Class: PrettyPrint::GroupQueue

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

Overview

The GroupQueue class is used for managing the queue of Group to be pretty printed.

This queue groups the Group objects, based on their depth.

This class is intended for internal use of the PrettyPrint buffers.

Instance Method Summary collapse

Constructor Details

#initialize(*groups) ⇒ GroupQueue

Create a GroupQueue object

Arguments:

  • groups - one or more PrettyPrint::Group objects


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# File 'lib/prettyprint.rb', line 445

def initialize(*groups)
  @queue = []
  groups.each {|g| enq g}
end

Instance Method Details

#delete(group) ⇒ Object

Remote group from this queue


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# File 'lib/prettyprint.rb', line 477

def delete(group)
  @queue[group.depth].delete(group)
end

#deqObject

Returns the outer group of the queue


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# File 'lib/prettyprint.rb', line 461

def deq
  @queue.each {|gs|
    (gs.length-1).downto(0) {|i|
      unless gs[i].breakables.empty?
        group = gs.slice!(i, 1).first
        group.break
        return group
      end
    }
    gs.each {|group| group.break}
    gs.clear
  }
  return nil
end

#enq(group) ⇒ Object

Enqueue group

This does not strictly append the group to the end of the queue, but instead adds it in line, base on the group.depth


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# File 'lib/prettyprint.rb', line 454

def enq(group)
  depth = group.depth
  @queue << [] until depth < @queue.length
  @queue[depth] << group
end