From c4dd7a1a684490673e25aaf4fabec5df138854c4 Mon Sep 17 00:00:00 2001
From: Lorry Tar Creator <lorry-tar-importer@baserock.org>
Date: Thu, 14 Mar 2013 05:42:27 +0000
Subject: Imported from /home/lorry/working-area/delta_php2/php-5.4.13.tar.bz2.

---
 ext/spl/examples/dualiterator.inc | 210 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 210 insertions(+)
 create mode 100644 ext/spl/examples/dualiterator.inc

(limited to 'ext/spl/examples/dualiterator.inc')

diff --git a/ext/spl/examples/dualiterator.inc b/ext/spl/examples/dualiterator.inc
new file mode 100644
index 0000000..4cee203
--- /dev/null
+++ b/ext/spl/examples/dualiterator.inc
@@ -0,0 +1,210 @@
+<?php
+
+/** @file dualiterator.inc
+ * @ingroup Examples
+ * @brief class DualIterator
+ * @author  Marcus Boerger
+ * @date    2003 - 2006
+ *
+ * SPL - Standard PHP Library
+ */
+
+/** @ingroup Examples
+ * @brief   Synchronous iteration over two iterators
+ * @author  Marcus Boerger
+ * @version 1.3
+ */
+class DualIterator implements Iterator
+{
+	const CURRENT_LHS   = 0x01;
+	const CURRENT_RHS   = 0x02;
+	const CURRENT_ARRAY = 0x03;
+	const CURRENT_0     = 0x00;
+
+	const KEY_LHS   = 0x10;
+	const KEY_RHS   = 0x20;
+	const KEY_0     = 0x00;
+	
+	const DEFAULT_FLAGS = 0x13;
+	
+	private $lhs;
+	private $rhs;
+	private $flags;
+
+	/** construct iterator from two iterators
+	 *
+	 * @param lhs   Left  Hand Side Iterator
+	 * @param rhs   Right Hand Side Iterator
+	 * @param flags iteration flags
+	 */
+	function __construct(Iterator $lhs, Iterator $rhs, 
+					$flags = 0x13 /*DualIterator::DEFAULT_FLAGS*/)
+	{
+		$this->lhs   = $lhs;
+		$this->rhs   = $rhs;
+		$this->flags = $flags;
+	}
+
+	/** @return Left Hand Side Iterator
+	 */
+	function getLHS()
+	{
+		return $this->lhs;
+	}
+
+	/** @return Right Hand Side Iterator
+	 */
+	function getRHS()
+	{
+		return $this->rhs;
+	}
+
+	/** @param flags new flags
+	 */
+	function setFlags($flags)
+	{
+		$this->flags = $flags;
+	}
+
+	/** @return current flags
+	 */
+	function getFlags()
+	{
+		return $this->flags;
+	}
+
+	/** rewind both inner iterators
+	 */	
+	function rewind()
+	{
+		$this->lhs->rewind();
+		$this->rhs->rewind();	
+	}
+
+	/** @return whether both inner iterators are valid
+	 */	
+	function valid()
+	{
+		return $this->lhs->valid() && $this->rhs->valid();	
+	}
+
+	/** @return current value depending on CURRENT_* flags
+	 */	
+	function current()
+	{
+		switch($this->flags & 0x0F)
+		{
+		default:
+		case self::CURRENT_ARRAY:
+			return array($this->lhs->current(), $this->rhs->current());
+		case self::CURRENT_LHS:
+			return $this->lhs->current();
+		case self::CURRENT_RHS:
+			return $this->rhs->current();
+		case self::CURRENT_0:
+			return NULL;
+		}
+	}
+
+	/** @return key value depending on KEY_* flags
+	 */	
+	function key()
+	{
+		switch($this->flags & 0xF0)
+		{
+		default:
+		case self::KEY_LHS:
+			return $this->lhs->key();
+		case self::KEY_RHS:
+			return $this->rhs->key();
+		case self::KEY_0:
+			return NULL;
+		}
+	}
+
+	/** move both inner iterators forward
+	 */	
+	function next()
+	{
+		$this->lhs->next();
+		$this->rhs->next();
+	}
+
+	/** @return whether both inner iterators are valid and have identical 
+	 * current and key values or both are non valid.
+	 */
+	function areIdentical()
+	{
+		return $this->valid()
+		     ? $this->lhs->current() === $this->rhs->current()
+			&& $this->lhs->key()     === $this->rhs->key()
+			 : $this->lhs->valid()   ==  $this->rhs->valid();
+	}
+
+	/** @return whether both inner iterators are valid and have equal current 
+	 * and key values or both are non valid.
+	 */
+	function areEqual()
+	{
+		return $this->valid()
+		     ? $this->lhs->current() ==  $this->rhs->current()
+			&& $this->lhs->key()     ==  $this->rhs->key()
+			 : $this->lhs->valid()   ==  $this->rhs->valid();
+	}
+
+	/** Compare two iterators
+	 *
+	 * @param lhs   Left  Hand Side Iterator
+	 * @param rhs   Right Hand Side Iterator
+	 * @param identical whether to use areEqual() or areIdentical()
+	 * @return whether both iterators are equal/identical
+	 *
+	 * @note If one implements RecursiveIterator the other must do as well.
+	 *       And if both do then a recursive comparison is being used.
+	 */
+	static function compareIterators(Iterator $lhs, Iterator $rhs, 
+	                                 $identical = false)
+	{
+		if ($lhs instanceof RecursiveIterator)
+		{
+			if ($rhs instanceof RecursiveIterator)
+			{
+				$it = new RecursiveDualIterator($lhs, $rhs, 
+								self::CURRENT_0 | self::KEY_0);
+				$it = new RecursiveCompareDualIterator($it);
+			}
+			else
+			{
+				return false;
+			}
+		}
+		else
+		{
+			$it = new DualIterator($lhs, $rhs, self::CURRENT_0 | self::KEY_0);
+		}
+
+		if ($identical)
+		{
+			foreach($it as $n)
+			{
+				if (!$it->areIdentical())
+				{
+					return false;
+				}
+			}
+		}
+		else
+		{
+			foreach($it as $n)
+			{
+				if (!$it->areEqual())
+				{
+					return false;
+				}
+			}
+		}
+		return $identical ? $it->areIdentical() : $it->areEqual();
+	}
+}
+
+?>
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