Class: Irc::NetmaskDb::Tree

Inherits:
Object show all
Defined in:
lib/rbot/maskdb.rb

Overview

helper backend class: generic nested radix tree

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(pre = '', chi = Hash.new) ⇒ Tree

Returns a new instance of Tree.



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# File 'lib/rbot/maskdb.rb', line 7

def initialize(pre = '', chi = Hash.new)
  @pre = pre
  @chi = chi
end

Instance Attribute Details

#chi ⇒ Object (readonly)

Returns the value of attribute chi.



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# File 'lib/rbot/maskdb.rb', line 5

def chi
  @chi
end

#pre ⇒ Object (readonly)

Returns the value of attribute pre.



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# File 'lib/rbot/maskdb.rb', line 5

def pre
  @pre
end

Instance Method Details

#add(val, *prefs) ⇒ Object 



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# File 'lib/rbot/maskdb.rb', line 12

def add(val, *prefs)
  str = prefs.shift or raise 'empty prefs'
  @pre = str.dup if @chi.empty?

  n = 0
  @pre.size.times do
    break if @pre[n] != str[n]
    n += 1
  end

  rest = str.slice(n .. -1)

  if n != @pre.size
    prest = @pre.slice!(n .. -1)
    pc = prest.slice! 0
    @chi = {pc => Tree.new(prest, @chi)}
  end

  c = rest.slice!(0)

  if c
    (@chi[c] ||= Tree.new).add(val, rest, *prefs)
  else
    if prefs.empty?
      (@chi[''] ||= Array.new).push val
    else
      (@chi[''] ||= Tree.new).add(val, *prefs)
    end
  end
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rbot/maskdb.rb', line 43

def empty?
  @chi.empty?
end

#find(*prefs) ⇒ Object 



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# File 'lib/rbot/maskdb.rb', line 71

def find(*prefs)
  str = prefs.shift or raise 'empty prefs?'
  self.find_helper(str, *prefs) + self.find_helper(str.reverse, *prefs)
end

#remove(*prefs, &block) ⇒ Object 



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# File 'lib/rbot/maskdb.rb', line 47

def remove(*prefs, &block)
  str = prefs.shift or raise 'empty prefs?'
  return nil unless @pre.empty? or str.index(@pre) == 0
  c = str.slice(@pre.size) || ''
  return nil unless @chi.include? c
  if c == ''
    if prefs.empty?
      @chi[c].reject!(&block)
    else
      @chi[c].remove(*prefs, &block)
    end
  else
    @chi[c].remove(str.slice((@pre.size + 1) .. -1), *prefs, &block)
  end
  @chi.delete(c) if @chi[c].empty?

  if @chi.size == 1
    k = @chi.keys.shift
    return nil if k == ''
    @pre << k << @chi[k].pre
    @chi = @chi[k].chi
  end
end