From: Kaushik Sridharan <skaushik@hotmail.com>
Date: October 22, 2007 12:36:02 AM CDT
To: <submission@rubyquiz.com>
Subject: Correction (was RE: [QUIZ] Please Forward: Ruby Quiz Submission (Time Window #144))Sorry, it seems that Hotmail has messed up the formatting.
I am sending the code again, this time as a file attachment. I have also created a pastie:
Thanks, and sorry for the troubles.
-K
> From: skaushik@hotmail.com
> To: submission@rubyquiz.com
> Subject: [QUIZ] Please Forward: Ruby Quiz Submission (Time Window #144)
> Date: Mon, 22 Oct 2007 10:54:02 +0530
>
> Hello,
>
> Could you forward my ruby quiz submission to the mailing list please?
>
> Thanks,
>
> -K
>
> - - - -
>
> #!/usr/bin/ruby
> #
> # Submission for RubyQuiz #144 - Time Window
> # Ruby Quiz - Time Window (#144)
> #
> # Kaushik Sridharan
> # 20-Oct-2007
> #
>
> class TimeWindow
>
> #
> # Rule is a helper class used by TimeWindow. Each rule
> # instance represents one of the semicolon-separated
> # segments in the time window specification.
> #
> # A Rule object maintains a day range and a time range
> # against which it checks the input. The day range is
> # simply an array of booleans for every day of the week.
> # The time range is a Range object with the bounds defined
> # as seconds within a day. If either the day range or the
> # time range is not provided, it defaults to the entire
> # week and entire day respectively.
> #
> # A time value is said to match a rule when it satisfies
> # the day range and the time range.
> #
> class Rule
>
> DAYS = %w(sun mon tue wed thu fri sat)
>
> # Initialize a rule. The str parameter is a single segment
> # of the range specification.
> # Examples: 'Sat-Sun'
> # 'Mon Wed 0700-0900'
> def initialize(str)
> @day_range =
> @time_ranges =
>
> str.split.each do |seg|
> if seg =~ /^([A-Za-z]+)-?([A-Za-z]*)/
> from = DAYS.index($1.downcase)
> to = DAYS.index($2.downcase) || from
> throw 'Invalid day' if !from or !to
> begin
> @day_range[from] = true
> from = (from + 1) % 7
> end while from != (to + 1) % 7
> elsif seg =~/^(\d+)-?(\d*)/
> from, to = $1.to_i, ($2 || $1).to_i
> from_min = (from / 100) * 3600 + (from % 100)
> to_min = (to / 100) * 3600 + (to % 100)
> @time_ranges << (from_min ... to_min)
> end
>
> @day_range = [true] * 7 if @day_range.empty?
> @time_ranges << (0 ... (24 * 60 * 60)) if @time_ranges.empty?
> end
>
> # Return true if the time object falls within the interval
> # defined by this rule.
> def include?(time)
> return false if not @day_range[time.wday]
> secs = time.hour * 60 * 60 + time.min * 60 + time.sec
> @time_ranges.each do |r|
> return true if r.include?(secs)
> end
> return false
> end
>
> end
>
> # Initialize the time range. The str parameter is a sequence
> # of semi-colon separated rules. Also handle the case
> # that an empty string means all the time.
> # Example: 'Sat-Sun; Mon Wed 0700-0900; Thu 0700-0900 1000-1200'
> def initialize(str)
> @rules = str.split(';').collect { |seg| Rule.new(seg) }
> @rules << Rule.new('') if @rules.empty?
> end
>
> # Return true if at least one rule matches the given time.
> def include?(time)
> @rules.each do |rule|
> return true if rule.include?(time)
> end
> return false
> end
>
> end
>
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time-window.rb (2.53 KB)
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