Class: Vers::Interval

Inherits:
Object
  • Object
show all
Defined in:
lib/vers/interval.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(min: nil, max: nil, min_inclusive: true, max_inclusive: true) ⇒ Interval

Returns a new instance of Interval.



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# File 'lib/vers/interval.rb', line 9

def initialize(min: nil, max: nil, min_inclusive: true, max_inclusive: true)
  @min = min
  @max = max
  @min_inclusive = min_inclusive
  @max_inclusive = max_inclusive

  validate_bounds!
end

Instance Attribute Details

#max ⇒ Object (readonly)

Returns the value of attribute max.



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# File 'lib/vers/interval.rb', line 7

def max
  @max
end

#max_inclusive ⇒ Object (readonly)

Returns the value of attribute max_inclusive.



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# File 'lib/vers/interval.rb', line 7

def max_inclusive
  @max_inclusive
end

#min ⇒ Object (readonly)

Returns the value of attribute min.



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# File 'lib/vers/interval.rb', line 7

def min
  @min
end

#min_inclusive ⇒ Object (readonly)

Returns the value of attribute min_inclusive.



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# File 'lib/vers/interval.rb', line 7

def min_inclusive
  @min_inclusive
end

Class Method Details

.empty ⇒ Object 



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# File 'lib/vers/interval.rb', line 18

def self.empty
  new(min: "1", max: "0", min_inclusive: true, max_inclusive: true)
end

.exact(version) ⇒ Object 



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# File 'lib/vers/interval.rb', line 26

def self.exact(version)
  new(min: version, max: version, min_inclusive: true, max_inclusive: true)
end

.greater_than(version, inclusive: false) ⇒ Object 



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# File 'lib/vers/interval.rb', line 30

def self.greater_than(version, inclusive: false)
  new(min: version, min_inclusive: inclusive)
end

.less_than(version, inclusive: false) ⇒ Object 



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# File 'lib/vers/interval.rb', line 34

def self.less_than(version, inclusive: false)
  new(max: version, max_inclusive: inclusive)
end

.unbounded ⇒ Object 



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# File 'lib/vers/interval.rb', line 22

def self.unbounded
  new
end

Instance Method Details

#adjacent?(other) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/vers/interval.rb', line 181

def adjacent?(other)
  return false if empty? || other.empty?
  
  if max && other.min && version_compare(max, other.min) == 0
    return (max_inclusive && !other.min_inclusive) || (!max_inclusive && other.min_inclusive)
  end
  
  if min && other.max && version_compare(min, other.max) == 0
    return (min_inclusive && !other.max_inclusive) || (!min_inclusive && other.max_inclusive)
  end
  
  false
end

#contains?(version) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/vers/interval.rb', line 48

def contains?(version)
  return false if empty?
  return true if unbounded?

  within_min = min.nil? || 
               (min_inclusive ? version_compare(version, min) >= 0 : version_compare(version, min) > 0)
  
  within_max = max.nil? || 
               (max_inclusive ? version_compare(version, max) <= 0 : version_compare(version, max) < 0)

  within_min && within_max
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/vers/interval.rb', line 38

def empty?
  return true if min && max && version_compare(min, max) > 0
  return true if min && max && version_compare(min, max) == 0 && (!min_inclusive || !max_inclusive)
  false
end

#intersect(other) ⇒ Object 



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# File 'lib/vers/interval.rb', line 61

def intersect(other)
  return self.class.empty if empty? || other.empty?

  new_min = nil
  new_min_inclusive = true
  new_max = nil
  new_max_inclusive = true

  if min && other.min
    comparison = version_compare(min, other.min)
    if comparison > 0
      new_min = min
      new_min_inclusive = min_inclusive
    elsif comparison < 0
      new_min = other.min
      new_min_inclusive = other.min_inclusive
    else
      new_min = min
      new_min_inclusive = min_inclusive && other.min_inclusive
    end
  elsif min
    new_min = min
    new_min_inclusive = min_inclusive
  elsif other.min
    new_min = other.min
    new_min_inclusive = other.min_inclusive
  end

  if max && other.max
    comparison = version_compare(max, other.max)
    if comparison < 0
      new_max = max
      new_max_inclusive = max_inclusive
    elsif comparison > 0
      new_max = other.max
      new_max_inclusive = other.max_inclusive
    else
      new_max = max
      new_max_inclusive = max_inclusive && other.max_inclusive
    end
  elsif max
    new_max = max
    new_max_inclusive = max_inclusive
  elsif other.max
    new_max = other.max
    new_max_inclusive = other.max_inclusive
  end

  self.class.new(
    min: new_min,
    max: new_max,
    min_inclusive: new_min_inclusive,
    max_inclusive: new_max_inclusive
  )
end

#overlaps?(other) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/vers/interval.rb', line 176

def overlaps?(other)
  return false if empty? || other.empty?
  !intersect(other).empty?
end

#to_s ⇒ Object 



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# File 'lib/vers/interval.rb', line 195

def to_s
  return "∅" if empty?
  return "(-∞,+∞)" if unbounded?

  min_bracket = min_inclusive ? "[" : "("
  max_bracket = max_inclusive ? "]" : ")"
  min_str = min || "-∞"
  max_str = max || "+∞"

  "#{min_bracket}#{min_str},#{max_str}#{max_bracket}"
end

#unbounded? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/vers/interval.rb', line 44

def unbounded?
  min.nil? && max.nil?
end

#union(other) ⇒ Object 



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# File 'lib/vers/interval.rb', line 117

def union(other)
  return other if empty?
  return self if other.empty?

  return nil unless overlaps?(other) || adjacent?(other)

  new_min = nil
  new_min_inclusive = true
  new_max = nil
  new_max_inclusive = true

  if min && other.min
    comparison = version_compare(min, other.min)
    if comparison < 0
      new_min = min
      new_min_inclusive = min_inclusive
    elsif comparison > 0
      new_min = other.min
      new_min_inclusive = other.min_inclusive
    else
      new_min = min
      new_min_inclusive = min_inclusive || other.min_inclusive
    end
  elsif min.nil?
    new_min = other.min
    new_min_inclusive = other.min_inclusive
  elsif other.min.nil?
    new_min = min
    new_min_inclusive = min_inclusive
  end

  if max && other.max
    comparison = version_compare(max, other.max)
    if comparison > 0
      new_max = max
      new_max_inclusive = max_inclusive
    elsif comparison < 0
      new_max = other.max
      new_max_inclusive = other.max_inclusive
    else
      new_max = max
      new_max_inclusive = max_inclusive || other.max_inclusive
    end
  elsif max.nil?
    new_max = other.max
    new_max_inclusive = other.max_inclusive
  elsif other.max.nil?
    new_max = max
    new_max_inclusive = max_inclusive
  end

  self.class.new(
    min: new_min,
    max: new_max,
    min_inclusive: new_min_inclusive,
    max_inclusive: new_max_inclusive
  )
end