class SyntaxSuggest::PriorityEngulfQueue

Keeps track of what elements are in the queue in priority and also ensures that when one element engulfs/covers/eats another that the larger element evicts the smaller element

Public Class Methods

new ()

Source

# File lib/syntax_suggest/priority_engulf_queue.rb, line 9
def initialize
  @queue = PriorityQueue.new
end

Public Instance Methods

empty? ()

Source

# File lib/syntax_suggest/priority_engulf_queue.rb, line 17
def empty?
  @queue.empty?
end

length ()

Source

# File lib/syntax_suggest/priority_engulf_queue.rb, line 21
def length
  @queue.length
end

peek ()

Source

# File lib/syntax_suggest/priority_engulf_queue.rb, line 25
def peek
  @queue.peek
end

pop ()

Source

# File lib/syntax_suggest/priority_engulf_queue.rb, line 29
def pop
  @queue.pop
end

push (block)

Source

# File lib/syntax_suggest/priority_engulf_queue.rb, line 33
def push(block)
  prune_engulf(block)
  @queue << block
  flush_deleted

  self
end

to_a ()

Source

# File lib/syntax_suggest/priority_engulf_queue.rb, line 13
def to_a
  @queue.to_a
end

Private Instance Methods

flush_deleted ()

Source

# File lib/syntax_suggest/priority_engulf_queue.rb, line 41
        def flush_deleted
  while @queue&.peek&.deleted?
    @queue.pop
  end
end

prune_engulf (block)

Source

# File lib/syntax_suggest/priority_engulf_queue.rb, line 47
        def prune_engulf(block)
  # If we're about to pop off the same block, we can skip deleting
  # things from the frontier this iteration since we'll get it
  # on the next iteration
  return if @queue.peek && (block <=> @queue.peek) == 1

  if block.starts_at != block.ends_at # A block of size 1 cannot engulf another
    @queue.to_a.each { |b|
      if b.starts_at >= block.starts_at && b.ends_at <= block.ends_at
        b.delete
        true
      end
    }
  end
end