Class: Aurum::Grammar::LexicalRules::CharacterSet::Interval

Inherits:
Struct
  • Object
show all
Includes:
Comparable
Defined in:
lib/aurum/grammar/lexical_rules.rb

Instance Method Summary collapse

Constructor Details

#initialize(first, last = first) ⇒ Interval

Returns a new instance of Interval.



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# File 'lib/aurum/grammar/lexical_rules.rb', line 171

def initialize first, last = first
  super first, last
end

Instance Method Details

#<=>(other) ⇒ Object 



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# File 'lib/aurum/grammar/lexical_rules.rb', line 185

def <=> other
  return first <=> other.first unless first == other.first
  (last - first) <=> (other.last - other.first)
end

#include?(char) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/aurum/grammar/lexical_rules.rb', line 174

def include? char
  char = char[0] if char.kind_of? String
  first <= char && char <= last
end

#inspect ⇒ Object 



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# File 'lib/aurum/grammar/lexical_rules.rb', line 194

def inspect
  first == last ? chr_of(first) : "#{chr_of(first)}-#{chr_of(last)}"
end

#merge!(other) ⇒ Object 



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# File 'lib/aurum/grammar/lexical_rules.rb', line 179

def merge! other
  return nil unless include?(other.first) || include?(other.last) || other.first - last == 1 || first - other.last == 1
  self.first, self.last = [first, other.first].min, [last, other.last].max
  self
end

#to_char_set ⇒ Object 



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# File 'lib/aurum/grammar/lexical_rules.rb', line 190

def to_char_set
  CharacterSet.new([self])
end