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<?php |
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namespace Ptypes; |
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use Ptypes\TreeNode; |
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use Ptypes\Exceptions\UnexpectedType; |
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use Ptypes\Exceptions\InvalidArgument; |
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class BinaryTree |
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{ |
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public const IN_ORDER = 0; |
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public const PRE_ORDER = 1; |
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public const POST_ORDER = 2; |
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public $root; |
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public function __construct($root=null) |
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{ |
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$this->root = $root; |
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} |
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public function insert($node) //$node is a treenode |
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{ |
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$this->validate_parameter($node); |
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if($this->root == null) |
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{ |
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$this->root = $node; |
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return $this; |
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} |
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$n = $this->root; |
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while(1) |
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{ |
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if($node->value < $n->value) |
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{ |
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if($n->left == null) |
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{ |
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$n->left = $node; |
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return $this; |
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} |
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$n = $n->left; |
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} |
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else if($node->value > $n->value) |
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{ |
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if($n->right == null) |
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{ |
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$n->right = $node; |
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return $this; |
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} |
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$n = $n->right; |
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} |
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else if($node->value == $n->value) //node is already in the tree, we do not create duplicates! |
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{ |
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return $this; |
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} |
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} |
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} |
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public function search($value) |
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{ |
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if(gettype($value) != "integer" && gettype($value) != "int" && gettype($value) != "double") |
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{ |
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throw new InvalidArgument("Expected a number, got: " . gettype($value) . " !\n"); |
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} |
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return $this->recursive_search($value, $this->root); |
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} |
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private function recursive_search($value, $node) |
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{ |
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if($node == null) |
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{ |
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return null; |
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} |
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$eval = $value - $node->value; |
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if($eval == 0) |
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{ |
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return $node; |
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} |
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if($eval < 0) |
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{ |
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return $this->recursive_search($value, $node->left); |
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} |
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else if($eval > 0) |
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{ |
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return $this->recursive_search($value, $node->right); |
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} |
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} |
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public function delete($value) |
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{ |
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//TODO |
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} |
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public function is_complete() |
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{ |
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//TODO |
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} |
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public function traverse($order) |
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{ |
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switch($order) |
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{ |
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case self::IN_ORDER: |
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$this->in_order_traversal($this->root); |
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break; |
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case self::PRE_ORDER: |
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//TODO |
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break; |
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case self::POST_ORDER: |
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//TODO |
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break; |
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default: |
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throw new InvalidArgument("Invalid order: " . $order . "! Valid orders: IN_ORDER (BinaryTree::IN_ORDER), PRE_ORDER (BinaryTree::PRE_ORDER), and POST_ORDER (BinaryTree::POST_ORDER).\n"); |
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} |
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} |
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private function in_order_traversal($node) |
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{ |
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//TODO RETURN ARRAY OF RESULTS |
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if ($node == null) |
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{ |
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return null; |
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} |
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$this->in_order_traversal($node->left); |
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echo $node->value . " "; |
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$this->in_order_traversal($node->right); |
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} |
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private function validate_parameter($node) |
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{ |
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if(gettype($node) != "object") |
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{ |
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throw new UnexpectedType("Expected a Ptypes\TreeNode, got: " . gettype($node)); |
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} |
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147
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148
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if(get_class($node) != "Ptypes\TreeNode") |
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{ |
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throw new UnexpectedType("Expected a Ptypes\TreeNode, got: " . get_class($node)); |
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151
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} |
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} |
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} |
HOWZ1T /
Ptypes
This check looks for parameters that have been defined for a function or method, but which are not used in the method body.