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A General Purpose Tree Data Structure for Ruby
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README

= RubyTree
   __       _           _
   /__\_   _| |__  _   _| |_ _ __ ___  ___
  / \// | | | '_ \| | | | __| '__/ _ \/ _ \
 / _  \ |_| | |_) | |_| | |_| | |  __/  __/
 \/ \_/\__,_|_.__/ \__, |\__|_|  \___|\___|
                  |___/

Copyright (c) 2006, 2007, 2008, 2009, 2010, 2011 Anupam Sengupta (anupamsg at gmail dot com)

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.
 root_node = 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.
 root_node << Tree::TreeNode.new("CHILD1", "Child1 Content") << Tree::TreeNode.new("GRANDCHILD1", "GrandChild1 Content")
 root_node << Tree::TreeNode.new("CHILD2", "Child2 Content")

 # ..... Lets print the representation to stdout.  This is primarily used for debugging purposes.
 root_node.print_tree

 # ..... Lets directly access children and grandchildren of the root.  The can be "chained" for a given path to any depth.
 child1 = root_node["CHILD1"]
 grand_child1 = root_node["CHILD1"]["GRANDCHILD1"]

 # ..... Lets retrieve siblings of the current node as an array.
 siblings_of_child1 = child1.siblings

 # ..... Lets retrieve immediate children of the root node as an array.
 children_of_root = root_node.children

 # ..... This is a depth-first and L-to-R pre-ordered traversal.
 root_node.each { |node| node.content.reverse }

 # ..... Lets remove a child node from the root node.
 root_node.remove!(child1)


== REQUIREMENTS:

* Ruby 1.8+  (http://www.ruby-lang.org)

* Optional but recommended:
  * structured_warnings (http://github.com/schmidt/structured_warnings) Rubygem
  * Yard (http://yardoc.org) Rubygem for the documentation
  * JSON (http://flori.github.com/json) Rubygem for converting to/from the JSON format

* Development dependencies (not required for installing the gem):
  * Hoe (http://seattlerb.rubyforge.org/hoe/Hoe.html) Rubygem
  * gemcutter (http://gemcutter.org/gems/gemcutter) Rubygem
  * Rubyforge (http://codeforpeople.rubyforge.org/rubyforge) 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 for the latest released version is available at:

http://rubytree.rubyforge.org/rdoc

Documentation for the latest git HEAD is available at:

http://rdoc.info/projects/evolve75/RubyTree

Note that the documentation is formatted for Yard (http://yardoc.org).

== DEVELOPERS:

You can download the latest released source code using the tar or zip version as mentioned above in the installation
section.

Alternatively, you can checkout the latest commit/revision from the version control system.  Note that RubyTree's
primary SCM[http://en.wikipedia.org/wiki/Source_Code_Management] is on git[http://git-scm.com] and is
also mirrored on github[http://www.github.com].

=== Using the Git repository

For checking out from the primary Git repository, use the following command:

  $ git clone git://rubyforge.org/rubytree.git

The Git repository is available for browsing on the web at: http://fisheye2.atlassian.com/browse/rubytree

=== Using the Git repository on http://github.com

For cloning the git repository, use one of the following commands:

  $ git clone git://github.com/evolve75/RubyTree.git

or
  $ git clone http://github.com/evolve75/RubyTree.git

The git repository is available on the web at: http://github.com/evolve75/RubyTree

=== Setting up the development environment

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.  Installing Hoe may also install additional pre-requisite gems.  See the REQUIREMENTS section in this document for
details.

For generating the documentation, it is strongly suggested that the Yard[http://yardoc.org] gem be installed.

== ACKNOWLEDGMENTS:

I would like to acknowledge the following contributors for helping improve RubyTree:

1. Dirk Breuer (http://github.com/railsbros-dirk) for contributing the JSON conversion code.
2. Vincenzo Farruggia for contributing the (sub)tree cloning code.

== 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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