daylist)
> return DAYS.select{|d| !d.to_set.intersection
> (daylist.to_set).empty?}.collect{|d| d[0]}.sort!
> end
>
> def self.short_names_from_range(range)
> if range.to_a.size == 1
> return DAYS[range.first - 1][1]
> elsif range.to_a.size == 2
> return DAYS[range.first - 1][1] + ', ' + DAYS[range.last - 1][1]
> else
> return DAYS[range.first - 1][1] + '-' + DAYS[range.last - 1][1]
> end
> end
> end
>
> ===========================
> #range_spec.rb
> ===========================
> require "spec"
> require "range"
>
> context "A Range" do
> specify "should split a [1] array in a 1..1 range" do
> Range.split([1]).should_equal([1..1])
> end
>
> specify "should split a [1, 2] array in a 1..2 range" do
> Range.split([1, 2]).should_equal([1..2])
> end
>
> specify "should split a [1, 2, 3] array in a 1..3 range" do
> Range.split([1, 2, 3]).should_equal([1..3])
> end
>
> specify "should split a [1, 3] array in 2 ranges: [1..1, 3..3]" do
> Range.split([1, 3]).should_equal([1..1, 3..3])
> end
>
> specify "should split a [1, 2, 4] array in 2 ranges: [1..2,
> 4..4]" do
> Range.split([1, 2, 4]).should_equal([1..2, 4..4])
> end
>
> end
> ===========================
> #range.rb
> ===========================
> class Range
> def self.split(list)
> list.inject([]) do |ranges, i|
> last_range = ranges.last
> if (last_range.nil? || i > last_range.last.next)
> ranges << [i, i]
> else
> last_range[1] = i
> end
> ranges
> end.collect{|r| r.first..r.last} # transform to Range objects
> end
>
> end
>
> --------------------------------------------------
> Eric Torreborre
> LTG - Product Manager
> LEIRIOS
> tel: 33(0)6.61.48.57.65/33(0)3.81.88.62.02
> e-mail: etorreborre@yahoo.com
> blog: http://etorreborre.bl...
> --------------------------------------------------
>
>

comp.lang.ruby

Fwd: Please Forward: Ruby Quiz Submission (92

James Gray

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