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| 1 | <?php |
| 2 | |
| 3 | namespace Wikimedia\Purtle; |
| 4 | |
| 5 | use InvalidArgumentException; |
| 6 | |
| 7 | /** |
| 8 | * XML/RDF implementation of RdfWriter |
| 9 | * |
| 10 | * @license GPL-2.0-or-later |
| 11 | * @author Daniel Kinzler |
| 12 | */ |
| 13 | class XmlRdfWriter extends RdfWriterBase { |
| 14 | |
| 15 | /** |
| 16 | * @param string $role |
| 17 | * @param BNodeLabeler|null $labeler |
| 18 | */ |
| 19 | public function __construct( $role = parent::DOCUMENT_ROLE, ?BNodeLabeler $labeler = null ) { |
| 20 | parent::__construct( $role, $labeler ); |
| 21 | |
| 22 | $this->transitionTable[self::STATE_START][self::STATE_DOCUMENT] = function () { |
| 23 | $this->beginDocument(); |
| 24 | }; |
| 25 | $this->transitionTable[self::STATE_DOCUMENT][self::STATE_FINISH] = function () { |
| 26 | $this->finishDocument(); |
| 27 | }; |
| 28 | $this->transitionTable[self::STATE_OBJECT][self::STATE_DOCUMENT] = function () { |
| 29 | $this->finishSubject(); |
| 30 | }; |
| 31 | $this->transitionTable[self::STATE_OBJECT][self::STATE_SUBJECT] = function () { |
| 32 | $this->finishSubject(); |
| 33 | }; |
| 34 | } |
| 35 | |
| 36 | /** |
| 37 | * @param string $text |
| 38 | * |
| 39 | * @return string |
| 40 | */ |
| 41 | private function escape( $text ) { |
| 42 | return htmlspecialchars( $text, ENT_QUOTES ); |
| 43 | } |
| 44 | |
| 45 | /** |
| 46 | * @inheritDoc |
| 47 | */ |
| 48 | protected function expandSubject( &$base, &$local ) { |
| 49 | $this->expandQName( $base, $local ); |
| 50 | } |
| 51 | |
| 52 | /** |
| 53 | * @inheritDoc |
| 54 | */ |
| 55 | protected function expandPredicate( &$base, &$local ) { |
| 56 | $this->expandShorthand( $base, $local ); |
| 57 | } |
| 58 | |
| 59 | /** |
| 60 | * @inheritDoc |
| 61 | */ |
| 62 | protected function expandResource( &$base, &$local ) { |
| 63 | $this->expandQName( $base, $local ); |
| 64 | } |
| 65 | |
| 66 | /** |
| 67 | * @inheritDoc |
| 68 | */ |
| 69 | protected function expandType( &$base, &$local ) { |
| 70 | $this->expandQName( $base, $local ); |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * @param string $ns |
| 75 | * @param string $name |
| 76 | * @param string[] $attributes |
| 77 | * @param string|null $content |
| 78 | */ |
| 79 | private function tag( $ns, $name, $attributes = [], $content = null ) { |
| 80 | $sep = $ns === '' ? '' : ':'; |
| 81 | $this->write( '<' . $ns . $sep . $name ); |
| 82 | |
| 83 | foreach ( $attributes as $attr => $value ) { |
| 84 | if ( is_int( $attr ) ) { |
| 85 | // positional array entries are passed verbatim, may be callbacks. |
| 86 | $this->write( $value ); |
| 87 | continue; |
| 88 | } |
| 89 | |
| 90 | $this->write( " $attr=\"" . $this->escape( $value ) . '"' ); |
| 91 | } |
| 92 | |
| 93 | if ( $content === null ) { |
| 94 | $this->write( '>' ); |
| 95 | } elseif ( $content === '' ) { |
| 96 | $this->write( '/>' ); |
| 97 | } else { |
| 98 | $this->write( '>' . $content ); |
| 99 | $this->close( $ns, $name ); |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * @param string $ns |
| 105 | * @param string $name |
| 106 | */ |
| 107 | private function close( $ns, $name ) { |
| 108 | $sep = $ns === '' ? '' : ':'; |
| 109 | $this->write( '</' . $ns . $sep . $name . '>' ); |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * Generates an attribute list, containing the attribute given by $name, or rdf:nodeID |
| 114 | * if $target is a blank node id (starting with "_:"). If $target is a qname, an attempt |
| 115 | * is made to resolve it into a full IRI based on the namespaces registered by calling |
| 116 | * prefix(). |
| 117 | * |
| 118 | * @param string $name the attribute name (without the 'rdf:' prefix) |
| 119 | * @param string|null $base |
| 120 | * @param string|null $local |
| 121 | * |
| 122 | * @throws InvalidArgumentException |
| 123 | * @return string[] |
| 124 | */ |
| 125 | private function getTargetAttributes( $name, $base, $local ) { |
| 126 | if ( $base === null && $local === null ) { |
| 127 | return []; |
| 128 | } |
| 129 | |
| 130 | // handle blank |
| 131 | if ( $base === '_' ) { |
| 132 | $name = 'nodeID'; |
| 133 | $value = $local; |
| 134 | } elseif ( $local !== null ) { |
| 135 | throw new InvalidArgumentException( "Expected IRI, got QName: $base:$local" ); |
| 136 | } else { |
| 137 | $value = $base; |
| 138 | } |
| 139 | |
| 140 | return [ |
| 141 | // @phan-suppress-next-line PhanTypeMismatchReturn |
| 142 | "rdf:$name" => $value |
| 143 | ]; |
| 144 | } |
| 145 | |
| 146 | /** |
| 147 | * Emit a document header. |
| 148 | */ |
| 149 | private function beginDocument() { |
| 150 | $this->write( "<?xml version=\"1.0\"?>\n" ); |
| 151 | |
| 152 | // define a callback for generating namespace attributes |
| 153 | $namespaceAttrCallback = function () { |
| 154 | $attr = ''; |
| 155 | |
| 156 | $namespaces = $this->getPrefixes(); |
| 157 | foreach ( $namespaces as $ns => $uri ) { |
| 158 | $escapedUri = htmlspecialchars( $uri, ENT_QUOTES ); |
| 159 | $nss = $ns === '' ? '' : ":$ns"; |
| 160 | $attr .= " xmlns$nss=\"$escapedUri\""; |
| 161 | } |
| 162 | |
| 163 | return $attr; |
| 164 | }; |
| 165 | |
| 166 | $this->tag( 'rdf', 'RDF', [ $namespaceAttrCallback ] ); |
| 167 | $this->write( "\n" ); |
| 168 | } |
| 169 | |
| 170 | /** |
| 171 | * @param string $base |
| 172 | * @param string|null $local |
| 173 | */ |
| 174 | protected function writeSubject( $base, $local = null ) { |
| 175 | $attr = $this->getTargetAttributes( 'about', $base, $local ); |
| 176 | |
| 177 | $this->write( "\t" ); |
| 178 | $this->tag( 'rdf', 'Description', $attr ); |
| 179 | $this->write( "\n" ); |
| 180 | } |
| 181 | |
| 182 | /** |
| 183 | * Emit the root element |
| 184 | */ |
| 185 | private function finishSubject() { |
| 186 | $this->write( "\t" ); |
| 187 | $this->close( 'rdf', 'Description' ); |
| 188 | $this->write( "\n" ); |
| 189 | } |
| 190 | |
| 191 | /** |
| 192 | * Write document footer |
| 193 | */ |
| 194 | private function finishDocument() { |
| 195 | // close document element |
| 196 | $this->close( 'rdf', 'RDF' ); |
| 197 | $this->write( "\n" ); |
| 198 | } |
| 199 | |
| 200 | /** |
| 201 | * @param string $base |
| 202 | * @param string|null $local |
| 203 | */ |
| 204 | protected function writePredicate( $base, $local = null ) { |
| 205 | // noop |
| 206 | } |
| 207 | |
| 208 | /** |
| 209 | * @param string $base |
| 210 | * @param string|null $local |
| 211 | */ |
| 212 | protected function writeResource( $base, $local = null ) { |
| 213 | $attr = $this->getTargetAttributes( 'resource', $base, $local ); |
| 214 | |
| 215 | $this->write( "\t\t" ); |
| 216 | $this->tag( $this->currentPredicate[0], $this->currentPredicate[1], $attr, '' ); |
| 217 | $this->write( "\n" ); |
| 218 | } |
| 219 | |
| 220 | /** |
| 221 | * @param string $text |
| 222 | * @param string|null $language |
| 223 | */ |
| 224 | protected function writeText( $text, $language = null ) { |
| 225 | $attr = $this->isValidLanguageCode( $language ) |
| 226 | ? [ 'xml:lang' => $language ] |
| 227 | : []; |
| 228 | |
| 229 | $this->write( "\t\t" ); |
| 230 | $this->tag( |
| 231 | $this->currentPredicate[0], |
| 232 | $this->currentPredicate[1], |
| 233 | $attr, |
| 234 | $this->escape( $text ) |
| 235 | ); |
| 236 | $this->write( "\n" ); |
| 237 | } |
| 238 | |
| 239 | /** |
| 240 | * @param string $literal |
| 241 | * @param string|null $typeBase |
| 242 | * @param string|null $typeLocal |
| 243 | */ |
| 244 | public function writeValue( $literal, $typeBase, $typeLocal = null ) { |
| 245 | $attr = $this->getTargetAttributes( 'datatype', $typeBase, $typeLocal ); |
| 246 | |
| 247 | $this->write( "\t\t" ); |
| 248 | $this->tag( |
| 249 | $this->currentPredicate[0], |
| 250 | $this->currentPredicate[1], |
| 251 | $attr, |
| 252 | $this->escape( $literal ) |
| 253 | ); |
| 254 | $this->write( "\n" ); |
| 255 | } |
| 256 | |
| 257 | /** |
| 258 | * @param string $role |
| 259 | * @param BNodeLabeler $labeler |
| 260 | * |
| 261 | * @return RdfWriterBase |
| 262 | */ |
| 263 | protected function newSubWriter( $role, BNodeLabeler $labeler ) { |
| 264 | $writer = new self( $role, $labeler ); |
| 265 | |
| 266 | return $writer; |
| 267 | } |
| 268 | |
| 269 | /** |
| 270 | * @return string a MIME type |
| 271 | */ |
| 272 | public function getMimeType() { |
| 273 | return 'application/rdf+xml; charset=UTF-8'; |
| 274 | } |
| 275 | |
| 276 | } |