includes/content/JsonContent.php

   1 <?php
   2 /**
   3  * JSON Content Model
   4  *
   5  * @file
   6  *
   7  * @author Ori Livneh <ori@wikimedia.org>
   8  * @author Kunal Mehta <legoktm@gmail.com>
   9  */
  10
  11 /**
  12  * Represents the content of a JSON content.
  13  * @since 1.24
  14  */
  15 class JsonContent extends TextContent {
  16
  17         /**
  18          * @since 1.25
  19          * @var Status
  20          */
  21         protected $jsonParse;
  22
  23         /**
  24          * @param string $text JSON
  25          */
  26         public function __construct( $text, $modelId = CONTENT_MODEL_JSON ) {
  27                 parent::__construct( $text, $modelId );
  28         }
  29
  30         /**
  31          * Decodes the JSON into a PHP associative array.
  32          *
  33          * @deprecated since 1.25 Use getData instead.
  34          * @return array|null
  35          */
  36         public function getJsonData() {
  37                 wfDeprecated( __METHOD__, '1.25' );
  38                 return FormatJson::decode( $this->getNativeData(), true );
  39         }
  40
  41         /**
  42          * Decodes the JSON string.
  43          *
  44          * Note that this parses it without casting objects to associative arrays.
  45          * Objects and arrays are kept as distinguishable types in the PHP values.
  46          *
  47          * @return Status
  48          */
  49         public function getData() {
  50                 if ( $this->jsonParse === null ) {
  51                         $this->jsonParse = FormatJson::parse( $this->getNativeData() );
  52                 }
  53                 return $this->jsonParse;
  54         }
  55
  56         /**
  57          * @return bool Whether content is valid.
  58          */
  59         public function isValid() {
  60                 return $this->getData()->isGood();
  61         }
  62
  63         /**
  64          * Pretty-print JSON.
  65          *
  66          * If called before validation, it may return JSON "null".
  67          *
  68          * @return string
  69          */
  70         public function beautifyJSON() {
  71                 return FormatJson::encode( $this->getData()->getValue(), true, FormatJson::UTF8_OK );
  72         }
  73
  74         /**
  75          * Beautifies JSON prior to save.
  76          *
  77          * @param Title $title Title
  78          * @param User $user User
  79          * @param ParserOptions $popts
  80          * @return JsonContent
  81          */
  82         public function preSaveTransform( Title $title, User $user, ParserOptions $popts ) {
  83                 // FIXME: WikiPage::doEditContent invokes PST before validation. As such, native data
  84                 // may be invalid (though PST result is discarded later in that case).
  85                 if ( !$this->isValid() ) {
  86                         return $this;
  87                 }
  88
  89                 return new static( $this->beautifyJSON() );
  90         }
  91
  92         /**
  93          * Set the HTML and add the appropriate styles.
  94          *
  95          * @param Title $title
  96          * @param int $revId
  97          * @param ParserOptions $options
  98          * @param bool $generateHtml
  99          * @param ParserOutput $output
 100          */
 101         protected function fillParserOutput( Title $title, $revId,
 102                 ParserOptions $options, $generateHtml, ParserOutput &$output
 103         ) {
 104                 // FIXME: WikiPage::doEditContent generates parser output before validation.
 105                 // As such, native data may be invalid (though output is discarded later in that case).
 106                 if ( $generateHtml && $this->isValid() ) {
 107                         $output->setText( $this->rootValueTable( $this->getData()->getValue() ) );
 108                         $output->addModuleStyles( 'mediawiki.content.json' );
 109                 } else {
 110                         $output->setText( '' );
 111                 }
 112         }
 113
 114         /**
 115          * Construct HTML table representation of any JSON value.
 116          *
 117          * See also valueCell, which is similar.
 118          *
 119          * @param mixed $val
 120          * @return string HTML.
 121          */
 122         protected function rootValueTable( $val ) {
 123                 if ( is_object( $val ) ) {
 124                         return self::objectTable( $val );
 125                 }
 126
 127                 if ( is_array( $val ) ) {
 128                         // Wrap arrays in another array so that they're visually boxed in a container.
 129                         // Otherwise they are visually indistinguishable from a single value.
 130                         return self::arrayTable( array( $val ) );
 131                 }
 132
 133                 return Html::rawElement( 'table', array( 'class' => 'mw-json mw-json-single-value' ),
 134                         Html::rawElement( 'tbody', array(),
 135                                 Html::rawElement( 'tr', array(),
 136                                         Html::element( 'td', array(), self::primitiveValue( $val ) )
 137                                 )
 138                         )
 139                 );
 140         }
 141
 142         /**
 143          * Create HTML table representing a JSON object.
 144          *
 145          * @param stdClass $mapping
 146          * @return string HTML
 147          */
 148         protected function objectTable( $mapping ) {
 149                 $rows = array();
 150                 $empty = true;
 151
 152                 foreach ( $mapping as $key => $val ) {
 153                         $rows[] = $this->objectRow( $key, $val );
 154                         $empty = false;
 155                 }
 156                 if ( $empty ) {
 157                         $rows[] = Html::rawElement( 'tr', array(),
 158                                 Html::element( 'td', array( 'class' => 'mw-json-empty' ),
 159                                         wfMessage( 'content-json-empty-object' )->text()
 160                                 )
 161                         );
 162                 }
 163                 return Html::rawElement( 'table', array( 'class' => 'mw-json' ),
 164                         Html::rawElement( 'tbody', array(), join( '', $rows ) )
 165                 );
 166         }
 167
 168         /**
 169          * Create HTML table row representing one object property.
 170          *
 171          * @param string $key
 172          * @param mixed $val
 173          * @return string HTML.
 174          */
 175         protected function objectRow( $key, $val ) {
 176                 $th = Html::element( 'th', array(), $key );
 177                 $td = self::valueCell( $val );
 178                 return Html::rawElement( 'tr', array(), $th . $td );
 179         }
 180
 181         /**
 182          * Create HTML table representing a JSON array.
 183          *
 184          * @param array $mapping
 185          * @return string HTML
 186          */
 187         protected function arrayTable( $mapping ) {
 188                 $rows = array();
 189                 $empty = true;
 190
 191                 foreach ( $mapping as $val ) {
 192                         $rows[] = $this->arrayRow( $val );
 193                         $empty = false;
 194                 }
 195                 if ( $empty ) {
 196                         $rows[] = Html::rawElement( 'tr', array(),
 197                                 Html::element( 'td', array( 'class' => 'mw-json-empty' ),
 198                                         wfMessage( 'content-json-empty-array' )->text()
 199                                 )
 200                         );
 201                 }
 202                 return Html::rawElement( 'table', array( 'class' => 'mw-json' ),
 203                         Html::rawElement( 'tbody', array(), join( "\n", $rows ) )
 204                 );
 205         }
 206
 207         /**
 208          * Create HTML table row representing the value in an array.
 209          *
 210          * @param mixed $val
 211          * @return string HTML.
 212          */
 213         protected function arrayRow( $val ) {
 214                 $td = self::valueCell( $val );
 215                 return Html::rawElement( 'tr', array(), $td );
 216         }
 217
 218         /**
 219          * Construct HTML table cell representing any JSON value.
 220          *
 221          * @param mixed $val
 222          * @return string HTML.
 223          */
 224         protected function valueCell( $val ) {
 225                 if ( is_object( $val ) ) {
 226                         return Html::rawElement( 'td', array(), self::objectTable( $val ) );
 227                 }
 228
 229                 if ( is_array( $val ) ) {
 230                         return Html::rawElement( 'td', array(), self::arrayTable( $val ) );
 231                 }
 232
 233                 return Html::element( 'td', array( 'class' => 'value' ), self::primitiveValue( $val ) );
 234         }
 235
 236         /**
 237          * Construct text representing a JSON primitive value.
 238          *
 239          * @param mixed $val
 240          * @return string Text.
 241          */
 242         protected function primitiveValue( $val ) {
 243                 if ( is_string( $val ) ) {
 244                         // Don't FormatJson::encode for strings since we want quotes
 245                         // and new lines to render visually instead of escaped.
 246                         return '"' . $val . '"';
 247                 }
 248                 return FormatJson::encode( $val );
 249         }
 250 }