includes/Xml.php

   1 <?php
   2 /**
   3  * Methods to generate XML.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Module of static functions for generating XML
  25  */
  26 class Xml {
  27         /**
  28          * Format an XML element with given attributes and, optionally, text content.
  29          * Element and attribute names are assumed to be ready for literal inclusion.
  30          * Strings are assumed to not contain XML-illegal characters; special
  31          * characters (<, >, &) are escaped but illegals are not touched.
  32          *
  33          * @param $element String: element name
  34          * @param $attribs Array: Name=>value pairs. Values will be escaped.
  35          * @param $contents String: NULL to make an open tag only; '' for a contentless closed tag (default)
  36          * @param $allowShortTag Bool: whether '' in $contents will result in a contentless closed tag
  37          * @return string
  38          */
  39         public static function element( $element, $attribs = null, $contents = '', $allowShortTag = true ) {
  40                 $out = '<' . $element;
  41                 if( !is_null( $attribs ) ) {
  42                         $out .=  self::expandAttributes( $attribs );
  43                 }
  44                 if( is_null( $contents ) ) {
  45                         $out .= '>';
  46                 } else {
  47                         if( $allowShortTag && $contents === '' ) {
  48                                 $out .= ' />';
  49                         } else {
  50                                 $out .= '>' . htmlspecialchars( $contents ) . "</$element>";
  51                         }
  52                 }
  53                 return $out;
  54         }
  55
  56         /**
  57          * Given an array of ('attributename' => 'value'), it generates the code
  58          * to set the XML attributes : attributename="value".
  59          * The values are passed to Sanitizer::encodeAttribute.
  60          * Return null if no attributes given.
  61          * @param $attribs Array of attributes for an XML element
  62          * @throws MWException
  63          * @return null|string
  64          */
  65         public static function expandAttributes( $attribs ) {
  66                 $out = '';
  67                 if( is_null( $attribs ) ) {
  68                         return null;
  69                 } elseif( is_array( $attribs ) ) {
  70                         foreach( $attribs as $name => $val ) {
  71                                 $out .= " {$name}=\"" . Sanitizer::encodeAttribute( $val ) . '"';
  72                         }
  73                         return $out;
  74                 } else {
  75                         throw new MWException( 'Expected attribute array, got something else in ' . __METHOD__ );
  76                 }
  77         }
  78
  79         /**
  80          * Format an XML element as with self::element(), but run text through the
  81          * $wgContLang->normalize() validator first to ensure that no invalid UTF-8
  82          * is passed.
  83          *
  84          * @param $element String:
  85          * @param $attribs Array: Name=>value pairs. Values will be escaped.
  86          * @param $contents String: NULL to make an open tag only; '' for a contentless closed tag (default)
  87          * @return string
  88          */
  89         public static function elementClean( $element, $attribs = array(), $contents = '') {
  90                 global $wgContLang;
  91                 if( $attribs ) {
  92                         $attribs = array_map( array( 'UtfNormal', 'cleanUp' ), $attribs );
  93                 }
  94                 if( $contents ) {
  95                         wfProfileIn( __METHOD__ . '-norm' );
  96                         $contents = $wgContLang->normalize( $contents );
  97                         wfProfileOut( __METHOD__ . '-norm' );
  98                 }
  99                 return self::element( $element, $attribs, $contents );
 100         }
 101
 102         /**
 103          * This opens an XML element
 104          *
 105          * @param $element String name of the element
 106          * @param $attribs array of attributes, see Xml::expandAttributes()
 107          * @return string
 108          */
 109         public static function openElement( $element, $attribs = null ) {
 110                 return '<' . $element . self::expandAttributes( $attribs ) . '>';
 111         }
 112
 113         /**
 114          * Shortcut to close an XML element
 115          * @param $element String element name
 116          * @return string
 117          */
 118         public static function closeElement( $element ) { return "</$element>"; }
 119
 120         /**
 121          * Same as Xml::element(), but does not escape contents. Handy when the
 122          * content you have is already valid xml.
 123          *
 124          * @param $element String element name
 125          * @param $attribs array of attributes
 126          * @param $contents String content of the element
 127          * @return string
 128          */
 129         public static function tags( $element, $attribs = null, $contents ) {
 130                 return self::openElement( $element, $attribs ) . $contents . "</$element>";
 131         }
 132
 133         /**
 134          * Build a drop-down box for selecting a namespace
 135          *
 136          * @param $selected Mixed: Namespace which should be pre-selected
 137          * @param $all Mixed: Value of an item denoting all namespaces, or null to omit
 138          * @param $element_name String: value of the "name" attribute of the select tag
 139          * @param $label String: optional label to add to the field
 140          * @return string
 141          * @deprecated since 1.19
 142          */
 143         public static function namespaceSelector( $selected = '', $all = null, $element_name = 'namespace', $label = null ) {
 144                 wfDeprecated( __METHOD__, '1.19' );
 145                 return Html::namespaceSelector( array(
 146                         'selected' => $selected,
 147                         'all'      => $all,
 148                         'label'    => $label,
 149                 ), array(
 150                         'name'  => $element_name,
 151                         'id'    => 'namespace',
 152                         'class' => 'namespaceselector',
 153                 ) );
 154         }
 155
 156         /**
 157          * Create a date selector
 158          *
 159          * @param $selected Mixed: the month which should be selected, default ''
 160          * @param $allmonths String: value of a special item denoting all month. Null to not include (default)
 161          * @param $id String: Element identifier
 162          * @return String: Html string containing the month selector
 163          */
 164         public static function monthSelector( $selected = '', $allmonths = null, $id = 'month' ) {
 165                 global $wgLang;
 166                 $options = array();
 167                 if( is_null( $selected ) )
 168                         $selected = '';
 169                 if( !is_null( $allmonths ) )
 170                         $options[] = self::option( wfMessage( 'monthsall' )->text(), $allmonths, $selected === $allmonths );
 171                 for( $i = 1; $i < 13; $i++ )
 172                         $options[] = self::option( $wgLang->getMonthName( $i ), $i, $selected === $i );
 173                 return self::openElement( 'select', array( 'id' => $id, 'name' => 'month', 'class' => 'mw-month-selector' ) )
 174                         . implode( "\n", $options )
 175                         . self::closeElement( 'select' );
 176         }
 177
 178         /**
 179          * @param $year Integer
 180          * @param $month Integer
 181          * @return string Formatted HTML
 182          */
 183         public static function dateMenu( $year, $month ) {
 184                 # Offset overrides year/month selection
 185                 if( $month && $month !== -1 ) {
 186                         $encMonth = intval( $month );
 187                 } else {
 188                         $encMonth = '';
 189                 }
 190                 if( $year ) {
 191                         $encYear = intval( $year );
 192                 } elseif( $encMonth ) {
 193                         $thisMonth = intval( gmdate( 'n' ) );
 194                         $thisYear = intval( gmdate( 'Y' ) );
 195                         if( intval($encMonth) > $thisMonth ) {
 196                                 $thisYear--;
 197                         }
 198                         $encYear = $thisYear;
 199                 } else {
 200                         $encYear = '';
 201                 }
 202                 $inputAttribs = array( 'id' => 'year', 'maxlength' => 4, 'size' => 7 );
 203                 return self::label( wfMessage( 'year' )->text(), 'year' ) . ' '.
 204                         Html::input( 'year', $encYear, 'number', $inputAttribs ) . ' '.
 205                         self::label( wfMessage( 'month' )->text(), 'month' ) . ' '.
 206                         self::monthSelector( $encMonth, -1 );
 207         }
 208
 209         /**
 210          * Construct a language selector appropriate for use in a form or preferences
 211          *
 212          * @param string $selected The language code of the selected language
 213          * @param boolean $customisedOnly If true only languages which have some content are listed
 214          * @param string $inLanguage The ISO code of the language to display the select list in (optional)
 215          * @param array $overrideAttrs Override the attributes of the select tag (since 1.20)
 216          * @param Message|null $msg Label message key (since 1.20)
 217          * @return array containing 2 items: label HTML and select list HTML
 218          */
 219         public static function languageSelector( $selected, $customisedOnly = true, $inLanguage = null, $overrideAttrs = array(), Message $msg = null ) {
 220                 global $wgLanguageCode;
 221
 222                 $include = $customisedOnly ? 'mwfile' : 'mw';
 223                 $languages = Language::fetchLanguageNames( $inLanguage, $include );
 224
 225                 // Make sure the site language is in the list;
 226                 // a custom language code might not have a defined name...
 227                 if( !array_key_exists( $wgLanguageCode, $languages ) ) {
 228                         $languages[$wgLanguageCode] = $wgLanguageCode;
 229                 }
 230
 231                 ksort( $languages );
 232
 233                 /**
 234                  * If a bogus value is set, default to the content language.
 235                  * Otherwise, no default is selected and the user ends up
 236                  * with Afrikaans since it's first in the list.
 237                  */
 238                 $selected = isset( $languages[$selected] ) ? $selected : $wgLanguageCode;
 239                 $options = "\n";
 240                 foreach( $languages as $code => $name ) {
 241                         $options .= Xml::option( "$code - $name", $code, ($code == $selected) ) . "\n";
 242                 }
 243
 244                 $attrs = array( 'id' => 'wpUserLanguage', 'name' => 'wpUserLanguage' );
 245                 $attrs = array_merge( $attrs, $overrideAttrs );
 246
 247                 if( $msg === null ) {
 248                         $msg = wfMessage( 'yourlanguage' );
 249                 }
 250                 return array(
 251                         Xml::label( $msg->text(), $attrs['id'] ),
 252                         Xml::tags( 'select', $attrs, $options )
 253                 );
 254
 255         }
 256
 257         /**
 258          * Shortcut to make a span element
 259          * @param $text String content of the element, will be escaped
 260          * @param $class String class name of the span element
 261          * @param $attribs array other attributes
 262          * @return string
 263          */
 264         public static function span( $text, $class, $attribs = array() ) {
 265                 return self::element( 'span', array( 'class' => $class ) + $attribs, $text );
 266         }
 267
 268         /**
 269          * Shortcut to make a specific element with a class attribute
 270          * @param $text string content of the element, will be escaped
 271          * @param $class string class name of the span element
 272          * @param $tag string element name
 273          * @param $attribs array other attributes
 274          * @return string
 275          */
 276         public static function wrapClass( $text, $class, $tag = 'span', $attribs = array() ) {
 277                 return self::tags( $tag, array( 'class' => $class ) + $attribs, $text );
 278         }
 279
 280         /**
 281          * Convenience function to build an HTML text input field
 282          * @param $name String value of the name attribute
 283          * @param $size int value of the size attribute
 284          * @param $value mixed value of the value attribute
 285          * @param $attribs array other attributes
 286          * @return string HTML
 287          */
 288         public static function input( $name, $size = false, $value = false, $attribs = array() ) {
 289                 $attributes = array( 'name' => $name );
 290
 291                 if( $size ) {
 292                         $attributes['size'] = $size;
 293                 }
 294
 295                 if( $value !== false ) { // maybe 0
 296                         $attributes['value'] = $value;
 297                 }
 298
 299                 return self::element( 'input', $attributes + $attribs );
 300         }
 301
 302         /**
 303          * Convenience function to build an HTML password input field
 304          * @param $name string value of the name attribute
 305          * @param $size int value of the size attribute
 306          * @param $value mixed value of the value attribute
 307          * @param $attribs array other attributes
 308          * @return string HTML
 309          */
 310         public static function password( $name, $size = false, $value = false, $attribs = array() ) {
 311                 return self::input( $name, $size, $value, array_merge( $attribs, array( 'type' => 'password' ) ) );
 312         }
 313
 314         /**
 315          * Internal function for use in checkboxes and radio buttons and such.
 316          *
 317          * @param $name string
 318          * @param $present bool
 319          *
 320          * @return array
 321          */
 322         public static function attrib( $name, $present = true ) {
 323                 return $present ? array( $name => $name ) : array();
 324         }
 325
 326         /**
 327          * Convenience function to build an HTML checkbox
 328          * @param $name String value of the name attribute
 329          * @param $checked Bool Whether the checkbox is checked or not
 330          * @param $attribs Array other attributes
 331          * @return string HTML
 332          */
 333         public static function check( $name, $checked = false, $attribs=array() ) {
 334                 return self::element( 'input', array_merge(
 335                         array(
 336                                 'name' => $name,
 337                                 'type' => 'checkbox',
 338                                 'value' => 1 ),
 339                         self::attrib( 'checked', $checked ),
 340                         $attribs ) );
 341         }
 342
 343         /**
 344          * Convenience function to build an HTML radio button
 345          * @param $name String value of the name attribute
 346          * @param $value String value of the value attribute
 347          * @param $checked Bool Whether the checkbox is checked or not
 348          * @param $attribs Array other attributes
 349          * @return string HTML
 350          */
 351         public static function radio( $name, $value, $checked = false, $attribs = array() ) {
 352                 return self::element( 'input', array(
 353                         'name' => $name,
 354                         'type' => 'radio',
 355                         'value' => $value ) + self::attrib( 'checked', $checked ) + $attribs );
 356         }
 357
 358         /**
 359          * Convenience function to build an HTML form label
 360          * @param $label String text of the label
 361          * @param $id
 362          * @param $attribs Array an attribute array.  This will usuall be
 363          *     the same array as is passed to the corresponding input element,
 364          *     so this function will cherry-pick appropriate attributes to
 365          *     apply to the label as well; only class and title are applied.
 366          * @return string HTML
 367          */
 368         public static function label( $label, $id, $attribs = array() ) {
 369                 $a = array( 'for' => $id );
 370
 371                 # FIXME avoid copy pasting below:
 372                 if( isset( $attribs['class'] ) ){
 373                                 $a['class'] = $attribs['class'];
 374                 }
 375                 if( isset( $attribs['title'] ) ){
 376                                 $a['title'] = $attribs['title'];
 377                 }
 378
 379                 return self::element( 'label', $a, $label );
 380         }
 381
 382         /**
 383          * Convenience function to build an HTML text input field with a label
 384          * @param $label String text of the label
 385          * @param $name String value of the name attribute
 386          * @param $id String id of the input
 387          * @param $size Int|Bool value of the size attribute
 388          * @param $value String|Bool value of the value attribute
 389          * @param $attribs array other attributes
 390          * @return string HTML
 391          */
 392         public static function inputLabel( $label, $name, $id, $size=false, $value=false, $attribs = array() ) {
 393                 list( $label, $input ) = self::inputLabelSep( $label, $name, $id, $size, $value, $attribs );
 394                 return $label . '&#160;' . $input;
 395         }
 396
 397         /**
 398          * Same as Xml::inputLabel() but return input and label in an array
 399          *
 400          * @param $label String
 401          * @param $name String
 402          * @param $id String
 403          * @param $size Int|Bool
 404          * @param $value String|Bool
 405          * @param $attribs array
 406          *
 407          * @return array
 408          */
 409         public static function inputLabelSep( $label, $name, $id, $size = false, $value = false, $attribs = array() ) {
 410                 return array(
 411                         Xml::label( $label, $id, $attribs ),
 412                         self::input( $name, $size, $value, array( 'id' => $id ) + $attribs )
 413                 );
 414         }
 415
 416         /**
 417          * Convenience function to build an HTML checkbox with a label
 418          *
 419          * @param $label
 420          * @param $name
 421          * @param $id
 422          * @param $checked bool
 423          * @param $attribs array
 424          *
 425          * @return string HTML
 426          */
 427         public static function checkLabel( $label, $name, $id, $checked = false, $attribs = array() ) {
 428                 return self::check( $name, $checked, array( 'id' => $id ) + $attribs ) .
 429                         '&#160;' .
 430                         self::label( $label, $id, $attribs );
 431         }
 432
 433         /**
 434          * Convenience function to build an HTML radio button with a label
 435          *
 436          * @param $label
 437          * @param $name
 438          * @param $value
 439          * @param $id
 440          * @param $checked bool
 441          * @param $attribs array
 442          *
 443          * @return string HTML
 444          */
 445         public static function radioLabel( $label, $name, $value, $id, $checked = false, $attribs = array() ) {
 446                 return self::radio( $name, $value, $checked, array( 'id' => $id ) + $attribs ) .
 447                         '&#160;' .
 448                         self::label( $label, $id, $attribs );
 449         }
 450
 451         /**
 452          * Convenience function to build an HTML submit button
 453          * @param $value String: label text for the button
 454          * @param $attribs Array: optional custom attributes
 455          * @return string HTML
 456          */
 457         public static function submitButton( $value, $attribs = array() ) {
 458                 return Html::element( 'input', array( 'type' => 'submit', 'value' => $value ) + $attribs );
 459         }
 460
 461         /**
 462          * Convenience function to build an HTML drop-down list item.
 463          * @param $text String: text for this item
 464          * @param $value String: form submission value; if empty, use text
 465          * @param $selected boolean: if true, will be the default selected item
 466          * @param $attribs array: optional additional HTML attributes
 467          * @return string HTML
 468          */
 469         public static function option( $text, $value=null, $selected = false,
 470                         $attribs = array() ) {
 471                 if( !is_null( $value ) ) {
 472                         $attribs['value'] = $value;
 473                 }
 474                 if( $selected ) {
 475                         $attribs['selected'] = 'selected';
 476                 }
 477                 return Html::element( 'option', $attribs, $text );
 478         }
 479
 480         /**
 481          * Build a drop-down box from a textual list.
 482          *
 483          * @param $name Mixed: Name and id for the drop-down
 484          * @param $list Mixed: Correctly formatted text (newline delimited) to be used to generate the options
 485          * @param $other Mixed: Text for the "Other reasons" option
 486          * @param $selected Mixed: Option which should be pre-selected
 487          * @param $class Mixed: CSS classes for the drop-down
 488          * @param $tabindex Mixed: Value of the tabindex attribute
 489          * @return string
 490          */
 491         public static function listDropDown( $name= '', $list = '', $other = '', $selected = '', $class = '', $tabindex = null ) {
 492                 $optgroup = false;
 493
 494                 $options = self::option( $other, 'other', $selected === 'other' );
 495
 496                 foreach ( explode( "\n", $list ) as $option) {
 497                                 $value = trim( $option );
 498                                 if ( $value == '' ) {
 499                                         continue;
 500                                 } elseif ( substr( $value, 0, 1) == '*' && substr( $value, 1, 1) != '*' ) {
 501                                         // A new group is starting ...
 502                                         $value = trim( substr( $value, 1 ) );
 503                                         if( $optgroup ) $options .= self::closeElement('optgroup');
 504                                         $options .= self::openElement( 'optgroup', array( 'label' => $value ) );
 505                                         $optgroup = true;
 506                                 } elseif ( substr( $value, 0, 2) == '**' ) {
 507                                         // groupmember
 508                                         $value = trim( substr( $value, 2 ) );
 509                                         $options .= self::option( $value, $value, $selected === $value );
 510                                 } else {
 511                                         // groupless reason list
 512                                         if( $optgroup ) $options .= self::closeElement('optgroup');
 513                                         $options .= self::option( $value, $value, $selected === $value );
 514                                         $optgroup = false;
 515                                 }
 516                         }
 517
 518                         if( $optgroup ) $options .= self::closeElement('optgroup');
 519
 520                 $attribs = array();
 521
 522                 if( $name ) {
 523                         $attribs['id'] = $name;
 524                         $attribs['name'] = $name;
 525                 }
 526
 527                 if( $class ) {
 528                         $attribs['class'] = $class;
 529                 }
 530
 531                 if( $tabindex ) {
 532                         $attribs['tabindex'] = $tabindex;
 533                 }
 534
 535                 return Xml::openElement( 'select', $attribs )
 536                         . "\n"
 537                         . $options
 538                         . "\n"
 539                         . Xml::closeElement( 'select' );
 540         }
 541
 542         /**
 543          * Shortcut for creating fieldsets.
 544          *
 545          * @param $legend string|bool Legend of the fieldset. If evaluates to false, legend is not added.
 546          * @param $content string Pre-escaped content for the fieldset. If false, only open fieldset is returned.
 547          * @param $attribs array Any attributes to fieldset-element.
 548          *
 549          * @return string
 550          */
 551         public static function fieldset( $legend = false, $content = false, $attribs = array() ) {
 552                 $s = Xml::openElement( 'fieldset', $attribs ) . "\n";
 553
 554                 if ( $legend ) {
 555                         $s .= Xml::element( 'legend', null, $legend ) . "\n";
 556                 }
 557
 558                 if ( $content !== false ) {
 559                         $s .= $content . "\n";
 560                         $s .= Xml::closeElement( 'fieldset' ) . "\n";
 561                 }
 562
 563                 return $s;
 564         }
 565
 566         /**
 567          * Shortcut for creating textareas.
 568          *
 569          * @param $name string The 'name' for the textarea
 570          * @param $content string Content for the textarea
 571          * @param $cols int The number of columns for the textarea
 572          * @param $rows int The number of rows for the textarea
 573          * @param $attribs array Any other attributes for the textarea
 574          *
 575          * @return string
 576          */
 577         public static function textarea( $name, $content, $cols = 40, $rows = 5, $attribs = array() ) {
 578                 return self::element( 'textarea',
 579                                         array(
 580                                                 'name' => $name,
 581                                                 'id' => $name,
 582                                                 'cols' => $cols,
 583                                                 'rows' => $rows
 584                                         ) + $attribs,
 585                                         $content, false );
 586         }
 587
 588         /**
 589          * Returns an escaped string suitable for inclusion in a string literal
 590          * for JavaScript source code.
 591          * Illegal control characters are assumed not to be present.
 592          *
 593          * @param $string String to escape
 594          * @return String
 595          */
 596         public static function escapeJsString( $string ) {
 597                 // See ECMA 262 section 7.8.4 for string literal format
 598                 $pairs = array(
 599                         "\\" => "\\\\",
 600                         "\"" => "\\\"",
 601                         '\'' => '\\\'',
 602                         "\n" => "\\n",
 603                         "\r" => "\\r",
 604
 605                         # To avoid closing the element or CDATA section
 606                         "<" => "\\x3c",
 607                         ">" => "\\x3e",
 608
 609                         # To avoid any complaints about bad entity refs
 610                         "&" => "\\x26",
 611
 612                         # Work around https://bugzilla.mozilla.org/show_bug.cgi?id=274152
 613                         # Encode certain Unicode formatting chars so affected
 614                         # versions of Gecko don't misinterpret our strings;
 615                         # this is a common problem with Farsi text.
 616                         "\xe2\x80\x8c" => "\\u200c", // ZERO WIDTH NON-JOINER
 617                         "\xe2\x80\x8d" => "\\u200d", // ZERO WIDTH JOINER
 618                 );
 619
 620                 return strtr( $string, $pairs );
 621         }
 622
 623         /**
 624          * Encode a variable of unknown type to JavaScript.
 625          * Arrays are converted to JS arrays, objects are converted to JS associative
 626          * arrays (objects). So cast your PHP associative arrays to objects before
 627          * passing them to here.
 628          *
 629          * @param $value
 630          *
 631          * @return string
 632          */
 633         public static function encodeJsVar( $value ) {
 634                 if ( is_bool( $value ) ) {
 635                         $s = $value ? 'true' : 'false';
 636                 } elseif ( is_null( $value ) ) {
 637                         $s = 'null';
 638                 } elseif ( is_int( $value ) || is_float( $value ) ) {
 639                         $s = strval($value);
 640                 } elseif ( is_array( $value ) && // Make sure it's not associative.
 641                                         array_keys($value) === range( 0, count($value) - 1 ) ||
 642                                         count($value) == 0
 643                                 ) {
 644                         $s = '[';
 645                         foreach ( $value as $elt ) {
 646                                 if ( $s != '[' ) {
 647                                         $s .= ',';
 648                                 }
 649                                 $s .= self::encodeJsVar( $elt );
 650                         }
 651                         $s .= ']';
 652                 } elseif ( $value instanceof XmlJsCode ) {
 653                         $s = $value->value;
 654                 } elseif ( is_object( $value ) || is_array( $value ) ) {
 655                         // Objects and associative arrays
 656                         $s = '{';
 657                         foreach ( (array)$value as $name => $elt ) {
 658                                 if ( $s != '{' ) {
 659                                         $s .= ',';
 660                                 }
 661
 662                                 $s .= '"' . self::escapeJsString( $name ) . '":' .
 663                                         self::encodeJsVar( $elt );
 664                         }
 665                         $s .= '}';
 666                 } else {
 667                         $s = '"' . self::escapeJsString( $value ) . '"';
 668                 }
 669                 return $s;
 670         }
 671
 672         /**
 673          * Create a call to a JavaScript function. The supplied arguments will be
 674          * encoded using Xml::encodeJsVar().
 675          *
 676          * @param $name String The name of the function to call, or a JavaScript expression
 677          *    which evaluates to a function object which is called.
 678          * @param $args Array of arguments to pass to the function.
 679          *
 680          * @since 1.17
 681          *
 682          * @return string
 683          */
 684         public static function encodeJsCall( $name, $args ) {
 685                 $s = "$name(";
 686                 $first = true;
 687
 688                 foreach ( $args as $arg ) {
 689                         if ( $first ) {
 690                                 $first = false;
 691                         } else {
 692                                 $s .= ', ';
 693                         }
 694
 695                         $s .= Xml::encodeJsVar( $arg );
 696                 }
 697
 698                 $s .= ");\n";
 699
 700                 return $s;
 701         }
 702
 703         /**
 704          * Check if a string is well-formed XML.
 705          * Must include the surrounding tag.
 706          *
 707          * @param $text String: string to test.
 708          * @return bool
 709          *
 710          * @todo Error position reporting return
 711          */
 712         public static function isWellFormed( $text ) {
 713                 $parser = xml_parser_create( "UTF-8" );
 714
 715                 # case folding violates XML standard, turn it off
 716                 xml_parser_set_option( $parser, XML_OPTION_CASE_FOLDING, false );
 717
 718                 if( !xml_parse( $parser, $text, true ) ) {
 719                         //$err = xml_error_string( xml_get_error_code( $parser ) );
 720                         //$position = xml_get_current_byte_index( $parser );
 721                         //$fragment = $this->extractFragment( $html, $position );
 722                         //$this->mXmlError = "$err at byte $position:\n$fragment";
 723                         xml_parser_free( $parser );
 724                         return false;
 725                 }
 726
 727                 xml_parser_free( $parser );
 728
 729                 return true;
 730         }
 731
 732         /**
 733          * Check if a string is a well-formed XML fragment.
 734          * Wraps fragment in an \<html\> bit and doctype, so it can be a fragment
 735          * and can use HTML named entities.
 736          *
 737          * @param $text String:
 738          * @return bool
 739          */
 740         public static function isWellFormedXmlFragment( $text ) {
 741                 $html =
 742                         Sanitizer::hackDocType() .
 743                         '<html>' .
 744                         $text .
 745                         '</html>';
 746
 747                 return Xml::isWellFormed( $html );
 748         }
 749
 750         /**
 751          * Replace " > and < with their respective HTML entities ( &quot;,
 752          * &gt;, &lt;)
 753          *
 754          * @param $in String: text that might contain HTML tags.
 755          * @return string Escaped string
 756          */
 757         public static function escapeTagsOnly( $in ) {
 758                 return str_replace(
 759                         array( '"', '>', '<' ),
 760                         array( '&quot;', '&gt;', '&lt;' ),
 761                         $in );
 762         }
 763
 764         /**
 765         * Generate a form (without the opening form element).
 766         * Output optionally includes a submit button.
 767         * @param $fields Array Associative array, key is message corresponding to a description for the field (colon is in the message), value is appropriate input.
 768         * @param $submitLabel String A message containing a label for the submit button.
 769         * @return string HTML form.
 770         */
 771         public static function buildForm( $fields, $submitLabel = null ) {
 772                 $form = '';
 773                 $form .= "<table><tbody>";
 774
 775                 foreach( $fields as $labelmsg => $input ) {
 776                         $id = "mw-$labelmsg";
 777                         $form .= Xml::openElement( 'tr', array( 'id' => $id ) );
 778                         $form .= Xml::tags( 'td', array('class' => 'mw-label'), wfMessage( $labelmsg )->parse() );
 779                         $form .= Xml::openElement( 'td', array( 'class' => 'mw-input' ) ) . $input . Xml::closeElement( 'td' );
 780                         $form .= Xml::closeElement( 'tr' );
 781                 }
 782
 783                 if( $submitLabel ) {
 784                         $form .= Xml::openElement( 'tr' );
 785                         $form .= Xml::tags( 'td', array(), '' );
 786                         $form .= Xml::openElement( 'td', array( 'class' => 'mw-submit' ) ) . Xml::submitButton( wfMessage( $submitLabel )->text() ) . Xml::closeElement( 'td' );
 787                         $form .= Xml::closeElement( 'tr' );
 788                 }
 789
 790                 $form .= "</tbody></table>";
 791
 792                 return $form;
 793         }
 794
 795         /**
 796          * Build a table of data
 797          * @param $rows array An array of arrays of strings, each to be a row in a table
 798          * @param $attribs array An array of attributes to apply to the table tag [optional]
 799          * @param $headers array An array of strings to use as table headers [optional]
 800          * @return string
 801          */
 802         public static function buildTable( $rows, $attribs = array(), $headers = null ) {
 803                 $s = Xml::openElement( 'table', $attribs );
 804
 805                 if ( is_array( $headers ) ) {
 806                         $s .= Xml::openElement( 'thead', $attribs );
 807
 808                         foreach( $headers as $id => $header ) {
 809                                 $attribs = array();
 810
 811                                 if ( is_string( $id ) ) {
 812                                         $attribs['id'] = $id;
 813                                 }
 814
 815                                 $s .= Xml::element( 'th', $attribs, $header );
 816                         }
 817                         $s .= Xml::closeElement( 'thead' );
 818                 }
 819
 820                 foreach( $rows as $id => $row ) {
 821                         $attribs = array();
 822
 823                         if ( is_string( $id ) ) {
 824                                 $attribs['id'] = $id;
 825                         }
 826
 827                         $s .= Xml::buildTableRow( $attribs, $row );
 828                 }
 829
 830                 $s .= Xml::closeElement( 'table' );
 831
 832                 return $s;
 833         }
 834
 835         /**
 836          * Build a row for a table
 837          * @param $attribs array An array of attributes to apply to the tr tag
 838          * @param $cells array An array of strings to put in <td>
 839          * @return string
 840          */
 841         public static function buildTableRow( $attribs, $cells ) {
 842                 $s = Xml::openElement( 'tr', $attribs );
 843
 844                 foreach( $cells as $id => $cell ) {
 845
 846                         $attribs = array();
 847
 848                         if ( is_string( $id ) ) {
 849                                 $attribs['id'] = $id;
 850                         }
 851
 852                         $s .= Xml::element( 'td', $attribs, $cell );
 853                 }
 854
 855                 $s .= Xml::closeElement( 'tr' );
 856
 857                 return $s;
 858         }
 859 }
 860
 861 class XmlSelect {
 862         protected $options = array();
 863         protected $default = false;
 864         protected $attributes = array();
 865
 866         public function __construct( $name = false, $id = false, $default = false ) {
 867                 if ( $name ) {
 868                         $this->setAttribute( 'name', $name );
 869                 }
 870
 871                 if ( $id ) {
 872                         $this->setAttribute( 'id', $id );
 873                 }
 874
 875                 if ( $default !== false ) {
 876                         $this->default = $default;
 877                 }
 878         }
 879
 880         /**
 881          * @param $default
 882          */
 883         public function setDefault( $default ) {
 884                 $this->default = $default;
 885         }
 886
 887         /**
 888          * @param $name string
 889          * @param $value
 890          */
 891         public function setAttribute( $name, $value ) {
 892                 $this->attributes[$name] = $value;
 893         }
 894
 895         /**
 896          * @param $name
 897          * @return array|null
 898          */
 899         public function getAttribute( $name ) {
 900                 if ( isset( $this->attributes[$name] ) ) {
 901                         return $this->attributes[$name];
 902                 } else {
 903                         return null;
 904                 }
 905         }
 906
 907         /**
 908          * @param $name
 909          * @param $value bool
 910          */
 911         public function addOption( $name, $value = false ) {
 912                 // Stab stab stab
 913                 $value = ($value !== false) ? $value : $name;
 914
 915                 $this->options[] = array( $name => $value );
 916         }
 917
 918         /**
 919          * This accepts an array of form
 920          * label => value
 921          * label => ( label => value, label => value )
 922          *
 923          * @param  $options
 924          */
 925         public function addOptions( $options ) {
 926                 $this->options[] = $options;
 927         }
 928
 929         /**
 930          * This accepts an array of form
 931          * label => value
 932          * label => ( label => value, label => value )
 933          *
 934          * @param  $options
 935          * @param bool $default
 936          * @return string
 937          */
 938         static function formatOptions( $options, $default = false ) {
 939                 $data = '';
 940
 941                 foreach( $options as $label => $value ) {
 942                         if ( is_array( $value ) ) {
 943                                 $contents = self::formatOptions( $value, $default );
 944                                 $data .= Html::rawElement( 'optgroup', array( 'label' => $label ), $contents ) . "\n";
 945                         } else {
 946                                 $data .= Xml::option( $label, $value, $value === $default ) . "\n";
 947                         }
 948                 }
 949
 950                 return $data;
 951         }
 952
 953         /**
 954          * @return string
 955          */
 956         public function getHTML() {
 957                 $contents = '';
 958
 959                 foreach ( $this->options as $options ) {
 960                         $contents .= self::formatOptions( $options, $this->default );
 961                 }
 962
 963                 return Html::rawElement( 'select', $this->attributes, rtrim( $contents ) );
 964         }
 965 }
 966
 967 /**
 968  * A wrapper class which causes Xml::encodeJsVar() and Xml::encodeJsCall() to
 969  * interpret a given string as being a JavaScript expression, instead of string
 970  * data.
 971  *
 972  * Example:
 973  *
 974  *    Xml::encodeJsVar( new XmlJsCode( 'a + b' ) );
 975  *
 976  * Returns "a + b".
 977  * @since 1.17
 978  */
 979 class XmlJsCode {
 980         public $value;
 981
 982         function __construct( $value ) {
 983                 $this->value = $value;
 984         }
 985 }