From c1f9b1f7b1b77776192048005dcc66dcf3df2bfb Mon Sep 17 00:00:00 2001
From: Pierre Schmitz <pierre@archlinux.de>
Date: Sat, 27 Dec 2014 15:41:37 +0100
Subject: Update to MediaWiki 1.24.1

---
 includes/utils/ArrayUtils.php | 187 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 187 insertions(+)
 create mode 100644 includes/utils/ArrayUtils.php

(limited to 'includes/utils/ArrayUtils.php')

diff --git a/includes/utils/ArrayUtils.php b/includes/utils/ArrayUtils.php
new file mode 100644
index 00000000..1e521cb8
--- /dev/null
+++ b/includes/utils/ArrayUtils.php
@@ -0,0 +1,187 @@
+<?php
+/**
+ * Methods to play with arrays.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+/**
+ * A collection of static methods to play with arrays.
+ *
+ * @since 1.21
+ */
+class ArrayUtils {
+	/**
+	 * Sort the given array in a pseudo-random order which depends only on the
+	 * given key and each element value. This is typically used for load
+	 * balancing between servers each with a local cache.
+	 *
+	 * Keys are preserved. The input array is modified in place.
+	 *
+	 * Note: Benchmarking on PHP 5.3 and 5.4 indicates that for small
+	 * strings, md5() is only 10% slower than hash('joaat',...) etc.,
+	 * since the function call overhead dominates. So there's not much
+	 * justification for breaking compatibility with installations
+	 * compiled with ./configure --disable-hash.
+	 *
+	 * @param array $array Array to sort
+	 * @param string $key
+	 * @param string $separator A separator used to delimit the array elements and the
+	 *     key. This can be chosen to provide backwards compatibility with
+	 *     various consistent hash implementations that existed before this
+	 *     function was introduced.
+	 */
+	public static function consistentHashSort( &$array, $key, $separator = "\000" ) {
+		$hashes = array();
+		foreach ( $array as $elt ) {
+			$hashes[$elt] = md5( $elt . $separator . $key );
+		}
+		uasort( $array, function ( $a, $b ) use ( $hashes ) {
+			return strcmp( $hashes[$a], $hashes[$b] );
+		} );
+	}
+
+	/**
+	 * Given an array of non-normalised probabilities, this function will select
+	 * an element and return the appropriate key
+	 *
+	 * @param array $weights
+	 * @return bool|int|string
+	 */
+	public static function pickRandom( $weights ) {
+		if ( !is_array( $weights ) || count( $weights ) == 0 ) {
+			return false;
+		}
+
+		$sum = array_sum( $weights );
+		if ( $sum == 0 ) {
+			# No loads on any of them
+			# In previous versions, this triggered an unweighted random selection,
+			# but this feature has been removed as of April 2006 to allow for strict
+			# separation of query groups.
+			return false;
+		}
+		$max = mt_getrandmax();
+		$rand = mt_rand( 0, $max ) / $max * $sum;
+
+		$sum = 0;
+		foreach ( $weights as $i => $w ) {
+			$sum += $w;
+			# Do not return keys if they have 0 weight.
+			# Note that the "all 0 weight" case is handed above
+			if ( $w > 0 && $sum >= $rand ) {
+				break;
+			}
+		}
+
+		return $i;
+	}
+
+	/**
+	 * Do a binary search, and return the index of the largest item that sorts
+	 * less than or equal to the target value.
+	 *
+	 * @since 1.23
+	 *
+	 * @param array $valueCallback A function to call to get the value with
+	 *     a given array index.
+	 * @param int $valueCount The number of items accessible via $valueCallback,
+	 *     indexed from 0 to $valueCount - 1
+	 * @param array $comparisonCallback A callback to compare two values, returning
+	 *     -1, 0 or 1 in the style of strcmp().
+	 * @param string $target The target value to find.
+	 *
+	 * @return int|bool The item index of the lower bound, or false if the target value
+	 *     sorts before all items.
+	 */
+	public static function findLowerBound( $valueCallback, $valueCount,
+		$comparisonCallback, $target
+	) {
+		if ( $valueCount === 0 ) {
+			return false;
+		}
+
+		$min = 0;
+		$max = $valueCount;
+		do {
+			$mid = $min + ( ( $max - $min ) >> 1 );
+			$item = call_user_func( $valueCallback, $mid );
+			$comparison = call_user_func( $comparisonCallback, $target, $item );
+			if ( $comparison > 0 ) {
+				$min = $mid;
+			} elseif ( $comparison == 0 ) {
+				$min = $mid;
+				break;
+			} else {
+				$max = $mid;
+			}
+		} while ( $min < $max - 1 );
+
+		if ( $min == 0 ) {
+			$item = call_user_func( $valueCallback, $min );
+			$comparison = call_user_func( $comparisonCallback, $target, $item );
+			if ( $comparison < 0 ) {
+				// Before the first item
+				return false;
+			}
+		}
+		return $min;
+	}
+
+	/**
+	 * Do array_diff_assoc() on multi-dimensional arrays.
+	 *
+	 * Note: empty arrays are removed.
+	 *
+	 * @since 1.23
+	 *
+	 * @param array $array1 The array to compare from
+	 * @param array $array2,... More arrays to compare against
+	 * @return array An array containing all the values from array1
+	 *               that are not present in any of the other arrays.
+	 */
+	public static function arrayDiffAssocRecursive( $array1 ) {
+		$arrays = func_get_args();
+		array_shift( $arrays );
+		$ret = array();
+
+		foreach ( $array1 as $key => $value ) {
+			if ( is_array( $value ) ) {
+				$args = array( $value );
+				foreach ( $arrays as $array ) {
+					if ( isset( $array[$key] ) ) {
+						$args[] = $array[$key];
+					}
+				}
+				$valueret = call_user_func_array( __METHOD__, $args );
+				if ( count( $valueret ) ) {
+					$ret[$key] = $valueret;
+				}
+			} else {
+				foreach ( $arrays as $array ) {
+					if ( isset( $array[$key] ) && $array[$key] === $value ) {
+						continue 2;
+					}
+				}
+				$ret[$key] = $value;
+			}
+		}
+
+		return $ret;
+	}
+}
-- 
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