453 lines
32 KiB
PHP
453 lines
32 KiB
PHP
<?php
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/*--------------------------------------------------------------------------------------------------------| www.vdm.io |------/
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__ __ _ _____ _ _ __ __ _ _ _
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\ \ / / | | | __ \ | | | | | \/ | | | | | | |
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\ \ / /_ _ ___| |_ | | | | _____ _____| | ___ _ __ _ __ ___ ___ _ __ | |_ | \ / | ___| |_| |__ ___ __| |
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\ \/ / _` / __| __| | | | |/ _ \ \ / / _ \ |/ _ \| '_ \| '_ ` _ \ / _ \ '_ \| __| | |\/| |/ _ \ __| '_ \ / _ \ / _` |
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\ / (_| \__ \ |_ | |__| | __/\ V / __/ | (_) | |_) | | | | | | __/ | | | |_ | | | | __/ |_| | | | (_) | (_| |
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\/ \__,_|___/\__| |_____/ \___| \_/ \___|_|\___/| .__/|_| |_| |_|\___|_| |_|\__| |_| |_|\___|\__|_| |_|\___/ \__,_|
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/-------------------------------------------------------------------------------------------------------------------------------/
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@version 2.0.8
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@build 31st January, 2016
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@created 30th April, 2015
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@package Component Builder
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@subpackage js.php
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@author Llewellyn van der Merwe <https://www.vdm.io/joomla-component-builder>
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@my wife Roline van der Merwe <http://www.vdm.io/>
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@copyright Copyright (C) 2015. All Rights Reserved
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@license GNU/GPL Version 2 or later - http://www.gnu.org/licenses/gpl-2.0.html
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Builds Complex Joomla Components
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/-----------------------------------------------------------------------------------------------------------------------------*/
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// No direct access to this file
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defined('_JEXEC') or die('Restricted access');
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require_once JPATH_ADMINISTRATOR.'/components/com_componentbuilder/helpers/minify.php';
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/**
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* JavaScript minifier.
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*
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* Please report bugs on https://github.com/matthiasmullie/minify/issues
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*
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* @author Matthias Mullie <minify@mullie.eu>
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* @author Tijs Verkoyen <minify@verkoyen.eu>
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*
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* @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved.
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* @license MIT License
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*/
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class JS extends Minify
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{
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/**
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* Var-matching regex based on http://stackoverflow.com/a/9337047/802993
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*
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* Note that regular expressions using that bit must have the PCRE_UTF8
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* pattern modifier (/u) set.
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*
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* @var string
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*/
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const REGEX_VARIABLE = 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|
|
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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();
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|
|
|
/**
|
|
* 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
|
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* these keywords.
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*
|
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* 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();
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|
|
|
/**
|
|
* 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();
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|
|
/**
|
|
* 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();
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|
|
|
/**
|
|
* 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 $operatorsAfter = array();
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|
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/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public function __construct()
|
|
{
|
|
call_user_func_array(array('parent', '__construct'), func_get_args());
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|
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$dataDir = JPATH_ADMINISTRATOR.'/components/com_componentbuilder/helpers/';
|
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$options = FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES;
|
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$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 /,
|
|
$before = $this->getOperatorsForRegex($this->operatorsBefore, '/');
|
|
$this->registerPattern('/^\s*+\K\/(.*?(?<!\\\\)(\\\\\\\\)*+)\//', $callback);
|
|
$this->registerPattern('/(?:'.implode('|', $before).')\s*+\K\/(.*?(?<!\\\\)(\\\\\\\\)*+)\//', $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);
|
|
|
|
// 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('/([\}\)\]])[^\S\n]+(?!'.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('/\btrue\b/', '!0', $content);
|
|
$content = preg_replace('/\bfalse\b/', '!1', $content);
|
|
|
|
// for(;;) is exactly the same as while(true)
|
|
$content = preg_replace('/\bwhile\(!0\)/', 'for(;;)', $content);
|
|
|
|
return $content;
|
|
}
|
|
}
|