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67 lines
2.2 KiB
PHP
67 lines
2.2 KiB
PHP
<?php
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/**
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* PHP-provided functions for LESS; see docs for $wgResourceLoaderLESSFunctions
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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*/
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class ResourceLoaderLESSFunctions {
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/**
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* Check if an image file reference is suitable for embedding.
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* An image is embeddable if it (a) exists, (b) has a suitable MIME-type,
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* (c) does not exceed IE<9 size limit of 32kb. This is a LESS predicate
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* function; it returns a LESS boolean value and can thus be used as a
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* mixin guard.
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*
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* @par Example:
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* @code
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* .background-image(@url) when(embeddable(@url)) {
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* background-image: url(@url) !ie;
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* }
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* @endcode
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*/
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public static function embeddable( $frame, $less ) {
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$base = pathinfo( $less->parser->sourceName, PATHINFO_DIRNAME );
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$url = $frame[2][0];
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$file = realpath( $base . '/' . $url );
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return $less->toBool( $file
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&& strpos( $url, '//' ) === false
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&& filesize( $file ) < CSSMin::EMBED_SIZE_LIMIT
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&& CSSMin::getMimeType( $file ) !== false );
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}
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/**
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* Convert an image URI to a base64-encoded data URI.
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*
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* @par Example:
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* @code
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* .fancy-button {
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* background-image: embed('../images/button-bg.png');
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* }
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* @endcode
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*/
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public static function embed( $frame, $less ) {
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$base = pathinfo( $less->parser->sourceName, PATHINFO_DIRNAME );
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$url = $frame[2][0];
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$file = realpath( $base . '/' . $url );
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$data = CSSMin::encodeImageAsDataURI( $file );
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$less->addParsedFile( $file );
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return 'url(' . $data . ')';
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}
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}
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