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382 lines (336 loc) · 28.8 KB
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<?php
namespace MatthiasMullie\Minify;
/**
* Minify\JS class
*
* This source file can be used to minify JavaScript files.
*
* The class is documented in the file itself. If you find any bugs help me out and report them. Reporting can be done by sending an email to minify@mullie.eu.
* If you report a bug, make sure you give me enough information (include your code).
*
* @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
{
/**
* 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 array
*/
public $extracted = array();
/**
* List of JavaScript operators that accept a <variable, value, ...> after
* them. We'll insert semicolons if they're missing at EOL, but 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 array
*/
protected $operatorsBefore = array();
/**
* List of JavaScript operators that accept a <variable, value, ...> before
* them. We'll insert semicolons if they're missing at EOL, but 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 array
*/
protected $operatorsAfter = array();
/**
* List of JavaScript reserved words that accept a <variable, value, ...>
* after them. We'll insert semicolons if they're missing at EOL, but 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/reserved_before.txt
*
* @see https://mathiasbynens.be/notes/reserved-keywords
* @var array
*/
protected $keywordsBefore = array();
/**
* List of JavaScript reserved words that accept a <variable, value, ...>
* before them. We'll insert semicolons if they're missing at EOL, but 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/reserved_after.txt
*
* @see https://mathiasbynens.be/notes/reserved-keywords
* @var array
*/
protected $keywordsAfter = array();
/**
* Regular expression matching valid JS variable names.
*
* Borrowed from Mathias Bynens & adapted for use with PHP.
* @see http://stackoverflow.com/questions/1661197/valid-characters-for-javascript-variable-names/9337047#9337047
*
* @var string
*/
protected $variable = 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public function __construct()
{
call_user_func_array(array('parent', '__construct'), func_get_args());
$this->keywordsBefore = file(__DIR__ . '/../data/js/keywords_before.txt', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
$this->keywordsAfter = file(__DIR__ . '/../data/js/keywords_after.txt', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
$this->operatorsBefore = file(__DIR__ . '/../data/js/operators_before.txt', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
$this->operatorsAfter = file(__DIR__ . '/../data/js/operators_after.txt', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
}
/**
* Minify the data.
* Perform JS optimizations.
*
* @param string[optional] $path Path to write the data to.
* @return string The minified data.
*/
public function minify($path = null)
{
$content = '';
// loop files
foreach ($this->data as $source => $js) {
// combine js
$content .= $js;
}
/*
* 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);
/*
* Earlier, we extracted strings & regular expressions and replaced them
* with placeholder text. This will restore them.
*/
$content = $this->restoreExtractedData($content);
// save to path
if($path !== null) $this->save($content, $path);
return $content;
}
/**
* 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()
*/
protected function extractStrings()
{
// PHP only supports $this inside anonymous functions since 5.4
$minifier = $this;
$callback = function ($match) use ($minifier) {
$placeholder = $match[1] . 'STRING' . count($minifier->extracted) . $match[1];
$minifier->extracted[$placeholder] = $match[1] . $match[2] . $match[1];
return $placeholder;
};
$this->registerPattern('/^([\'"])(.*?)(?<!\\\\)\\1/s', $callback, true);
}
/**
* Strip comments from source code.
*/
protected function stripComments()
{
// single-line comments
$this->registerPattern('/^\/\/.*$[\r\n]*/m', '', true);
// multi-line comments
$this->registerPattern('/^\/\*.*?\*\//s', '', true);
}
/**
* JS kan 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) {
$placeholder = '/REGEX' . count($minifier->extracted) . '/';
$minifier->extracted[$placeholder] = '/' . $match[1] . '/';
return $placeholder;
};
// make sure we ignore slashes that can't be a regex (like when they're
// preceded by anything variable-like, or a closing bracket), or that
// look like a comment
// we don't want to match consecutive \ (as division), like in:
// a = b / c; d = e / f
preg_match_all('/\[(.*?)\]/', $this->variable, $parts);
$last = $parts[1][1];
$this->registerPattern('/^[' . $last . '\}\]\)]\s*\/(?![\/\*])/u', '\\0', true);
// it's a regex if we can find a (non-escaped) closing /
$this->registerPattern('/^\/(.*?(?<!\\\\)(\\\\\\\\)*)\//', $callback, true);
}
/**
* 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)
{
$content = str_replace(array_keys($this->extracted), $this->extracted, $content);
$this->extracted = array();
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);
// strip leading & trailing whitespace
$content = preg_replace('/^\s+/m', '', $content);
$content = preg_replace('/\s+$/m', '', $content);
// collapse all non-line feed whitespace into single space
$content = preg_replace('/[^\S\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);
// collapse whitespace around reserved words into single space
$before = $this->getKeywordsForRegex($this->keywordsBefore, '/');
$after = $this->getKeywordsForRegex($this->keywordsAfter, '/');
$content = preg_replace('/(' . implode('|', $before) . ')\s+/', '\\1 ', $content);
$content = preg_replace('/\s+(' . implode('|', $after) . ')/', ' \\1', $content);
/*
* Get rid of whitespace after a variable/keyword that is not followed
* by another variable/keyword.
*/
$content = preg_replace('/(' . $this->variable . ')[^\S\n]+(?!' . $this->variable . ')/u', '\\1', $content);
/*
* Now get rid of whitespace before a variable/keyword that is not
* preceded by another variable/keyword.
* This one's more complex since PHP doesn't allow non-fixed length
* lookbehind assertions, so we'll first find all variables preceded by
* variables & change that space to a tab; after that, find remaining
* spaces followed by variable (which now are all variables not preceded
* by other vars); then restore the tab to a space.
*/
$content = preg_replace('/(' . $this->variable . ')[^\S\n]+(?=' . $this->variable . ')/u', "\\1\t", $content);
$content = preg_replace('/ (' . $this->variable . ')/u', "\\1", $content);
$content = str_replace("\t", ' ', $content);
// semicolons don't make sense at end of source, where ASI will kick in
$content = trim($content, ';');
/*
* We also don't really want to terminate statements followed by closing
* curly braces (which we've ignored completely up until now): ASI will
* kick in here & we're all about minifying.
*/
$content = preg_replace('/;\}/s', '}', $content);
return $content;
}
/**
* We'll strip whitespace around certain operators with regular expressions.
* This will prepare the given array by escaping all characters.
*
* @param array $operators
* @param string $delimiter
* @return array
*/
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);
// make sure + and - can't be mistaken for ++ and --, which are special
$operators['+'] = '(?<!\+)\+(?!\s*\+)';
$operators['-'] = '(?<!\-)\-(?!\s*\-)';
// dot can not just immediately follow a number; it can be confused
// between 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 array $keywords
* @param string $delimiter
* @return array
*/
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;
}
}