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<?php /** * jsmin.cls.php - modified PHP implementation of Matthias Mullie's JavaScript minifier */ /** * JavaScript Minifier Class * * @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 */ namespace LiteSpeed\Lib ; defined( 'WPINC' ) || exit ; class JSMin { /** * 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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/** * Array of patterns to match. * * @var string[] */ protected $patterns = array(); /** * This array will hold content of strings and regular expressions that have * been extracted from the JS source code, so we can reliably match "code", * without having to worry about potential "code-like" characters inside. * * @var string[] */ public $extracted = array(); /** * 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() { $dataDir = __DIR__.'/jsmin_data/'; $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] $path Path to write the data to * * @return string The minified data */ public static function minify($js) { $jsmin = new JSMin(); return $jsmin->min($js); } public function min($js) { $output = ''; /* * 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(); // 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 ; $output .= $js.";"; // clean up leftover `;`s from the combination of multiple scripts $output = ltrim($output, ';'); $output = (string) substr($output, 0, -1); /* * Earlier, we extracted strings & regular expressions and replaced them * with placeholder text. This will restore them. */ $output = $this->restoreExtractedData($output); return $output; } /** * Strings are a pattern we need to match, in order to ignore potential * code-like content inside them, but we just want all of the string * content to remain untouched. * * This method will replace all string content with simple STRING# * placeholder text, so we've rid all strings from characters that may be * misinterpreted. Original string content will be saved in $this->extracted * and after doing all other minifying, we can restore the original content * via restoreStrings(). * * @param string[optional] $chars * @param string[optional] $placeholderPrefix */ protected function extractStrings($chars = '\'"', $placeholderPrefix = '') { // PHP only supports $this inside anonymous functions since 5.4 $minifier = $this; $callback = function ($match) use ($minifier, $placeholderPrefix) { // check the second index here, because the first always contains a quote if ($match[2] === '') { /* * Empty strings need no placeholder; they can't be confused for * anything else anyway. * But we still needed to match them, for the extraction routine * to skip over this particular string. */ return $match[0]; } $count = count($minifier->extracted); $placeholder = $match[1].$placeholderPrefix.$count.$match[1]; $minifier->extracted[$placeholder] = $match[1].$match[2].$match[1]; return $placeholder; }; /* * The \\ messiness explained: * * Don't count ' or " as end-of-string if it's escaped (has backslash * in front of it) * * Unless... that backslash itself is escaped (another leading slash), * in which case it's no longer escaping the ' or " * * So there can be either no backslash, or an even number * * multiply all of that times 4, to account for the escaping that has * to be done to pass the backslash into the PHP string without it being * considered as escape-char (times 2) and to get it in the regex, * escaped (times 2) */ $this->registerPattern('/(['.$chars.'])(.*?(?<!\\\\)(\\\\\\\\)*+)\\1/s', $callback); } /** * Strip comments from source code. */ protected function stripComments() { // PHP only supports $this inside anonymous functions since 5.4 $minifier = $this; $callback = function ($match) use ($minifier) { if ( substr($match[1], 0, 1) === '!' || strpos($match[1], '@license') !== false || strpos($match[1], '@preserve') !== false ) { // preserve multi-line comments that start with /*! // or contain @license or @preserve annotations $count = count($minifier->extracted); $placeholder = '/*'.$count.'*/'; $minifier->extracted[$placeholder] = $match[0]; return $placeholder; } return ''; }; // multi-line comments $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*'; $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); } /** * We can't "just" run some regular expressions against JavaScript: it's a * complex language. E.g. having an occurrence of // xyz would be a comment, * unless it's used within a string. Of you could have something that looks * like a 'string', but inside a comment. * The only way to accurately replace these pieces is to traverse the JS one * character at a time and try to find whatever starts first. * * @param string $content The content to replace patterns in * * @return string The (manipulated) content */ protected function replace($content) { $contentLength = strlen($content); $output = ''; $processedOffset = 0; $positions = array_fill(0, count($this->patterns), -1); $matches = array(); while ($processedOffset < $contentLength) { // find first match for all patterns foreach ($this->patterns as $i => $pattern) { list($pattern, $replacement) = $pattern; // we can safely ignore patterns for positions we've unset earlier, // because we know these won't show up anymore if (array_key_exists($i, $positions) == false) { continue; } // no need to re-run matches that are still in the part of the // content that hasn't been processed if ($positions[$i] >= $processedOffset) { continue; } $match = null; if (preg_match($pattern, $content, $match, PREG_OFFSET_CAPTURE, $processedOffset)) { $matches[$i] = $match; // we'll store the match position as well; that way, we // don't have to redo all preg_matches after changing only // the first (we'll still know where those others are) $positions[$i] = $match[0][1]; } else { // if the pattern couldn't be matched, there's no point in // executing it again in later runs on this same content; // ignore this one until we reach end of content unset($matches[$i], $positions[$i]); } } // no more matches to find: everything's been processed, break out if (!$matches) { // output the remaining content $output .= substr($content, $processedOffset); break; } // see which of the patterns actually found the first thing (we'll // only want to execute that one, since we're unsure if what the // other found was not inside what the first found) $matchOffset = min($positions); $firstPattern = array_search($matchOffset, $positions); $match = $matches[$firstPattern]; // execute the pattern that matches earliest in the content string list(, $replacement) = $this->patterns[$firstPattern]; // add the part of the input between $processedOffset and the first match; // that content wasn't matched by anything $output .= substr($content, $processedOffset, $matchOffset - $processedOffset); // add the replacement for the match $output .= $this->executeReplacement($replacement, $match); // advance $processedOffset past the match $processedOffset = $matchOffset + strlen($match[0][0]); } return $output; } /** * 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; } /** * 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); } /** * This method will restore all extracted data (strings, regexes) that were * replaced with placeholder text in extract*(). The original content was * saved in $this->extracted. * * @param string $content * * @return string */ protected function restoreExtractedData($content) { if (!$this->extracted) { // nothing was extracted, nothing to restore return $content; } $content = strtr($content, $this->extracted); $this->extracted = array(); return $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; } /** * If $replacement is a callback, execute it, passing in the match data. * If it's a string, just pass it through. * * @param string|callable $replacement Replacement value * @param array $match Match data, in PREG_OFFSET_CAPTURE form * * @return string */ protected function executeReplacement($replacement, $match) { if (!is_callable($replacement)) { return $replacement; } // convert $match from the PREG_OFFSET_CAPTURE form to the form the callback expects foreach ($match as &$matchItem) { $matchItem = $matchItem[0]; } return $replacement($match); } /** * Register a pattern to execute against the source content. * * If $replacement is a string, it must be plain text. Placeholders like $1 or \2 don't work. * If you need that functionality, use a callback instead. * * @param string $pattern PCRE pattern * @param string|callable $replacement Replacement value for matched pattern */ protected function registerPattern($pattern, $replacement = '') { // study the pattern, we'll execute it more than once $pattern .= 'S'; $this->patterns[] = array($pattern, $replacement); } }