set.php

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<?php
/* SVN FILE: $Id: set.php 8210 2009-07-01 22:25:22Z jperras $ */
/**
 * Library of array functions for Cake.
 *
 * PHP versions 4 and 5
 *
 * CakePHP(tm) :  Rapid Development Framework (http://www.cakephp.org)
 * Copyright 2005-2008, Cake Software Foundation, Inc. (http://www.cakefoundation.org)
 *
 * Licensed under The MIT License
 * Redistributions of files must retain the above copyright notice.
 *
 * @filesource
 * @copyright     Copyright 2005-2008, Cake Software Foundation, Inc. (http://www.cakefoundation.org)
 * @link          http://www.cakefoundation.org/projects/info/cakephp CakePHP(tm) Project
 * @package       cake
 * @subpackage    cake.cake.libs
 * @since         CakePHP(tm) v 1.2.0
 * @version       $Revision: 8210 $
 * @modifiedby    $LastChangedBy: jperras $
 * @lastmodified  $Date: 2009-07-01 18:25:22 -0400 (Wed, 01 Jul 2009) $
 * @license       http://www.opensource.org/licenses/mit-license.php The MIT License
 */
/**
 * Class used for manipulation of arrays.
 *
 * Long description for class
 *
 * @package       cake
 * @subpackage    cake.cake.libs
 */
class Set extends Object {
/**
 * Deprecated
 *
 */
    var $value = array();
/**
 * This function can be thought of as a hybrid between PHP's array_merge and array_merge_recursive. The difference
 * to the two is that if an array key contains another array then the function behaves recursive (unlike array_merge)
 * but does not do if for keys containing strings (unlike array_merge_recursive). See the unit test for more information.
 *
 * Note: This function will work with an unlimited amount of arguments and typecasts non-array parameters into arrays.
 *
 * @param array $arr1 Array to be merged
 * @param array $arr2 Array to merge with
 * @return array Merged array
 * @access public
 * @static
 */
    function merge($arr1, $arr2 = null) {
        $args = func_get_args();

        $r = (array)current($args);
        while (($arg = next($args)) !== false) {
            foreach ((array)$arg as $key => $val)    {
                if (is_array($val) && isset($r[$key]) && is_array($r[$key])) {
                    $r[$key] = Set::merge($r[$key], $val);
                } elseif (is_int($key)) {
                    $r[] = $val;
                } else {
                    $r[$key] = $val;
                }
            }
        }
        return $r;
    }
/**
 * Filters empty elements out of a route array, excluding '0'.
 *
 * @param mixed $var Either an array to filter, or value when in callback
 * @param boolean $isArray Force to tell $var is an array when $var is empty
 * @return mixed Either filtered array, or true/false when in callback
 * @access public
 * @static
 */
    function filter($var, $isArray = false) {
        if (is_array($var) && (!empty($var) || $isArray)) {
            return array_filter($var, array('Set', 'filter'));
        }

        if ($var === 0 || $var === '0' || !empty($var)) {
            return true;
        }
        return false;
    }
/**
 * Pushes the differences in $array2 onto the end of $array
 *
 * @param mixed $array Original array
 * @param mixed $array2 Differences to push
 * @return array Combined array
 * @access public
 * @static
 */
    function pushDiff($array, $array2) {
        if (empty($array) && !empty($array2)) {
            return $array2;
        }
        if (!empty($array) && !empty($array2)) {
            foreach ($array2 as $key => $value) {
                if (!array_key_exists($key, $array)) {
                    $array[$key] = $value;
                } else {
                    if (is_array($value)) {
                        $array[$key] = Set::pushDiff($array[$key], $array2[$key]);
                    }
                }
            }
        }
        return $array;
    }
/**
 * Maps the contents of the Set object to an object hierarchy.
 * Maintains numeric keys as arrays of objects
 *
 * @param string $class A class name of the type of object to map to
 * @param string $tmp A temporary class name used as $class if $class is an array
 * @return object Hierarchical object
 * @access public
 * @static
 */
    function map($class = 'stdClass', $tmp = 'stdClass') {
        if (is_array($class)) {
            $val = $class;
            $class = $tmp;
        }

        if (empty($val)) {
            return null;
        }
        return Set::__map($val, $class);
    }

/**
 * Get the array value of $array. If $array is null, it will return
 * the current array Set holds. If it is an object of type Set, it
 * will return its value. If it is another object, its object variables.
 * If it is anything else but an array, it will return an array whose first
 * element is $array.
 *
 * @param mixed $array Data from where to get the array.
 * @return array Array from $array.
 * @access private
 */
    function __array($array) {
        if (empty($array)) {
            $array = array();
        } elseif (is_object($array)) {
            $array = get_object_vars($array);
        } elseif (!is_array($array)) {
            $array = array($array);
        }
        return $array;
    }

/**
 * Maps the given value as an object. If $value is an object,
 * it returns $value. Otherwise it maps $value as an object of
 * type $class, and if primary assign _name_ $key on first array.
 * If $value is not empty, it will be used to set properties of
 * returned object (recursively). If $key is numeric will maintain array
 * structure
 *
 * @param mixed $value Value to map
 * @param string $class Class name
 * @param boolean $primary whether to assign first array key as the _name_
 * @return mixed Mapped object
 * @access private
 * @static
 */
    function __map(&$array, $class, $primary = false) {
        if ($class === true) {
            $out = new stdClass;
        } else {
            $out = new $class;
        }
        if (is_array($array)) {
            $keys = array_keys($array);
            foreach ($array as $key => $value) {
                if ($keys[0] === $key && $class !== true) {
                    $primary = true;
                }
                if (is_numeric($key)) {
                    if (is_object($out)) {
                        $out = get_object_vars($out);
                    }
                    $out[$key] = Set::__map($value, $class);
                    if (is_object($out[$key])) {
                        if ($primary !== true && is_array($value) && Set::countDim($value, true) === 2) {
                            if (!isset($out[$key]->_name_)) {
                                $out[$key]->_name_ = $primary;
                            }
                        }
                    }
                } elseif (is_array($value)) {
                    if ($primary === true) {
                        if (!isset($out->_name_)) {
                            $out->_name_ = $key;
                        }
                        $primary = false;
                        foreach ($value as $key2 => $value2) {
                            $out->{$key2} = Set::__map($value2, true);
                        }
                    } else {
                        if (!is_numeric($key)) {
                            $out->{$key} = Set::__map($value, true, $key);
                            if (is_object($out->{$key}) && !is_numeric($key)) {
                                if (!isset($out->{$key}->_name_)) {
                                    $out->{$key}->_name_ = $key;
                                }
                            }
                        } else {
                            $out->{$key} = Set::__map($value, true);
                        }
                    }
                } else {
                    $out->{$key} = $value;
                }
            }
        } else {
            $out = $array;
        }
        return $out;
    }
/**
 * Checks to see if all the values in the array are numeric
 *
 * @param array $array The array to check.  If null, the value of the current Set object
 * @return boolean true if values are numeric, false otherwise
 * @access public
 * @static
 */
    function numeric($array = null) {
        if (empty($array)) {
            return null;
        }

        if ($array === range(0, count($array) - 1)) {
            return true;
        }

        $numeric = true;
        $keys = array_keys($array);
        $count = count($keys);

        for ($i = 0; $i < $count; $i++) {
            if (!is_numeric($array[$keys[$i]])) {
                $numeric = false;
                break;
            }
        }
        return $numeric;
    }
/**
 * Return a value from an array list if the key exists.
 *
 * If a comma separated $list is passed arrays are numeric with the key of the first being 0
 * $list = 'no, yes' would translate to  $list = array(0 => 'no', 1 => 'yes');
 *
 * If an array is used, keys can be strings example: array('no' => 0, 'yes' => 1);
 *
 * $list defaults to 0 = no 1 = yes if param is not passed
 *
 * @param mixed $select Key in $list to return
 * @param mixed $list can be an array or a comma-separated list.
 * @return string the value of the array key or null if no match
 * @access public
 * @static
 */
    function enum($select, $list = null) {
        if (empty($list)) {
            $list = array('no', 'yes');
        }

        $return = null;
        $list = Set::normalize($list, false);

        if (array_key_exists($select, $list)) {
            $return = $list[$select];
        }
        return $return;
    }
/**
 * Returns a series of values extracted from an array, formatted in a format string.
 *
 * @param array     $data Source array from which to extract the data
 * @param string    $format Format string into which values will be inserted, see sprintf()
 * @param array     $keys An array containing one or more Set::extract()-style key paths
 * @return array    An array of strings extracted from $keys and formatted with $format
 * @access public
 * @static
 */
    function format($data, $format, $keys) {

        $extracted = array();
        $count = count($keys);

        if (!$count) {
            return;
        }

        for ($i = 0; $i < $count; $i++) {
            $extracted[] = Set::extract($data, $keys[$i]);
        }
        $out = array();
        $data = $extracted;
        $count = count($data[0]);

        if (preg_match_all('/\{([0-9]+)\}/msi', $format, $keys2) && isset($keys2[1])) {
            $keys = $keys2[1];
            $format = preg_split('/\{([0-9]+)\}/msi', $format);
            $count2 = count($format);

            for ($j = 0; $j < $count; $j++) {
                $formatted = '';
                for ($i = 0; $i <= $count2; $i++) {
                    if (isset($format[$i])) {
                        $formatted .= $format[$i];
                    }
                    if (isset($keys[$i]) && isset($data[$keys[$i]][$j])) {
                        $formatted .= $data[$keys[$i]][$j];
                    }
                }
                $out[] = $formatted;
            }
        } else {
            $count2 = count($data);
            for ($j = 0; $j < $count; $j++) {
                $args = array();
                for ($i = 0; $i < $count2; $i++) {
                    if (isset($data[$i][$j])) {
                        $args[] = $data[$i][$j];
                    }
                }
                $out[] = vsprintf($format, $args);
            }
        }
        return $out;
    }
/**
 * Implements partial support for XPath 2.0. If $path is an array or $data is empty it the call is delegated to Set::classicExtract.
 *
 * Currently implemented selectors:
 * - /User/id (similar to the classic {n}.User.id)
 * - /User[2]/name (selects the name of the second User)
 * - /User[id>2] (selects all Users with an id > 2)
 * - /User[id>2][<5] (selects all Users with an id > 2 but < 5)
 * - /Post/Comment[author_name=john]/../name (Selects the name of all Posts that have at least one Comment written by john)
 * - /Posts[name] (Selects all Posts that have a 'name' key)
 * - /Comment/.[1] (Selects the contents of the first comment)
 * - /Comment/.[:last] (Selects the last comment)
 * - /Comment/.[:first] (Selects the first comment)
 * - /Comment[text=/cakephp/i] (Selects the all comments that have a text matching the regex /cakephp/i)
 * - /Comment/@* (Selects the all key names of all comments)
 *
 * Other limitations:
 * - Only absolute paths starting with a single '/' are supported right now
 *
 * Warning: Even so it has plenty of unit tests the XPath support has not gone through a lot of real-world testing. Please report
 * Bugs as you find them. Suggestions for additional features to imlement are also very welcome!
 *
 * @param string $path An absolute XPath 2.0 path
 * @param string $data An array of data to extract from
 * @param string $options Currently only supports 'flatten' which can be disabled for higher XPath-ness
 * @return array An array of matched items
 * @access public
 * @static
 */
    function extract($path, $data = null, $options = array()) {
        if (is_string($data)) {
            $tmp = $data;
            $data = $path;
            $path = $tmp;
        }
        if (strpos($path, '/') === false) {
            return Set::classicExtract($data, $path);
        }
        if (empty($data)) {
            return array();
        }
        if ($path === '/') {
            return $data;
        }
        $contexts = $data;
        $options = array_merge(array('flatten' => true), $options);
        if (!isset($contexts[0])) {
            $contexts = array($data);
        }
        $tokens = array_slice(preg_split('/(?<!=)\/(?![a-z-]*\])/', $path), 1);

        do {
            $token = array_shift($tokens);
            $conditions = false;
            if (preg_match_all('/\[([^=]+=\/[^\/]+\/|[^\]]+)\]/', $token, $m)) {
                $conditions = $m[1];
                $token = substr($token, 0, strpos($token, '['));
            }
            $matches = array();
            foreach ($contexts as $key => $context) {
                if (!isset($context['trace'])) {
                    $context = array('trace' => array(null), 'item' => $context, 'key' => $key);
                }
                if ($token === '..') {
                    if (count($context['trace']) == 1) {
                        $context['trace'][] = $context['key'];
                    }
                    $parent = join('/', $context['trace']) . '/.';
                    $context['item'] = Set::extract($parent, $data);
                    $context['key'] = array_pop($context['trace']);
                    if (isset($context['trace'][1]) && $context['trace'][1] > 0) {
                        $context['item'] = $context['item'][0];
                    } else if(!empty($context['item'][$key])){
                        $context['item'] = $context['item'][$key];
                    } else {
                        $context['item'] = array_shift($context['item']);
                    }
                    $matches[] = $context;
                    continue;
                }
                $match = false;
                if ($token === '@*' && is_array($context['item'])) {
                    $matches[] = array(
                        'trace' => array_merge($context['trace'], (array)$key),
                        'key' => $key,
                        'item' => array_keys($context['item']),
                    );
                } elseif (is_array($context['item']) && array_key_exists($token, $context['item'])) {
                    $items = $context['item'][$token];
                    if (!is_array($items)) {
                        $items = array($items);
                    } elseif (!isset($items[0])) {
                        $current = current($items);
                        if ((is_array($current) && count($items) <= 1) || !is_array($current)) {
                            $items = array($items);
                        }
                    }

                    foreach ($items as $key => $item) {
                        $ctext = array($context['key']);
                        if (!is_numeric($key)) {
                            $ctext[] = $token;
                            $token = array_shift($tokens);
                            if (isset($items[$token])) {
                                $ctext[] = $token;
                                $item = $items[$token];
                                $matches[] = array(
                                    'trace' => array_merge($context['trace'], $ctext),
                                    'key' => $key,
                                    'item' => $item,
                                );
                                break;
                            } else {
                                array_unshift($tokens, $token);
                            }
                        } else {
                            $key = $token;
                        }

                        $matches[] = array(
                            'trace' => array_merge($context['trace'], $ctext),
                            'key' => $key,
                            'item' => $item,
                        );
                    }
                } elseif (($key === $token || (ctype_digit($token) && $key == $token) || $token === '.')) {
                    $context['trace'][] = $key;
                    $matches[] = array(
                        'trace' => $context['trace'],
                        'key' => $key,
                        'item' => $context['item'],
                    );
                }
            }
            if ($conditions) {
                foreach ($conditions as $condition) {
                    $filtered = array();
                    $length = count($matches);
                    foreach ($matches as $i => $match) {
                        if (Set::matches(array($condition), $match['item'], $i + 1, $length)) {
                            $filtered[] = $match;
                        }
                    }
                    $matches = $filtered;
                }
            }
            $contexts = $matches;

            if (empty($tokens)) {
                break;
            }
        } while(1);

        $r = array();

        foreach ($matches as $match) {
            if ((!$options['flatten'] || is_array($match['item'])) && !is_int($match['key'])) {
                $r[] = array($match['key'] => $match['item']);
            } else {
                $r[] = $match['item'];
            }
        }
        return $r;
    }
/**
 * This function can be used to see if a single item or a given xpath match certain conditions.
 *
 * @param mixed $conditions An array of condition strings or an XPath expression
 * @param array $data  An array of data to execute the match on
 * @param integer $i Optional: The 'nth'-number of the item being matched.
 * @return boolean
 * @access public
 * @static
 */
    function matches($conditions, $data = array(), $i = null, $length = null) {
        if (empty($conditions)) {
            return true;
        }
        if (is_string($conditions)) {
            return !!Set::extract($conditions, $data);
        }
        foreach ($conditions as $condition) {
            if ($condition === ':last') {
                if ($i != $length) {
                    return false;
                }
                continue;
            } elseif ($condition === ':first') {
                if ($i != 1) {
                    return false;
                }
                continue;
            }
            if (!preg_match('/(.+?)([><!]?[=]|[><])(.*)/', $condition, $match)) {
                if (ctype_digit($condition)) {
                    if ($i != $condition) {
                        return false;
                    }
                } elseif (preg_match_all('/(?:^[0-9]+|(?<=,)[0-9]+)/', $condition, $matches)) {
                    return in_array($i, $matches[0]);
                } elseif (!array_key_exists($condition, $data)) {
                    return false;
                }
                continue;
            }
            list(,$key,$op,$expected) = $match;
            if (!isset($data[$key])) {
                return false;
            }

            $val = $data[$key];

            if ($op === '=' && $expected && $expected{0} === '/') {
                return preg_match($expected, $val);
            }
            if ($op === '=' && $val != $expected) {
                return false;
            }
            if ($op === '!=' && $val == $expected) {
                return false;
            }
            if ($op === '>' && $val <= $expected) {
                return false;
            }
            if ($op === '<' && $val >= $expected) {
                return false;
            }
            if ($op === '<=' && $val > $expected) {
                return false;
            }
            if ($op === '>=' && $val < $expected) {
                return false;
            }
        }
        return true;
    }
/**
 * Gets a value from an array or object that is contained in a given path using an array path syntax, i.e.:
 * "{n}.Person.{[a-z]+}" - Where "{n}" represents a numeric key, "Person" represents a string literal,
 * and "{[a-z]+}" (i.e. any string literal enclosed in brackets besides {n} and {s}) is interpreted as
 * a regular expression.
 *
 * @param array $data Array from where to extract
 * @param mixed $path As an array, or as a dot-separated string.
 * @return array Extracted data
 * @access public
 * @static
 */
    function classicExtract($data, $path = null) {
        if (empty($path)) {
            return $data;
        }
        if (is_object($data)) {
            $data = get_object_vars($data);
        }
        if (!is_array($data)) {
            return $data;
        }

        if (!is_array($path)) {
            if (!class_exists('String')) {
                App::import('Core', 'String');
            }
            $path = String::tokenize($path, '.', '{', '}');
        }
        $tmp = array();

        if (!is_array($path) || empty($path)) {
            return null;
        }

        foreach ($path as $i => $key) {
            if (is_numeric($key) && intval($key) > 0 || $key === '0') {
                if (isset($data[intval($key)])) {
                    $data = $data[intval($key)];
                } else {
                    return null;
                }
            } elseif ($key === '{n}') {
                foreach ($data as $j => $val) {
                    if (is_int($j)) {
                        $tmpPath = array_slice($path, $i + 1);
                        if (empty($tmpPath)) {
                            $tmp[] = $val;
                        } else {
                            $tmp[] = Set::classicExtract($val, $tmpPath);
                        }
                    }
                }
                return $tmp;
            } elseif ($key === '{s}') {
                foreach ($data as $j => $val) {
                    if (is_string($j)) {
                        $tmpPath = array_slice($path, $i + 1);
                        if (empty($tmpPath)) {
                            $tmp[] = $val;
                        } else {
                            $tmp[] = Set::classicExtract($val, $tmpPath);
                        }
                    }
                }
                return $tmp;
            } elseif (false !== strpos($key,'{') && false !== strpos($key,'}')) {
                $pattern = substr($key, 1, -1);

                foreach ($data as $j => $val) {
                    if (preg_match('/^'.$pattern.'/s', $j) !== 0) {
                        $tmpPath = array_slice($path, $i + 1);
                        if (empty($tmpPath)) {
                            $tmp[$j] = $val;
                        } else {
                            $tmp[$j] = Set::classicExtract($val, $tmpPath);
                        }
                    }
                }
                return $tmp;
            } else {
                if (isset($data[$key])) {
                    $data = $data[$key];
                } else {
                    return null;
                }
            }
        }
        return $data;
    }
/**
 * Inserts $data into an array as defined by $path.
 *
 * @param mixed $list Where to insert into
 * @param mixed $path A dot-separated string.
 * @param array $data Data to insert
 * @return array
 * @access public
 * @static
 */
    function insert($list, $path, $data = null) {
        if (!is_array($path)) {
            $path = explode('.', $path);
        }
        $_list =& $list;

        foreach ($path as $i => $key) {
            if (is_numeric($key) && intval($key) > 0 || $key === '0') {
                $key = intval($key);
            }
            if ($i === count($path) - 1) {
                $_list[$key] = $data;
            } else {
                if (!isset($_list[$key])) {
                    $_list[$key] = array();
                }
                $_list =& $_list[$key];
            }
        }
        return $list;
    }
/**
 * Removes an element from a Set or array as defined by $path.
 *
 * @param mixed $list From where to remove
 * @param mixed $path A dot-separated string.
 * @return array Array with $path removed from its value
 * @access public
 * @static
 */
    function remove($list, $path = null) {
        if (empty($path)) {
            return $list;
        }
        if (!is_array($path)) {
            $path = explode('.', $path);
        }
        $_list =& $list;

        foreach ($path as $i => $key) {
            if (is_numeric($key) && intval($key) > 0 || $key === '0') {
                $key = intval($key);
            }
            if ($i === count($path) - 1) {
                unset($_list[$key]);
            } else {
                if (!isset($_list[$key])) {
                    return $list;
                }
                $_list =& $_list[$key];
            }
        }
        return $list;
    }
/**
 * Checks if a particular path is set in an array
 *
 * @param mixed $data Data to check on
 * @param mixed $path A dot-separated string.
 * @return boolean true if path is found, false otherwise
 * @access public
 * @static
 */
    function check($data, $path = null) {
        if (empty($path)) {
            return $data;
        }
        if (!is_array($path)) {
            $path = explode('.', $path);
        }

        foreach ($path as $i => $key) {
            if (is_numeric($key) && intval($key) > 0 || $key === '0') {
                $key = intval($key);
            }
            if ($i === count($path) - 1) {
                return (is_array($data) && array_key_exists($key, $data));
            }

            if (!is_array($data) || !array_key_exists($key, $data)) {
                return false;
            }
            $data =& $data[$key];
        }
        return true;
    }
/**
 * Computes the difference between a Set and an array, two Sets, or two arrays
 *
 * @param mixed $val1 First value
 * @param mixed $val2 Second value
 * @return array Computed difference
 * @access public
 * @static
 */
    function diff($val1, $val2 = null) {
        if (empty($val1)) {
            return (array)$val2;
        }
        if (empty($val2)) {
            return (array)$val1;
        }
        $out = array();

        foreach ($val1 as $key => $val) {
            $exists = array_key_exists($key, $val2);

            if ($exists && $val2[$key] != $val) {
                $out[$key] = $val;
            } elseif (!$exists) {
                $out[$key] = $val;
            }
            unset($val2[$key]);
        }

        foreach ($val2 as $key => $val) {
            if (!array_key_exists($key, $out)) {
                $out[$key] = $val;
            }
        }
        return $out;
    }
/**
 * Determines if two Sets or arrays are equal
 *
 * @param array $val1 First value
 * @param array $val2 Second value
 * @return boolean true if they are equal, false otherwise
 * @access public
 * @static
 */
    function isEqual($val1, $val2 = null) {
        return ($val1 == $val2);
    }
/**
 * Determines if one Set or array contains the exact keys and values of another.
 *
 * @param array $val1 First value
 * @param array $val2 Second value
 * @return boolean true if $val1 contains $val2, false otherwise
 * @access public
 * @static
 */
    function contains($val1, $val2 = null) {
        if (empty($val1) || empty($val2)) {
            return false;
        }

        foreach ($val2 as $key => $val) {
            if (is_numeric($key)) {
                Set::contains($val, $val1);
            } else {
                if (!isset($val1[$key]) || $val1[$key] != $val) {
                    return false;
                }
            }
        }
        return true;
    }
/**
 * Counts the dimensions of an array. If $all is set to false (which is the default) it will
 * only consider the dimension of the first element in the array.
 *
 * @param array $array Array to count dimensions on
 * @param boolean $all Set to true to count the dimension considering all elements in array
 * @param integer $count Start the dimension count at this number
 * @return integer The number of dimensions in $array
 * @access public
 * @static
 */
    function countDim($array = null, $all = false, $count = 0) {
        if ($all) {
            $depth = array($count);
            if (is_array($array) && reset($array) !== false) {
                foreach ($array as $value) {
                    $depth[] = Set::countDim($value, true, $count + 1);
                }
            }
            $return = max($depth);
        } else {
            if (is_array(reset($array))) {
                $return = Set::countDim(reset($array)) + 1;
            } else {
                $return = 1;
            }
        }
        return $return;
    }
/**
 * Normalizes a string or array list.
 *
 * @param mixed $list List to normalize
 * @param boolean $assoc If true, $list will be converted to an associative array
 * @param string $sep If $list is a string, it will be split into an array with $sep
 * @param boolean $trim If true, separated strings will be trimmed
 * @return array
 * @access public
 * @static
 */
    function normalize($list, $assoc = true, $sep = ',', $trim = true) {
        if (is_string($list)) {
            $list = explode($sep, $list);
            if ($trim) {
                foreach ($list as $key => $value) {
                    $list[$key] = trim($value);
                }
            }
            if ($assoc) {
                return Set::normalize($list);
            }
        } elseif (is_array($list)) {
            $keys = array_keys($list);
            $count = count($keys);
            $numeric = true;

            if (!$assoc) {
                for ($i = 0; $i < $count; $i++) {
                    if (!is_int($keys[$i])) {
                        $numeric = false;
                        break;
                    }
                }
            }
            if (!$numeric || $assoc) {
                $newList = array();
                for ($i = 0; $i < $count; $i++) {
                    if (is_int($keys[$i])) {
                        $newList[$list[$keys[$i]]] = null;
                    } else {
                        $newList[$keys[$i]] = $list[$keys[$i]];
                    }
                }
                $list = $newList;
            }
        }
        return $list;
    }
/**
 * Creates an associative array using a $path1 as the path to build its keys, and optionally
 * $path2 as path to get the values. If $path2 is not specified, all values will be initialized
 * to null (useful for Set::merge). You can optionally group the values by what is obtained when
 * following the path specified in $groupPath.
 *
 * @param mixed $data Array or object from where to extract keys and values
 * @param mixed $path1 As an array, or as a dot-separated string.
 * @param mixed $path2 As an array, or as a dot-separated string.
 * @param string $groupPath As an array, or as a dot-separated string.
 * @return array Combined array
 * @access public
 * @static
 */
    function combine($data, $path1 = null, $path2 = null, $groupPath = null) {
        if (empty($data)) {
            return array();
        }

        if (is_object($data)) {
            $data = get_object_vars($data);
        }

        if (is_array($path1)) {
            $format = array_shift($path1);
            $keys = Set::format($data, $format, $path1);
        } else {
            $keys = Set::extract($data, $path1);
        }

        if (!empty($path2) && is_array($path2)) {
            $format = array_shift($path2);
            $vals = Set::format($data, $format, $path2);

        } elseif (!empty($path2)) {
            $vals = Set::extract($data, $path2);

        } else {
            $count = count($keys);
            for ($i = 0; $i < $count; $i++) {
                $vals[$i] = null;
            }
        }

        if ($groupPath != null) {
            $group = Set::extract($data, $groupPath);
            if (!empty($group)) {
                $c = count($keys);
                for ($i = 0; $i < $c; $i++) {
                    if (!isset($group[$i])) {
                        $group[$i] = 0;
                    }
                    if (!isset($out[$group[$i]])) {
                        $out[$group[$i]] = array();
                    }
                    $out[$group[$i]][$keys[$i]] = $vals[$i];
                }
                return $out;
            }
        }

        return array_combine($keys, $vals);
    }
/**
 * Converts an object into an array. If $object is no object, reverse
 * will return the same value.
 *
 * @param object $object Object to reverse
 * @return array
 * @static
 */
    function reverse($object) {
        $out = array();
        if (is_a($object, 'XmlNode')) {
            $out = $object->toArray();
            return $out;
        } else if (is_object($object)) {
            $keys = get_object_vars($object);
            if (isset($keys['_name_'])) {
                $identity = $keys['_name_'];
                unset($keys['_name_']);
            }
            $new = array();
            foreach ($keys as $key => $value) {
                if (is_array($value)) {
                    $new[$key] = (array)Set::reverse($value);
                } else {
                    if (isset($value->_name_)) {
                        $new = array_merge($new, Set::reverse($value));
                    } else {
                        $new[$key] = Set::reverse($value);
                    }
                }
            }
            if (isset($identity)) {
                $out[$identity] = $new;
            } else {
                $out = $new;
            }
        } elseif (is_array($object)) {
            foreach ($object as $key => $value) {
                $out[$key] = Set::reverse($value);
            }
        } else {
            $out = $object;
        }
        return $out;
    }
/**
 * 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 $separator String used to separate array key elements in a path, defaults to '.'
 * @return array
 * @access public
 * @static
 */
    function flatten($data, $separator = '.') {
        $result = array();
        $path = null;

        if (is_array($separator)) {
            extract($separator, EXTR_OVERWRITE);
        }

        if (!is_null($path)) {
            $path .= $separator;
        }

        foreach ($data as $key => $val) {
            if (is_array($val)) {
                $result += (array)Set::flatten($val, array(
                    'separator' => $separator,
                    'path' => $path . $key
                ));
            } else {
                $result[$path . $key] = $val;
            }
        }
        return $result;
    }
/**
 * Flattens an array for sorting
 *
 * @param array $results
 * @param string $key
 * @return array
 * @access private
 */
    function __flatten($results, $key = null) {
        $stack = array();
        foreach ($results as $k => $r) {
            $id = $k;
            if (!is_null($key)) {
                $id = $key;
            }
            if (is_array($r)) {
                $stack = array_merge($stack, Set::__flatten($r, $id));
            } else {
                $stack[] = array('id' => $id, 'value' => $r);
            }
        }
        return $stack;
    }
/**
 * Sorts an array by any value, determined by a Set-compatible path
 *
 * @param array $data
 * @param string $path A Set-compatible path to the array value
 * @param string $dir asc/desc
 * @return array
 * @static
 */
    function sort($data, $path, $dir) {
        $result = Set::__flatten(Set::extract($data, $path));
        list($keys, $values) = array(Set::extract($result, '{n}.id'), Set::extract($result, '{n}.value'));

        $dir = strtolower($dir);
        if ($dir === 'asc') {
            $dir = SORT_ASC;
        } elseif ($dir === 'desc') {
            $dir = SORT_DESC;
        }
        array_multisort($values, $dir, $keys, $dir);
        $sorted = array();

        $keys = array_unique($keys);

        foreach ($keys as $k) {
            $sorted[] = $data[$k];
        }
        return $sorted;
    }
/**
 * Deprecated, Set class should be called statically
 *
 */
    function &get() {
        trigger_error('get() is deprecated. Set class should be called statically', E_USER_WARNING);
    }
}
?>

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