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 string $element Element name
  34          * @param array $attribs Name=>value pairs. Values will be escaped.
  35          * @param string $contents Null to make an open tag only; '' for a contentless closed tag (default)
  36          * @param bool $allowShortTag Whether '' in $contents will result in a contentless closed tag
  37          * @return string
  38          */
  39         public static function element( $element, $attribs = null, $contents = '',
  40                 $allowShortTag = true
  41         ) {
  42                 $out = '<' . $element;
  43                 if ( !is_null( $attribs ) ) {
  44                         $out .= self::expandAttributes( $attribs );
  45                 }
  46                 if ( is_null( $contents ) ) {
  47                         $out .= '>';
  48                 } else {
  49                         if ( $allowShortTag && $contents === '' ) {
  50                                 $out .= ' />';
  51                         } else {
  52                                 $out .= '>' . htmlspecialchars( $contents ) . "</$element>";
  53                         }
  54                 }
  55                 return $out;
  56         }
  57
  58         /**
  59          * Given an array of ('attributename' => 'value'), it generates the code
  60          * to set the XML attributes : attributename="value".
  61          * The values are passed to Sanitizer::encodeAttribute.
  62          * Return null if no attributes given.
  63          * @param array $attribs Array of attributes for an XML element
  64          * @throws MWException
  65          * @return null|string
  66          */
  67         public static function expandAttributes( $attribs ) {
  68                 $out = '';
  69                 if ( is_null( $attribs ) ) {
  70                         return null;
  71                 } elseif ( is_array( $attribs ) ) {
  72                         foreach ( $attribs as $name => $val ) {
  73                                 $out .= " {$name}=\"" . Sanitizer::encodeAttribute( $val ) . '"';
  74                         }
  75                         return $out;
  76                 } else {
  77                         throw new MWException( 'Expected attribute array, got something else in ' . __METHOD__ );
  78                 }
  79         }
  80
  81         /**
  82          * Format an XML element as with self::element(), but run text through the
  83          * $wgContLang->normalize() validator first to ensure that no invalid UTF-8
  84          * is passed.
  85          *
  86          * @param string $element
  87          * @param array $attribs Name=>value pairs. Values will be escaped.
  88          * @param string $contents Null to make an open tag only; '' for a contentless closed tag (default)
  89          * @return string
  90          */
  91         public static function elementClean( $element, $attribs = [], $contents = '' ) {
  92                 global $wgContLang;
  93                 if ( $attribs ) {
  94                         $attribs = array_map( [ 'UtfNormal\Validator', 'cleanUp' ], $attribs );
  95                 }
  96                 if ( $contents ) {
  97                         $contents = $wgContLang->normalize( $contents );
  98                 }
  99                 return self::element( $element, $attribs, $contents );
 100         }
 101
 102         /**
 103          * This opens an XML element
 104          *
 105          * @param string $element Name of the element
 106          * @param array $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 string $element Element name
 116          * @return string
 117          */
 118         public static function closeElement( $element ) {
 119                 return "</$element>";
 120         }
 121
 122         /**
 123          * Same as Xml::element(), but does not escape contents. Handy when the
 124          * content you have is already valid xml.
 125          *
 126          * @param string $element Element name
 127          * @param array $attribs Array of attributes
 128          * @param string $contents Content of the element
 129          * @return string
 130          */
 131         public static function tags( $element, $attribs = null, $contents ) {
 132                 return self::openElement( $element, $attribs ) . $contents . "</$element>";
 133         }
 134
 135         /**
 136          * Create a date selector
 137          *
 138          * @param string $selected The month which should be selected, default ''.
 139          * @param string $allmonths Value of a special item denoting all month.
 140          *   Null to not include (default).
 141          * @param string $id Element identifier
 142          * @return string Html string containing the month selector
 143          */
 144         public static function monthSelector( $selected = '', $allmonths = null, $id = 'month' ) {
 145                 global $wgLang;
 146                 $options = [];
 147                 $data = new XmlSelect( 'month', $id, $selected );
 148                 if ( is_null( $selected ) ) {
 149                         $selected = '';
 150                 }
 151                 if ( !is_null( $allmonths ) ) {
 152                         $options[wfMessage( 'monthsall' )->text()] = $allmonths;
 153                 }
 154                 for ( $i = 1; $i < 13; $i++ ) {
 155                         $options[$wgLang->getMonthName( $i )] = $i;
 156                 }
 157                 $data->addOptions( $options );
 158                 $data->setAttribute( 'class', 'mw-month-selector' );
 159                 return $data->getHTML();
 160         }
 161
 162         /**
 163          * @param int $year
 164          * @param int $month
 165          * @return string Formatted HTML
 166          */
 167         public static function dateMenu( $year, $month ) {
 168                 # Offset overrides year/month selection
 169                 if ( $month && $month !== -1 ) {
 170                         $encMonth = intval( $month );
 171                 } else {
 172                         $encMonth = '';
 173                 }
 174                 if ( $year ) {
 175                         $encYear = intval( $year );
 176                 } elseif ( $encMonth ) {
 177                         $timestamp = MWTimestamp::getInstance();
 178                         $thisMonth = intval( $timestamp->format( 'n' ) );
 179                         $thisYear = intval( $timestamp->format( 'Y' ) );
 180                         if ( intval( $encMonth ) > $thisMonth ) {
 181                                 $thisYear--;
 182                         }
 183                         $encYear = $thisYear;
 184                 } else {
 185                         $encYear = '';
 186                 }
 187                 $inputAttribs = [ 'id' => 'year', 'maxlength' => 4, 'size' => 7 ];
 188                 return self::label( wfMessage( 'year' )->text(), 'year' ) . ' ' .
 189                         Html::input( 'year', $encYear, 'number', $inputAttribs ) . ' ' .
 190                         self::label( wfMessage( 'month' )->text(), 'month' ) . ' ' .
 191                         self::monthSelector( $encMonth, -1 );
 192         }
 193
 194         /**
 195          * Construct a language selector appropriate for use in a form or preferences
 196          *
 197          * @param string $selected The language code of the selected language
 198          * @param bool $customisedOnly If true only languages which have some content are listed
 199          * @param string $inLanguage The ISO code of the language to display the select list in (optional)
 200          * @param array $overrideAttrs Override the attributes of the select tag (since 1.20)
 201          * @param Message|null $msg Label message key (since 1.20)
 202          * @return array Array containing 2 items: label HTML and select list HTML
 203          */
 204         public static function languageSelector( $selected, $customisedOnly = true,
 205                 $inLanguage = null, $overrideAttrs = [], Message $msg = null
 206         ) {
 207                 global $wgLanguageCode;
 208
 209                 $include = $customisedOnly ? 'mwfile' : 'mw';
 210                 $languages = Language::fetchLanguageNames( $inLanguage, $include );
 211
 212                 // Make sure the site language is in the list;
 213                 // a custom language code might not have a defined name...
 214                 if ( !array_key_exists( $wgLanguageCode, $languages ) ) {
 215                         $languages[$wgLanguageCode] = $wgLanguageCode;
 216                 }
 217
 218                 ksort( $languages );
 219
 220                 /**
 221                  * If a bogus value is set, default to the content language.
 222                  * Otherwise, no default is selected and the user ends up
 223                  * with Afrikaans since it's first in the list.
 224                  */
 225                 $selected = isset( $languages[$selected] ) ? $selected : $wgLanguageCode;
 226                 $options = "\n";
 227                 foreach ( $languages as $code => $name ) {
 228                         $options .= Xml::option( "$code - $name", $code, $code == $selected ) . "\n";
 229                 }
 230
 231                 $attrs = [ 'id' => 'wpUserLanguage', 'name' => 'wpUserLanguage' ];
 232                 $attrs = array_merge( $attrs, $overrideAttrs );
 233
 234                 if ( $msg === null ) {
 235                         $msg = wfMessage( 'yourlanguage' );
 236                 }
 237                 return [
 238                         Xml::label( $msg->text(), $attrs['id'] ),
 239                         Xml::tags( 'select', $attrs, $options )
 240                 ];
 241
 242         }
 243
 244         /**
 245          * Shortcut to make a span element
 246          * @param string $text Content of the element, will be escaped
 247          * @param string $class Class name of the span element
 248          * @param array $attribs Other attributes
 249          * @return string
 250          */
 251         public static function span( $text, $class, $attribs = [] ) {
 252                 return self::element( 'span', [ 'class' => $class ] + $attribs, $text );
 253         }
 254
 255         /**
 256          * Shortcut to make a specific element with a class attribute
 257          * @param string $text Content of the element, will be escaped
 258          * @param string $class Class name of the span element
 259          * @param string $tag Element name
 260          * @param array $attribs Other attributes
 261          * @return string
 262          */
 263         public static function wrapClass( $text, $class, $tag = 'span', $attribs = [] ) {
 264                 return self::tags( $tag, [ 'class' => $class ] + $attribs, $text );
 265         }
 266
 267         /**
 268          * Convenience function to build an HTML text input field
 269          * @param string $name Value of the name attribute
 270          * @param int $size Value of the size attribute
 271          * @param mixed $value Value of the value attribute
 272          * @param array $attribs Other attributes
 273          * @return string HTML
 274          */
 275         public static function input( $name, $size = false, $value = false, $attribs = [] ) {
 276                 $attributes = [ 'name' => $name ];
 277
 278                 if ( $size ) {
 279                         $attributes['size'] = $size;
 280                 }
 281
 282                 if ( $value !== false ) { // maybe 0
 283                         $attributes['value'] = $value;
 284                 }
 285
 286                 return self::element( 'input',
 287                         Html::getTextInputAttributes( $attributes + $attribs ) );
 288         }
 289
 290         /**
 291          * Convenience function to build an HTML password input field
 292          * @param string $name Value of the name attribute
 293          * @param int $size Value of the size attribute
 294          * @param mixed $value Value of the value attribute
 295          * @param array $attribs Other attributes
 296          * @return string HTML
 297          */
 298         public static function password( $name, $size = false, $value = false,
 299                 $attribs = []
 300         ) {
 301                 return self::input( $name, $size, $value,
 302                         array_merge( $attribs, [ 'type' => 'password' ] ) );
 303         }
 304
 305         /**
 306          * Internal function for use in checkboxes and radio buttons and such.
 307          *
 308          * @param string $name
 309          * @param bool $present
 310          *
 311          * @return array
 312          */
 313         public static function attrib( $name, $present = true ) {
 314                 return $present ? [ $name => $name ] : [];
 315         }
 316
 317         /**
 318          * Convenience function to build an HTML checkbox
 319          * @param string $name Value of the name attribute
 320          * @param bool $checked Whether the checkbox is checked or not
 321          * @param array $attribs Array other attributes
 322          * @return string HTML
 323          */
 324         public static function check( $name, $checked = false, $attribs = [] ) {
 325                 return self::element( 'input', array_merge(
 326                         [
 327                                 'name' => $name,
 328                                 'type' => 'checkbox',
 329                                 'value' => 1 ],
 330                         self::attrib( 'checked', $checked ),
 331                         $attribs ) );
 332         }
 333
 334         /**
 335          * Convenience function to build an HTML radio button
 336          * @param string $name Value of the name attribute
 337          * @param string $value Value of the value attribute
 338          * @param bool $checked Whether the checkbox is checked or not
 339          * @param array $attribs Other attributes
 340          * @return string HTML
 341          */
 342         public static function radio( $name, $value, $checked = false, $attribs = [] ) {
 343                 return self::element( 'input', [
 344                         'name' => $name,
 345                         'type' => 'radio',
 346                         'value' => $value ] + self::attrib( 'checked', $checked ) + $attribs );
 347         }
 348
 349         /**
 350          * Convenience function to build an HTML form label
 351          * @param string $label Text of the label
 352          * @param string $id
 353          * @param array $attribs An attribute array.  This will usually be
 354          *     the same array as is passed to the corresponding input element,
 355          *     so this function will cherry-pick appropriate attributes to
 356          *     apply to the label as well; only class and title are applied.
 357          * @return string HTML
 358          */
 359         public static function label( $label, $id, $attribs = [] ) {
 360                 $a = [ 'for' => $id ];
 361
 362                 foreach ( [ 'class', 'title' ] as $attr ) {
 363                         if ( isset( $attribs[$attr] ) ) {
 364                                 $a[$attr] = $attribs[$attr];
 365                         }
 366                 }
 367
 368                 return self::element( 'label', $a, $label );
 369         }
 370
 371         /**
 372          * Convenience function to build an HTML text input field with a label
 373          * @param string $label Text of the label
 374          * @param string $name Value of the name attribute
 375          * @param string $id Id of the input
 376          * @param int|bool $size Value of the size attribute
 377          * @param string|bool $value Value of the value attribute
 378          * @param array $attribs Other attributes
 379          * @return string HTML
 380          */
 381         public static function inputLabel( $label, $name, $id, $size = false,
 382                 $value = false, $attribs = []
 383         ) {
 384                 list( $label, $input ) = self::inputLabelSep( $label, $name, $id, $size, $value, $attribs );
 385                 return $label . '&#160;' . $input;
 386         }
 387
 388         /**
 389          * Same as Xml::inputLabel() but return input and label in an array
 390          *
 391          * @param string $label
 392          * @param string $name
 393          * @param string $id
 394          * @param int|bool $size
 395          * @param string|bool $value
 396          * @param array $attribs
 397          *
 398          * @return array
 399          */
 400         public static function inputLabelSep( $label, $name, $id, $size = false,
 401                 $value = false, $attribs = []
 402         ) {
 403                 return [
 404                         Xml::label( $label, $id, $attribs ),
 405                         self::input( $name, $size, $value, [ 'id' => $id ] + $attribs )
 406                 ];
 407         }
 408
 409         /**
 410          * Convenience function to build an HTML checkbox with a label
 411          *
 412          * @param string $label
 413          * @param string $name
 414          * @param string $id
 415          * @param bool $checked
 416          * @param array $attribs
 417          *
 418          * @return string HTML
 419          */
 420         public static function checkLabel( $label, $name, $id, $checked = false, $attribs = [] ) {
 421                 global $wgUseMediaWikiUIEverywhere;
 422                 $chkLabel = self::check( $name, $checked, [ 'id' => $id ] + $attribs ) .
 423                         '&#160;' .
 424                         self::label( $label, $id, $attribs );
 425
 426                 if ( $wgUseMediaWikiUIEverywhere ) {
 427                         $chkLabel = self::openElement( 'div', [ 'class' => 'mw-ui-checkbox' ] ) .
 428                                 $chkLabel . self::closeElement( 'div' );
 429                 }
 430                 return $chkLabel;
 431         }
 432
 433         /**
 434          * Convenience function to build an HTML radio button with a label
 435          *
 436          * @param string $label
 437          * @param string $name
 438          * @param string $value
 439          * @param string $id
 440          * @param bool $checked
 441          * @param array $attribs
 442          *
 443          * @return string HTML
 444          */
 445         public static function radioLabel( $label, $name, $value, $id,
 446                 $checked = false, $attribs = []
 447         ) {
 448                 return self::radio( $name, $value, $checked, [ 'id' => $id ] + $attribs ) .
 449                         '&#160;' .
 450                         self::label( $label, $id, $attribs );
 451         }
 452
 453         /**
 454          * Convenience function to build an HTML submit button
 455          * When $wgUseMediaWikiUIEverywhere is true it will default to a constructive button
 456          * @param string $value Label text for the button
 457          * @param array $attribs Optional custom attributes
 458          * @return string HTML
 459          */
 460         public static function submitButton( $value, $attribs = [] ) {
 461                 global $wgUseMediaWikiUIEverywhere;
 462                 $baseAttrs = [
 463                         'type' => 'submit',
 464                         'value' => $value,
 465                 ];
 466                 // Done conditionally for time being as it is possible
 467                 // some submit forms
 468                 // might need to be mw-ui-destructive (e.g. delete a page)
 469                 if ( $wgUseMediaWikiUIEverywhere ) {
 470                         $baseAttrs['class'] = 'mw-ui-button mw-ui-constructive';
 471                 }
 472                 // Any custom attributes will take precendence of anything in baseAttrs e.g. override the class
 473                 $attribs = $attribs + $baseAttrs;
 474                 return Html::element( 'input', $attribs );
 475         }
 476
 477         /**
 478          * Convenience function to build an HTML drop-down list item.
 479          * @param string $text Text for this item. Will be HTML escaped
 480          * @param string $value Form submission value; if empty, use text
 481          * @param bool $selected If true, will be the default selected item
 482          * @param array $attribs Optional additional HTML attributes
 483          * @return string HTML
 484          */
 485         public static function option( $text, $value = null, $selected = false,
 486                         $attribs = [] ) {
 487                 if ( !is_null( $value ) ) {
 488                         $attribs['value'] = $value;
 489                 }
 490                 if ( $selected ) {
 491                         $attribs['selected'] = 'selected';
 492                 }
 493                 return Html::element( 'option', $attribs, $text );
 494         }
 495
 496         /**
 497          * Build a drop-down box from a textual list.
 498          *
 499          * @param string $name Name and id for the drop-down
 500          * @param string $list Correctly formatted text (newline delimited) to be
 501          *   used to generate the options.
 502          * @param string $other Text for the "Other reasons" option
 503          * @param string $selected Option which should be pre-selected
 504          * @param string $class CSS classes for the drop-down
 505          * @param int $tabindex Value of the tabindex attribute
 506          * @return string
 507          */
 508         public static function listDropDown( $name = '', $list = '', $other = '',
 509                 $selected = '', $class = '', $tabindex = null
 510         ) {
 511                 $optgroup = false;
 512
 513                 $options = self::option( $other, 'other', $selected === 'other' );
 514
 515                 foreach ( explode( "\n", $list ) as $option ) {
 516                         $value = trim( $option );
 517                         if ( $value == '' ) {
 518                                 continue;
 519                         } elseif ( substr( $value, 0, 1 ) == '*' && substr( $value, 1, 1 ) != '*' ) {
 520                                 // A new group is starting ...
 521                                 $value = trim( substr( $value, 1 ) );
 522                                 if ( $optgroup ) {
 523                                         $options .= self::closeElement( 'optgroup' );
 524                                 }
 525                                 $options .= self::openElement( 'optgroup', [ 'label' => $value ] );
 526                                 $optgroup = true;
 527                         } elseif ( substr( $value, 0, 2 ) == '**' ) {
 528                                 // groupmember
 529                                 $value = trim( substr( $value, 2 ) );
 530                                 $options .= self::option( $value, $value, $selected === $value );
 531                         } else {
 532                                 // groupless reason list
 533                                 if ( $optgroup ) {
 534                                         $options .= self::closeElement( 'optgroup' );
 535                                 }
 536                                 $options .= self::option( $value, $value, $selected === $value );
 537                                 $optgroup = false;
 538                         }
 539                 }
 540
 541                 if ( $optgroup ) {
 542                         $options .= self::closeElement( 'optgroup' );
 543                 }
 544
 545                 $attribs = [];
 546
 547                 if ( $name ) {
 548                         $attribs['id'] = $name;
 549                         $attribs['name'] = $name;
 550                 }
 551
 552                 if ( $class ) {
 553                         $attribs['class'] = $class;
 554                 }
 555
 556                 if ( $tabindex ) {
 557                         $attribs['tabindex'] = $tabindex;
 558                 }
 559
 560                 return Xml::openElement( 'select', $attribs )
 561                         . "\n"
 562                         . $options
 563                         . "\n"
 564                         . Xml::closeElement( 'select' );
 565         }
 566
 567         /**
 568          * Shortcut for creating fieldsets.
 569          *
 570          * @param string|bool $legend Legend of the fieldset. If evaluates to false,
 571          *   legend is not added.
 572          * @param string $content Pre-escaped content for the fieldset. If false,
 573          *   only open fieldset is returned.
 574          * @param array $attribs Any attributes to fieldset-element.
 575          *
 576          * @return string
 577          */
 578         public static function fieldset( $legend = false, $content = false, $attribs = [] ) {
 579                 $s = Xml::openElement( 'fieldset', $attribs ) . "\n";
 580
 581                 if ( $legend ) {
 582                         $s .= Xml::element( 'legend', null, $legend ) . "\n";
 583                 }
 584
 585                 if ( $content !== false ) {
 586                         $s .= $content . "\n";
 587                         $s .= Xml::closeElement( 'fieldset' ) . "\n";
 588                 }
 589
 590                 return $s;
 591         }
 592
 593         /**
 594          * Shortcut for creating textareas.
 595          *
 596          * @param string $name The 'name' for the textarea
 597          * @param string $content Content for the textarea
 598          * @param int $cols The number of columns for the textarea
 599          * @param int $rows The number of rows for the textarea
 600          * @param array $attribs Any other attributes for the textarea
 601          *
 602          * @return string
 603          */
 604         public static function textarea( $name, $content, $cols = 40, $rows = 5, $attribs = [] ) {
 605                 return self::element( 'textarea',
 606                                         Html::getTextInputAttributes(
 607                                                 [
 608                                                         'name' => $name,
 609                                                         'id' => $name,
 610                                                         'cols' => $cols,
 611                                                         'rows' => $rows
 612                                                 ] + $attribs
 613                                         ),
 614                                         $content, false );
 615         }
 616
 617         /**
 618          * Returns an escaped string suitable for inclusion in a string literal
 619          * for JavaScript source code.
 620          * Illegal control characters are assumed not to be present.
 621          *
 622          * @deprecated since 1.21; use Xml::encodeJsVar() or Xml::encodeJsCall() instead
 623          * @param string $string String to escape
 624          * @return string
 625          */
 626         public static function escapeJsString( $string ) {
 627                 // See ECMA 262 section 7.8.4 for string literal format
 628                 $pairs = [
 629                         "\\" => "\\\\",
 630                         "\"" => "\\\"",
 631                         '\'' => '\\\'',
 632                         "\n" => "\\n",
 633                         "\r" => "\\r",
 634
 635                         # To avoid closing the element or CDATA section
 636                         "<" => "\\x3c",
 637                         ">" => "\\x3e",
 638
 639                         # To avoid any complaints about bad entity refs
 640                         "&" => "\\x26",
 641
 642                         # Work around https://bugzilla.mozilla.org/show_bug.cgi?id=274152
 643                         # Encode certain Unicode formatting chars so affected
 644                         # versions of Gecko don't misinterpret our strings;
 645                         # this is a common problem with Farsi text.
 646                         "\xe2\x80\x8c" => "\\u200c", // ZERO WIDTH NON-JOINER
 647                         "\xe2\x80\x8d" => "\\u200d", // ZERO WIDTH JOINER
 648                 ];
 649
 650                 return strtr( $string, $pairs );
 651         }
 652
 653         /**
 654          * Encode a variable of arbitrary type to JavaScript.
 655          * If the value is an XmlJsCode object, pass through the object's value verbatim.
 656          *
 657          * @note Only use this function for generating JavaScript code. If generating output
 658          *       for a proper JSON parser, just call FormatJson::encode() directly.
 659          *
 660          * @param mixed $value The value being encoded. Can be any type except a resource.
 661          * @param bool $pretty If true, add non-significant whitespace to improve readability.
 662          * @return string|bool String if successful; false upon failure
 663          */
 664         public static function encodeJsVar( $value, $pretty = false ) {
 665                 if ( $value instanceof XmlJsCode ) {
 666                         return $value->value;
 667                 }
 668                 return FormatJson::encode( $value, $pretty, FormatJson::UTF8_OK );
 669         }
 670
 671         /**
 672          * Create a call to a JavaScript function. The supplied arguments will be
 673          * encoded using Xml::encodeJsVar().
 674          *
 675          * @since 1.17
 676          * @param string $name The name of the function to call, or a JavaScript expression
 677          *    which evaluates to a function object which is called.
 678          * @param array $args The arguments to pass to the function.
 679          * @param bool $pretty If true, add non-significant whitespace to improve readability.
 680          * @return string|bool String if successful; false upon failure
 681          */
 682         public static function encodeJsCall( $name, $args, $pretty = false ) {
 683                 foreach ( $args as &$arg ) {
 684                         $arg = Xml::encodeJsVar( $arg, $pretty );
 685                         if ( $arg === false ) {
 686                                 return false;
 687                         }
 688                 }
 689
 690                 return "$name(" . ( $pretty
 691                         ? ( ' ' . implode( ', ', $args ) . ' ' )
 692                         : implode( ',', $args )
 693                 ) . ");";
 694         }
 695
 696         /**
 697          * Check if a string is well-formed XML.
 698          * Must include the surrounding tag.
 699          * This function is a DoS vector if an attacker can define
 700          * entities in $text.
 701          *
 702          * @param string $text String to test.
 703          * @return bool
 704          *
 705          * @todo Error position reporting return
 706          */
 707         private static function isWellFormed( $text ) {
 708                 $parser = xml_parser_create( "UTF-8" );
 709
 710                 # case folding violates XML standard, turn it off
 711                 xml_parser_set_option( $parser, XML_OPTION_CASE_FOLDING, false );
 712
 713                 if ( !xml_parse( $parser, $text, true ) ) {
 714                         // $err = xml_error_string( xml_get_error_code( $parser ) );
 715                         // $position = xml_get_current_byte_index( $parser );
 716                         // $fragment = $this->extractFragment( $html, $position );
 717                         // $this->mXmlError = "$err at byte $position:\n$fragment";
 718                         xml_parser_free( $parser );
 719                         return false;
 720                 }
 721
 722                 xml_parser_free( $parser );
 723
 724                 return true;
 725         }
 726
 727         /**
 728          * Check if a string is a well-formed XML fragment.
 729          * Wraps fragment in an \<html\> bit and doctype, so it can be a fragment
 730          * and can use HTML named entities.
 731          *
 732          * @param string $text
 733          * @return bool
 734          */
 735         public static function isWellFormedXmlFragment( $text ) {
 736                 $html =
 737                         Sanitizer::hackDocType() .
 738                         '<html>' .
 739                         $text .
 740                         '</html>';
 741
 742                 return Xml::isWellFormed( $html );
 743         }
 744
 745         /**
 746          * Replace " > and < with their respective HTML entities ( &quot;,
 747          * &gt;, &lt;)
 748          *
 749          * @param string $in Text that might contain HTML tags.
 750          * @return string Escaped string
 751          */
 752         public static function escapeTagsOnly( $in ) {
 753                 return str_replace(
 754                         [ '"', '>', '<' ],
 755                         [ '&quot;', '&gt;', '&lt;' ],
 756                         $in );
 757         }
 758
 759         /**
 760          * Generate a form (without the opening form element).
 761          * Output optionally includes a submit button.
 762          * @param array $fields Associative array, key is the name of a message that
 763          *   contains a description for the field, value is an HTML string
 764          *   containing the appropriate input.
 765          * @param string $submitLabel The name of a message containing a label for
 766          *   the submit button.
 767          * @param array $submitAttribs The attributes to add to the submit button
 768          * @return string HTML form.
 769          */
 770         public static function buildForm( $fields, $submitLabel = null, $submitAttribs = [] ) {
 771                 $form = '';
 772                 $form .= "<table><tbody>";
 773
 774                 foreach ( $fields as $labelmsg => $input ) {
 775                         $id = "mw-$labelmsg";
 776                         $form .= Xml::openElement( 'tr', [ 'id' => $id ] );
 777
 778                         // TODO use a <label> here for accessibility purposes - will need
 779                         // to either not use a table to build the form, or find the ID of
 780                         // the input somehow.
 781
 782                         $form .= Xml::tags( 'td', [ 'class' => 'mw-label' ], wfMessage( $labelmsg )->parse() );
 783                         $form .= Xml::openElement( 'td', [ 'class' => 'mw-input' ] )
 784                                 . $input . Xml::closeElement( 'td' );
 785                         $form .= Xml::closeElement( 'tr' );
 786                 }
 787
 788                 if ( $submitLabel ) {
 789                         $form .= Xml::openElement( 'tr' );
 790                         $form .= Xml::tags( 'td', [], '' );
 791                         $form .= Xml::openElement( 'td', [ 'class' => 'mw-submit' ] )
 792                                 . Xml::submitButton( wfMessage( $submitLabel )->text(), $submitAttribs )
 793                                 . Xml::closeElement( 'td' );
 794                         $form .= Xml::closeElement( 'tr' );
 795                 }
 796
 797                 $form .= "</tbody></table>";
 798
 799                 return $form;
 800         }
 801
 802         /**
 803          * Build a table of data
 804          * @param array $rows An array of arrays of strings, each to be a row in a table
 805          * @param array $attribs An array of attributes to apply to the table tag [optional]
 806          * @param array $headers An array of strings to use as table headers [optional]
 807          * @return string
 808          */
 809         public static function buildTable( $rows, $attribs = [], $headers = null ) {
 810                 $s = Xml::openElement( 'table', $attribs );
 811
 812                 if ( is_array( $headers ) ) {
 813                         $s .= Xml::openElement( 'thead', $attribs );
 814
 815                         foreach ( $headers as $id => $header ) {
 816                                 $attribs = [];
 817
 818                                 if ( is_string( $id ) ) {
 819                                         $attribs['id'] = $id;
 820                                 }
 821
 822                                 $s .= Xml::element( 'th', $attribs, $header );
 823                         }
 824                         $s .= Xml::closeElement( 'thead' );
 825                 }
 826
 827                 foreach ( $rows as $id => $row ) {
 828                         $attribs = [];
 829
 830                         if ( is_string( $id ) ) {
 831                                 $attribs['id'] = $id;
 832                         }
 833
 834                         $s .= Xml::buildTableRow( $attribs, $row );
 835                 }
 836
 837                 $s .= Xml::closeElement( 'table' );
 838
 839                 return $s;
 840         }
 841
 842         /**
 843          * Build a row for a table
 844          * @param array $attribs An array of attributes to apply to the tr tag
 845          * @param array $cells An array of strings to put in <td>
 846          * @return string
 847          */
 848         public static function buildTableRow( $attribs, $cells ) {
 849                 $s = Xml::openElement( 'tr', $attribs );
 850
 851                 foreach ( $cells as $id => $cell ) {
 852                         $attribs = [];
 853
 854                         if ( is_string( $id ) ) {
 855                                 $attribs['id'] = $id;
 856                         }
 857
 858                         $s .= Xml::element( 'td', $attribs, $cell );
 859                 }
 860
 861                 $s .= Xml::closeElement( 'tr' );
 862
 863                 return $s;
 864         }
 865 }
 866
 867 /**
 868  * A wrapper class which causes Xml::encodeJsVar() and Xml::encodeJsCall() to
 869  * interpret a given string as being a JavaScript expression, instead of string
 870  * data.
 871  *
 872  * Example:
 873  *
 874  *    Xml::encodeJsVar( new XmlJsCode( 'a + b' ) );
 875  *
 876  * Returns "a + b".
 877  *
 878  * @note As of 1.21, XmlJsCode objects cannot be nested inside objects or arrays. The sole
 879  *       exception is the $args argument to Xml::encodeJsCall() because Xml::encodeJsVar() is
 880  *       called for each individual element in that array.
 881  *
 882  * @since 1.17
 883  */
 884 class XmlJsCode {
 885         public $value;
 886
 887         function __construct( $value ) {
 888                 $this->value = $value;
 889         }
 890 }