Class: Antlr4ruby::RangeSet

Inherits:
Object
  • Object
show all
Defined in:
lib/antlr4ruby/misc/range_set.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data = []) ⇒ RangeSet 



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# File 'lib/antlr4ruby/misc/range_set.rb', line 8

def initialize(data = [])
  @data = data
end

Instance Attribute Details

#data ⇒ Object

Returns the value of attribute data.



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# File 'lib/antlr4ruby/misc/range_set.rb', line 6

def data
  @data
end

Instance Method Details

#&(other) ⇒ Object 



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# File 'lib/antlr4ruby/misc/range_set.rb', line 82

def & (other)
  result = []
  i, j = 0, 0

  while i < data.length && j < other.data.length
    while j < other.data.length && data[i].min > other.data[j].max
      j += 1
    end
    break if j >= other.data.length
    while i < data.length && other.data[j].min > data[i].max
      i += 1
    end
    break if i >= data.length


    a, b = data[i], other.data[j]
    if a.cover?(b)
      result << b; j += 1
    elsif b.cover?(a)
      result << a; i += 1
    elsif a.include?(b.min)
      result << (b.min..a.max); i += 1
    elsif b.include?(a.min)
      result << (a.min..b.max); j += 1

    end
  end

  RangeSet.new(result)
  # other.data.each do |a|
  #   data.each do |b|
  #     next if a.min > b.max || a.max < b.min
  #     if a.cover?(b)
  #       result.push(b)
  #     elsif b.cover?(a)
  #       result.push(a)
  #     else
  #       start = a.min > b.min ? a.min : b.min
  #       stop = a.max < b.max ? a.max : b.max
  #       result.push(start..stop)
  #     end
  #   end
  # end
  # RangeSet.new(result)
end

#+(other) ⇒ Object 



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# File 'lib/antlr4ruby/misc/range_set.rb', line 42

def + (other)
  # other_data = other.data.reverse
  # range = other_data.pop
  # i = 0
  # result = []
  # while range && i < data.length
  #   a = data[i]
  #   if a.min > range.max + 1
  #     new_range = other_data.pop
  #     result << range; range = other_data.pop
  #   elsif a.max < range.min - 1
  #     result << a; i += 1
  #   else
  #     # 直接将 a 合并到 range 里面
  #     start = a.min < range.min ? a.min : range.min
  #     stop = a.max > range.max ? a.max : range.max
  #     range = start..stop; i += 1
  #   end
  #
  # end
  #
  # result << range if range
  # while i < data.length
  #   result << data[i]; i += 1
  # end
  #
  # while other_data.length > 0
  #   result << other_data.pop
  # end
  # RangeSet.new(result)
  #
  result = self.clone
  other.data.each { |item| result.add(item) }
  result
end

#-(other) ⇒ Object 



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# File 'lib/antlr4ruby/misc/range_set.rb', line 154

def - (other)
  result = self.clone
  other.data.each { |item| result.delete(item) }
  result
end

#==(other) ⇒ Object 



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# File 'lib/antlr4ruby/misc/range_set.rb', line 217

def == (other)
  self.eql?(other)
end

#add(range) ⇒ Object 



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# File 'lib/antlr4ruby/misc/range_set.rb', line 16

def add(range)
  i = 0
  result = []
  while i < data.length
    a = data[i]
    if a.min > range.max + 1
      break
    elsif a.max < range.min - 1
      result << a; i += 1; next
    else
      # 直接将 a 合并到 range 里面
      start = a.min < range.min ? a.min : range.min
      stop = a.max > range.max ? a.max : range.max
      range = start..stop; i += 1
    end
  end

  result << range
  while i < data.length
    result << data[i]; i += 1
  end


  @data = result
end

#add_all(ranges) ⇒ Object 



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# File 'lib/antlr4ruby/misc/range_set.rb', line 128

def add_all(ranges)
  other_data = ranges.instance_of?(RangeSet) ? ranges.data : ranges
  other_data.each do |item|
    add(item)
  end
end

#clear ⇒ Object 



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# File 'lib/antlr4ruby/misc/range_set.rb', line 12

def clear
  data.clear
end

#complement(total) ⇒ Object 



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# File 'lib/antlr4ruby/misc/range_set.rb', line 160

def complement(total)
  total - self
end

#cover?(range) ⇒ Boolean 



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# File 'lib/antlr4ruby/misc/range_set.rb', line 177

def cover?(range)
  data.each do |item|
    return true if item.cover?(range)
  end
  false
end

#delete(range) ⇒ Object 



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# File 'lib/antlr4ruby/misc/range_set.rb', line 135

def delete(range)
  result = []
  data.each do |item|
    next if range.cover?(item)
    result.push(item.min...range.min) if item.include?(range.min) && range.min > item.min
    result.push(range.max + 1..item.max) if item.include?(range.max) && range.max < item.max
    result.push(item) if item.max < range.min || item.min > range.max
  end

  @data = result
end

#delete_all(ranges) ⇒ Object 



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# File 'lib/antlr4ruby/misc/range_set.rb', line 147

def delete_all(ranges)
  other_data = ranges.instance_of?(RangeSet) ? ranges.data : ranges
  other_data.each do |item|
    delete(item)
  end
end

#empty? ⇒ Boolean 



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# File 'lib/antlr4ruby/misc/range_set.rb', line 168

def empty?
  data.empty?
end

#eql?(other) ⇒ Boolean 



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# File 'lib/antlr4ruby/misc/range_set.rb', line 209

def eql?(other)
  return false if !other || data.length != other.data.length
  data.length.times do |i|
    return false unless data[i].eql?(other.data[i])
  end
  true
end

#include?(n) ⇒ Boolean 



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# File 'lib/antlr4ruby/misc/range_set.rb', line 172

def include?(n)
  data.each { |item| return true if item.include?(n) }
  false
end

#nil? ⇒ Boolean 



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# File 'lib/antlr4ruby/misc/range_set.rb', line 164

def nil?
  data.empty?
end

#start ⇒ Object 



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# File 'lib/antlr4ruby/misc/range_set.rb', line 184

def start
  nil if empty?
  data.sort! do |a, b|
    a.min == b.min ? a.max <=> b.max : a.min <=> b.min
  end

  data[0].min
end

#stop ⇒ Object 



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# File 'lib/antlr4ruby/misc/range_set.rb', line 193

def stop
  nil if empty?
  data.sort! do |a, b|
    a.min == b.min ? a.max <=> b.max : a.min <=> b.min
  end
  data[-1].max
end

#to_a ⇒ Object 



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# File 'lib/antlr4ruby/misc/range_set.rb', line 201

def to_a
  @data
end

#to_set ⇒ Object 



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# File 'lib/antlr4ruby/misc/range_set.rb', line 205

def to_set
  data.to_set
end

#|(other) ⇒ Object 



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# File 'lib/antlr4ruby/misc/range_set.rb', line 78

def | (other)
  self + other
end