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<?php
/**
* PHP 5
*
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright 2005-2011, Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright 2005-2011, Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @package Cake.Utility
* @since CakePHP(tm) v 1.2.0
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/

App::uses('String', 'Utility');

/**
* Library of array functions for manipulating and extracting data
* from arrays or 'sets' of data.
*
* `Set2` provides an improved interface and more consistent and
* predictable set of features over `Set`. While it lacks the spotty
* support for pseudo Xpath, its more fully feature dot notation provides
* the same utility.
*
* @package Cake.Utility
*/
class Set2 {

/**
* Get a single value specified by $path out of $data.
* Does not support the full dot notation feature set,
* but is faster for simple operations.
*
* @param array $data Array of data to operate on.
* @param string $path The path being searched for.
* @return mixed The value fetched from the array, or null.
*/
public static function get(array $data, $path) {
if (empty($data) || empty($path)) {
return null;
}
$parts = explode('.', $path);
while ($key = array_shift($parts)) {
if (isset($data[$key])) {
$data =& $data[$key];
} else {
return null;
}
}
return $data;
}

public static function extract(array $data, $path) {

}

public static function insert(array $data, $path, $values = null) {

}

public static function remove(array $data, $path) {

}

public static function combine(array $data, $keyPath, $valuePath = null) {

}

public static function contains(array $data, $needle) {

}

public static function check(array $data, $path) {

}

public static function filter(array $data) {

}

/**
* Collapses a multi-dimensional array into a single dimension, using a delimited array path for
* each array element's key, i.e. array(array('Foo' => array('Bar' => 'Far'))) becomes
* array('0.Foo.Bar' => 'Far').)
*
* @param array $data Array to flatten
* @param string $separator String used to separate array key elements in a path, defaults to '.'
* @return array
* @link http://book.cakephp.org/2.0/en/core-utility-libraries/set.html#Set::flatten
*/
public static function flatten(array $data, $separator = '.') {
$result = array();
$stack = array();
$path = null;

reset($data);
while (!empty($data)) {
$key = key($data);
$element = $data[$key];
unset($data[$key]);

if (is_array($element)) {
if (!empty($data)) {
$stack[] = array($data, $path);
}
$data = $element;
$path .= $key . $separator;
} else {
$result[$path . $key] = $element;
}

if (empty($data) && !empty($stack)) {
list($data, $path) = array_pop($stack);
}
}
return $result;
}

/**
* This function can be thought of as a hybrid between PHP's `array_merge` and `array_merge_recursive`.
*
* The difference between this method and the built-in ones, is that if an array key contains another array, then
* Set2::merge() will behave in a recursive fashion (unlike `array_merge`). But it will not act recursively for
* keys that contain scalar values (unlike `array_merge_recursive`).
*
* Note: This function will work with an unlimited amount of arguments and typecasts non-array parameters into arrays.
*
* @param array $data Array to be merged
* @param mixed $merge Array to merge with. The argument and all trailing arguments will be array cast when merged
* @return array Merged array
* @link http://book.cakephp.org/2.0/en/core-utility-libraries/set.html#Set::merge
*/
public static function merge(array $data, $merge) {
$args = func_get_args();
$return = current($args);

while (($arg = next($args)) !== false) {
foreach ((array)$arg as $key => $val) {
if (!empty($return[$key]) && is_array($return[$key]) && is_array($val)) {
$return[$key] = self::merge($return[$key], $val);
} elseif (is_int($key)) {
$return[] = $val;
} else {
$return[$key] = $val;
}
}
}
return $return;
}

/**
* Counts the dimensions of an array.
* Only considers the dimension of the first element in the array.
*
* If you have an un-even or hetrogenous array, consider using Set2::maxDimensions()
* to get the dimensions of the array.
*
* @param array $array Array to count dimensions on
* @return integer The number of dimensions in $data
* @link http://book.cakephp.org/2.0/en/core-utility-libraries/set.html#Set::countDim
*/
public static function dimensions(array $data) {
if (empty($data)) {
return 0;
}
reset($data);
$depth = 1;
while ($elem = array_shift($data)) {
if (is_array($elem)) {
$depth += 1;
$data =& $elem;
} else {
break;
}
}
return $depth;
}

/**
* Counts the dimensions of *all* array elements. Useful for finding the maximum
* number of dimensions in a mixed array.
*
* @param array $data Array to count dimensions on
* @return integer The maximum number of dimensions in $data
* @link http://book.cakephp.org/2.0/en/core-utility-libraries/set.html#Set::countDim
*/
public static function maxDimensions(array $data) {
$depth = array();
if (is_array($data) && reset($data) !== false) {
foreach ($data as $value) {
$depth[] = Set2::dimensions((array)$value) + 1;
}
}
return max($depth);
}

/**
* Map a callback across all elements in a set.
* Can be provided a path to only modify slices of the set.
*
*/
public static function map(array $data, $path, $function = null) {

}

public static function sort(array $data, $path, $dir) {

}

/**
* Computes the difference between two complex arrays.
* This method differs from the built-in array_diff() in that it will preserve keys
* and work on multi-dimensional arrays.
*
* @param mixed $data First value
* @param mixed $data2 Second value
* @return array Returns the key => value pairs that are not common in $data and $data2
* The expression for this function is ($data - $data2) + ($data2 - ($data - $data2))
* @link http://book.cakephp.org/2.0/en/core-utility-libraries/set.html#Set::diff
*/
public static function diff(array $data, $data2) {
if (empty($data)) {
return (array)$data2;
}
if (empty($data2)) {
return (array)$data;
}
$intersection = array_intersect_key($data, $data2);
while (($key = key($intersection)) !== null) {
if ($data[$key] == $data2[$key]) {
unset($data[$key]);
unset($data2[$key]);
}
next($intersection);
}
return $data + $data2;
}

public static function normalize(array $data, $assoc = true) {

}

}
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