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266 lines (235 loc) · 8.78 KB
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<?php
namespace MatthiasMullie\Minify;
/**
* Abstract minifier class.
*
* Please report bugs on https://github.com/matthiasmullie/minify/issues
*
* @author Matthias Mullie <minify@mullie.eu>
*
* @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved.
* @license MIT License
*/
abstract class Minify
{
/**
* The data to be minified
*
* @var string[]
*/
protected $data = array();
/**
* 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();
/**
* Init the minify class - optionally, code may be passed along already.
*/
public function __construct(/* $data = null, ... */)
{
// it's possible to add the source through the constructor as well ;)
if (func_num_args()) {
call_user_func_array(array($this, 'add'), func_get_args());
}
}
/**
* Add a file or straight-up code to be minified.
*
* @param string $data
*/
public function add($data /* $data = null, ... */)
{
// bogus "usage" of parameter $data: scrutinizer warns this variable is
// not used (we're using func_get_args instead to support overloading),
// but it still needs to be defined because it makes no sense to have
// this function without argument :)
$args = array($data) + func_get_args();
// this method can be overloaded
foreach ($args as $data) {
// redefine var
$data = (string) $data;
// load data
$value = $this->load($data);
$key = ($data != $value) ? $data : count($this->data);
// store data
$this->data[$key] = $value;
}
}
/**
* Load data.
*
* @param string $data Either a path to a file or the content itself.
* @return string
*/
protected function load($data)
{
// check if the data is a file
if (@file_exists($data) && is_file($data)) {
$data = @file_get_contents($data);
// strip BOM, if any
if (substr($data, 0, 3) == "\xef\xbb\xbf") {
$data = substr($data, 3);
}
}
return $data;
}
/**
* Save to file
*
* @param string $content The minified data.
* @param string $path The path to save the minified data to.
* @throws Exception
*/
protected function save($content, $path)
{
// create file & open for writing
if (($handler = @fopen($path, 'w')) === false) {
throw new Exception('The file "' . $path . '" could not be opened. Check if PHP has enough permissions.');
}
// write to file
if (@fwrite($handler, $content) === false) {
throw new Exception('The file "' . $path . '" could not be written to. Check if PHP has enough permissions.');
}
// close the file
@fclose($handler);
}
/**
* Minify the data.
*
* @param string[optional] $path Path to write the data to.
* @return string The minified data.
*/
abstract public function minify($path = null);
/**
* Register a pattern to execute against the source content.
*
* @param string $pattern PCRE pattern.
* @param string|callable $replacement Replacement value for matched pattern.
* @throws Exception
*/
protected function registerPattern($pattern, $replacement = '')
{
// study the pattern, we'll execute it more than once
$pattern .= 'S';
$this->patterns[] = array($pattern, $replacement);
}
/**
* 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)
{
$processed = '';
while ($content) {
// execute all patterns and find the first match
$matches = array();
foreach ($this->patterns as $i => $pattern) {
list($pattern, $replacement) = $pattern;
$match = null;
if (preg_match($pattern, $content, $match)) {
$matches[$i] = $match;
}
}
// no more matches to find: everything's been processed, break out
if (!$matches) {
$processed .= $content;
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)
$positions = array();
foreach ($matches as $i => $match) {
$positions[$i] = strpos($content, $match[0]);
}
$discardLength = min($positions);
$firstPattern = array_search($discardLength, $positions);
$match = $matches[$firstPattern][0];
// execute the pattern that matches earliest in the content string
list($pattern, $replacement) = $this->patterns[$firstPattern];
$replacement = $this->replacePattern($pattern, $replacement, $content);
// figure out which part of the string was unmatched; that's the
// part we'll execute the patterns on again next
$content = substr($content, $discardLength);
$unmatched = (string) substr($content, strpos($content, $match) + strlen($match));
// move the replaced part to $processed and prepare $content to
// again match batch of patterns against
$processed .= substr($replacement, 0, strlen($replacement) - strlen($unmatched));
$content = $unmatched;
}
return $processed;
}
/**
* This is where a pattern is matched against $content and the matches
* are replaced by their respective value.
* This function will be called plenty of times, where $content will always
* move up 1 character.
*
* @param string $pattern Pattern to match.
* @param string|callable $replacement Replacement value.
* @param string $content Content to match pattern against.
* @return string
*/
protected function replacePattern($pattern, $replacement, $content)
{
if (is_callable($replacement)) {
return preg_replace_callback($pattern, $replacement, $content, 1, $count);
} else {
return preg_replace($pattern, $replacement, $content, 1, $count);
}
}
/**
* 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) {
$count = count($minifier->extracted);
$placeholder = $match[1] . 'STRING' . $count . $match[1];
$minifier->extracted[$placeholder] = $match[1] . $match[2] . $match[1];
return $placeholder;
};
$this->registerPattern('/([\'"])(.*?)(?<!\\\\)\\1/s', $callback);
}
/**
* 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;
}
}