diff options
Diffstat (limited to 'libs/minify/src/JS.php')
| -rwxr-xr-x | libs/minify/src/JS.php | 612 |
1 files changed, 612 insertions, 0 deletions
diff --git a/libs/minify/src/JS.php b/libs/minify/src/JS.php new file mode 100755 index 00000000..92389cdd --- /dev/null +++ b/libs/minify/src/JS.php @@ -0,0 +1,612 @@ +<?php +/** + * 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 + * + * 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. + * + * @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()); + + $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() + { + // 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; + }; + // multi-line comments + $this->registerPattern('/\n?\/\*(!|.*?@license|.*?@preserve).*?\*\/\n?/s', $callback); + $this->registerPattern('/\/\*.*?\*\//s', ''); + + // 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. + */ + $content = preg_replace('/(for\([^;\{]*;[^;\{]*;[^;\{]*\));(\}|$)/s', '\\1;;\\2', $content); + $content = preg_replace('/(for\([^;\{]+\s+in\s+[^;\{]+\));(\}|$)/s', '\\1;;\\2', $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; + } +} |