Файл: contao-3.5.8/vendor/matthiasmullie/minify/src/JS.php
Строк: 686
<?php
namespace MatthiasMullieMinify;
/**
* JavaScript minifier.
*
* Please report bugs on https://github.com/matthiasmullie/minify/issues
*
* @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 = 'b[$A-Z_a-zxaaxb5xbaxc0-xd6xd8-xf6xf8-x{02c1}x{02c6}-x{02d1}x{02e0}-x{02e4}x{02ec}x{02ee}x{0370}-x{0374}x{0376}x{0377}x{037a}-x{037d}x{0386}x{0388}-x{038a}x{038c}x{038e}-x{03a1}x{03a3}-x{03f5}x{03f7}-x{0481}x{048a}-x{0527}x{0531}-x{0556}x{0559}x{0561}-x{0587}x{05d0}-x{05ea}x{05f0}-x{05f2}x{0620}-x{064a}x{066e}x{066f}x{0671}-x{06d3}x{06d5}x{06e5}x{06e6}x{06ee}x{06ef}x{06fa}-x{06fc}x{06ff}x{0710}x{0712}-x{072f}x{074d}-x{07a5}x{07b1}x{07ca}-x{07ea}x{07f4}x{07f5}x{07fa}x{0800}-x{0815}x{081a}x{0824}x{0828}x{0840}-x{0858}x{08a0}x{08a2}-x{08ac}x{0904}-x{0939}x{093d}x{0950}x{0958}-x{0961}x{0971}-x{0977}x{0979}-x{097f}x{0985}-x{098c}x{098f}x{0990}x{0993}-x{09a8}x{09aa}-x{09b0}x{09b2}x{09b6}-x{09b9}x{09bd}x{09ce}x{09dc}x{09dd}x{09df}-x{09e1}x{09f0}x{09f1}x{0a05}-x{0a0a}x{0a0f}x{0a10}x{0a13}-x{0a28}x{0a2a}-x{0a30}x{0a32}x{0a33}x{0a35}x{0a36}x{0a38}x{0a39}x{0a59}-x{0a5c}x{0a5e}x{0a72}-x{0a74}x{0a85}-x{0a8d}x{0a8f}-x{0a91}x{0a93}-x{0aa8}x{0aaa}-x{0ab0}x{0ab2}x{0ab3}x{0ab5}-x{0ab9}x{0abd}x{0ad0}x{0ae0}x{0ae1}x{0b05}-x{0b0c}x{0b0f}x{0b10}x{0b13}-x{0b28}x{0b2a}-x{0b30}x{0b32}x{0b33}x{0b35}-x{0b39}x{0b3d}x{0b5c}x{0b5d}x{0b5f}-x{0b61}x{0b71}x{0b83}x{0b85}-x{0b8a}x{0b8e}-x{0b90}x{0b92}-x{0b95}x{0b99}x{0b9a}x{0b9c}x{0b9e}x{0b9f}x{0ba3}x{0ba4}x{0ba8}-x{0baa}x{0bae}-x{0bb9}x{0bd0}x{0c05}-x{0c0c}x{0c0e}-x{0c10}x{0c12}-x{0c28}x{0c2a}-x{0c33}x{0c35}-x{0c39}x{0c3d}x{0c58}x{0c59}x{0c60}x{0c61}x{0c85}-x{0c8c}x{0c8e}-x{0c90}x{0c92}-x{0ca8}x{0caa}-x{0cb3}x{0cb5}-x{0cb9}x{0cbd}x{0cde}x{0ce0}x{0ce1}x{0cf1}x{0cf2}x{0d05}-x{0d0c}x{0d0e}-x{0d10}x{0d12}-x{0d3a}x{0d3d}x{0d4e}x{0d60}x{0d61}x{0d7a}-x{0d7f}x{0d85}-x{0d96}x{0d9a}-x{0db1}x{0db3}-x{0dbb}x{0dbd}x{0dc0}-x{0dc6}x{0e01}-x{0e30}x{0e32}x{0e33}x{0e40}-x{0e46}x{0e81}x{0e82}x{0e84}x{0e87}x{0e88}x{0e8a}x{0e8d}x{0e94}-x{0e97}x{0e99}-x{0e9f}x{0ea1}-x{0ea3}x{0ea5}x{0ea7}x{0eaa}x{0eab}x{0ead}-x{0eb0}x{0eb2}x{0eb3}x{0ebd}x{0ec0}-x{0ec4}x{0ec6}x{0edc}-x{0edf}x{0f00}x{0f40}-x{0f47}x{0f49}-x{0f6c}x{0f88}-x{0f8c}x{1000}-x{102a}x{103f}x{1050}-x{1055}x{105a}-x{105d}x{1061}x{1065}x{1066}x{106e}-x{1070}x{1075}-x{1081}x{108e}x{10a0}-x{10c5}x{10c7}x{10cd}x{10d0}-x{10fa}x{10fc}-x{1248}x{124a}-x{124d}x{1250}-x{1256}x{1258}x{125a}-x{125d}x{1260}-x{1288}x{128a}-x{128d}x{1290}-x{12b0}x{12b2}-x{12b5}x{12b8}-x{12be}x{12c0}x{12c2}-x{12c5}x{12c8}-x{12d6}x{12d8}-x{1310}x{1312}-x{1315}x{1318}-x{135a}x{1380}-x{138f}x{13a0}-x{13f4}x{1401}-x{166c}x{166f}-x{167f}x{1681}-x{169a}x{16a0}-x{16ea}x{16ee}-x{16f0}x{1700}-x{170c}x{170e}-x{1711}x{1720}-x{1731}x{1740}-x{1751}x{1760}-x{176c}x{176e}-x{1770}x{1780}-x{17b3}x{17d7}x{17dc}x{1820}-x{1877}x{1880}-x{18a8}x{18aa}x{18b0}-x{18f5}x{1900}-x{191c}x{1950}-x{196d}x{1970}-x{1974}x{1980}-x{19ab}x{19c1}-x{19c7}x{1a00}-x{1a16}x{1a20}-x{1a54}x{1aa7}x{1b05}-x{1b33}x{1b45}-x{1b4b}x{1b83}-x{1ba0}x{1bae}x{1baf}x{1bba}-x{1be5}x{1c00}-x{1c23}x{1c4d}-x{1c4f}x{1c5a}-x{1c7d}x{1ce9}-x{1cec}x{1cee}-x{1cf1}x{1cf5}x{1cf6}x{1d00}-x{1dbf}x{1e00}-x{1f15}x{1f18}-x{1f1d}x{1f20}-x{1f45}x{1f48}-x{1f4d}x{1f50}-x{1f57}x{1f59}x{1f5b}x{1f5d}x{1f5f}-x{1f7d}x{1f80}-x{1fb4}x{1fb6}-x{1fbc}x{1fbe}x{1fc2}-x{1fc4}x{1fc6}-x{1fcc}x{1fd0}-x{1fd3}x{1fd6}-x{1fdb}x{1fe0}-x{1fec}x{1ff2}-x{1ff4}x{1ff6}-x{1ffc}x{2071}x{207f}x{2090}-x{209c}x{2102}x{2107}x{210a}-x{2113}x{2115}x{2119}-x{211d}x{2124}x{2126}x{2128}x{212a}-x{212d}x{212f}-x{2139}x{213c}-x{213f}x{2145}-x{2149}x{214e}x{2160}-x{2188}x{2c00}-x{2c2e}x{2c30}-x{2c5e}x{2c60}-x{2ce4}x{2ceb}-x{2cee}x{2cf2}x{2cf3}x{2d00}-x{2d25}x{2d27}x{2d2d}x{2d30}-x{2d67}x{2d6f}x{2d80}-x{2d96}x{2da0}-x{2da6}x{2da8}-x{2dae}x{2db0}-x{2db6}x{2db8}-x{2dbe}x{2dc0}-x{2dc6}x{2dc8}-x{2dce}x{2dd0}-x{2dd6}x{2dd8}-x{2dde}x{2e2f}x{3005}-x{3007}x{3021}-x{3029}x{3031}-x{3035}x{3038}-x{303c}x{3041}-x{3096}x{309d}-x{309f}x{30a1}-x{30fa}x{30fc}-x{30ff}x{3105}-x{312d}x{3131}-x{318e}x{31a0}-x{31ba}x{31f0}-x{31ff}x{3400}-x{4db5}x{4e00}-x{9fcc}x{a000}-x{a48c}x{a4d0}-x{a4fd}x{a500}-x{a60c}x{a610}-x{a61f}x{a62a}x{a62b}x{a640}-x{a66e}x{a67f}-x{a697}x{a6a0}-x{a6ef}x{a717}-x{a71f}x{a722}-x{a788}x{a78b}-x{a78e}x{a790}-x{a793}x{a7a0}-x{a7aa}x{a7f8}-x{a801}x{a803}-x{a805}x{a807}-x{a80a}x{a80c}-x{a822}x{a840}-x{a873}x{a882}-x{a8b3}x{a8f2}-x{a8f7}x{a8fb}x{a90a}-x{a925}x{a930}-x{a946}x{a960}-x{a97c}x{a984}-x{a9b2}x{a9cf}x{aa00}-x{aa28}x{aa40}-x{aa42}x{aa44}-x{aa4b}x{aa60}-x{aa76}x{aa7a}x{aa80}-x{aaaf}x{aab1}x{aab5}x{aab6}x{aab9}-x{aabd}x{aac0}x{aac2}x{aadb}-x{aadd}x{aae0}-x{aaea}x{aaf2}-x{aaf4}x{ab01}-x{ab06}x{ab09}-x{ab0e}x{ab11}-x{ab16}x{ab20}-x{ab26}x{ab28}-x{ab2e}x{abc0}-x{abe2}x{ac00}-x{d7a3}x{d7b0}-x{d7c6}x{d7cb}-x{d7fb}x{f900}-x{fa6d}x{fa70}-x{fad9}x{fb00}-x{fb06}x{fb13}-x{fb17}x{fb1d}x{fb1f}-x{fb28}x{fb2a}-x{fb36}x{fb38}-x{fb3c}x{fb3e}x{fb40}x{fb41}x{fb43}x{fb44}x{fb46}-x{fbb1}x{fbd3}-x{fd3d}x{fd50}-x{fd8f}x{fd92}-x{fdc7}x{fdf0}-x{fdfb}x{fe70}-x{fe74}x{fe76}-x{fefc}x{ff21}-x{ff3a}x{ff41}-x{ff5a}x{ff66}-x{ffbe}x{ffc2}-x{ffc7}x{ffca}-x{ffcf}x{ffd2}-x{ffd7}x{ffda}-x{ffdc}][$A-Z_a-zxaaxb5xbaxc0-xd6xd8-xf6xf8-x{02c1}x{02c6}-x{02d1}x{02e0}-x{02e4}x{02ec}x{02ee}x{0370}-x{0374}x{0376}x{0377}x{037a}-x{037d}x{0386}x{0388}-x{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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 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 --.
* There can't be a newline separating ! and whatever it is negating.
* ++ & -- 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 --.
* ++ & -- 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);
$this->operatorsBefore = file($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)
{
$content = '';
// loop files
foreach ($this->data as $source => $js) {
/*
* Combine js: separating the scripts by a ;
* I'm also adding a newline: it will be eaten when whitespace is
* stripped, but we need to make sure we're not just appending
* a new script right after a previous script that ended with a
* singe-line comment on the last line (in which case it would also
* be seen as part of that comment)
*/
$content .= $js."n;";
}
/*
* 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();
$content = $this->replace($content);
$content = $this->stripWhitespace($content);
$content = $this->propertyNotation($content);
$content = $this->shortenBools($content);
/*
* 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()
{
// single-line comments
$this->registerPattern('///.*$/m', '');
// multi-line comments
$this->registerPattern('//*.*?*//s', '');
}
/**
* 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[1];
return $placeholder;
};
// it's a regex if we can find an opening (not preceded by variable,
// value or similar) & (non-escaped) closing /,
// include n because it may be there for a reason
// (https://github.com/matthiasmullie/minify/issues/56)
$this->registerPattern('/^s*+K(/.*?(?<!\\)(\\\\)*+/n?)/', $callback);
$before = $this->getOperatorsForRegex($this->operatorsBefore, '/') + $this->getKeywordsForRegex($this->keywordsReserved, '/');
$this->registerPattern('/(?:'.implode('|', $before).')s*+K(/.*?(?<!\\)(\\\\)*+/n?)/', $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("rn", "r"), "n", $content);
// collapse all non-line feed whitespace into a single space
$content = preg_replace('/[^Sn]+/', ' ', $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);
// strip whitespace that ends in (or next line begin with) an operator
// that allows statements to be broken up over multiple lines
$before = $this->getOperatorsForRegex($this->operatorsBefore, '/');
$after = $this->getOperatorsForRegex($this->operatorsAfter, '/');
$content = preg_replace('/('.implode('|', $before).')s+/', '\1', $content);
$content = preg_replace('/s+('.implode('|', $after).')/', '\1', $content);
// make sure + and - can't be mistaken for, or joined into ++ and --
$content = preg_replace('/(?<![+-])s*([+-])(?![+-])/', '\1', $content);
$content = preg_replace('/(?<![+-])([+-])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.
*/
$operators = $this->getOperatorsForRegex($this->operatorsBefore + $this->operatorsAfter, '/');
$content = preg_replace('/([})]])[^Sn]+(?!'.implode('|', $operators).')/', '\1', $content);
// collapse whitespace around reserved words into single space
$before = $this->getKeywordsForRegex($this->keywordsBefore, '/');
$after = $this->getKeywordsForRegex($this->keywordsAfter, '/');
$content = preg_replace('/(^|[;}s])K('.implode('|', $before).')s+/', '\2 ', $content);
$content = preg_replace('/s+('.implode('|', $after).')(?=([;{s]|$))/', ' \1', $content);
// get rid of double semicolons, except when followed by closing-),
// where semicolons can be used like: "for(v=1,_=b;;)"
$content = preg_replace('/;+(?!))/', ';', $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++);`
* 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...
* 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);
/*
* 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
$delimiter = array_fill(0, count($operators), $delimiter);
$escaped = array_map('preg_quote', $operators, $delimiter);
$operators = array_combine($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).';
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 un-fixed-length lookbehind
* 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
* un-fixed-length lookbehind assertions, I'm just going to do a lot of
* separate lookbehind assertions, one for each keyword.
*/
$keywords = $this->getKeywordsForRegex($keywords);
$keywords = '(?<!'.implode(')(?<!', $keywords).')';
return preg_replace_callback('/(?<='.$previousChar.'|])'.$keywords.'[((['"])[0-9]+\2)]/u', $callback, $content);
}
/**
* Replaces true & false by !0 and !1.
*
* @param string $content
* @return string
*/
protected function shortenBools($content)
{
$content = preg_replace('/btrueb/', '!0', $content);
$content = preg_replace('/bfalseb/', '!1', $content);
// for(;;) is exactly the same as while(true)
$content = preg_replace('/bwhile(!0){/', 'for(;;){', $content);
// now make sure we didn't turn any do ... while(true) into do ... for(;;)
preg_match_all('/bdob/', $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;
}
}