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          * Shortcut to make a span element
 245          * @param string $text Content of the element, will be escaped
 246          * @param string $class Class name of the span element
 247          * @param array $attribs Other attributes
 248          * @return string
 249          */
 250         public static function span( $text, $class, $attribs = [] ) {
 251                 return self::element( 'span', [ 'class' => $class ] + $attribs, $text );
 252         }
 253
 254         /**
 255          * Shortcut to make a specific element with a class attribute
 256          * @param string $text Content of the element, will be escaped
 257          * @param string $class Class name of the span element
 258          * @param string $tag Element name
 259          * @param array $attribs Other attributes
 260          * @return string
 261          */
 262         public static function wrapClass( $text, $class, $tag = 'span', $attribs = [] ) {
 263                 return self::tags( $tag, [ 'class' => $class ] + $attribs, $text );
 264         }
 265
 266         /**
 267          * Convenience function to build an HTML text input field
 268          * @param string $name Value of the name attribute
 269          * @param int $size Value of the size attribute
 270          * @param mixed $value Value of the value attribute
 271          * @param array $attribs Other attributes
 272          * @return string HTML
 273          */
 274         public static function input( $name, $size = false, $value = false, $attribs = [] ) {
 275                 $attributes = [ 'name' => $name ];
 276
 277                 if ( $size ) {
 278                         $attributes['size'] = $size;
 279                 }
 280
 281                 if ( $value !== false ) { // maybe 0
 282                         $attributes['value'] = $value;
 283                 }
 284
 285                 return self::element( 'input',
 286                         Html::getTextInputAttributes( $attributes + $attribs ) );
 287         }
 288
 289         /**
 290          * Convenience function to build an HTML password input field
 291          * @param string $name Value of the name attribute
 292          * @param int $size Value of the size attribute
 293          * @param mixed $value Value of the value attribute
 294          * @param array $attribs Other attributes
 295          * @return string HTML
 296          */
 297         public static function password( $name, $size = false, $value = false,
 298                 $attribs = []
 299         ) {
 300                 return self::input( $name, $size, $value,
 301                         array_merge( $attribs, [ 'type' => 'password' ] ) );
 302         }
 303
 304         /**
 305          * Internal function for use in checkboxes and radio buttons and such.
 306          *
 307          * @param string $name
 308          * @param bool $present
 309          *
 310          * @return array
 311          */
 312         public static function attrib( $name, $present = true ) {
 313                 return $present ? [ $name => $name ] : [];
 314         }
 315
 316         /**
 317          * Convenience function to build an HTML checkbox
 318          * @param string $name Value of the name attribute
 319          * @param bool $checked Whether the checkbox is checked or not
 320          * @param array $attribs Array other attributes
 321          * @return string HTML
 322          */
 323         public static function check( $name, $checked = false, $attribs = [] ) {
 324                 return self::element( 'input', array_merge(
 325                         [
 326                                 'name' => $name,
 327                                 'type' => 'checkbox',
 328                                 'value' => 1 ],
 329                         self::attrib( 'checked', $checked ),
 330                         $attribs ) );
 331         }
 332
 333         /**
 334          * Convenience function to build an HTML radio button
 335          * @param string $name Value of the name attribute
 336          * @param string $value Value of the value attribute
 337          * @param bool $checked Whether the checkbox is checked or not
 338          * @param array $attribs Other attributes
 339          * @return string HTML
 340          */
 341         public static function radio( $name, $value, $checked = false, $attribs = [] ) {
 342                 return self::element( 'input', [
 343                         'name' => $name,
 344                         'type' => 'radio',
 345                         'value' => $value ] + self::attrib( 'checked', $checked ) + $attribs );
 346         }
 347
 348         /**
 349          * Convenience function to build an HTML form label
 350          * @param string $label Text of the label
 351          * @param string $id
 352          * @param array $attribs An attribute array.  This will usually be
 353          *     the same array as is passed to the corresponding input element,
 354          *     so this function will cherry-pick appropriate attributes to
 355          *     apply to the label as well; only class and title are applied.
 356          * @return string HTML
 357          */
 358         public static function label( $label, $id, $attribs = [] ) {
 359                 $a = [ 'for' => $id ];
 360
 361                 foreach ( [ 'class', 'title' ] as $attr ) {
 362                         if ( isset( $attribs[$attr] ) ) {
 363                                 $a[$attr] = $attribs[$attr];
 364                         }
 365                 }
 366
 367                 return self::element( 'label', $a, $label );
 368         }
 369
 370         /**
 371          * Convenience function to build an HTML text input field with a label
 372          * @param string $label Text of the label
 373          * @param string $name Value of the name attribute
 374          * @param string $id Id of the input
 375          * @param int|bool $size Value of the size attribute
 376          * @param string|bool $value Value of the value attribute
 377          * @param array $attribs Other attributes
 378          * @return string HTML
 379          */
 380         public static function inputLabel( $label, $name, $id, $size = false,
 381                 $value = false, $attribs = []
 382         ) {
 383                 list( $label, $input ) = self::inputLabelSep( $label, $name, $id, $size, $value, $attribs );
 384                 return $label . '&#160;' . $input;
 385         }
 386
 387         /**
 388          * Same as Xml::inputLabel() but return input and label in an array
 389          *
 390          * @param string $label
 391          * @param string $name
 392          * @param string $id
 393          * @param int|bool $size
 394          * @param string|bool $value
 395          * @param array $attribs
 396          *
 397          * @return array
 398          */
 399         public static function inputLabelSep( $label, $name, $id, $size = false,
 400                 $value = false, $attribs = []
 401         ) {
 402                 return [
 403                         Xml::label( $label, $id, $attribs ),
 404                         self::input( $name, $size, $value, [ 'id' => $id ] + $attribs )
 405                 ];
 406         }
 407
 408         /**
 409          * Convenience function to build an HTML checkbox with a label
 410          *
 411          * @param string $label
 412          * @param string $name
 413          * @param string $id
 414          * @param bool $checked
 415          * @param array $attribs
 416          *
 417          * @return string HTML
 418          */
 419         public static function checkLabel( $label, $name, $id, $checked = false, $attribs = [] ) {
 420                 global $wgUseMediaWikiUIEverywhere;
 421                 $chkLabel = self::check( $name, $checked, [ 'id' => $id ] + $attribs ) .
 422                         '&#160;' .
 423                         self::label( $label, $id, $attribs );
 424
 425                 if ( $wgUseMediaWikiUIEverywhere ) {
 426                         $chkLabel = self::openElement( 'div', [ 'class' => 'mw-ui-checkbox' ] ) .
 427                                 $chkLabel . self::closeElement( 'div' );
 428                 }
 429                 return $chkLabel;
 430         }
 431
 432         /**
 433          * Convenience function to build an HTML radio button with a label
 434          *
 435          * @param string $label
 436          * @param string $name
 437          * @param string $value
 438          * @param string $id
 439          * @param bool $checked
 440          * @param array $attribs
 441          *
 442          * @return string HTML
 443          */
 444         public static function radioLabel( $label, $name, $value, $id,
 445                 $checked = false, $attribs = []
 446         ) {
 447                 return self::radio( $name, $value, $checked, [ 'id' => $id ] + $attribs ) .
 448                         '&#160;' .
 449                         self::label( $label, $id, $attribs );
 450         }
 451
 452         /**
 453          * Convenience function to build an HTML submit button
 454          * When $wgUseMediaWikiUIEverywhere is true it will default to a progressive button
 455          * @param string $value Label text for the button
 456          * @param array $attribs Optional custom attributes
 457          * @return string HTML
 458          */
 459         public static function submitButton( $value, $attribs = [] ) {
 460                 global $wgUseMediaWikiUIEverywhere;
 461                 $baseAttrs = [
 462                         'type' => 'submit',
 463                         'value' => $value,
 464                 ];
 465                 // Done conditionally for time being as it is possible
 466                 // some submit forms
 467                 // might need to be mw-ui-destructive (e.g. delete a page)
 468                 if ( $wgUseMediaWikiUIEverywhere ) {
 469                         $baseAttrs['class'] = 'mw-ui-button mw-ui-progressive';
 470                 }
 471                 // Any custom attributes will take precendence of anything in baseAttrs e.g. override the class
 472                 $attribs = $attribs + $baseAttrs;
 473                 return Html::element( 'input', $attribs );
 474         }
 475
 476         /**
 477          * Convenience function to build an HTML drop-down list item.
 478          * @param string $text Text for this item. Will be HTML escaped
 479          * @param string $value Form submission value; if empty, use text
 480          * @param bool $selected If true, will be the default selected item
 481          * @param array $attribs Optional additional HTML attributes
 482          * @return string HTML
 483          */
 484         public static function option( $text, $value = null, $selected = false,
 485                         $attribs = [] ) {
 486                 if ( !is_null( $value ) ) {
 487                         $attribs['value'] = $value;
 488                 }
 489                 if ( $selected ) {
 490                         $attribs['selected'] = 'selected';
 491                 }
 492                 return Html::element( 'option', $attribs, $text );
 493         }
 494
 495         /**
 496          * Build a drop-down box from a textual list.
 497          *
 498          * @param string $name Name and id for the drop-down
 499          * @param string $list Correctly formatted text (newline delimited) to be
 500          *   used to generate the options.
 501          * @param string $other Text for the "Other reasons" option
 502          * @param string $selected Option which should be pre-selected
 503          * @param string $class CSS classes for the drop-down
 504          * @param int $tabindex Value of the tabindex attribute
 505          * @return string
 506          */
 507         public static function listDropDown( $name = '', $list = '', $other = '',
 508                 $selected = '', $class = '', $tabindex = null
 509         ) {
 510                 $optgroup = false;
 511
 512                 $options = self::option( $other, 'other', $selected === 'other' );
 513
 514                 foreach ( explode( "\n", $list ) as $option ) {
 515                         $value = trim( $option );
 516                         if ( $value == '' ) {
 517                                 continue;
 518                         } elseif ( substr( $value, 0, 1 ) == '*' && substr( $value, 1, 1 ) != '*' ) {
 519                                 // A new group is starting ...
 520                                 $value = trim( substr( $value, 1 ) );
 521                                 if ( $optgroup ) {
 522                                         $options .= self::closeElement( 'optgroup' );
 523                                 }
 524                                 $options .= self::openElement( 'optgroup', [ 'label' => $value ] );
 525                                 $optgroup = true;
 526                         } elseif ( substr( $value, 0, 2 ) == '**' ) {
 527                                 // groupmember
 528                                 $value = trim( substr( $value, 2 ) );
 529                                 $options .= self::option( $value, $value, $selected === $value );
 530                         } else {
 531                                 // groupless reason list
 532                                 if ( $optgroup ) {
 533                                         $options .= self::closeElement( 'optgroup' );
 534                                 }
 535                                 $options .= self::option( $value, $value, $selected === $value );
 536                                 $optgroup = false;
 537                         }
 538                 }
 539
 540                 if ( $optgroup ) {
 541                         $options .= self::closeElement( 'optgroup' );
 542                 }
 543
 544                 $attribs = [];
 545
 546                 if ( $name ) {
 547                         $attribs['id'] = $name;
 548                         $attribs['name'] = $name;
 549                 }
 550
 551                 if ( $class ) {
 552                         $attribs['class'] = $class;
 553                 }
 554
 555                 if ( $tabindex ) {
 556                         $attribs['tabindex'] = $tabindex;
 557                 }
 558
 559                 return Xml::openElement( 'select', $attribs )
 560                         . "\n"
 561                         . $options
 562                         . "\n"
 563                         . Xml::closeElement( 'select' );
 564         }
 565
 566         /**
 567          * Shortcut for creating fieldsets.
 568          *
 569          * @param string|bool $legend Legend of the fieldset. If evaluates to false,
 570          *   legend is not added.
 571          * @param string $content Pre-escaped content for the fieldset. If false,
 572          *   only open fieldset is returned.
 573          * @param array $attribs Any attributes to fieldset-element.
 574          *
 575          * @return string
 576          */
 577         public static function fieldset( $legend = false, $content = false, $attribs = [] ) {
 578                 $s = Xml::openElement( 'fieldset', $attribs ) . "\n";
 579
 580                 if ( $legend ) {
 581                         $s .= Xml::element( 'legend', null, $legend ) . "\n";
 582                 }
 583
 584                 if ( $content !== false ) {
 585                         $s .= $content . "\n";
 586                         $s .= Xml::closeElement( 'fieldset' ) . "\n";
 587                 }
 588
 589                 return $s;
 590         }
 591
 592         /**
 593          * Shortcut for creating textareas.
 594          *
 595          * @param string $name The 'name' for the textarea
 596          * @param string $content Content for the textarea
 597          * @param int $cols The number of columns for the textarea
 598          * @param int $rows The number of rows for the textarea
 599          * @param array $attribs Any other attributes for the textarea
 600          *
 601          * @return string
 602          */
 603         public static function textarea( $name, $content, $cols = 40, $rows = 5, $attribs = [] ) {
 604                 return self::element( 'textarea',
 605                                         Html::getTextInputAttributes(
 606                                                 [
 607                                                         'name' => $name,
 608                                                         'id' => $name,
 609                                                         'cols' => $cols,
 610                                                         'rows' => $rows
 611                                                 ] + $attribs
 612                                         ),
 613                                         $content, false );
 614         }
 615
 616         /**
 617          * Encode a variable of arbitrary type to JavaScript.
 618          * If the value is an XmlJsCode object, pass through the object's value verbatim.
 619          *
 620          * @note Only use this function for generating JavaScript code. If generating output
 621          *       for a proper JSON parser, just call FormatJson::encode() directly.
 622          *
 623          * @param mixed $value The value being encoded. Can be any type except a resource.
 624          * @param bool $pretty If true, add non-significant whitespace to improve readability.
 625          * @return string|bool String if successful; false upon failure
 626          */
 627         public static function encodeJsVar( $value, $pretty = false ) {
 628                 if ( $value instanceof XmlJsCode ) {
 629                         return $value->value;
 630                 }
 631                 return FormatJson::encode( $value, $pretty, FormatJson::UTF8_OK );
 632         }
 633
 634         /**
 635          * Create a call to a JavaScript function. The supplied arguments will be
 636          * encoded using Xml::encodeJsVar().
 637          *
 638          * @since 1.17
 639          * @param string $name The name of the function to call, or a JavaScript expression
 640          *    which evaluates to a function object which is called.
 641          * @param array $args The arguments to pass to the function.
 642          * @param bool $pretty If true, add non-significant whitespace to improve readability.
 643          * @return string|bool String if successful; false upon failure
 644          */
 645         public static function encodeJsCall( $name, $args, $pretty = false ) {
 646                 foreach ( $args as &$arg ) {
 647                         $arg = Xml::encodeJsVar( $arg, $pretty );
 648                         if ( $arg === false ) {
 649                                 return false;
 650                         }
 651                 }
 652
 653                 return "$name(" . ( $pretty
 654                         ? ( ' ' . implode( ', ', $args ) . ' ' )
 655                         : implode( ',', $args )
 656                 ) . ");";
 657         }
 658
 659         /**
 660          * Check if a string is well-formed XML.
 661          * Must include the surrounding tag.
 662          * This function is a DoS vector if an attacker can define
 663          * entities in $text.
 664          *
 665          * @param string $text String to test.
 666          * @return bool
 667          *
 668          * @todo Error position reporting return
 669          */
 670         private static function isWellFormed( $text ) {
 671                 $parser = xml_parser_create( "UTF-8" );
 672
 673                 # case folding violates XML standard, turn it off
 674                 xml_parser_set_option( $parser, XML_OPTION_CASE_FOLDING, false );
 675
 676                 if ( !xml_parse( $parser, $text, true ) ) {
 677                         // $err = xml_error_string( xml_get_error_code( $parser ) );
 678                         // $position = xml_get_current_byte_index( $parser );
 679                         // $fragment = $this->extractFragment( $html, $position );
 680                         // $this->mXmlError = "$err at byte $position:\n$fragment";
 681                         xml_parser_free( $parser );
 682                         return false;
 683                 }
 684
 685                 xml_parser_free( $parser );
 686
 687                 return true;
 688         }
 689
 690         /**
 691          * Check if a string is a well-formed XML fragment.
 692          * Wraps fragment in an \<html\> bit and doctype, so it can be a fragment
 693          * and can use HTML named entities.
 694          *
 695          * @param string $text
 696          * @return bool
 697          */
 698         public static function isWellFormedXmlFragment( $text ) {
 699                 $html =
 700                         Sanitizer::hackDocType() .
 701                         '<html>' .
 702                         $text .
 703                         '</html>';
 704
 705                 return Xml::isWellFormed( $html );
 706         }
 707
 708         /**
 709          * Replace " > and < with their respective HTML entities ( &quot;,
 710          * &gt;, &lt;)
 711          *
 712          * @param string $in Text that might contain HTML tags.
 713          * @return string Escaped string
 714          */
 715         public static function escapeTagsOnly( $in ) {
 716                 return str_replace(
 717                         [ '"', '>', '<' ],
 718                         [ '&quot;', '&gt;', '&lt;' ],
 719                         $in );
 720         }
 721
 722         /**
 723          * Generate a form (without the opening form element).
 724          * Output optionally includes a submit button.
 725          * @param array $fields Associative array, key is the name of a message that
 726          *   contains a description for the field, value is an HTML string
 727          *   containing the appropriate input.
 728          * @param string $submitLabel The name of a message containing a label for
 729          *   the submit button.
 730          * @param array $submitAttribs The attributes to add to the submit button
 731          * @return string HTML form.
 732          */
 733         public static function buildForm( $fields, $submitLabel = null, $submitAttribs = [] ) {
 734                 $form = '';
 735                 $form .= "<table><tbody>";
 736
 737                 foreach ( $fields as $labelmsg => $input ) {
 738                         $id = "mw-$labelmsg";
 739                         $form .= Xml::openElement( 'tr', [ 'id' => $id ] );
 740
 741                         // TODO use a <label> here for accessibility purposes - will need
 742                         // to either not use a table to build the form, or find the ID of
 743                         // the input somehow.
 744
 745                         $form .= Xml::tags( 'td', [ 'class' => 'mw-label' ], wfMessage( $labelmsg )->parse() );
 746                         $form .= Xml::openElement( 'td', [ 'class' => 'mw-input' ] )
 747                                 . $input . Xml::closeElement( 'td' );
 748                         $form .= Xml::closeElement( 'tr' );
 749                 }
 750
 751                 if ( $submitLabel ) {
 752                         $form .= Xml::openElement( 'tr' );
 753                         $form .= Xml::tags( 'td', [], '' );
 754                         $form .= Xml::openElement( 'td', [ 'class' => 'mw-submit' ] )
 755                                 . Xml::submitButton( wfMessage( $submitLabel )->text(), $submitAttribs )
 756                                 . Xml::closeElement( 'td' );
 757                         $form .= Xml::closeElement( 'tr' );
 758                 }
 759
 760                 $form .= "</tbody></table>";
 761
 762                 return $form;
 763         }
 764
 765         /**
 766          * Build a table of data
 767          * @param array $rows An array of arrays of strings, each to be a row in a table
 768          * @param array $attribs An array of attributes to apply to the table tag [optional]
 769          * @param array $headers An array of strings to use as table headers [optional]
 770          * @return string
 771          */
 772         public static function buildTable( $rows, $attribs = [], $headers = null ) {
 773                 $s = Xml::openElement( 'table', $attribs );
 774
 775                 if ( is_array( $headers ) ) {
 776                         $s .= Xml::openElement( 'thead', $attribs );
 777
 778                         foreach ( $headers as $id => $header ) {
 779                                 $attribs = [];
 780
 781                                 if ( is_string( $id ) ) {
 782                                         $attribs['id'] = $id;
 783                                 }
 784
 785                                 $s .= Xml::element( 'th', $attribs, $header );
 786                         }
 787                         $s .= Xml::closeElement( 'thead' );
 788                 }
 789
 790                 foreach ( $rows as $id => $row ) {
 791                         $attribs = [];
 792
 793                         if ( is_string( $id ) ) {
 794                                 $attribs['id'] = $id;
 795                         }
 796
 797                         $s .= Xml::buildTableRow( $attribs, $row );
 798                 }
 799
 800                 $s .= Xml::closeElement( 'table' );
 801
 802                 return $s;
 803         }
 804
 805         /**
 806          * Build a row for a table
 807          * @param array $attribs An array of attributes to apply to the tr tag
 808          * @param array $cells An array of strings to put in <td>
 809          * @return string
 810          */
 811         public static function buildTableRow( $attribs, $cells ) {
 812                 $s = Xml::openElement( 'tr', $attribs );
 813
 814                 foreach ( $cells as $id => $cell ) {
 815                         $attribs = [];
 816
 817                         if ( is_string( $id ) ) {
 818                                 $attribs['id'] = $id;
 819                         }
 820
 821                         $s .= Xml::element( 'td', $attribs, $cell );
 822                 }
 823
 824                 $s .= Xml::closeElement( 'tr' );
 825
 826                 return $s;
 827         }
 828 }
 829
 830 /**
 831  * A wrapper class which causes Xml::encodeJsVar() and Xml::encodeJsCall() to
 832  * interpret a given string as being a JavaScript expression, instead of string
 833  * data.
 834  *
 835  * Example:
 836  *
 837  *    Xml::encodeJsVar( new XmlJsCode( 'a + b' ) );
 838  *
 839  * Returns "a + b".
 840  *
 841  * @note As of 1.21, XmlJsCode objects cannot be nested inside objects or arrays. The sole
 842  *       exception is the $args argument to Xml::encodeJsCall() because Xml::encodeJsVar() is
 843  *       called for each individual element in that array.
 844  *
 845  * @since 1.17
 846  */
 847 class XmlJsCode {
 848         public $value;
 849
 850         function __construct( $value ) {
 851                 $this->value = $value;
 852         }
 853 }