Class: Range

Inherits:
Object
  • Object
show all
Defined in:
lib/scheduling/intersection.rb

Defined Under Namespace

Classes: RangeDecreasingError

Instance Method Summary collapse

Instance Method Details

#decreasing? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/scheduling/intersection.rb', line 4

def decreasing?
  if exclude_end?
    last < first
  else
    last <= first
  end
end

#intersect?(other) ⇒ Boolean

Returns:

  • (Boolean)

Raises:



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# File 'lib/scheduling/intersection.rb', line 12

def intersect? other
  raise RangeDecreasingError if other.decreasing?

  if other.first > last
    return false
  elsif other.first == last && exclude_end?
    return false
  elsif other.last < first
    return false
  elsif other.last == first && other.exclude_end?
    return false
  else
    return true
  end
end

#intersection(other) ⇒ Object Also known as: &, intersect

Raises:



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# File 'lib/scheduling/intersection.rb', line 28

def intersection(other)
  raise RangeDecreasingError if other.decreasing?

  if intersect?(other)
    if include? other.first
      start = other.first
    else  # other.first < first
      start = first
    end

    if exclude_end?
      if other.exclude_end?
        return start...(last < other.last ? last : other.last)
      else # other is inclusive
        if other.last <= last
          return start..other.last
        else
          return start...last
        end
      end
    else # self is inclusize
      if other.exclude_end?
        if other.last >= last
          return start..last
        else other.last < last
          return start...other.last
        end
      else # other is inclusive as well
        return start..(last < other.last ? last : other.last)
      end
    end
  end
  
  return nil
end