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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);
}
}