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A General Purpose Tree Data Structure for Ruby
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steveholmes/RubyTree
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= rubytree __ _ _ /__\_ _| |__ _ _| |_ _ __ ___ ___ / \// | | | '_ \| | | | __| '__/ _ \/ _ \ / _ \ |_| | |_) | |_| | |_| | | __/ __/ \/ \_/\__,_|_.__/ \__, |\__|_| \___|\___| |___/ (c) 2006, 2007, 2008, 2009, 2010 Anupam Sengupta http://rubytree.rubyforge.org == DESCRIPTION: RubyTree is a Ruby implementation of the generic tree data structure. It provides a node-based model to store keyed node-elements in the tree and simple APIs to access, modify and traverse the structure. RubyTree is node-centric, where individual nodes on the tree are the primary compositional and structural elements. This implementation also mixes in the Enumerable module to allow standard access to the tree as a collection. == SYNOPSIS: As an example, the following code-snippet implements this tree structure: +------------+ | ROOT | +-----+------+ +-------------+------------+ | | +-------+-------+ +-------+-------+ | CHILD 1 | | CHILD 2 | +-------+-------+ +---------------+ | | +-------+-------+ | GRANDCHILD 1 | +---------------+ # ..... Example starts. require 'tree' # Load the library # ..... Create the root node first. Note that every node has a name and an optional content payload. myTreeRoot = Tree::TreeNode.new("ROOT", "Root Content") # ..... Now insert the child nodes. Note that you can "chain" the child insertions for a given path to any depth. myTreeRoot << Tree::TreeNode.new("CHILD1", "Child1 Content") << Tree::TreeNode.new("GRANDCHILD1", "GrandChild1 Content") myTreeRoot << Tree::TreeNode.new("CHILD2", "Child2 Content") # ..... Lets print the representation to stdout. This is primarily used for debugging purposes. myTreeRoot.printTree # ..... Lets directly access children and grandchildren of the root. The can be "chained" for a given path to any depth. child1 = myTreeRoot["CHILD1"] grandChild1 = myTreeRoot["CHILD1"]["GRANDCHILD1"] # ..... Now lets retrieve siblings of the current node as an array. siblingsOfChild1Array = child1.siblings # ..... Lets retrieve immediate children of the root node as an array. immediateChildrenArray = myTreeRoot.children # ..... This is a depth-first and L-to-R pre-ordered traversal. myTreeRoot.each { |node| node.content.reverse } # ..... Lets remove a child node from the root node. myTreeRoot.remove!(child1) == REQUIREMENTS: * Ruby 1.8+ (http://www.ruby-lang.org) * Hoe (http://seattlerb.rubyforge.org/hoe/Hoe.html) Rubygem * Optional but recommended: * structured_warnings (http://github.com/schmidt/structured_warnings) Rubygem == INSTALL: RubyTree is an open source project and is hosted at: http://rubytree.rubyforge.org RubyTree can be downloaded as a Rubygem or as a tar/zip file from: http://rubyforge.org/frs/?group_id=1215&release_id=8817 The file-name is one of: rubytree-<VERSION>.gem - The Rubygem rubytree-<VERSION>.tgz - GZipped source files rubytree-<VERSION>.zip - Zipped source files Download the appropriate file-type for your system. It is recommended to install RubyTree as a Ruby Gem, as this is an easy way to keep the version updated, and keep multiple versions of the library available on your system. === Installing the Gem To Install the Gem, from a Terminal/CLI command prompt, issue the command: $ gem install rubytree This should install the gem file for RubyTree. Note that you may need to be a super-user (root) to successfully install the gem. === Installing from the tgz/zip file Extract the archive file (tgz or zip) and run the following command from the top-level source directory: ruby ./setup.rb You may need administrator/super-user privileges to complete the setup using this method. == DOCUMENTATION: The primary class for this implementation is Tree::TreeNode. See the class documentation for an usage example. From a command line/terminal prompt, you can issue the following command to view the text mode ri documentation: ri Tree::TreeNode Documentation on the web is available at: http://rubytree.rubyforge.org/rdoc == DEVELOPERS: After checking out the source, run: $ rake newb This task will install any missing dependencies, run the tests/specs, and generate the RDoc. Note that you need to have the Rubygem 'Hoe' (http://seattlerb.rubyforge.org/hoe/Hoe.html) to successfully run the rake tasks. == LICENSE: RubyTree is licensed under the BSD[http://www.opensource.org/licenses/bsd-license.php] license. Copyright (c) 2006, 2007, 2008, 2009, 2010 Anupam Sengupta All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: - Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. - Neither the name of the organization nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. (Document Revision: $Revision$ by $Author$)
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