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framework/base/Dictionary.php

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+<?php
+
+namespace yii\base;
+
+/**
+ * This file contains classes implementing Map feature.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2011 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+/**
+ * CMap implements a collection that takes key-value pairs.
+ *
+ * You can access, add or remove an item with a key by using
+ * {@link itemAt}, {@link add}, and {@link remove}.
+ * To get the number of the items in the map, use {@link getCount}.
+ * CMap can also be used like a regular array as follows,
+ * <pre>
+ * $map[$key]=$value; // add a key-value pair
+ * unset($map[$key]); // remove the value with the specified key
+ * if(isset($map[$key])) // if the map contains the key
+ * foreach($map as $key=>$value) // traverse the items in the map
+ * $n=count($map);  // returns the number of items in the map
+ * </pre>
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id: CMap.php 3153 2011-04-01 12:50:06Z qiang.xue $
+ * @package system.collections
+ * @since 1.0
+ */
+class Dictionary extends Component implements \IteratorAggregate, \ArrayAccess, \Countable
+{
+	/**
+	 * @var array internal data storage
+	 */
+	private $_d=array();
+	/**
+	 * @var boolean whether this list is read-only
+	 */
+	private $_r=false;
+
+	/**
+	 * Constructor.
+	 * Initializes the list with an array or an iterable object.
+	 * @param array $data the intial data. Default is null, meaning no initialization.
+	 * @param boolean $readOnly whether the list is read-only
+	 * @throws CException If data is not null and neither an array nor an iterator.
+	 */
+	public function __construct($data=null,$readOnly=false)
+	{
+		if($data!==null)
+			$this->copyFrom($data);
+		$this->setReadOnly($readOnly);
+	}
+
+	/**
+	 * @return boolean whether this map is read-only or not. Defaults to false.
+	 */
+	public function getReadOnly()
+	{
+		return $this->_r;
+	}
+
+	/**
+	 * @param boolean $value whether this list is read-only or not
+	 */
+	protected function setReadOnly($value)
+	{
+		$this->_r=$value;
+	}
+
+	/**
+	 * Returns an iterator for traversing the items in the list.
+	 * This method is required by the interface IteratorAggregate.
+	 * @return CMapIterator an iterator for traversing the items in the list.
+	 */
+	public function getIterator()
+	{
+		return new CMapIterator($this->_d);
+	}
+
+	/**
+	 * Returns the number of items in the map.
+	 * This method is required by Countable interface.
+	 * @return integer number of items in the map.
+	 */
+	public function count()
+	{
+		return $this->getCount();
+	}
+
+	/**
+	 * Returns the number of items in the map.
+	 * @return integer the number of items in the map
+	 */
+	public function getCount()
+	{
+		return count($this->_d);
+	}
+
+	/**
+	 * @return array the key list
+	 */
+	public function getKeys()
+	{
+		return array_keys($this->_d);
+	}
+
+	/**
+	 * Returns the item with the specified key.
+	 * This method is exactly the same as {@link offsetGet}.
+	 * @param mixed $key the key
+	 * @return mixed the element at the offset, null if no element is found at the offset
+	 */
+	public function itemAt($key)
+	{
+		if(isset($this->_d[$key]))
+			return $this->_d[$key];
+		else
+			return null;
+	}
+
+	/**
+	 * Adds an item into the map.
+	 * Note, if the specified key already exists, the old value will be overwritten.
+	 * @param mixed $key key
+	 * @param mixed $value value
+	 * @throws CException if the map is read-only
+	 */
+	public function add($key,$value)
+	{
+		if(!$this->_r)
+		{
+			if($key===null)
+				$this->_d[]=$value;
+			else
+				$this->_d[$key]=$value;
+		}
+		else
+			throw new CException(Yii::t('yii','The map is read only.'));
+	}
+
+	/**
+	 * Removes an item from the map by its key.
+	 * @param mixed $key the key of the item to be removed
+	 * @return mixed the removed value, null if no such key exists.
+	 * @throws CException if the map is read-only
+	 */
+	public function remove($key)
+	{
+		if(!$this->_r)
+		{
+			if(isset($this->_d[$key]))
+			{
+				$value=$this->_d[$key];
+				unset($this->_d[$key]);
+				return $value;
+			}
+			else
+			{
+				// it is possible the value is null, which is not detected by isset
+				unset($this->_d[$key]);
+				return null;
+			}
+		}
+		else
+			throw new CException(Yii::t('yii','The map is read only.'));
+	}
+
+	/**
+	 * Removes all items in the map.
+	 */
+	public function clear()
+	{
+		foreach(array_keys($this->_d) as $key)
+			$this->remove($key);
+	}
+
+	/**
+	 * @param mixed $key the key
+	 * @return boolean whether the map contains an item with the specified key
+	 */
+	public function contains($key)
+	{
+		return isset($this->_d[$key]) || array_key_exists($key,$this->_d);
+	}
+
+	/**
+	 * @return array the list of items in array
+	 */
+	public function toArray()
+	{
+		return $this->_d;
+	}
+
+	/**
+	 * Copies iterable data into the map.
+	 * Note, existing data in the map will be cleared first.
+	 * @param mixed $data the data to be copied from, must be an array or object implementing Traversable
+	 * @throws CException If data is neither an array nor an iterator.
+	 */
+	public function copyFrom($data)
+	{
+		if(is_array($data) || $data instanceof Traversable)
+		{
+			if($this->getCount()>0)
+				$this->clear();
+			if($data instanceof CMap)
+				$data=$data->_d;
+			foreach($data as $key=>$value)
+				$this->add($key,$value);
+		}
+		else if($data!==null)
+			throw new CException(Yii::t('yii','Map data must be an array or an object implementing Traversable.'));
+	}
+
+	/**
+	 * Merges iterable data into the map.
+	 *
+	 * Existing elements in the map will be overwritten if their keys are the same as those in the source.
+	 * If the merge is recursive, the following algorithm is performed:
+	 * <ul>
+	 * <li>the map data is saved as $a, and the source data is saved as $b;</li>
+	 * <li>if $a and $b both have an array indxed at the same string key, the arrays will be merged using this algorithm;</li>
+	 * <li>any integer-indexed elements in $b will be appended to $a and reindxed accordingly;</li>
+	 * <li>any string-indexed elements in $b will overwrite elements in $a with the same index;</li>
+	 * </ul>
+	 *
+	 * @param mixed $data the data to be merged with, must be an array or object implementing Traversable
+	 * @param boolean $recursive whether the merging should be recursive.
+	 *
+	 * @throws CException If data is neither an array nor an iterator.
+	 */
+	public function mergeWith($data,$recursive=true)
+	{
+		if(is_array($data) || $data instanceof Traversable)
+		{
+			if($data instanceof CMap)
+				$data=$data->_d;
+			if($recursive)
+			{
+				if($data instanceof Traversable)
+				{
+					$d=array();
+					foreach($data as $key=>$value)
+						$d[$key]=$value;
+					$this->_d=self::mergeArray($this->_d,$d);
+				}
+				else
+					$this->_d=self::mergeArray($this->_d,$data);
+			}
+			else
+			{
+				foreach($data as $key=>$value)
+					$this->add($key,$value);
+			}
+		}
+		else if($data!==null)
+			throw new CException(Yii::t('yii','Map data must be an array or an object implementing Traversable.'));
+	}
+
+	/**
+	 * Merges two arrays into one recursively.
+	 * If each array has an element with the same string key value, the latter
+	 * will overwrite the former (different from array_merge_recursive).
+	 * Recursive merging will be conducted if both arrays have an element of array
+	 * type and are having the same key.
+	 * For integer-keyed elements, the elements from the latter array will
+	 * be appended to the former array.
+	 * @param array $a array to be merged to
+	 * @param array $b array to be merged from
+	 * @return array the merged array (the original arrays are not changed.)
+	 * @see mergeWith
+	 */
+	public static function mergeArray($a,$b)
+	{
+		foreach($b as $k=>$v)
+		{
+			if(is_integer($k))
+				isset($a[$k]) ? $a[]=$v : $a[$k]=$v;
+			else if(is_array($v) && isset($a[$k]) && is_array($a[$k]))
+				$a[$k]=self::mergeArray($a[$k],$v);
+			else
+				$a[$k]=$v;
+		}
+		return $a;
+	}
+
+	/**
+	 * Returns whether there is an element at the specified offset.
+	 * This method is required by the interface ArrayAccess.
+	 * @param mixed $offset the offset to check on
+	 * @return boolean
+	 */
+	public function offsetExists($offset)
+	{
+		return $this->contains($offset);
+	}
+
+	/**
+	 * Returns the element at the specified offset.
+	 * This method is required by the interface ArrayAccess.
+	 * @param integer $offset the offset to retrieve element.
+	 * @return mixed the element at the offset, null if no element is found at the offset
+	 */
+	public function offsetGet($offset)
+	{
+		return $this->itemAt($offset);
+	}
+
+	/**
+	 * Sets the element at the specified offset.
+	 * This method is required by the interface ArrayAccess.
+	 * @param integer $offset the offset to set element
+	 * @param mixed $item the element value
+	 */
+	public function offsetSet($offset,$item)
+	{
+		$this->add($offset,$item);
+	}
+
+	/**
+	 * Unsets the element at the specified offset.
+	 * This method is required by the interface ArrayAccess.
+	 * @param mixed $offset the offset to unset element
+	 */
+	public function offsetUnset($offset)
+	{
+		$this->remove($offset);
+	}
+}

framework/base/DictionaryIterator.php

@@ -0,0 +1,97 @@
+<?php
+
+namespace yii\base;
+
+/**
+ * CMapIterator class file.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2011 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+/**
+ * CMapIterator implements an interator for {@link CMap}.
+ *
+ * It allows CMap to return a new iterator for traversing the items in the map.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id: CMapIterator.php 3186 2011-04-15 22:34:55Z alexander.makarow $
+ * @package system.collections
+ * @since 1.0
+ */
+class DictionaryIterator implements \Iterator
+{
+	/**
+	 * @var array the data to be iterated through
+	 */
+	private $_d;
+	/**
+	 * @var array list of keys in the map
+	 */
+	private $_keys;
+	/**
+	 * @var mixed current key
+	 */
+	private $_key;
+
+	/**
+	 * Constructor.
+	 * @param array $data the data to be iterated through
+	 */
+	public function __construct(&$data)
+	{
+		$this->_d=&$data;
+		$this->_keys=array_keys($data);
+		$this->_key=reset($this->_keys);
+	}
+
+	/**
+	 * Rewinds internal array pointer.
+	 * This method is required by the interface Iterator.
+	 */
+	public function rewind()
+	{
+		$this->_key=reset($this->_keys);
+	}
+
+	/**
+	 * Returns the key of the current array element.
+	 * This method is required by the interface Iterator.
+	 * @return mixed the key of the current array element
+	 */
+	public function key()
+	{
+		return $this->_key;
+	}
+
+	/**
+	 * Returns the current array element.
+	 * This method is required by the interface Iterator.
+	 * @return mixed the current array element
+	 */
+	public function current()
+	{
+		return $this->_d[$this->_key];
+	}
+
+	/**
+	 * Moves the internal pointer to the next array element.
+	 * This method is required by the interface Iterator.
+	 */
+	public function next()
+	{
+		$this->_key=next($this->_keys);
+	}
+
+	/**
+	 * Returns whether there is an element at current position.
+	 * This method is required by the interface Iterator.
+	 * @return boolean
+	 */
+	public function valid()
+	{
+		return $this->_key!==false;
+	}
+}