includes/api/ApiResult.php

   1 <?php
   2
   3 /**
   4  * Created on Sep 4, 2006
   5  *
   6  * API for MediaWiki 1.8+
   7  *
   8  * Copyright © 2006 Yuri Astrakhan <Firstname><Lastname>@gmail.com
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along
  21  * with this program; if not, write to the Free Software Foundation, Inc.,
  22  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  23  * http://www.gnu.org/copyleft/gpl.html
  24  */
  25
  26 if ( !defined( 'MEDIAWIKI' ) ) {
  27         // Eclipse helper - will be ignored in production
  28         require_once( 'ApiBase.php' );
  29 }
  30
  31 /**
  32  * This class represents the result of the API operations.
  33  * It simply wraps a nested array() structure, adding some functions to simplify array's modifications.
  34  * As various modules execute, they add different pieces of information to this result,
  35  * structuring it as it will be given to the client.
  36  *
  37  * Each subarray may either be a dictionary - key-value pairs with unique keys,
  38  * or lists, where the items are added using $data[] = $value notation.
  39  *
  40  * There are two special key values that change how XML output is generated:
  41  *   '_element' This key sets the tag name for the rest of the elements in the current array.
  42  *              It is only inserted if the formatter returned true for getNeedsRawData()
  43  *   '*'        This key has special meaning only to the XML formatter, and is outputed as is
  44  *                              for all others. In XML it becomes the content of the current element.
  45  *
  46  * @ingroup API
  47  */
  48 class ApiResult extends ApiBase {
  49
  50         private $mData, $mIsRawMode, $mSize, $mCheckingSize;
  51
  52         /**
  53          * Constructor
  54          * @param $main ApiMain object
  55          */
  56         public function __construct( $main ) {
  57                 parent::__construct( $main, 'result' );
  58                 $this->mIsRawMode = false;
  59                 $this->mCheckingSize = true;
  60                 $this->reset();
  61         }
  62
  63         /**
  64          * Clear the current result data.
  65          */
  66         public function reset() {
  67                 $this->mData = array();
  68                 $this->mSize = 0;
  69         }
  70
  71         /**
  72          * Call this function when special elements such as '_element'
  73          * are needed by the formatter, for example in XML printing.
  74          */
  75         public function setRawMode() {
  76                 $this->mIsRawMode = true;
  77         }
  78
  79         /**
  80          * Returns true whether the formatter requested raw data.
  81          * @return bool
  82          */
  83         public function getIsRawMode() {
  84                 return $this->mIsRawMode;
  85         }
  86
  87         /**
  88          * Get the result's internal data array (read-only)
  89          * @return array
  90          */
  91         public function getData() {
  92                 return $this->mData;
  93         }
  94
  95         /**
  96          * Get the 'real' size of a result item. This means the strlen() of the item,
  97          * or the sum of the strlen()s of the elements if the item is an array.
  98          * @param $value mixed
  99          * @return int
 100          */
 101         public static function size( $value ) {
 102                 $s = 0;
 103                 if ( is_array( $value ) ) {
 104                         foreach ( $value as $v ) {
 105                                 $s += self::size( $v );
 106                         }
 107                 } elseif ( !is_object( $value ) ) {
 108                         // Objects can't always be cast to string
 109                         $s = strlen( $value );
 110                 }
 111                 return $s;
 112         }
 113
 114         /**
 115          * Get the size of the result, i.e. the amount of bytes in it
 116          * @return int
 117          */
 118         public function getSize() {
 119                 return $this->mSize;
 120         }
 121
 122         /**
 123          * Disable size checking in addValue(). Don't use this unless you
 124          * REALLY know what you're doing. Values added while size checking
 125          * was disabled will not be counted (ever)
 126          */
 127         public function disableSizeCheck() {
 128                 $this->mCheckingSize = false;
 129         }
 130
 131         /**
 132          * Re-enable size checking in addValue()
 133          */
 134         public function enableSizeCheck() {
 135                 $this->mCheckingSize = true;
 136         }
 137
 138         /**
 139          * Add an output value to the array by name.
 140          * Verifies that value with the same name has not been added before.
 141          * @param $arr array to add $value to
 142          * @param $name string Index of $arr to add $value at
 143          * @param $value mixed
 144          */
 145         public static function setElement( &$arr, $name, $value ) {
 146                 if ( $arr === null || $name === null || $value === null || !is_array( $arr ) || is_array( $name ) ) {
 147                         ApiBase::dieDebug( __METHOD__, 'Bad parameter' );
 148                 }
 149
 150                 if ( !isset ( $arr[$name] ) ) {
 151                         $arr[$name] = $value;
 152                 } elseif ( is_array( $arr[$name] ) && is_array( $value ) ) {
 153                         $merged = array_intersect_key( $arr[$name], $value );
 154                         if ( !count( $merged ) ) {
 155                                 $arr[$name] += $value;
 156                         } else {
 157                                 ApiBase::dieDebug( __METHOD__, "Attempting to merge element $name" );
 158                         }
 159                 } else {
 160                         ApiBase::dieDebug( __METHOD__, "Attempting to add element $name=$value, existing value is {$arr[$name]}" );
 161                 }
 162         }
 163
 164         /**
 165          * Adds a content element to an array.
 166          * Use this function instead of hardcoding the '*' element.
 167          * @param $arr array to add the content element to
 168          * @param $value Mixed
 169          * @param $subElemName string when present, content element is created
 170          *  as a sub item of $arr. Use this parameter to create elements in
 171          *  format <elem>text</elem> without attributes
 172          */
 173         public static function setContent( &$arr, $value, $subElemName = null ) {
 174                 if ( is_array( $value ) ) {
 175                         ApiBase::dieDebug( __METHOD__, 'Bad parameter' );
 176                 }
 177                 if ( is_null( $subElemName ) ) {
 178                         ApiResult::setElement( $arr, '*', $value );
 179                 } else {
 180                         if ( !isset( $arr[$subElemName] ) ) {
 181                                 $arr[$subElemName] = array();
 182                         }
 183                         ApiResult::setElement( $arr[$subElemName], '*', $value );
 184                 }
 185         }
 186
 187         /**
 188          * In case the array contains indexed values (in addition to named),
 189          * give all indexed values the given tag name. This function MUST be
 190          * called on every arrray that has numerical indexes.
 191          * @param $arr array
 192          * @param $tag string Tag name
 193          */
 194         public function setIndexedTagName( &$arr, $tag ) {
 195                 // In raw mode, add the '_element', otherwise just ignore
 196                 if ( !$this->getIsRawMode() ) {
 197                         return;
 198                 }
 199                 if ( $arr === null || $tag === null || !is_array( $arr ) || is_array( $tag ) )
 200                 {
 201                         ApiBase::dieDebug( __METHOD__, 'Bad parameter' );
 202                 }
 203                 // Do not use setElement() as it is ok to call this more than once
 204                 $arr['_element'] = $tag;
 205         }
 206
 207         /**
 208          * Calls setIndexedTagName() on each sub-array of $arr
 209          * @param $arr array
 210          * @param $tag string Tag name
 211          */
 212         public function setIndexedTagName_recursive( &$arr, $tag ) {
 213                 if ( !is_array( $arr ) ) {
 214                         return;
 215                 }
 216                 foreach ( $arr as &$a ) {
 217                         if ( !is_array( $a ) ) {
 218                                 continue;
 219                         }
 220                         $this->setIndexedTagName( $a, $tag );
 221                         $this->setIndexedTagName_recursive( $a, $tag );
 222                 }
 223         }
 224
 225         /**
 226          * Calls setIndexedTagName() on an array already in the result.
 227          * Don't specify a path to a value that's not in the result, or
 228          * you'll get nasty errors.
 229          * @param $path array Path to the array, like addValue()'s $path
 230          * @param $tag string
 231          */
 232         public function setIndexedTagName_internal( $path, $tag ) {
 233                 $data = &$this->mData;
 234                 foreach ( (array)$path as $p ) {
 235                         if ( !isset( $data[$p] ) ) {
 236                                 $data[$p] = array();
 237                         }
 238                         $data = &$data[$p];
 239                 }
 240                 if ( is_null( $data ) ) {
 241                         return;
 242                 }
 243                 $this->setIndexedTagName( $data, $tag );
 244         }
 245
 246         /**
 247          * Add value to the output data at the given path.
 248          * Path is an indexed array, each element specifing the branch at which to add the new value
 249          * Setting $path to array('a','b','c') is equivalent to data['a']['b']['c'] = $value
 250          * If $name is empty, the $value is added as a next list element data[] = $value
 251          * @return bool True if $value fits in the result, false if not
 252          */
 253         public function addValue( $path, $name, $value ) {
 254                 global $wgAPIMaxResultSize;
 255                 $data = &$this->mData;
 256                 if ( $this->mCheckingSize ) {
 257                         $newsize = $this->mSize + self::size( $value );
 258                         if ( $newsize > $wgAPIMaxResultSize ) {
 259                                 return false;
 260                         }
 261                         $this->mSize = $newsize;
 262                 }
 263
 264                 if ( !is_null( $path ) ) {
 265                         if ( is_array( $path ) ) {
 266                                 foreach ( $path as $p ) {
 267                                         if ( !isset( $data[$p] ) ) {
 268                                                 $data[$p] = array();
 269                                         }
 270                                         $data = &$data[$p];
 271                                 }
 272                         } else {
 273                                 if ( !isset( $data[$path] ) ) {
 274                                         $data[$path] = array();
 275                                 }
 276                                 $data = &$data[$path];
 277                         }
 278                 }
 279
 280                 if ( !$name ) {
 281                         $data[] = $value; // Add list element
 282                 } else {
 283                         ApiResult::setElement( $data, $name, $value ); // Add named element
 284                 }
 285                 return true;
 286         }
 287
 288         /**
 289          * Unset a value previously added to the result set.
 290          * Fails silently if the value isn't found.
 291          * For parameters, see addValue()
 292          * @param $path array
 293          * @param $name string
 294          */
 295         public function unsetValue( $path, $name ) {
 296                 $data = &$this->mData;
 297                 if ( !is_null( $path ) ) {
 298                         foreach ( (array)$path as $p ) {
 299                                 if ( !isset( $data[$p] ) ) {
 300                                         return;
 301                                 }
 302                                 $data = &$data[$p];
 303                         }
 304                 }
 305                 $this->mSize -= self::size( $data[$name] );
 306                 unset( $data[$name] );
 307         }
 308
 309         /**
 310          * Ensure all values in this result are valid UTF-8.
 311          */
 312         public function cleanUpUTF8() {
 313                 array_walk_recursive( $this->mData, array( 'ApiResult', 'cleanUp_helper' ) );
 314         }
 315
 316         /**
 317          * Callback function for cleanUpUTF8()
 318          */
 319         private static function cleanUp_helper( &$s ) {
 320                 if ( !is_string( $s ) ) {
 321                         return;
 322                 }
 323                 global $wgContLang;
 324                 $s = $wgContLang->normalize( $s );
 325         }
 326
 327         public function execute() {
 328                 ApiBase::dieDebug( __METHOD__, 'execute() is not supported on Result object' );
 329         }
 330
 331         public function getVersion() {
 332                 return __CLASS__ . ': $Id$';
 333         }
 334 }