From: Peter Vandenabeele <peter@...>
Date: 2012-01-18T03:56:23+09:00
Subject: Re: Parsing log with date time entry

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On Tue, Jan 17, 2012 at 7:44 PM, Kenichi Kamiya <kachick1@gmail.com> wrote:

> Range#=== , need #succ method in Ruby1.9.3
> under  only #<=>,  use Range#cover?
>

Thank you. For Time class, I could get it to work.

This will simplify the code for the OP.

$ irb
1.9.3-p0 :001 > t2 = Time.now
 => 2012-01-17 19:47:19 0100

1.9.3-p0 :002 > t1 = t2 - 900
 => 2012-01-17 19:32:19 0100

1.9.3-p0 :003 > time_range = t1..t2
 => 2012-01-17 19:32:19 0100..2012-01-17 19:47:19 0100

1.9.3-p0 :004 > t3 = Time.now - 300
 => 2012-01-17 19:42:41 0100

1.9.3-p0 :006 > time_range === t3
TypeError: can't iterate from Time
    from (irb):6:in `each'
    from (irb):6:in `include?'
    from (irb):6:in `include?'
    from (irb):6:in `==='
    from (irb):6
    from /home/peterv/.rvm/rubies/ruby-1.9.3-p0/bin/irb:16:in `<main>'

1.9.3-p0 :007 > time_range.cover? t3
 => true  # :-)

1.9.3-p0 :008 > time_range.cover? Time.now
 => false # :-)

However, for Float the === operator seems to work, _without_ Float#succ

1.9.3-p0 :009 > f1 = 13.6
 => 13.6
1.9.3-p0 :010 > f2 = 18.6
 => 18.6
1.9.3-p0 :011 > float_range = f1..f2
 => 13.6..18.6
1.9.3-p0 :012 > float_range === 15.5
 => true
1.9.3-p0 :013 > f1.succ
NoMethodError: undefined method `succ' for 13.6:Float
    from (irb):13
    from /home/peterv/.rvm/rubies/ruby-1.9.3-p0/bin/irb:16:in `<main>'
1.9.3-p0 :014 > float_range.cover? 15.5
 => true


So, maybe the behavior could be made similar?

I suggest that `Range#===  arg` falls back to `Range#cover? arg`
uniformily if `arg.respond_to?(:succ)` is false (and probably other
conditions).

Thanks again,

Peter

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