(.*)<\/div>$/s', trim( $out ), $m ) ) { $out = trim( $m[1] ); } else { throw new RuntimeException( 'Unexpected output from Pygments encountered' ); } } return $out; } /** * @param string $code * @param bool $isInline * @return string HTML */ private static function plainCodeWrap( $code, $isInline ) { if ( $isInline ) { return htmlspecialchars( $code, ENT_NOQUOTES ); } return Html::rawElement( 'div', [ 'class' => self::HIGHLIGHT_CSS_CLASS ], Html::element( 'pre', [], $code ) ); } /** * @param string $code * @param string|null $lang * @param array $args * @param Parser|null $parser Parser, if generating content to be parsed. * @return Status */ private static function highlightInner( $code, $lang = null, $args = [], ?Parser $parser = null ) { $status = new Status; $lexer = self::getLexer( $lang ); if ( $lexer === null && $lang !== null ) { $status->warning( 'syntaxhighlight-error-unknown-language', $lang ); } // For empty tag, output nothing instead of empty

.
		if ( $code === '' ) {
			$status->value = '';
			return $status;
		}

		$length = strlen( $code );
		if ( strlen( $code ) > self::getMaxBytes() ) {
			// Disable syntax highlighting
			$lexer = null;
			$status->warning(
				'syntaxhighlight-error-exceeds-size-limit',
				$length,
				self::getMaxBytes()
			);
		}

		$isInline = isset( $args['inline'] );
		$showLines = isset( $args['line'] );

		if ( $isInline ) {
			$code = trim( $code );
		}

		if ( $lexer === null ) {
			// When syntax highlighting is disabled..
			$status->value = self::plainCodeWrap( $code, $isInline );
			return $status;
		}

		if ( $parser && !$parser->incrementExpensiveFunctionCount() ) {
			// Highlighting is expensive, return unstyled
			$status->value = self::plainCodeWrap( $code, $isInline );
			return $status;
		}

		$options = [
			'cssclass' => self::HIGHLIGHT_CSS_CLASS,
			'encoding' => 'utf-8',
		];

		// Line numbers
		if ( $showLines ) {
			$options['linenos'] = 'inline';
		}

		if ( $lexer === 'php' && strpos( $code, 'getMainWANObjectCache();
		$error = null;
		$output = $cache->getWithSetCallback(
			$cache->makeGlobalKey( 'highlight', self::makeCacheKeyHash( $code, $lexer, $options ) ),
			$cache::TTL_MONTH,
			static function ( $oldValue, &$ttl ) use ( $code, $lexer, $options, &$error ) {
				try {
					return Pygmentize::highlight( $lexer, $code, $options );
				} catch ( PygmentsException $e ) {
					$ttl = WANObjectCache::TTL_UNCACHEABLE;
					$error = $e->getMessage();
					return null;
				}
			}
		);

		if ( $error !== null || $output === null ) {
			$status->warning( 'syntaxhighlight-error-pygments-invocation-failure' );
			if ( $error !== null ) {
				wfWarn( 'Failed to invoke Pygments: ' . $error );
			} else {
				wfWarn( 'Invoking Pygments returned blank output with no error response' );
			}

			// Fall back to preformatted code without syntax highlighting
			$output = self::plainCodeWrap( $code, $isInline );
		}

		$status->value = $output;

		return $status;
	}

	/**
	 * Highlight a code-block using a particular lexer.
	 *
	 * This produces raw HTML (wrapped by Status), the caller is responsible
	 * for making sure the "ext.pygments" module is loaded in the output.
	 *
	 * @param string $code Code to highlight.
	 * @param string|null $lang Language name, or null to use plain markup.
	 * @param array $args Associative array of additional arguments.
	 *  If it contains a 'line' key, the output will include line numbers.
	 *  If it includes a 'highlight' key, the value will be parsed as a
	 *   comma-separated list of lines and line-ranges to highlight.
	 *  If it contains a 'start' key, the value will be used as the line at which to
	 *   start highlighting.
	 *  If it contains a 'inline' key, the output will not be wrapped in `
`.
	 *  If it contains a 'linelinks' key, lines will have links and anchors with a prefix
	 *   of the value. Similar to the lineanchors+linespans features in Pygments.
	 *  If it contains a 'copy' key, a link will be shown for copying content to the clipboard.
	 * @param Parser|null $parser Parser, if generating content to be parsed.
	 * @return Status Status object, with HTML representing the highlighted
	 *  code as its value.
	 */
	public static function highlight( $code, $lang = null, $args = [], ?Parser $parser = null ) {
		$status = self::highlightInner( $code, $lang, $args, $parser );
		$output = $status->getValue();

		$isInline = isset( $args['inline'] );
		$showLines = isset( $args['line'] );
		$lexer = self::getLexer( $lang );

		// Post-Pygment HTML transformations.

		if ( $showLines ) {
			$lineReplace = Html::element( 'span', [ 'class' => 'linenos', 'data-line' => '$1' ] );
			if ( !empty( $args['linelinks'] ) ) {
				$lineReplace = Html::rawElement(
					'a',
					[ 'href' => '#' . $args['linelinks'] . '-$1' ],
					$lineReplace
				);
			}
			// Convert line numbers to data attributes so they
			// can be displayed as CSS generated content and be
			// unselectable in all browsers.
			$output = preg_replace(
				'`\s*([^<]*)\s*`',
				$lineReplace,
				$output
			);
		}

		// Allow certain HTML attributes
		$htmlAttribs = Sanitizer::validateAttributes(
			$args, array_flip( [ 'style', 'class', 'id' ] )
		);

		$dir = ( isset( $args['dir'] ) && $args['dir'] === 'rtl' ) ? 'rtl' : 'ltr';

		// Build class list
		$classList = [];
		if ( isset( $htmlAttribs['class'] ) ) {
			$classList[] = $htmlAttribs['class'];
		}
		$classList[] = self::HIGHLIGHT_CSS_CLASS;
		if ( $lexer !== null ) {
			$classList[] = self::HIGHLIGHT_CSS_CLASS . '-lang-' . $lexer;
		}
		$classList[] = 'mw-content-' . $dir;
		if ( $showLines ) {
			$classList[] = self::HIGHLIGHT_CSS_CLASS . '-lines';
		}
		if ( !$isInline && isset( $args['copy'] ) ) {
			$classList[] = 'mw-highlight-copy';
		}
		$htmlAttribs['class'] = implode( ' ', $classList );
		$htmlAttribs['dir'] = $dir;
		'@phan-var array{class:string,dir:string} $htmlAttribs';

		if ( $isInline ) {
			// We've already trimmed the input $code before highlighting,
			// but pygment's standard out adds a line break afterwards,
			// which would then be preserved in the paragraph that wraps this,
			// and become visible as a space. Avoid that.
			$output = trim( $output );

			// Enforce inlineness. Stray newlines may result in unexpected list and paragraph processing
			// (also known as doBlockLevels()).
			$output = str_replace( "\n", ' ', $output );
			$output = Html::rawElement( 'code', $htmlAttribs, $output );
		} else {
			$output = self::unwrap( $output );

			if ( $parser ) {
				// Use 'nowiki' strip marker to prevent list processing (also known as doBlockLevels()).
				// However, leave the wrapping 
 outside to prevent 
-wrapping.
				$marker = $parser::MARKER_PREFIX . '-syntaxhighlightinner-' .
					sprintf( '%08X', $parser->mMarkerIndex++ ) . $parser::MARKER_SUFFIX;
				$parser->getStripState()->addNoWiki( $marker, $output );
				$output = $marker;
			}

			$output = Html::openElement( 'div', $htmlAttribs ) .
				$output .
				Html::closeElement( 'div' );
		}

		$status->value = $output;
		return $status;
	}

	/**
	 * Construct a cache key for the results of a Pygments invocation.
	 *
	 * @param string $code Code to be highlighted.
	 * @param string $lexer Lexer name.
	 * @param array $options Options array.
	 * @return string Cache key.
	 */
	private static function makeCacheKeyHash( $code, $lexer, $options ) {
		$optionString = FormatJson::encode( $options, false, FormatJson::ALL_OK );
		return md5( "{$code}|{$lexer}|{$optionString}|" . self::CACHE_VERSION );
	}

	/**
	 * Take an input specifying a list of lines to highlight, returning
	 * a raw list of matching line numbers.
	 *
	 * Input is comma-separated list of lines or line ranges.
	 *
	 * @param string $lineSpec
	 * @return int[] Line numbers.
	 */
	protected static function parseHighlightLines( $lineSpec ) {
		$lines = [];
		$values = array_map( 'trim', explode( ',', $lineSpec ) );
		foreach ( $values as $value ) {
			if ( ctype_digit( $value ) ) {
				$lines[] = (int)$value;
			} elseif ( strpos( $value, '-' ) !== false ) {
				[ $start, $end ] = array_map( 'intval', explode( '-', $value ) );
				if ( self::validHighlightRange( $start, $end ) ) {
					for ( $i = $start; $i <= $end; $i++ ) {
						$lines[] = $i;
					}
				}
			}
			if ( count( $lines ) > self::getMaxLines() ) {
				$lines = array_slice( $lines, 0, self::getMaxLines() );
				break;
			}
		}
		return $lines;
	}

	/**
	 * Validate a provided input range
	 * @param int $start
	 * @param int $end
	 * @return bool
	 */
	protected static function validHighlightRange( $start, $end ) {
		// Since we're taking this tiny range and producing a an
		// array of every integer between them, it would be trivial
		// to DoS the system by asking for a huge range.
		// Impose an arbitrary limit on the number of lines in a
		// given range to reduce the impact.
		return $start > 0 &&
			$start < $end &&
			$end - $start < self::getMaxLines();
	}
}