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<?php
namespace SMW\Parser;
/**
* @license GNU GPL v2+
* @since 2.5
*
* @author mwjames
*/
class LinksEncoder {
/**
* @since 2.5
*
* @param string $text
* @param InTextAnnotationParser $parser
*
* @return text
*/
public static function findAndEncodeLinks( $text, InTextAnnotationParser $parser ) {
// #2193
// Use [ instead of [ to distinguish it from the MW's Sanitizer
// who uses the same decode sequence and avoid issues when removing links
// after obfuscation
// #2671
// Use ] instead of ] (]) since CiteExtension use the later as
// encoding for the ref brackets
// Filter simple [ ... ] from [[ ... ]] links and ensure to find the correct
// start and end in case of [[Foo::[[Bar]]]] or [[Foo::[http://example.org/foo]]]
$text = str_replace(
[ '[', ']', '[[', ']]]]', ']]]', ']]' ],
[ '[', ']', '[[', ']]]]', ']]]', ']]' ],
$text
);
// Deep nesting is NOT supported as in [[Foo::[[abc]] [[Bar::123[[abc]] ]] ]]
return self::matchAndReplace( $text, $parser );
}
/**
* @since 2.5
*
* @param string $text
*
* @return text
*/
public static function removeLinkObfuscation( $text ) {
$from = [ '[', ']', '|' ];
$to = [ '[', ']', '|' ];
return str_replace( $from, $to, $text );
}
/**
* @since 2.5
*
* @param string $text
*
* @return text
*/
public static function encodeLinks( $text ) {
return str_replace(
[ '[', ']', '|' ],
[ '[', ']', '|' ],
$text
);
}
/**
* @since 2.5
*
* @param string $text
*
* @return text
*/
public static function decodeSquareBracket( $text ) {
return str_replace( [ '%5B', '%5D' ], [ '[', ']' ], $text );
}
/**
* @since 2.5
*
* @param string $text
*
* @return text
*/
public static function obfuscateAnnotation( $text ) {
return preg_replace_callback(
LinksProcessor::getRegexpPattern( false ),
function( array $matches ) {
return str_replace( '[', '[', $matches[0] );
},
self::decodeSquareBracket( $text )
);
}
/**
* @since 2.5
*
* @param string $text
*
* @return text
*/
public static function removeAnnotation( $text ) {
if ( strpos( $text, '::' ) === false && strpos( $text, ':=' ) === false ) {
return $text;
}
return preg_replace_callback(
LinksProcessor::getRegexpPattern( false ),
'self::doRemoveAnnotation',
self::decodeSquareBracket( $text )
);
}
private static function doRemoveAnnotation( array $matches ) {
$caption = false;
$value = '';
// #1453
if ( $matches[0] === InTextAnnotationParser::OFF || $matches[0] === InTextAnnotationParser::ON ) {
return false;
}
// Strict mode matching
if ( array_key_exists( 1, $matches ) ) {
if ( strpos( $matches[1], ':' ) !== false && isset( $matches[2] ) ) {
list( $matches[1], $matches[2] ) = explode( '::', $matches[1] . '::' . $matches[2], 2 );
}
}
if ( array_key_exists( 2, $matches ) ) {
// #1747
if ( strpos( $matches[1], '|' ) !== false ) {
return $matches[0];
}
$parts = explode( '|', $matches[2] );
$value = array_key_exists( 0, $parts ) ? $parts[0] : '';
$caption = array_key_exists( 1, $parts ) ? $parts[1] : false;
}
// #1855
if ( $value === '@@@' ) {
$value = '';
}
return $caption !== false ? $caption : $value;
}
private static function matchAndReplace( $text, $parser ) {
/**
* @see http://blog.angeloff.name/post/2012/08/05/php-recursive-patterns/
*
* \[{2} # find the first opening '[['.
* (?: # start a new group, this is so '|' below does not apply/affect the opening '['.
* [^\[\]]+ # skip ahead happily if no '[' or ']'.
* | # ...otherwise...
* (?R) # we may be at the start of a new group, repeat whole pattern.
* )
* * # nesting can be many levels deep.
* \]{2} # finally, expect a balanced closing ']]'
*/
preg_match_all("/\[{2}(?:[^\[\]]+|(?R))*\]{2}/is", $text, $matches );
$isOffAnnotation = false;
// At this point we distinguish between a normal [[Foo::bar]] annotation
// and a compound construct such as [[Foo::[[Foobar::Bar]] ]] and
// [[Foo::[http://example.org/foo foo] [[Foo::123|Bar]] ]].
//
// Only the compound is being processed and matched as we require to
// identify the boundaries of the enclosing annotation
foreach ( $matches[0] as $match ) {
// Ignore simple links like `[[:Property:Has URL|Has URL]]` but
// do parse `[[Has description::[[foo]][[:bar]]]]` (:= legacy notation)
if ( strpos( $match, '[[' ) !== false && strpos( $match, '::' ) === false && strpos( $match, ':=' ) === false ) {
continue;
}
// Remember whether the text contains OFF/ON marker (added by
// recursive parser, template, embedded result printer)
if ( $isOffAnnotation === false ) {
$isOffAnnotation = $match === InTextAnnotationParser::OFF;
}
$annotationOpenNum = substr_count( $match, '[[' );
// Only engage if the match contains more than one [[ :: ]] pair
if ( $annotationOpenNum > 1 ) {
$replace = self::replace( $match, $parser, $isOffAnnotation );
$text = str_replace( $match, $replace, $text );
}
}
return $text;
}
private static function replace( $match, $parser, $isOffAnnotation = false ) {
// Remove the Leading and last square bracket to avoid distortion
// during the annotation parsing
$match = substr( substr( $match, 2 ), 0, -2 );
// Restore OFF/ON for the recursive processing
if ( $isOffAnnotation === true ) {
$match = InTextAnnotationParser::OFF . $match . InTextAnnotationParser::ON;
}
// Only match annotations of style [[...::...]] during a recursive
// obfuscation process, any other processing is being done by the
// InTextAnnotation parser hereafter
//
// [[Foo::Bar]] annotation therefore run a pattern match and
// obfuscate the returning [[, |, ]] result
$replace = self::encodeLinks( preg_replace_callback(
LinksProcessor::getRegexpPattern( false ),
[ $parser, 'preprocess' ],
$match
) );
// Restore the square brackets
return '[[' . $replace . ']]';
}
}
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