}
/**
- * Truncate a string to a specified length in bytes, appending an optional
- * string (e.g. for ellipses)
+ * This method is deprecated since 1.31 and kept as alias for truncateForDatabase, which
+ * has replaced it. This method provides truncation suitable for DB.
*
* The database offers limited byte lengths for some columns in the database;
* multi-byte character sets mean we need to ensure that only whole characters
- * are included, otherwise broken characters can be passed to the user
+ * are included, otherwise broken characters can be passed to the user.
*
- * If $length is negative, the string will be truncated from the beginning
+ * @deprecated since 1.31, use truncateForDatabase or truncateForVisual as appropriate.
*
* @param string $string String to truncate
- * @param int $length Maximum length (including ellipses)
+ * @param int $length Maximum length (including ellipsis)
* @param string $ellipsis String to append to the truncated text
* @param bool $adjustLength Subtract length of ellipsis from $length.
* $adjustLength was introduced in 1.18, before that behaved as if false.
* @return string
*/
function truncate( $string, $length, $ellipsis = '...', $adjustLength = true ) {
+ return $this->truncateForDatabase( $string, $length, $ellipsis, $adjustLength );
+ }
+
+ /**
+ * Truncate a string to a specified length in bytes, appending an optional
+ * string (e.g. for ellipsis)
+ *
+ * If $length is negative, the string will be truncated from the beginning
+ *
+ * @since 1.31
+ *
+ * @param string $string String to truncate
+ * @param int $length Maximum length in bytes
+ * @param string $ellipsis String to append to the end of truncated text
+ * @param bool $adjustLength Subtract length of ellipsis from $length
+ *
+ * @return string
+ */
+ function truncateForDatabase( $string, $length, $ellipsis = '...', $adjustLength = true ) {
+ return $this->truncateInternal(
+ $string, $length, $ellipsis, $adjustLength, 'strlen', 'substr'
+ );
+ }
+
+ /**
+ * Truncate a string to a specified number of characters, appending an optional
+ * string (e.g. for ellipsis).
+ *
+ * This provides multibyte version of truncate() method of this class, suitable for truncation
+ * based on number of characters, instead of number of bytes.
+ *
+ * If $length is negative, the string will be truncated from the beginning.
+ *
+ * @since 1.31
+ *
+ * @param string $string String to truncate
+ * @param int $length Maximum number of characters
+ * @param string $ellipsis String to append to the end of truncated text
+ * @param bool $adjustLength Subtract length of ellipsis from $length
+ *
+ * @return string
+ */
+ function truncateForVisual( $string, $length, $ellipsis = '...', $adjustLength = true ) {
+ // Passing encoding to mb_strlen and mb_substr is optional.
+ // Encoding defaults to mb_internal_encoding(), which is set to UTF-8 in Setup.php, so
+ // explicit specification of encoding is skipped.
+ // Note: Both multibyte methods are callables invoked in truncateInternal.
+ return $this->truncateInternal(
+ $string, $length, $ellipsis, $adjustLength, 'mb_strlen', 'mb_substr'
+ );
+ }
+
+ /**
+ * Internal method used for truncation. This method abstracts text truncation into
+ * one common method, allowing users to provide length measurement function and
+ * function for finding substring.
+ *
+ * For usages, see truncateForDatabase and truncateForVisual.
+ *
+ * @param string $string String to truncate
+ * @param int $length Maximum length of final text
+ * @param string $ellipsis String to append to the end of truncated text
+ * @param bool $adjustLength Subtract length of ellipsis from $length
+ * @param callable $measureLength Callable function used for determining the length of text
+ * @param callable $getSubstring Callable function used for getting the substrings
+ *
+ * @return string
+ */
+ private function truncateInternal(
+ $string, $length, $ellipsis = '...', $adjustLength = true, $measureLength, $getSubstring
+ ) {
+ if ( !is_callable( $measureLength ) || !is_callable( $getSubstring ) ) {
+ throw new InvalidArgumentException( 'Invalid callback provided' );
+ }
+
# Check if there is no need to truncate
- if ( strlen( $string ) <= abs( $length ) ) {
+ if ( $measureLength( $string ) <= abs( $length ) ) {
return $string; // no need to truncate
}
+
# Use the localized ellipsis character
if ( $ellipsis == '...' ) {
$ellipsis = wfMessage( 'ellipsis' )->inLanguage( $this )->escaped();
if ( $length == 0 ) {
return $ellipsis; // convention
}
+
$stringOriginal = $string;
# If ellipsis length is >= $length then we can't apply $adjustLength
- if ( $adjustLength && strlen( $ellipsis ) >= abs( $length ) ) {
+ if ( $adjustLength && $measureLength( $ellipsis ) >= abs( $length ) ) {
$string = $ellipsis; // this can be slightly unexpected
# Otherwise, truncate and add ellipsis...
} else {
- $eLength = $adjustLength ? strlen( $ellipsis ) : 0;
+ $ellipsisLength = $adjustLength ? $measureLength( $ellipsis ) : 0;
if ( $length > 0 ) {
- $length -= $eLength;
- $string = substr( $string, 0, $length ); // xyz...
+ $length -= $ellipsisLength;
+ $string = $getSubstring( $string, 0, $length ); // xyz...
$string = $this->removeBadCharLast( $string );
$string = rtrim( $string );
$string = $string . $ellipsis;
} else {
- $length += $eLength;
- $string = substr( $string, $length ); // ...xyz
+ $length += $ellipsisLength;
+ $string = $getSubstring( $string, $length ); // ...xyz
$string = $this->removeBadCharFirst( $string );
$string = ltrim( $string );
$string = $ellipsis . $string;
}
}
+
# Do not truncate if the ellipsis makes the string longer/equal (T24181).
# This check is *not* redundant if $adjustLength, due to the single case where
# LEN($ellipsis) > ABS($limit arg); $stringOriginal could be shorter than $string.
- if ( strlen( $string ) < strlen( $stringOriginal ) ) {
+ if ( $measureLength( $string ) < $measureLength( $stringOriginal ) ) {
return $string;
} else {
return $stringOriginal;
dépôts / lhc / web / wiklou.git / blobdiff