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Developer Documentation
See Release Notes
Long Term Support Release
- Bug fixes for general core bugs in 3.9.x will end* 10 May 2021 (12 months).
- Bug fixes for security issues in 3.9.x will end* 8 May 2023 (36 months).
- PHP version: minimum PHP 7.2.0 Note: minimum PHP version has increased since Moodle 3.8. PHP 7.3.x and 7.4.x are supported too.
/lib/minify/matthiasmullie-minify/src/ -> JS.php (source)
<?php>/**< * JavaScript minifier> * JavaScript minifier.* * Please report bugs on https://github.com/matthiasmullie/minify/issues * * @author Matthias Mullie <minify@mullie.eu> * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved * @license MIT License */>namespace MatthiasMullie\Minify; /**< * JavaScript Minifier Class> * JavaScript Minifier Class.* * Please report bugs on https://github.com/matthiasmullie/minify/issues *< * @package Minify* @author Matthias Mullie <minify@mullie.eu> * @author Tijs Verkoyen <minify@verkoyen.eu> * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved * @license MIT License */ 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 $operatorsAfter = array(); /** * {@inheritdoc} */ public function __construct() {< call_user_func_array(array('parent', '__construct'), func_get_args());> call_user_func_array(array('\\MatthiasMullie\Minify\\Minify', '__construct'), func_get_args());$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.";";> $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() { // PHP only supports $this inside anonymous functions since 5.4 $minifier = $this; $callback = function ($match) use ($minifier) {> if ( $count = count($minifier->extracted); > substr($match[2], 0, 1) === '!' || $placeholder = '/*'.$count.'*/'; > strpos($match[2], '@license') !== false || $minifier->extracted[$placeholder] = $match[0]; > strpos($match[2], '@preserve') !== false > ) { return $placeholder; > // preserve multi-line comments that start with /*! }; > // or contain @license or @preserve annotations< return $placeholder;> return $match[1] . $placeholder . $match[3]; > } > > return $match[1] . $match[3];$this->registerPattern('/\n?\/\*(!|.*?@license|.*?@preserve).*?\*\/\n?/s', $callback);>< $this->registerPattern('/\n?\/\*(!|.*?@license|.*?@preserve).*?\*\/\n?/s', $callback); < $this->registerPattern('/\/\*.*?\*\//s', '');> $this->registerPattern('/(\n?)\/\*(.*?)\*\/(\n?)/s', $callback);// 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*';> $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).')))';> $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.< */ < $content = preg_replace('/(for\([^;\{]*;[^;\{]*;[^;\{]*\));(\}|$)/s', '\\1;;\\2', $content);> * 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);> /* > /* * Below will also keep `;` after a `do{}while();` along with `while();` > * Do the same for the if's that don't have a body but are followed by ;} * While these could be stripped after do-while, detecting this > */ * distinction is cumbersome, so I'll play it safe and make sure `;` > $content = preg_replace('/(\bif\s*\([^{;]*\));\}/s', '\\1;;}', $content); * 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; } }
