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annotate 1-Ruby/tree.rb @ 21:7e212cc7ec24

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Add default Tree code from book's source code
author IBBoard <dev@ibboard.co.uk>
date Sat, 07 Jan 2017 20:36:33 +0000
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children e020410896ca
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IBBoard <dev@ibboard.co.uk>
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1 #---
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2 # Excerpted from "Seven Languages in Seven Weeks",
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3 # published by The Pragmatic Bookshelf.
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4 # Copyrights apply to this code. It may not be used to create training material,
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5 # courses, books, articles, and the like. Contact us if you are in doubt.
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6 # We make no guarantees that this code is fit for any purpose.
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7 # Visit http://www.pragmaticprogrammer.com/titles/btlang for more book information.
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8 #---
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9 class Tree
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10 attr_accessor :children, :node_name
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11
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12 def initialize(name, children=[])
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13 @children = children
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14 @node_name = name
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15 end
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16
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17 def visit_all(&block)
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18 visit &block
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19 children.each {|c| c.visit_all &block}
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20 end
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21
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22 def visit(&block)
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23 block.call self
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24 end
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25 end
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26
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27 ruby_tree = Tree.new( "Ruby",
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28 [Tree.new("Reia"),
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29 Tree.new("MacRuby")] )
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30
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31 puts "Visiting a node"
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32 ruby_tree.visit {|node| puts node.node_name}
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33 puts
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34
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35 puts "visiting entire tree"
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36 ruby_tree.visit_all {|node| puts node.node_name}