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 = '', $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 array $attribs 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 array $attribs Name=>value pairs. Values will be escaped.
  86          * @param string $contents 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 string $element name of the element
 106          * @param array $attribs 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 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          * Build a drop-down box for selecting a namespace
 137          *
 138          * @param $selected Mixed: Namespace which should be pre-selected
 139          * @param $all Mixed: Value of an item denoting all namespaces, or null to omit
 140          * @param $element_name String: value of the "name" attribute of the select tag
 141          * @param string $label optional label to add to the field
 142          * @return string
 143          * @deprecated since 1.19
 144          */
 145         public static function namespaceSelector( $selected = '', $all = null, $element_name = 'namespace', $label = null ) {
 146                 wfDeprecated( __METHOD__, '1.19' );
 147                 return Html::namespaceSelector( array(
 148                         'selected' => $selected,
 149                         'all' => $all,
 150                         'label' => $label,
 151                 ), array(
 152                         'name' => $element_name,
 153                         'id' => 'namespace',
 154                         'class' => 'namespaceselector',
 155                 ) );
 156         }
 157
 158         /**
 159          * Create a date selector
 160          *
 161          * @param $selected Mixed: the month which should be selected, default ''
 162          * @param string $allmonths value of a special item denoting all month. Null to not include (default)
 163          * @param string $id Element identifier
 164          * @return String: Html string containing the month selector
 165          */
 166         public static function monthSelector( $selected = '', $allmonths = null, $id = 'month' ) {
 167                 global $wgLang;
 168                 $options = array();
 169                 if ( is_null( $selected ) ) {
 170                         $selected = '';
 171                 }
 172                 if ( !is_null( $allmonths ) ) {
 173                         $options[] = self::option( wfMessage( 'monthsall' )->text(), $allmonths, $selected === $allmonths );
 174                 }
 175                 for ( $i = 1; $i < 13; $i++ ) {
 176                         $options[] = self::option( $wgLang->getMonthName( $i ), $i, $selected === $i );
 177                 }
 178                 return self::openElement( 'select', array( 'id' => $id, 'name' => 'month', 'class' => 'mw-month-selector' ) )
 179                         . implode( "\n", $options )
 180                         . self::closeElement( 'select' );
 181         }
 182
 183         /**
 184          * @param $year Integer
 185          * @param $month Integer
 186          * @return string Formatted HTML
 187          */
 188         public static function dateMenu( $year, $month ) {
 189                 # Offset overrides year/month selection
 190                 if ( $month && $month !== -1 ) {
 191                         $encMonth = intval( $month );
 192                 } else {
 193                         $encMonth = '';
 194                 }
 195                 if ( $year ) {
 196                         $encYear = intval( $year );
 197                 } elseif ( $encMonth ) {
 198                         $thisMonth = intval( gmdate( 'n' ) );
 199                         $thisYear = intval( gmdate( 'Y' ) );
 200                         if ( intval( $encMonth ) > $thisMonth ) {
 201                                 $thisYear--;
 202                         }
 203                         $encYear = $thisYear;
 204                 } else {
 205                         $encYear = '';
 206                 }
 207                 $inputAttribs = array( 'id' => 'year', 'maxlength' => 4, 'size' => 7 );
 208                 return self::label( wfMessage( 'year' )->text(), 'year' ) . ' ' .
 209                         Html::input( 'year', $encYear, 'number', $inputAttribs ) . ' ' .
 210                         self::label( wfMessage( 'month' )->text(), 'month' ) . ' ' .
 211                         self::monthSelector( $encMonth, -1 );
 212         }
 213
 214         /**
 215          * Construct a language selector appropriate for use in a form or preferences
 216          *
 217          * @param string $selected The language code of the selected language
 218          * @param boolean $customisedOnly If true only languages which have some content are listed
 219          * @param string $inLanguage The ISO code of the language to display the select list in (optional)
 220          * @param array $overrideAttrs Override the attributes of the select tag (since 1.20)
 221          * @param Message|null $msg Label message key (since 1.20)
 222          * @return array containing 2 items: label HTML and select list HTML
 223          */
 224         public static function languageSelector( $selected, $customisedOnly = true, $inLanguage = null, $overrideAttrs = array(), Message $msg = null ) {
 225                 global $wgLanguageCode;
 226
 227                 $include = $customisedOnly ? 'mwfile' : 'mw';
 228                 $languages = Language::fetchLanguageNames( $inLanguage, $include );
 229
 230                 // Make sure the site language is in the list;
 231                 // a custom language code might not have a defined name...
 232                 if ( !array_key_exists( $wgLanguageCode, $languages ) ) {
 233                         $languages[$wgLanguageCode] = $wgLanguageCode;
 234                 }
 235
 236                 ksort( $languages );
 237
 238                 /**
 239                  * If a bogus value is set, default to the content language.
 240                  * Otherwise, no default is selected and the user ends up
 241                  * with Afrikaans since it's first in the list.
 242                  */
 243                 $selected = isset( $languages[$selected] ) ? $selected : $wgLanguageCode;
 244                 $options = "\n";
 245                 foreach ( $languages as $code => $name ) {
 246                         $options .= Xml::option( "$code - $name", $code, $code == $selected ) . "\n";
 247                 }
 248
 249                 $attrs = array( 'id' => 'wpUserLanguage', 'name' => 'wpUserLanguage' );
 250                 $attrs = array_merge( $attrs, $overrideAttrs );
 251
 252                 if ( $msg === null ) {
 253                         $msg = wfMessage( 'yourlanguage' );
 254                 }
 255                 return array(
 256                         Xml::label( $msg->text(), $attrs['id'] ),
 257                         Xml::tags( 'select', $attrs, $options )
 258                 );
 259
 260         }
 261
 262         /**
 263          * Shortcut to make a span element
 264          * @param string $text content of the element, will be escaped
 265          * @param string $class class name of the span element
 266          * @param array $attribs other attributes
 267          * @return string
 268          */
 269         public static function span( $text, $class, $attribs = array() ) {
 270                 return self::element( 'span', array( 'class' => $class ) + $attribs, $text );
 271         }
 272
 273         /**
 274          * Shortcut to make a specific element with a class attribute
 275          * @param string $text content of the element, will be escaped
 276          * @param string $class class name of the span element
 277          * @param string $tag element name
 278          * @param array $attribs other attributes
 279          * @return string
 280          */
 281         public static function wrapClass( $text, $class, $tag = 'span', $attribs = array() ) {
 282                 return self::tags( $tag, array( 'class' => $class ) + $attribs, $text );
 283         }
 284
 285         /**
 286          * Convenience function to build an HTML text input field
 287          * @param string $name value of the name attribute
 288          * @param int $size value of the size attribute
 289          * @param $value mixed value of the value attribute
 290          * @param array $attribs other attributes
 291          * @return string HTML
 292          */
 293         public static function input( $name, $size = false, $value = false, $attribs = array() ) {
 294                 $attributes = array( 'name' => $name );
 295
 296                 if ( $size ) {
 297                         $attributes['size'] = $size;
 298                 }
 299
 300                 if ( $value !== false ) { // maybe 0
 301                         $attributes['value'] = $value;
 302                 }
 303
 304                 return self::element( 'input', $attributes + $attribs );
 305         }
 306
 307         /**
 308          * Convenience function to build an HTML password input field
 309          * @param string $name value of the name attribute
 310          * @param int $size value of the size attribute
 311          * @param $value mixed value of the value attribute
 312          * @param array $attribs other attributes
 313          * @return string HTML
 314          */
 315         public static function password( $name, $size = false, $value = false, $attribs = array() ) {
 316                 return self::input( $name, $size, $value, array_merge( $attribs, array( 'type' => 'password' ) ) );
 317         }
 318
 319         /**
 320          * Internal function for use in checkboxes and radio buttons and such.
 321          *
 322          * @param $name string
 323          * @param $present bool
 324          *
 325          * @return array
 326          */
 327         public static function attrib( $name, $present = true ) {
 328                 return $present ? array( $name => $name ) : array();
 329         }
 330
 331         /**
 332          * Convenience function to build an HTML checkbox
 333          * @param string $name value of the name attribute
 334          * @param bool $checked Whether the checkbox is checked or not
 335          * @param array $attribs other attributes
 336          * @return string HTML
 337          */
 338         public static function check( $name, $checked = false, $attribs = array() ) {
 339                 return self::element( 'input', array_merge(
 340                         array(
 341                                 'name' => $name,
 342                                 'type' => 'checkbox',
 343                                 'value' => 1 ),
 344                         self::attrib( 'checked', $checked ),
 345                         $attribs ) );
 346         }
 347
 348         /**
 349          * Convenience function to build an HTML radio button
 350          * @param string $name value of the name attribute
 351          * @param string $value value of the value attribute
 352          * @param bool $checked Whether the checkbox is checked or not
 353          * @param array $attribs other attributes
 354          * @return string HTML
 355          */
 356         public static function radio( $name, $value, $checked = false, $attribs = array() ) {
 357                 return self::element( 'input', array(
 358                         'name' => $name,
 359                         'type' => 'radio',
 360                         'value' => $value ) + self::attrib( 'checked', $checked ) + $attribs );
 361         }
 362
 363         /**
 364          * Convenience function to build an HTML form label
 365          * @param string $label text of the label
 366          * @param $id
 367          * @param array $attribs an attribute array.  This will usually be
 368          *     the same array as is passed to the corresponding input element,
 369          *     so this function will cherry-pick appropriate attributes to
 370          *     apply to the label as well; only class and title are applied.
 371          * @return string HTML
 372          */
 373         public static function label( $label, $id, $attribs = array() ) {
 374                 $a = array( 'for' => $id );
 375
 376                 # FIXME avoid copy pasting below:
 377                 if ( isset( $attribs['class'] ) ) {
 378                                 $a['class'] = $attribs['class'];
 379                 }
 380                 if ( isset( $attribs['title'] ) ) {
 381                                 $a['title'] = $attribs['title'];
 382                 }
 383
 384                 return self::element( 'label', $a, $label );
 385         }
 386
 387         /**
 388          * Convenience function to build an HTML text input field with a label
 389          * @param string $label text of the label
 390          * @param string $name value of the name attribute
 391          * @param string $id id of the input
 392          * @param int|Bool $size value of the size attribute
 393          * @param string|Bool $value value of the value attribute
 394          * @param array $attribs other attributes
 395          * @return string HTML
 396          */
 397         public static function inputLabel( $label, $name, $id, $size = false, $value = false, $attribs = array() ) {
 398                 list( $label, $input ) = self::inputLabelSep( $label, $name, $id, $size, $value, $attribs );
 399                 return $label . '&#160;' . $input;
 400         }
 401
 402         /**
 403          * Same as Xml::inputLabel() but return input and label in an array
 404          *
 405          * @param $label String
 406          * @param $name String
 407          * @param $id String
 408          * @param $size Int|Bool
 409          * @param $value String|Bool
 410          * @param $attribs array
 411          *
 412          * @return array
 413          */
 414         public static function inputLabelSep( $label, $name, $id, $size = false, $value = false, $attribs = array() ) {
 415                 return array(
 416                         Xml::label( $label, $id, $attribs ),
 417                         self::input( $name, $size, $value, array( 'id' => $id ) + $attribs )
 418                 );
 419         }
 420
 421         /**
 422          * Convenience function to build an HTML checkbox with a label
 423          *
 424          * @param $label
 425          * @param $name
 426          * @param $id
 427          * @param $checked bool
 428          * @param $attribs array
 429          *
 430          * @return string HTML
 431          */
 432         public static function checkLabel( $label, $name, $id, $checked = false, $attribs = array() ) {
 433                 return self::check( $name, $checked, array( 'id' => $id ) + $attribs ) .
 434                         '&#160;' .
 435                         self::label( $label, $id, $attribs );
 436         }
 437
 438         /**
 439          * Convenience function to build an HTML radio button with a label
 440          *
 441          * @param $label
 442          * @param $name
 443          * @param $value
 444          * @param $id
 445          * @param $checked bool
 446          * @param $attribs array
 447          *
 448          * @return string HTML
 449          */
 450         public static function radioLabel( $label, $name, $value, $id, $checked = false, $attribs = array() ) {
 451                 return self::radio( $name, $value, $checked, array( 'id' => $id ) + $attribs ) .
 452                         '&#160;' .
 453                         self::label( $label, $id, $attribs );
 454         }
 455
 456         /**
 457          * Convenience function to build an HTML submit button
 458          * @param string $value label text for the button
 459          * @param array $attribs optional custom attributes
 460          * @return string HTML
 461          */
 462         public static function submitButton( $value, $attribs = array() ) {
 463                 return Html::element( 'input', array( 'type' => 'submit', 'value' => $value ) + $attribs );
 464         }
 465
 466         /**
 467          * Convenience function to build an HTML drop-down list item.
 468          * @param string $text text for this item. Will be HTML escaped
 469          * @param string $value form submission value; if empty, use text
 470          * @param $selected boolean: if true, will be the default selected item
 471          * @param array $attribs optional additional HTML attributes
 472          * @return string HTML
 473          */
 474         public static function option( $text, $value = null, $selected = false,
 475                         $attribs = array() ) {
 476                 if ( !is_null( $value ) ) {
 477                         $attribs['value'] = $value;
 478                 }
 479                 if ( $selected ) {
 480                         $attribs['selected'] = 'selected';
 481                 }
 482                 return Html::element( 'option', $attribs, $text );
 483         }
 484
 485         /**
 486          * Build a drop-down box from a textual list.
 487          *
 488          * @param $name Mixed: Name and id for the drop-down
 489          * @param $list Mixed: Correctly formatted text (newline delimited) to be used to generate the options
 490          * @param $other Mixed: Text for the "Other reasons" option
 491          * @param $selected Mixed: Option which should be pre-selected
 492          * @param $class Mixed: CSS classes for the drop-down
 493          * @param $tabindex Mixed: Value of the tabindex attribute
 494          * @return string
 495          */
 496         public static function listDropDown( $name = '', $list = '', $other = '', $selected = '', $class = '', $tabindex = null ) {
 497                 $optgroup = false;
 498
 499                 $options = self::option( $other, 'other', $selected === 'other' );
 500
 501                 foreach ( explode( "\n", $list ) as $option ) {
 502                                 $value = trim( $option );
 503                                 if ( $value == '' ) {
 504                                         continue;
 505                                 } elseif ( substr( $value, 0, 1 ) == '*' && substr( $value, 1, 1 ) != '*' ) {
 506                                         // A new group is starting ...
 507                                         $value = trim( substr( $value, 1 ) );
 508                                         if ( $optgroup ) {
 509                                                 $options .= self::closeElement( 'optgroup' );
 510                                         }
 511                                         $options .= self::openElement( 'optgroup', array( 'label' => $value ) );
 512                                         $optgroup = true;
 513                                 } elseif ( substr( $value, 0, 2 ) == '**' ) {
 514                                         // groupmember
 515                                         $value = trim( substr( $value, 2 ) );
 516                                         $options .= self::option( $value, $value, $selected === $value );
 517                                 } else {
 518                                         // groupless reason list
 519                                         if ( $optgroup ) {
 520                                                 $options .= self::closeElement( 'optgroup' );
 521                                         }
 522                                         $options .= self::option( $value, $value, $selected === $value );
 523                                         $optgroup = false;
 524                                 }
 525                         }
 526
 527                         if ( $optgroup ) {
 528                                 $options .= self::closeElement( 'optgroup' );
 529                         }
 530
 531                 $attribs = array();
 532
 533                 if ( $name ) {
 534                         $attribs['id'] = $name;
 535                         $attribs['name'] = $name;
 536                 }
 537
 538                 if ( $class ) {
 539                         $attribs['class'] = $class;
 540                 }
 541
 542                 if ( $tabindex ) {
 543                         $attribs['tabindex'] = $tabindex;
 544                 }
 545
 546                 return Xml::openElement( 'select', $attribs )
 547                         . "\n"
 548                         . $options
 549                         . "\n"
 550                         . Xml::closeElement( 'select' );
 551         }
 552
 553         /**
 554          * Shortcut for creating fieldsets.
 555          *
 556          * @param string|bool $legend Legend of the fieldset. If evaluates to false, legend is not added.
 557          * @param string $content Pre-escaped content for the fieldset. If false, only open fieldset is returned.
 558          * @param array $attribs Any attributes to fieldset-element.
 559          *
 560          * @return string
 561          */
 562         public static function fieldset( $legend = false, $content = false, $attribs = array() ) {
 563                 $s = Xml::openElement( 'fieldset', $attribs ) . "\n";
 564
 565                 if ( $legend ) {
 566                         $s .= Xml::element( 'legend', null, $legend ) . "\n";
 567                 }
 568
 569                 if ( $content !== false ) {
 570                         $s .= $content . "\n";
 571                         $s .= Xml::closeElement( 'fieldset' ) . "\n";
 572                 }
 573
 574                 return $s;
 575         }
 576
 577         /**
 578          * Shortcut for creating textareas.
 579          *
 580          * @param string $name The 'name' for the textarea
 581          * @param string $content Content for the textarea
 582          * @param int $cols The number of columns for the textarea
 583          * @param int $rows The number of rows for the textarea
 584          * @param array $attribs Any other attributes for the textarea
 585          *
 586          * @return string
 587          */
 588         public static function textarea( $name, $content, $cols = 40, $rows = 5, $attribs = array() ) {
 589                 return self::element( 'textarea',
 590                                         array(
 591                                                 'name' => $name,
 592                                                 'id' => $name,
 593                                                 'cols' => $cols,
 594                                                 'rows' => $rows
 595                                         ) + $attribs,
 596                                         $content, false );
 597         }
 598
 599         /**
 600          * Returns an escaped string suitable for inclusion in a string literal
 601          * for JavaScript source code.
 602          * Illegal control characters are assumed not to be present.
 603          *
 604          * @deprecated since 1.21; use Xml::encodeJsVar() or Xml::encodeJsCall() instead
 605          * @param string $string to escape
 606          * @return String
 607          */
 608         public static function escapeJsString( $string ) {
 609                 // See ECMA 262 section 7.8.4 for string literal format
 610                 $pairs = array(
 611                         "\\" => "\\\\",
 612                         "\"" => "\\\"",
 613                         '\'' => '\\\'',
 614                         "\n" => "\\n",
 615                         "\r" => "\\r",
 616
 617                         # To avoid closing the element or CDATA section
 618                         "<" => "\\x3c",
 619                         ">" => "\\x3e",
 620
 621                         # To avoid any complaints about bad entity refs
 622                         "&" => "\\x26",
 623
 624                         # Work around https://bugzilla.mozilla.org/show_bug.cgi?id=274152
 625                         # Encode certain Unicode formatting chars so affected
 626                         # versions of Gecko don't misinterpret our strings;
 627                         # this is a common problem with Farsi text.
 628                         "\xe2\x80\x8c" => "\\u200c", // ZERO WIDTH NON-JOINER
 629                         "\xe2\x80\x8d" => "\\u200d", // ZERO WIDTH JOINER
 630                 );
 631
 632                 return strtr( $string, $pairs );
 633         }
 634
 635         /**
 636          * Encode a variable of arbitrary type to JavaScript.
 637          * If the value is an XmlJsCode object, pass through the object's value verbatim.
 638          *
 639          * @note Only use this function for generating JavaScript code. If generating output
 640          *       for a proper JSON parser, just call FormatJson::encode() directly.
 641          *
 642          * @param mixed $value The value being encoded. Can be any type except a resource.
 643          * @param bool $pretty If true, add non-significant whitespace to improve readability.
 644          * @return string|bool: String if successful; false upon failure
 645          */
 646         public static function encodeJsVar( $value, $pretty = false ) {
 647                 if ( $value instanceof XmlJsCode ) {
 648                         return $value->value;
 649                 }
 650                 return FormatJson::encode( $value, $pretty, FormatJson::UTF8_OK );
 651         }
 652
 653         /**
 654          * Create a call to a JavaScript function. The supplied arguments will be
 655          * encoded using Xml::encodeJsVar().
 656          *
 657          * @since 1.17
 658          * @param string $name The name of the function to call, or a JavaScript expression
 659          *    which evaluates to a function object which is called.
 660          * @param array $args The arguments to pass to the function.
 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 encodeJsCall( $name, $args, $pretty = false ) {
 665                 foreach ( $args as &$arg ) {
 666                         $arg = Xml::encodeJsVar( $arg, $pretty );
 667                         if ( $arg === false ) {
 668                                 return false;
 669                         }
 670                 }
 671
 672                 return "$name(" . ( $pretty
 673                         ? ( ' ' . implode( ', ', $args ) . ' ' )
 674                         : implode( ',', $args )
 675                 ) . ");";
 676         }
 677
 678         /**
 679          * Check if a string is well-formed XML.
 680          * Must include the surrounding tag.
 681          *
 682          * @param string $text string to test.
 683          * @return bool
 684          *
 685          * @todo Error position reporting return
 686          */
 687         public static function isWellFormed( $text ) {
 688                 $parser = xml_parser_create( "UTF-8" );
 689
 690                 # case folding violates XML standard, turn it off
 691                 xml_parser_set_option( $parser, XML_OPTION_CASE_FOLDING, false );
 692
 693                 if ( !xml_parse( $parser, $text, true ) ) {
 694                         //$err = xml_error_string( xml_get_error_code( $parser ) );
 695                         //$position = xml_get_current_byte_index( $parser );
 696                         //$fragment = $this->extractFragment( $html, $position );
 697                         //$this->mXmlError = "$err at byte $position:\n$fragment";
 698                         xml_parser_free( $parser );
 699                         return false;
 700                 }
 701
 702                 xml_parser_free( $parser );
 703
 704                 return true;
 705         }
 706
 707         /**
 708          * Check if a string is a well-formed XML fragment.
 709          * Wraps fragment in an \<html\> bit and doctype, so it can be a fragment
 710          * and can use HTML named entities.
 711          *
 712          * @param $text String:
 713          * @return bool
 714          */
 715         public static function isWellFormedXmlFragment( $text ) {
 716                 $html =
 717                         Sanitizer::hackDocType() .
 718                         '<html>' .
 719                         $text .
 720                         '</html>';
 721
 722                 return Xml::isWellFormed( $html );
 723         }
 724
 725         /**
 726          * Replace " > and < with their respective HTML entities ( &quot;,
 727          * &gt;, &lt;)
 728          *
 729          * @param string $in text that might contain HTML tags.
 730          * @return string Escaped string
 731          */
 732         public static function escapeTagsOnly( $in ) {
 733                 return str_replace(
 734                         array( '"', '>', '<' ),
 735                         array( '&quot;', '&gt;', '&lt;' ),
 736                         $in );
 737         }
 738
 739         /**
 740          * Generate a form (without the opening form element).
 741          * Output optionally includes a submit button.
 742          * @param array $fields Associative array, key is the name of a message that contains a description for the field, value is an HTML string containing the appropriate input.
 743          * @param string $submitLabel The name of a message containing a label for the submit button.
 744          * @return string HTML form.
 745          */
 746         public static function buildForm( $fields, $submitLabel = null ) {
 747                 $form = '';
 748                 $form .= "<table><tbody>";
 749
 750                 foreach ( $fields as $labelmsg => $input ) {
 751                         $id = "mw-$labelmsg";
 752                         $form .= Xml::openElement( 'tr', array( 'id' => $id ) );
 753
 754                         // TODO use a <label> here for accessibility purposes - will need
 755                         // to either not use a table to build the form, or find the ID of
 756                         // the input somehow.
 757
 758                         $form .= Xml::tags( 'td', array( 'class' => 'mw-label' ), wfMessage( $labelmsg )->parse() );
 759                         $form .= Xml::openElement( 'td', array( 'class' => 'mw-input' ) ) . $input . Xml::closeElement( 'td' );
 760                         $form .= Xml::closeElement( 'tr' );
 761                 }
 762
 763                 if ( $submitLabel ) {
 764                         $form .= Xml::openElement( 'tr' );
 765                         $form .= Xml::tags( 'td', array(), '' );
 766                         $form .= Xml::openElement( 'td', array( 'class' => 'mw-submit' ) ) . Xml::submitButton( wfMessage( $submitLabel )->text() ) . Xml::closeElement( 'td' );
 767                         $form .= Xml::closeElement( 'tr' );
 768                 }
 769
 770                 $form .= "</tbody></table>";
 771
 772                 return $form;
 773         }
 774
 775         /**
 776          * Build a table of data
 777          * @param array $rows An array of arrays of strings, each to be a row in a table
 778          * @param array $attribs An array of attributes to apply to the table tag [optional]
 779          * @param array $headers An array of strings to use as table headers [optional]
 780          * @return string
 781          */
 782         public static function buildTable( $rows, $attribs = array(), $headers = null ) {
 783                 $s = Xml::openElement( 'table', $attribs );
 784
 785                 if ( is_array( $headers ) ) {
 786                         $s .= Xml::openElement( 'thead', $attribs );
 787
 788                         foreach ( $headers as $id => $header ) {
 789                                 $attribs = array();
 790
 791                                 if ( is_string( $id ) ) {
 792                                         $attribs['id'] = $id;
 793                                 }
 794
 795                                 $s .= Xml::element( 'th', $attribs, $header );
 796                         }
 797                         $s .= Xml::closeElement( 'thead' );
 798                 }
 799
 800                 foreach ( $rows as $id => $row ) {
 801                         $attribs = array();
 802
 803                         if ( is_string( $id ) ) {
 804                                 $attribs['id'] = $id;
 805                         }
 806
 807                         $s .= Xml::buildTableRow( $attribs, $row );
 808                 }
 809
 810                 $s .= Xml::closeElement( 'table' );
 811
 812                 return $s;
 813         }
 814
 815         /**
 816          * Build a row for a table
 817          * @param array $attribs An array of attributes to apply to the tr tag
 818          * @param array $cells An array of strings to put in <td>
 819          * @return string
 820          */
 821         public static function buildTableRow( $attribs, $cells ) {
 822                 $s = Xml::openElement( 'tr', $attribs );
 823
 824                 foreach ( $cells as $id => $cell ) {
 825                         $attribs = array();
 826
 827                         if ( is_string( $id ) ) {
 828                                 $attribs['id'] = $id;
 829                         }
 830
 831                         $s .= Xml::element( 'td', $attribs, $cell );
 832                 }
 833
 834                 $s .= Xml::closeElement( 'tr' );
 835
 836                 return $s;
 837         }
 838 }
 839
 840 class XmlSelect {
 841         protected $options = array();
 842         protected $default = false;
 843         protected $attributes = array();
 844
 845         public function __construct( $name = false, $id = false, $default = false ) {
 846                 if ( $name ) {
 847                         $this->setAttribute( 'name', $name );
 848                 }
 849
 850                 if ( $id ) {
 851                         $this->setAttribute( 'id', $id );
 852                 }
 853
 854                 if ( $default !== false ) {
 855                         $this->default = $default;
 856                 }
 857         }
 858
 859         /**
 860          * @param $default
 861          */
 862         public function setDefault( $default ) {
 863                 $this->default = $default;
 864         }
 865
 866         /**
 867          * @param $name string
 868          * @param $value
 869          */
 870         public function setAttribute( $name, $value ) {
 871                 $this->attributes[$name] = $value;
 872         }
 873
 874         /**
 875          * @param $name
 876          * @return array|null
 877          */
 878         public function getAttribute( $name ) {
 879                 if ( isset( $this->attributes[$name] ) ) {
 880                         return $this->attributes[$name];
 881                 } else {
 882                         return null;
 883                 }
 884         }
 885
 886         /**
 887          * @param $name
 888          * @param $value bool
 889          */
 890         public function addOption( $name, $value = false ) {
 891                 // Stab stab stab
 892                 $value = $value !== false ? $value : $name;
 893
 894                 $this->options[] = array( $name => $value );
 895         }
 896
 897         /**
 898          * This accepts an array of form
 899          * label => value
 900          * label => ( label => value, label => value )
 901          *
 902          * @param  $options
 903          */
 904         public function addOptions( $options ) {
 905                 $this->options[] = $options;
 906         }
 907
 908         /**
 909          * This accepts an array of form
 910          * label => value
 911          * label => ( label => value, label => value )
 912          *
 913          * @param  $options
 914          * @param bool $default
 915          * @return string
 916          */
 917         static function formatOptions( $options, $default = false ) {
 918                 $data = '';
 919
 920                 foreach ( $options as $label => $value ) {
 921                         if ( is_array( $value ) ) {
 922                                 $contents = self::formatOptions( $value, $default );
 923                                 $data .= Html::rawElement( 'optgroup', array( 'label' => $label ), $contents ) . "\n";
 924                         } else {
 925                                 $data .= Xml::option( $label, $value, $value === $default ) . "\n";
 926                         }
 927                 }
 928
 929                 return $data;
 930         }
 931
 932         /**
 933          * @return string
 934          */
 935         public function getHTML() {
 936                 $contents = '';
 937
 938                 foreach ( $this->options as $options ) {
 939                         $contents .= self::formatOptions( $options, $this->default );
 940                 }
 941
 942                 return Html::rawElement( 'select', $this->attributes, rtrim( $contents ) );
 943         }
 944 }
 945
 946 /**
 947  * A wrapper class which causes Xml::encodeJsVar() and Xml::encodeJsCall() to
 948  * interpret a given string as being a JavaScript expression, instead of string
 949  * data.
 950  *
 951  * Example:
 952  *
 953  *    Xml::encodeJsVar( new XmlJsCode( 'a + b' ) );
 954  *
 955  * Returns "a + b".
 956  *
 957  * @note As of 1.21, XmlJsCode objects cannot be nested inside objects or arrays. The sole
 958  *       exception is the $args argument to Xml::encodeJsCall() because Xml::encodeJsVar() is
 959  *       called for each individual element in that array.
 960  *
 961  * @since 1.17
 962  */
 963 class XmlJsCode {
 964         public $value;
 965
 966         function __construct( $value ) {
 967                 $this->value = $value;
 968         }
 969 }