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<?php /** * js.cls.php - modified PHP implementation of Matthias Mullie's JavaScript minifier * * @author Matthias Mullie <minify@mullie.eu> * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved * @license MIT License */ namespace LiteSpeed\Lib\CSS_JS_MIN\Minify; defined( 'WPINC' ) || exit; class JS extends Minify { /** * Var-matching regex based on http://stackoverflow.com/a/9337047/802993. * * Note that regular expressions using that bit must have the PCRE_UTF8 * pattern modifier (/u) set. * * @internal * * @var string */ const REGEX_VARIABLE = 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/** * Full list of JavaScript reserved words. * Will be loaded from /data/js/keywords_reserved.txt. * * @see https://mathiasbynens.be/notes/reserved-keywords * * @var string[] */ protected $keywordsReserved = array(); /** * List of JavaScript reserved words that accept a <variable, value, ...> * after them. Some end of lines are not the end of a statement, like with * these keywords. * * E.g.: we shouldn't insert a ; after this else * else * console.log('this is quite fine') * * Will be loaded from /data/js/keywords_before.txt * * @var string[] */ protected $keywordsBefore = array(); /** * List of JavaScript reserved words that accept a <variable, value, ...> * before them. Some end of lines are not the end of a statement, like when * continued by one of these keywords on the newline. * * E.g.: we shouldn't insert a ; before this instanceof * variable * instanceof String * * Will be loaded from /data/js/keywords_after.txt * * @var string[] */ protected $keywordsAfter = array(); /** * List of all JavaScript operators. * * Will be loaded from /data/js/operators.txt * * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators * * @var string[] */ protected $operators = array(); /** * List of JavaScript operators that accept a <variable, value, ...> after * them. Some end of lines are not the end of a statement, like with these * operators. * * Note: Most operators are fine, we've only removed ++ and --. * ++ & -- have to be joined with the value they're in-/decrementing. * * Will be loaded from /data/js/operators_before.txt * * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators * * @var string[] */ protected $operatorsBefore = array(); /** * List of JavaScript operators that accept a <variable, value, ...> before * them. Some end of lines are not the end of a statement, like when * continued by one of these operators on the newline. * * Note: Most operators are fine, we've only removed ), ], ++, --, ! and ~. * There can't be a newline separating ! or ~ and whatever it is negating. * ++ & -- have to be joined with the value they're in-/decrementing. * ) & ] are "special" in that they have lots or usecases. () for example * is used for function calls, for grouping, in if () and for (), ... * * Will be loaded from /data/js/operators_after.txt * * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators * * @var string[] */ protected $operatorsAfter = array(); public function __construct() { call_user_func_array( array( '\\LiteSpeed\\Lib\\CSS_JS_MIN\\Minify\\Minify', '__construct' ), func_get_args() ); $dataDir = __DIR__ . '/data/js/'; $options = FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES; $this->keywordsReserved = file( $dataDir . 'keywords_reserved.txt', $options ); $this->keywordsBefore = file( $dataDir . 'keywords_before.txt', $options ); $this->keywordsAfter = file( $dataDir . 'keywords_after.txt', $options ); $this->operators = file( $dataDir . 'operators.txt', $options ); $this->operatorsBefore = file( $dataDir . 'operators_before.txt', $options ); $this->operatorsAfter = file( $dataDir . 'operators_after.txt', $options ); } /** * Minify the data. * Perform JS optimizations. * * @param string[optional] $path Path to write the data to * * @return string The minified data */ public function execute( $path = null ) { $content = ''; /* * Let's first take out strings, comments and regular expressions. * All of these can contain JS code-like characters, and we should make * sure any further magic ignores anything inside of these. * * Consider this example, where we should not strip any whitespace: * var str = "a test"; * * Comments will be removed altogether, strings and regular expressions * will be replaced by placeholder text, which we'll restore later. */ $this->extractStrings( '\'"`' ); $this->stripComments(); $this->extractRegex(); // loop files foreach ( $this->data as $source => $js ) { // take out strings, comments & regex (for which we've registered // the regexes just a few lines earlier) $js = $this->replace( $js ); $js = $this->propertyNotation( $js ); $js = $this->shortenBools( $js ); $js = $this->stripWhitespace( $js ); // combine js: separating the scripts by a ; $content .= $js . ';'; } // clean up leftover `;`s from the combination of multiple scripts $content = ltrim( $content, ';' ); $content = (string) substr( $content, 0, -1 ); /* * Earlier, we extracted strings & regular expressions and replaced them * with placeholder text. This will restore them. */ $content = $this->restoreExtractedData( $content ); return $content; } /** * Strip comments from source code. */ protected function stripComments() { $this->stripMultilineComments(); // single-line comments $this->registerPattern( '/\/\/.*$/m', '' ); } /** * JS can have /-delimited regular expressions, like: /ab+c/.match(string). * * The content inside the regex can contain characters that may be confused * for JS code: e.g. it could contain whitespace it needs to match & we * don't want to strip whitespace in there. * * The regex can be pretty simple: we don't have to care about comments, * (which also use slashes) because stripComments() will have stripped those * already. * * This method will replace all string content with simple REGEX# * placeholder text, so we've rid all regular expressions from characters * that may be misinterpreted. Original regex content will be saved in * $this->extracted and after doing all other minifying, we can restore the * original content via restoreRegex() */ protected function extractRegex() { // PHP only supports $this inside anonymous functions since 5.4 $minifier = $this; $callback = function ( $match ) use ( $minifier ) { $count = count( $minifier->extracted ); $placeholder = '"' . $count . '"'; $minifier->extracted[ $placeholder ] = $match[0]; return $placeholder; }; // match all chars except `/` and `\` // `\` is allowed though, along with whatever char follows (which is the // one being escaped) // this should allow all chars, except for an unescaped `/` (= the one // closing the regex) // then also ignore bare `/` inside `[]`, where they don't need to be // escaped: anything inside `[]` can be ignored safely $pattern = '\\/(?!\*)(?:[^\\[\\/\\\\\n\r]++|(?:\\\\.)++|(?:\\[(?:[^\\]\\\\\n\r]++|(?:\\\\.)++)++\\])++)++\\/[gimuy]*'; // a regular expression can only be followed by a few operators or some // of the RegExp methods (a `\` followed by a variable or value is // likely part of a division, not a regex) $keywords = array( 'do', 'in', 'new', 'else', 'throw', 'yield', 'delete', 'return', 'typeof' ); $before = '(^|[=:,;\+\-\*\?\/\}\(\{\[&\|!]|' . implode( '|', $keywords ) . ')\s*'; $propertiesAndMethods = array( // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Properties_2 'constructor', 'flags', 'global', 'ignoreCase', 'multiline', 'source', 'sticky', 'unicode', // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Methods_2 'compile(', 'exec(', 'test(', 'toSource(', 'toString(', ); $delimiters = array_fill( 0, count( $propertiesAndMethods ), '/' ); $propertiesAndMethods = array_map( 'preg_quote', $propertiesAndMethods, $delimiters ); $after = '(?=\s*([\.,;:\)\}&\|+]|\/\/|$|\.(' . implode( '|', $propertiesAndMethods ) . ')))'; $this->registerPattern( '/' . $before . '\K' . $pattern . $after . '/', $callback ); // regular expressions following a `)` are rather annoying to detect... // quite often, `/` after `)` is a division operator & if it happens to // be followed by another one (or a comment), it is likely to be // confused for a regular expression // however, it's perfectly possible for a regex to follow a `)`: after // a single-line `if()`, `while()`, ... statement, for example // since, when they occur like that, they're always the start of a // statement, there's only a limited amount of ways they can be useful: // by calling the regex methods directly // if a regex following `)` is not followed by `.<property or method>`, // it's quite likely not a regex $before = '\)\s*'; $after = '(?=\s*\.(' . implode( '|', $propertiesAndMethods ) . '))'; $this->registerPattern( '/' . $before . '\K' . $pattern . $after . '/', $callback ); // 1 more edge case: a regex can be followed by a lot more operators or // keywords if there's a newline (ASI) in between, where the operator // actually starts a new statement // (https://github.com/matthiasmullie/minify/issues/56) $operators = $this->getOperatorsForRegex( $this->operatorsBefore, '/' ); $operators += $this->getOperatorsForRegex( $this->keywordsReserved, '/' ); $after = '(?=\s*\n\s*(' . implode( '|', $operators ) . '))'; $this->registerPattern( '/' . $pattern . $after . '/', $callback ); } /** * Strip whitespace. * * We won't strip *all* whitespace, but as much as possible. The thing that * we'll preserve are newlines we're unsure about. * JavaScript doesn't require statements to be terminated with a semicolon. * It will automatically fix missing semicolons with ASI (automatic semi- * colon insertion) at the end of line causing errors (without semicolon.) * * Because it's sometimes hard to tell if a newline is part of a statement * that should be terminated or not, we'll just leave some of them alone. * * @param string $content The content to strip the whitespace for * * @return string */ protected function stripWhitespace( $content ) { // uniform line endings, make them all line feed $content = str_replace( array( "\r\n", "\r" ), "\n", $content ); // collapse all non-line feed whitespace into a single space $content = preg_replace( '/[^\S\n]+/', ' ', $content ); // strip leading & trailing whitespace $content = str_replace( array( " \n", "\n " ), "\n", $content ); // collapse consecutive line feeds into just 1 $content = preg_replace( '/\n+/', "\n", $content ); $operatorsBefore = $this->getOperatorsForRegex( $this->operatorsBefore, '/' ); $operatorsAfter = $this->getOperatorsForRegex( $this->operatorsAfter, '/' ); $operators = $this->getOperatorsForRegex( $this->operators, '/' ); $keywordsBefore = $this->getKeywordsForRegex( $this->keywordsBefore, '/' ); $keywordsAfter = $this->getKeywordsForRegex( $this->keywordsAfter, '/' ); // strip whitespace that ends in (or next line begin with) an operator // that allows statements to be broken up over multiple lines unset( $operatorsBefore['+'], $operatorsBefore['-'], $operatorsAfter['+'], $operatorsAfter['-'] ); $content = preg_replace( array( '/(' . implode( '|', $operatorsBefore ) . ')\s+/', '/\s+(' . implode( '|', $operatorsAfter ) . ')/', ), '\\1', $content ); // make sure + and - can't be mistaken for, or joined into ++ and -- $content = preg_replace( array( '/(?<![\+\-])\s*([\+\-])(?![\+\-])/', '/(?<![\+\-])([\+\-])\s*(?![\+\-])/', ), '\\1', $content ); // collapse whitespace around reserved words into single space $content = preg_replace( '/(^|[;\}\s])\K(' . implode( '|', $keywordsBefore ) . ')\s+/', '\\2 ', $content ); $content = preg_replace( '/\s+(' . implode( '|', $keywordsAfter ) . ')(?=([;\{\s]|$))/', ' \\1', $content ); /* * We didn't strip whitespace after a couple of operators because they * could be used in different contexts and we can't be sure it's ok to * strip the newlines. However, we can safely strip any non-line feed * whitespace that follows them. */ $operatorsDiffBefore = array_diff( $operators, $operatorsBefore ); $operatorsDiffAfter = array_diff( $operators, $operatorsAfter ); $content = preg_replace( '/(' . implode( '|', $operatorsDiffBefore ) . ')[^\S\n]+/', '\\1', $content ); $content = preg_replace( '/[^\S\n]+(' . implode( '|', $operatorsDiffAfter ) . ')/', '\\1', $content ); /* * Whitespace after `return` can be omitted in a few occasions * (such as when followed by a string or regex) * Same for whitespace in between `)` and `{`, or between `{` and some * keywords. */ $content = preg_replace( '/\breturn\s+(["\'\/\+\-])/', 'return$1', $content ); $content = preg_replace( '/\)\s+\{/', '){', $content ); $content = preg_replace( '/}\n(else|catch|finally)\b/', '}$1', $content ); /* * Get rid of double semicolons, except where they can be used like: * "for(v=1,_=b;;)", "for(v=1;;v++)" or "for(;;ja||(ja=true))". * I'll safeguard these double semicolons inside for-loops by * temporarily replacing them with an invalid condition: they won't have * a double semicolon and will be easy to spot to restore afterwards. */ $content = preg_replace( '/\bfor\(([^;]*);;([^;]*)\)/', 'for(\\1;-;\\2)', $content ); $content = preg_replace( '/;+/', ';', $content ); $content = preg_replace( '/\bfor\(([^;]*);-;([^;]*)\)/', 'for(\\1;;\\2)', $content ); /* * Next, we'll be removing all semicolons where ASI kicks in. * for-loops however, can have an empty body (ending in only a * semicolon), like: `for(i=1;i<3;i++);`, of `for(i in list);` * Here, nothing happens during the loop; it's just used to keep * increasing `i`. With that ; omitted, the next line would be expected * to be the for-loop's body... Same goes for while loops. * I'm going to double that semicolon (if any) so after the next line, * which strips semicolons here & there, we're still left with this one. * Note the special recursive construct in the three inner parts of the for: * (\{([^\{\}]*(?-2))*[^\{\}]*\})? - it is intended to match inline * functions bodies, e.g.: i<arr.map(function(e){return e}).length. * Also note that the construct is applied only once and multiplied * for each part of the for, otherwise it risks a catastrophic backtracking. * The limitation is that it will not allow closures in more than one * of the three parts for a specific for() case. * REGEX throwing catastrophic backtracking: $content = preg_replace('/(for\([^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*;[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*;[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*\));(\}|$)/s', '\\1;;\\8', $content); */ $content = preg_replace( '/(for\((?:[^;\{]*|[^;\{]*function[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*);[^;\{]*;[^;\{]*\));(\}|$)/s', '\\1;;\\4', $content ); $content = preg_replace( '/(for\([^;\{]*;(?:[^;\{]*|[^;\{]*function[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*);[^;\{]*\));(\}|$)/s', '\\1;;\\4', $content ); $content = preg_replace( '/(for\([^;\{]*;[^;\{]*;(?:[^;\{]*|[^;\{]*function[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*)\));(\}|$)/s', '\\1;;\\4', $content ); $content = preg_replace( '/(for\([^;\{]+\s+in\s+[^;\{]+\));(\}|$)/s', '\\1;;\\2', $content ); /* * Do the same for the if's that don't have a body but are followed by ;} */ $content = preg_replace( '/(\bif\s*\([^{;]*\));\}/s', '\\1;;}', $content ); /* * Below will also keep `;` after a `do{}while();` along with `while();` * While these could be stripped after do-while, detecting this * distinction is cumbersome, so I'll play it safe and make sure `;` * after any kind of `while` is kept. */ $content = preg_replace( '/(while\([^;\{]+\));(\}|$)/s', '\\1;;\\2', $content ); /* * We also can't strip empty else-statements. Even though they're * useless and probably shouldn't be in the code in the first place, we * shouldn't be stripping the `;` that follows it as it breaks the code. * We can just remove those useless else-statements completely. * * @see https://github.com/matthiasmullie/minify/issues/91 */ $content = preg_replace( '/else;/s', '', $content ); /* * We also don't really want to terminate statements followed by closing * curly braces (which we've ignored completely up until now) or end-of- * script: ASI will kick in here & we're all about minifying. * Semicolons at beginning of the file don't make any sense either. */ $content = preg_replace( '/;(\}|$)/s', '\\1', $content ); $content = ltrim( $content, ';' ); // get rid of remaining whitespace af beginning/end return trim( $content ); } /** * We'll strip whitespace around certain operators with regular expressions. * This will prepare the given array by escaping all characters. * * @param string[] $operators * @param string $delimiter * * @return string[] */ protected function getOperatorsForRegex( array $operators, $delimiter = '/' ) { // escape operators for use in regex $delimiters = array_fill( 0, count( $operators ), $delimiter ); $escaped = array_map( 'preg_quote', $operators, $delimiters ); $operators = array_combine( $operators, $escaped ); // ignore + & - for now, they'll get special treatment unset( $operators['+'], $operators['-'] ); // dot can not just immediately follow a number; it can be confused for // decimal point, or calling a method on it, e.g. 42 .toString() $operators['.'] = '(?<![0-9]\s)\.'; // don't confuse = with other assignment shortcuts (e.g. +=) $chars = preg_quote( '+-*\=<>%&|', $delimiter ); $operators['='] = '(?<![' . $chars . '])\='; return $operators; } /** * We'll strip whitespace around certain keywords with regular expressions. * This will prepare the given array by escaping all characters. * * @param string[] $keywords * @param string $delimiter * * @return string[] */ protected function getKeywordsForRegex( array $keywords, $delimiter = '/' ) { // escape keywords for use in regex $delimiter = array_fill( 0, count( $keywords ), $delimiter ); $escaped = array_map( 'preg_quote', $keywords, $delimiter ); // add word boundaries array_walk( $keywords, function ( $value ) { return '\b' . $value . '\b'; } ); $keywords = array_combine( $keywords, $escaped ); return $keywords; } /** * Replaces all occurrences of array['key'] by array.key. * * @param string $content * * @return string */ protected function propertyNotation( $content ) { // PHP only supports $this inside anonymous functions since 5.4 $minifier = $this; $keywords = $this->keywordsReserved; $callback = function ( $match ) use ( $minifier, $keywords ) { $property = trim( $minifier->extracted[ $match[1] ], '\'"' ); /* * Check if the property is a reserved keyword. In this context (as * property of an object literal/array) it shouldn't matter, but IE8 * freaks out with "Expected identifier". */ if ( in_array( $property, $keywords ) ) { return $match[0]; } /* * See if the property is in a variable-like format (e.g. * array['key-here'] can't be replaced by array.key-here since '-' * is not a valid character there. */ if ( ! preg_match( '/^' . $minifier::REGEX_VARIABLE . '$/u', $property ) ) { return $match[0]; } return '.' . $property; }; /* * Figure out if previous character is a variable name (of the array * we want to use property notation on) - this is to make sure * standalone ['value'] arrays aren't confused for keys-of-an-array. * We can (and only have to) check the last character, because PHP's * regex implementation doesn't allow unfixed-length look-behind * assertions. */ preg_match( '/(\[[^\]]+\])[^\]]*$/', static::REGEX_VARIABLE, $previousChar ); $previousChar = $previousChar[1]; /* * Make sure word preceding the ['value'] is not a keyword, e.g. * return['x']. Because -again- PHP's regex implementation doesn't allow * unfixed-length look-behind assertions, I'm just going to do a lot of * separate look-behind assertions, one for each keyword. */ $keywords = $this->getKeywordsForRegex( $keywords ); $keywords = '(?<!' . implode( ')(?<!', $keywords ) . ')'; return preg_replace_callback( '/(?<=' . $previousChar . '|\])' . $keywords . '\[\s*(([\'"])[0-9]+\\2)\s*\]/u', $callback, $content ); } /** * Replaces true & false by !0 and !1. * * @param string $content * * @return string */ protected function shortenBools( $content ) { /* * 'true' or 'false' could be used as property names (which may be * followed by whitespace) - we must not replace those! * Since PHP doesn't allow variable-length (to account for the * whitespace) lookbehind assertions, I need to capture the leading * character and check if it's a `.` */ $callback = function ( $match ) { if ( trim( $match[1] ) === '.' ) { return $match[0]; } return $match[1] . ( $match[2] === 'true' ? '!0' : '!1' ); }; $content = preg_replace_callback( '/(^|.\s*)\b(true|false)\b(?!:)/', $callback, $content ); // for(;;) is exactly the same as while(true), but shorter :) $content = preg_replace( '/\bwhile\(!0\){/', 'for(;;){', $content ); // now make sure we didn't turn any do ... while(true) into do ... for(;;) preg_match_all( '/\bdo\b/', $content, $dos, PREG_OFFSET_CAPTURE | PREG_SET_ORDER ); // go backward to make sure positional offsets aren't altered when $content changes $dos = array_reverse( $dos ); foreach ( $dos as $do ) { $offsetDo = $do[0][1]; // find all `while` (now `for`) following `do`: one of those must be // associated with the `do` and be turned back into `while` preg_match_all( '/\bfor\(;;\)/', $content, $whiles, PREG_OFFSET_CAPTURE | PREG_SET_ORDER, $offsetDo ); foreach ( $whiles as $while ) { $offsetWhile = $while[0][1]; $open = substr_count( $content, '{', $offsetDo, $offsetWhile - $offsetDo ); $close = substr_count( $content, '}', $offsetDo, $offsetWhile - $offsetDo ); if ( $open === $close ) { // only restore `while` if amount of `{` and `}` are the same; // otherwise, that `for` isn't associated with this `do` $content = substr_replace( $content, 'while(!0)', $offsetWhile, strlen( 'for(;;)' ) ); break; } } } return $content; } }