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<?php /** * css.cls.php - modified PHP implementation of Matthias Mullie's CSS minifier * * @author Matthias Mullie <[email protected]> * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved * @license MIT License */ namespace LiteSpeed\Lib\CSS_JS_MIN\Minify; use LiteSpeed\Lib\CSS_JS_MIN\Minify\Minify; use LiteSpeed\Lib\CSS_JS_MIN\Minify\Exception\FileImportException; use LiteSpeed\Lib\CSS_JS_MIN\PathConverter\Converter; use LiteSpeed\Lib\CSS_JS_MIN\PathConverter\ConverterInterface; defined( 'WPINC' ) || exit; class CSS extends Minify { /** * @var int maximum import size in kB */ protected $maxImportSize = 5; /** * @var string[] valid import extensions */ protected $importExtensions = array( 'gif' => 'data:image/gif', 'png' => 'data:image/png', 'jpe' => 'data:image/jpeg', 'jpg' => 'data:image/jpeg', 'jpeg' => 'data:image/jpeg', 'svg' => 'data:image/svg+xml', 'woff' => 'data:application/x-font-woff', 'woff2' => 'data:application/x-font-woff2', 'avif' => 'data:image/avif', 'apng' => 'data:image/apng', 'webp' => 'data:image/webp', 'tif' => 'image/tiff', 'tiff' => 'image/tiff', 'xbm' => 'image/x-xbitmap', ); /** * Set the maximum size if files to be imported. * * Files larger than this size (in kB) will not be imported into the CSS. * Importing files into the CSS as data-uri will save you some connections, * but we should only import relatively small decorative images so that our * CSS file doesn't get too bulky. * * @param int $size Size in kB */ public function setMaxImportSize( $size ) { $this->maxImportSize = $size; } /** * Set the type of extensions to be imported into the CSS (to save network * connections). * Keys of the array should be the file extensions & respective values * should be the data type. * * @param string[] $extensions Array of file extensions */ public function setImportExtensions( array $extensions ) { $this->importExtensions = $extensions; } /** * Move any import statements to the top. * * @param string $content Nearly finished CSS content * * @return string */ public function moveImportsToTop( $content ) { if ( preg_match_all( '/(;?)(@import (?<url>url\()?(?P<quotes>["\']?).+?(?P=quotes)(?(url)\)));?/', $content, $matches ) ) { // remove from content foreach ( $matches[0] as $import ) { $content = str_replace( $import, '', $content ); } // add to top $content = implode( ';', $matches[2] ) . ';' . trim( $content, ';' ); } return $content; } /** * Combine CSS from import statements. * * \@import's will be loaded and their content merged into the original file, * to save HTTP requests. * * @param string $source The file to combine imports for * @param string $content The CSS content to combine imports for * @param string[] $parents Parent paths, for circular reference checks * * @return string * * @throws FileImportException */ protected function combineImports( $source, $content, $parents ) { $importRegexes = array( // @import url(xxx) '/ # import statement @import # whitespace \s+ # open url() url\( # (optional) open path enclosure (?P<quotes>["\']?) # fetch path (?P<path>.+?) # (optional) close path enclosure (?P=quotes) # close url() \) # (optional) trailing whitespace \s* # (optional) media statement(s) (?P<media>[^;]*) # (optional) trailing whitespace \s* # (optional) closing semi-colon ;? /ix', // @import 'xxx' '/ # import statement @import # whitespace \s+ # open path enclosure (?P<quotes>["\']) # fetch path (?P<path>.+?) # close path enclosure (?P=quotes) # (optional) trailing whitespace \s* # (optional) media statement(s) (?P<media>[^;]*) # (optional) trailing whitespace \s* # (optional) closing semi-colon ;? /ix', ); // find all relative imports in css $matches = array(); foreach ( $importRegexes as $importRegex ) { if ( preg_match_all( $importRegex, $content, $regexMatches, PREG_SET_ORDER ) ) { $matches = array_merge( $matches, $regexMatches ); } } $search = array(); $replace = array(); // loop the matches foreach ( $matches as $match ) { // get the path for the file that will be imported $importPath = dirname( $source ) . '/' . $match['path']; // only replace the import with the content if we can grab the // content of the file if ( ! $this->canImportByPath( $match['path'] ) || ! $this->canImportFile( $importPath ) ) { continue; } // check if current file was not imported previously in the same // import chain. if ( in_array( $importPath, $parents ) ) { throw new FileImportException( 'Failed to import file "' . $importPath . '": circular reference detected.' ); } // grab referenced file & minify it (which may include importing // yet other @import statements recursively) $minifier = new self( $importPath ); $minifier->setMaxImportSize( $this->maxImportSize ); $minifier->setImportExtensions( $this->importExtensions ); $importContent = $minifier->execute( $source, $parents ); // check if this is only valid for certain media if ( ! empty( $match['media'] ) ) { $importContent = '@media ' . $match['media'] . '{' . $importContent . '}'; } // add to replacement array $search[] = $match[0]; $replace[] = $importContent; } // replace the import statements return str_replace( $search, $replace, $content ); } /** * Import files into the CSS, base64-ized. * * @url(image.jpg) images will be loaded and their content merged into the * original file, to save HTTP requests. * * @param string $source The file to import files for * @param string $content The CSS content to import files for * * @return string */ protected function importFiles( $source, $content ) { $regex = '/url\((["\']?)(.+?)\\1\)/i'; if ( $this->importExtensions && preg_match_all( $regex, $content, $matches, PREG_SET_ORDER ) ) { $search = array(); $replace = array(); // loop the matches foreach ( $matches as $match ) { $extension = substr( strrchr( $match[2], '.' ), 1 ); if ( $extension && ! array_key_exists( $extension, $this->importExtensions ) ) { continue; } // get the path for the file that will be imported $path = $match[2]; $path = dirname( $source ) . '/' . $path; // only replace the import with the content if we're able to get // the content of the file, and it's relatively small if ( $this->canImportFile( $path ) && $this->canImportBySize( $path ) ) { // grab content && base64-ize $importContent = $this->load( $path ); $importContent = base64_encode( $importContent ); // build replacement $search[] = $match[0]; $replace[] = 'url(' . $this->importExtensions[ $extension ] . ';base64,' . $importContent . ')'; } } // replace the import statements $content = str_replace( $search, $replace, $content ); } return $content; } /** * Minify the data. * Perform CSS optimizations. * * @param string[optional] $path Path to write the data to * @param string[] $parents Parent paths, for circular reference checks * * @return string The minified data */ public function execute( $path = null, $parents = array() ) { $content = ''; // loop CSS data (raw data and files) foreach ( $this->data as $source => $css ) { /* * Let's first take out strings & comments, since we can't just * remove whitespace anywhere. If whitespace occurs inside a string, * we should leave it alone. E.g.: * p { content: "a test" } */ $this->extractStrings(); $this->stripComments(); $this->extractMath(); $this->extractCustomProperties(); $css = $this->replace( $css ); $css = $this->stripWhitespace( $css ); $css = $this->convertLegacyColors( $css ); $css = $this->cleanupModernColors( $css ); $css = $this->shortenHEXColors( $css ); $css = $this->shortenZeroes( $css ); $css = $this->shortenFontWeights( $css ); $css = $this->stripEmptyTags( $css ); // restore the string we've extracted earlier $css = $this->restoreExtractedData( $css ); $source = is_int( $source ) ? '' : $source; $parents = $source ? array_merge( $parents, array( $source ) ) : $parents; $css = $this->combineImports( $source, $css, $parents ); $css = $this->importFiles( $source, $css ); /* * If we'll save to a new path, we'll have to fix the relative paths * to be relative no longer to the source file, but to the new path. * If we don't write to a file, fall back to same path so no * conversion happens (because we still want it to go through most * of the move code, which also addresses url() & @import syntax...) */ $converter = $this->getPathConverter( $source, $path ?: $source ); $css = $this->move( $converter, $css ); // combine css $content .= $css; } $content = $this->moveImportsToTop( $content ); return $content; } /** * Moving a css file should update all relative urls. * Relative references (e.g. ../images/image.gif) in a certain css file, * will have to be updated when a file is being saved at another location * (e.g. ../../images/image.gif, if the new CSS file is 1 folder deeper). * * @param ConverterInterface $converter Relative path converter * @param string $content The CSS content to update relative urls for * * @return string */ protected function move( ConverterInterface $converter, $content ) { /* * Relative path references will usually be enclosed by url(). @import * is an exception, where url() is not necessary around the path (but is * allowed). * This *could* be 1 regular expression, where both regular expressions * in this array are on different sides of a |. But we're using named * patterns in both regexes, the same name on both regexes. This is only * possible with a (?J) modifier, but that only works after a fairly * recent PCRE version. That's why I'm doing 2 separate regular * expressions & combining the matches after executing of both. */ $relativeRegexes = array( // url(xxx) '/ # open url() url\( \s* # open path enclosure (?P<quotes>["\'])? # fetch path (?P<path>.+?) # close path enclosure (?(quotes)(?P=quotes)) \s* # close url() \) /ix', // @import "xxx" '/ # import statement @import # whitespace \s+ # we don\'t have to check for @import url(), because the # condition above will already catch these # open path enclosure (?P<quotes>["\']) # fetch path (?P<path>.+?) # close path enclosure (?P=quotes) /ix', ); // find all relative urls in css $matches = array(); foreach ( $relativeRegexes as $relativeRegex ) { if ( preg_match_all( $relativeRegex, $content, $regexMatches, PREG_SET_ORDER ) ) { $matches = array_merge( $matches, $regexMatches ); } } $search = array(); $replace = array(); // loop all urls foreach ( $matches as $match ) { // determine if it's a url() or an @import match $type = ( strpos( $match[0], '@import' ) === 0 ? 'import' : 'url' ); $url = $match['path']; if ( $this->canImportByPath( $url ) ) { // attempting to interpret GET-params makes no sense, so let's discard them for awhile $params = strrchr( $url, '?' ); $url = $params ? substr( $url, 0, -strlen( $params ) ) : $url; // fix relative url $url = $converter->convert( $url ); // now that the path has been converted, re-apply GET-params $url .= $params; } /* * Urls with control characters above 0x7e should be quoted. * According to Mozilla's parser, whitespace is only allowed at the * end of unquoted urls. * Urls with `)` (as could happen with data: uris) should also be * quoted to avoid being confused for the url() closing parentheses. * And urls with a # have also been reported to cause issues. * Urls with quotes inside should also remain escaped. * * @see https://developer.mozilla.org/nl/docs/Web/CSS/url#The_url()_functional_notation * @see https://hg.mozilla.org/mozilla-central/rev/14abca4e7378 * @see https://github.com/matthiasmullie/minify/issues/193 */ $url = trim( $url ); if ( preg_match( '/[\s\)\'"#\x{7f}-\x{9f}]/u', $url ) ) { $url = $match['quotes'] . $url . $match['quotes']; } // build replacement $search[] = $match[0]; if ( $type === 'url' ) { $replace[] = 'url(' . $url . ')'; } elseif ( $type === 'import' ) { $replace[] = '@import "' . $url . '"'; } } // replace urls return str_replace( $search, $replace, $content ); } /** * Shorthand HEX color codes. * #FF0000FF -> #f00 -> red * #FF00FF00 -> transparent. * * @param string $content The CSS content to shorten the HEX color codes for * * @return string */ protected function shortenHexColors( $content ) { // shorten repeating patterns within HEX .. $content = preg_replace( '/(?<=[: ])#([0-9a-f])\\1([0-9a-f])\\2([0-9a-f])\\3(?:([0-9a-f])\\4)?(?=[; }])/i', '#$1$2$3$4', $content ); // remove alpha channel if it's pointless .. $content = preg_replace( '/(?<=[: ])#([0-9a-f]{6})ff(?=[; }])/i', '#$1', $content ); $content = preg_replace( '/(?<=[: ])#([0-9a-f]{3})f(?=[; }])/i', '#$1', $content ); // replace `transparent` with shortcut .. $content = preg_replace( '/(?<=[: ])#[0-9a-f]{6}00(?=[; }])/i', '#fff0', $content ); $colors = array( // make these more readable '#00f' => 'blue', '#dc143c' => 'crimson', '#0ff' => 'cyan', '#8b0000' => 'darkred', '#696969' => 'dimgray', '#ff69b4' => 'hotpink', '#0f0' => 'lime', '#fdf5e6' => 'oldlace', '#87ceeb' => 'skyblue', '#d8bfd8' => 'thistle', // we can shorten some even more by replacing them with their color name '#f0ffff' => 'azure', '#f5f5dc' => 'beige', '#ffe4c4' => 'bisque', '#a52a2a' => 'brown', '#ff7f50' => 'coral', '#ffd700' => 'gold', '#808080' => 'gray', '#008000' => 'green', '#4b0082' => 'indigo', '#fffff0' => 'ivory', '#f0e68c' => 'khaki', '#faf0e6' => 'linen', '#800000' => 'maroon', '#000080' => 'navy', '#808000' => 'olive', '#ffa500' => 'orange', '#da70d6' => 'orchid', '#cd853f' => 'peru', '#ffc0cb' => 'pink', '#dda0dd' => 'plum', '#800080' => 'purple', '#f00' => 'red', '#fa8072' => 'salmon', '#a0522d' => 'sienna', '#c0c0c0' => 'silver', '#fffafa' => 'snow', '#d2b48c' => 'tan', '#008080' => 'teal', '#ff6347' => 'tomato', '#ee82ee' => 'violet', '#f5deb3' => 'wheat', // or the other way around 'black' => '#000', 'fuchsia' => '#f0f', 'magenta' => '#f0f', 'white' => '#fff', 'yellow' => '#ff0', // and also `transparent` 'transparent' => '#fff0', ); return preg_replace_callback( '/(?<=[: ])(' . implode( '|', array_keys( $colors ) ) . ')(?=[; }])/i', function ( $match ) use ( $colors ) { return $colors[ strtolower( $match[0] ) ]; }, $content ); } /** * Convert RGB|HSL color codes. * rgb(255,0,0,.5) -> rgb(255 0 0 / .5). * rgb(255,0,0) -> #f00. * * @param string $content The CSS content to shorten the RGB color codes for * * @return string */ protected function convertLegacyColors( $content ) { /* https://drafts.csswg.org/css-color/#color-syntax-legacy https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/rgb https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/hsl */ // convert legacy color syntax $content = preg_replace( '/(rgb)a?\(\s*([0-9]{1,3}%?)\s*,\s*([0-9]{1,3}%?)\s*,\s*([0-9]{1,3}%?)\s*,\s*([0,1]?(?:\.[0-9]*)?)\s*\)/i', '$1($2 $3 $4 / $5)', $content ); $content = preg_replace( '/(rgb)a?\(\s*([0-9]{1,3}%?)\s*,\s*([0-9]{1,3}%?)\s*,\s*([0-9]{1,3}%?)\s*\)/i', '$1($2 $3 $4)', $content ); $content = preg_replace( '/(hsl)a?\(\s*([0-9]+(?:deg|grad|rad|turn)?)\s*,\s*([0-9]{1,3}%)\s*,\s*([0-9]{1,3}%)\s*,\s*([0,1]?(?:\.[0-9]*)?)\s*\)/i', '$1($2 $3 $4 / $5)', $content ); $content = preg_replace( '/(hsl)a?\(\s*([0-9]+(?:deg|grad|rad|turn)?)\s*,\s*([0-9]{1,3}%)\s*,\s*([0-9]{1,3}%)\s*\)/i', '$1($2 $3 $4)', $content ); // convert `rgb` to `hex` $dec = '([01]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])'; return preg_replace_callback( "/rgb\($dec $dec $dec\)/i", function ( $match ) { return sprintf( '#%02x%02x%02x', $match[1], $match[2], $match[3] ); }, $content ); } /** * Cleanup RGB|HSL|HWB|LCH|LAB * rgb(255 0 0 / 1) -> rgb(255 0 0). * rgb(255 0 0 / 0) -> transparent. * * @param string $content The CSS content to cleanup HSL|HWB|LCH|LAB * * @return string */ protected function cleanupModernColors( $content ) { /* https://drafts.csswg.org/css-color/#color-syntax-modern https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/hwb https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/lch https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/lab https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/oklch https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/oklab */ $tag = '(rgb|hsl|hwb|(?:(?:ok)?(?:lch|lab)))'; // remove alpha channel if it's pointless .. $content = preg_replace( '/' . $tag . '\(\s*([^\s]+)\s+([^\s]+)\s+([^\s]+)\s+\/\s+1(?:(?:\.\d?)*|00%)?\s*\)/i', '$1($2 $3 $4)', $content ); // replace `transparent` with shortcut .. $content = preg_replace( '/' . $tag . '\(\s*[^\s]+\s+[^\s]+\s+[^\s]+\s+\/\s+0(?:[\.0%]*)?\s*\)/i', '#fff0', $content ); return $content; } /** * Shorten CSS font weights. * * @param string $content The CSS content to shorten the font weights for * * @return string */ protected function shortenFontWeights( $content ) { $weights = array( 'normal' => 400, 'bold' => 700, ); $callback = function ( $match ) use ( $weights ) { return $match[1] . $weights[ $match[2] ]; }; return preg_replace_callback( '/(font-weight\s*:\s*)(' . implode( '|', array_keys( $weights ) ) . ')(?=[;}])/', $callback, $content ); } /** * Shorthand 0 values to plain 0, instead of e.g. -0em. * * @param string $content The CSS content to shorten the zero values for * * @return string */ protected function shortenZeroes( $content ) { // we don't want to strip units in `calc()` expressions: // `5px - 0px` is valid, but `5px - 0` is not // `10px * 0` is valid (equates to 0), and so is `10 * 0px`, but // `10 * 0` is invalid // we've extracted calcs earlier, so we don't need to worry about this // reusable bits of code throughout these regexes: // before & after are used to make sure we don't match lose unintended // 0-like values (e.g. in #000, or in http://url/1.0) // units can be stripped from 0 values, or used to recognize non 0 // values (where wa may be able to strip a .0 suffix) $before = '(?<=[:(, ])'; $after = '(?=[ ,);}])'; $units = '(em|ex|%|px|cm|mm|in|pt|pc|ch|rem|vh|vw|vmin|vmax|vm)'; // strip units after zeroes (0px -> 0) // NOTE: it should be safe to remove all units for a 0 value, but in // practice, Webkit (especially Safari) seems to stumble over at least // 0%, potentially other units as well. Only stripping 'px' for now. // @see https://github.com/matthiasmullie/minify/issues/60 $content = preg_replace( '/' . $before . '(-?0*(\.0+)?)(?<=0)px' . $after . '/', '\\1', $content ); // strip 0-digits (.0 -> 0) $content = preg_replace( '/' . $before . '\.0+' . $units . '?' . $after . '/', '0\\1', $content ); // strip trailing 0: 50.10 -> 50.1, 50.10px -> 50.1px $content = preg_replace( '/' . $before . '(-?[0-9]+\.[0-9]+)0+' . $units . '?' . $after . '/', '\\1\\2', $content ); // strip trailing 0: 50.00 -> 50, 50.00px -> 50px $content = preg_replace( '/' . $before . '(-?[0-9]+)\.0+' . $units . '?' . $after . '/', '\\1\\2', $content ); // strip leading 0: 0.1 -> .1, 01.1 -> 1.1 $content = preg_replace( '/' . $before . '(-?)0+([0-9]*\.[0-9]+)' . $units . '?' . $after . '/', '\\1\\2\\3', $content ); // strip negative zeroes (-0 -> 0) & truncate zeroes (00 -> 0) $content = preg_replace( '/' . $before . '-?0+' . $units . '?' . $after . '/', '0\\1', $content ); // IE doesn't seem to understand a unitless flex-basis value (correct - // it goes against the spec), so let's add it in again (make it `%`, // which is only 1 char: 0%, 0px, 0 anything, it's all just the same) // @see https://developer.mozilla.org/nl/docs/Web/CSS/flex $content = preg_replace( '/flex:([0-9]+\s[0-9]+\s)0([;\}])/', 'flex:${1}0%${2}', $content ); $content = preg_replace( '/flex-basis:0([;\}])/', 'flex-basis:0%${1}', $content ); return $content; } /** * Strip empty tags from source code. * * @param string $content * * @return string */ protected function stripEmptyTags( $content ) { $content = preg_replace( '/(?<=^)[^\{\};]+\{\s*\}/', '', $content ); $content = preg_replace( '/(?<=(\}|;))[^\{\};]+\{\s*\}/', '', $content ); return $content; } /** * Strip comments from source code. */ protected function stripComments() { $this->stripMultilineComments(); } /** * Strip whitespace. * * @param string $content The CSS content to strip the whitespace for * * @return string */ protected function stripWhitespace( $content ) { // remove leading & trailing whitespace $content = preg_replace( '/^\s*/m', '', $content ); $content = preg_replace( '/\s*$/m', '', $content ); // replace newlines with a single space $content = preg_replace( '/\s+/', ' ', $content ); // remove whitespace around meta characters // inspired by stackoverflow.com/questions/15195750/minify-compress-css-with-regex $content = preg_replace( '/\s*([\*$~^|]?+=|[{};,>~]|!important\b)\s*/', '$1', $content ); $content = preg_replace( '/([\[(:>\+])\s+/', '$1', $content ); $content = preg_replace( '/\s+([\]\)>\+])/', '$1', $content ); $content = preg_replace( '/\s+(:)(?![^\}]*\{)/', '$1', $content ); // whitespace around + and - can only be stripped inside some pseudo- // classes, like `:nth-child(3+2n)` // not in things like `calc(3px + 2px)`, shorthands like `3px -2px`, or // selectors like `div.weird- p` $pseudos = array( 'nth-child', 'nth-last-child', 'nth-last-of-type', 'nth-of-type' ); $content = preg_replace( '/:(' . implode( '|', $pseudos ) . ')\(\s*([+-]?)\s*(.+?)\s*([+-]?)\s*(.*?)\s*\)/', ':$1($2$3$4$5)', $content ); // remove semicolon/whitespace followed by closing bracket $content = str_replace( ';}', '}', $content ); return trim( $content ); } /** * Replace all occurrences of functions that may contain math, where * whitespace around operators needs to be preserved (e.g. calc, clamp). */ protected function extractMath() { $functions = array( 'calc', 'clamp', 'min', 'max' ); $pattern = '/\b(' . implode( '|', $functions ) . ')(\(.+?)(?=$|;|})/m'; // PHP only supports $this inside anonymous functions since 5.4 $minifier = $this; $callback = function ( $match ) use ( $minifier, $pattern, &$callback ) { $function = $match[1]; $length = strlen( $match[2] ); $expr = ''; $opened = 0; // the regular expression for extracting math has 1 significant problem: // it can't determine the correct closing parenthesis... // instead, it'll match a larger portion of code to where it's certain that // the calc() musts have ended, and we'll figure out which is the correct // closing parenthesis here, by counting how many have opened for ( $i = 0; $i < $length; ++$i ) { $char = $match[2][ $i ]; $expr .= $char; if ( $char === '(' ) { ++$opened; } elseif ( $char === ')' && --$opened === 0 ) { break; } } // now that we've figured out where the calc() starts and ends, extract it $count = count( $minifier->extracted ); $placeholder = 'math(' . $count . ')'; $minifier->extracted[ $placeholder ] = $function . '(' . trim( substr( $expr, 1, -1 ) ) . ')'; // and since we've captured more code than required, we may have some leftover // calc() in here too - go recursive on the remaining but of code to go figure // that out and extract what is needed $rest = $minifier->str_replace_first( $function . $expr, '', $match[0] ); $rest = preg_replace_callback( $pattern, $callback, $rest ); return $placeholder . $rest; }; $this->registerPattern( $pattern, $callback ); } /** * Replace custom properties, whose values may be used in scenarios where * we wouldn't want them to be minified (e.g. inside calc). */ protected function extractCustomProperties() { // PHP only supports $this inside anonymous functions since 5.4 $minifier = $this; $this->registerPattern( '/(?<=^|[;}{])\s*(--[^:;{}"\'\s]+)\s*:([^;{}]+)/m', function ( $match ) use ( $minifier ) { $placeholder = '--custom-' . count( $minifier->extracted ) . ':0'; $minifier->extracted[ $placeholder ] = $match[1] . ':' . trim( $match[2] ); return $placeholder; } ); } /** * Check if file is small enough to be imported. * * @param string $path The path to the file * * @return bool */ protected function canImportBySize( $path ) { return ( $size = @filesize( $path ) ) && $size <= $this->maxImportSize * 1024; } /** * Check if file a file can be imported, going by the path. * * @param string $path * * @return bool */ protected function canImportByPath( $path ) { return preg_match( '/^(data:|https?:|\\/)/', $path ) === 0; } /** * Return a converter to update relative paths to be relative to the new * destination. * * @param string $source * @param string $target * * @return ConverterInterface */ protected function getPathConverter( $source, $target ) { return new Converter( $source, $target ); } }