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Description: A Ruby-based parsing DSL based on parsing expression grammars.
Homepage: http://treetop.rubyforge.org
Clone URL: git://github.com/juretta/treetop.git 
Randomized node heights and the beginnings of a test to drive out corner 
cases which seem to exist with duplicate markers returned from stabbing 
queries
Nathan Sobo (author)
Fri Jan 25 18:04:00 -0800 2008
commit  98df05870a656da0a9cd93431cc46223d3375d21
tree    0d438a93329ed7f5655f2943b08db54a757b275f
parent  1169099ff175559ecdea213cb2b285c502e11f2c
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lib/treetop/runtime/interval_skip_list/interval_skip_list.rb 
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@@ -1,7 +1,10 @@
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 class IntervalSkipList
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+  attr_reader :probability
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+
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   def initialize
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     @head = HeadNode.new(max_height)
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     @ranges = {}
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+    @probability = 0.5
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   end
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   def max_height
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@@ -144,7 +147,11 @@ class IntervalSkipList
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   end
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   def next_node_height
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-    nil
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+    height = 1
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+    while rand < probability && height < max_height
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+      height += 1
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+    end
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+    height
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   end
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   def can_ascend_from?(node, level)
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spec/runtime/interval_skip_list/expire_range_spec.rb 
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-require File.expand_path("#{File.dirname(__FILE__)}/../../spec_helper")
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 require File.expand_path("#{File.dirname(__FILE__)}/spec_helper")
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 describe IntervalSkipList do
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spec/runtime/interval_skip_list/spec_helper.rb 
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 require File.expand_path("#{File.dirname(__FILE__)}/../../spec_helper")
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 class IntervalSkipList
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-  public :insert_node, :delete_node, :nodes, :head
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+  public :insert_node, :delete_node, :nodes, :head, :next_node_height
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 end
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 describe "#next_node_height is deterministic", :shared => true do

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