* 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
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.
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
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
* E.g.: we shouldn't insert a ; after this else
* console.log('this is quite fine')
* Will be loaded from /data/js/keywords_before.txt
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
* Will be loaded from /data/js/keywords_after.txt
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
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
* 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
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
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 );
* Perform JS optimizations.
* @param string[optional] $path Path to write the data to
* @return string The minified data
public function execute( $path = null ) {
* 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:
* Comments will be removed altogether, strings and regular expressions
* will be replaced by placeholder text, which we'll restore later.
$this->extractStrings( '\'"`' );
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 ;
// 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 );
* Strip comments from source code.
protected function stripComments() {
$this->stripMultilineComments();
$this->registerPattern( '/\/\/.*$/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
* 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
$callback = function ( $match ) use ( $minifier ) {
$count = count( $minifier->extracted );
$placeholder = '"' . $count . '"';
$minifier->extracted[ $placeholder ] = $match[0];
// match all chars except `/` and `\`
// `\` is allowed though, along with whatever char follows (which is the
// this should allow all chars, except for an unescaped `/` (= the one
// 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
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Methods_2
$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
$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 );
* 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
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['-'] );
'/(' . implode( '|', $operatorsBefore ) . ')\s+/',
'/\s+(' . implode( '|', $operatorsAfter ) . ')/',
// make sure + and - can't be mistaken for, or joined into ++ and --
'/(?<![\+\-])\s*([\+\-])(?![\+\-])/',
'/(?<![\+\-])([\+\-])\s*(?![\+\-])/',
// 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
$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
* 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
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 . '])\=';
* 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
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 );
return '\b' . $value . '\b';
$keywords = array_combine( $keywords, $escaped );
* Replaces all occurrences of array['key'] by array.key.
protected function propertyNotation( $content ) {
// PHP only supports $this inside anonymous functions since 5.4
$keywords = $this->keywordsReserved;
It is recommended that you Edit text format, this type of Fix handles quite a lot in one request
