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308 lines (270 loc) · 10.3 KB
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<?php
namespace MatthiasMullie\Minify;
/**
* Minify abstract class
*
* This source file can be used to write minifiers for multiple file types.
*
* 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>
*
* @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved.
* @license MIT License
*/
abstract class Minify
{
/**
* The data to be minified
*
* @var array
*/
protected $data = array();
/**
* Array of patterns to match.
*
* @var array
*/
protected $patterns = array();
/**
* Quite a useless variable, for dev-purpose only.
* Can be helpful when running the test suite, to single out a specific
* test to debug.
*
* @var bool
*/
protected $debug = false;
/**
* Init the minify class - optionally, code may be passed along already.
*
* @param string[optional] $css
*/
public function __construct()
{
// it's possible to add the css through the constructor as well ;)
$arguments = func_get_args();
if(func_num_args()) call_user_func_array(array($this, 'add'), $arguments);
}
/**
* Add a file or straight-up code to be minified.
*
* @param string $data
*/
public function add($data)
{
// this method can be overloaded
foreach (func_get_args() as $data) {
// redefine var
$data = (string) $data;
// load data
$value = $this->load($data);
$key = ($data != $value) ? $data : 0;
// initialize key
if(!array_key_exists($key, $this->data)) $this->data[$key] = '';
// 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)) {
// grab content
return @file_get_contents($data);
}
// no file, just return the data itself
else 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);
}
/**
* Sets the debug state.
* Can be helpful when running the test suite, to single out a specific test
* to debug.
*
* @param bool $debug
*/
public function debug($debug)
{
$this->debug = (bool) $debug;
}
/**
* Prints a var_dump of all vars tossed in, then exits.
* Only when $this->debug is set to true.
*
* @param mixed $vars Can be overloaded with multiple vars
*/
protected function dump($vars /* [, $var2 [, ...]] */)
{
if(!$this->debug) return;
var_dump(func_get_args());
exit;
}
/**
* 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.
* Patterns should always include caret (= start from the beginning of the
* string) - processing will be performed by traversing the content
* character by character, so we need the pattern to start matching
* exactly at the first character of the content at that point.
*
* @param string $pattern PCRE pattern.
* @param string|callable $replacement Replacement value for matched pattern.
* @param bool $skip Identifies if this match should be skipped by the rest of the patterns, once matched.
* @throws Exception
*/
protected function registerPattern($pattern, $replacement = '', $skip = false)
{
// doublecheck if pattern actually starts at beginning of content
if (substr($pattern, 1, 1) !== '^') {
throw new Exception('Pattern "' . $pattern . '" should start processing at the beginning of the string.');
}
$this->patterns[] = array($pattern, $replacement, $skip);
}
/**
* 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)
{
// every character that has been processed will be moved to this string
$processed = '';
// update will keep shrinking, character by character, until all of it
// has been processed
while ($content) {
$ignore = -1;
for ($i = 0; $i < count($this->patterns); $i++) {
// pattern to ignore (if it was previously matched)
if($i === $ignore) continue;
list($pattern, $replacement, $skip) = $this->patterns[$i];
// replace pattern occurrences starting at this character
list($content, $replacement, $match) = $this->replacePattern($pattern, $content, $replacement);
// pattern matched & content replaced; save replacement value
if ($match != '' || $replacement != '') {
// some patterns will want to make sure that the replaced
// content is not touched by any other patterns (like
// strings are comments)
if ($skip) {
$processed .= $replacement;
$content = (string) substr($content, strlen($replacement));
continue 2;
}
// since there's been a change in the content, let's re-run
// all patterns at the start of the new content, but make
// sure the same pattern is ignored time
$ignore = $i;
$i = -1;
}
}
// add this character to $processed & strip it from $content, moving
// on to the next character
$processed .= $content[0];
$content = substr($content, 1);
}
// clear registered patterns
$this->patterns = array();
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 $content Content to match pattern against.
* @param string|callable $replacement Replacement value.
* @return array [content, replacement, match]
*/
protected function replacePattern($pattern, $content, $replacement)
{
if (is_callable($replacement)) {
return $this->replaceWithCallback($pattern, $content, $replacement);
} else {
return $this->replaceWithString($pattern, $content, $replacement);
}
}
/**
* Replaces pattern by a value from a callback, via preg_replace_callback.
*
* @param string $pattern Pattern to match.
* @param string $content Content to match pattern against.
* @param string|callable $replacement Replacement value.
* @return array [content, replacement, match]
*/
protected function replaceWithCallback($pattern, $content, $replacement)
{
$matched = '';
$replaced = '';
/*
* Instead of just passing the $replacement callback, we'll wrap another
* callback around it to also allow us to catch the match & replacement
* value.
*/
$callback = function ($match) use ($replacement, &$replaced, &$matched) {
$matched = $match;
$replaced = call_user_func($replacement, $match);
return $replaced;
};
$content = preg_replace_callback($pattern, $callback, $content, 1, $count);
return array($content, $replaced, $matched);
}
/**
* Replaces pattern by a value from a callback, via preg_replace.
*
* @param string $pattern Pattern to match.
* @param string $content Content to match pattern against.
* @param string|callable $replacement Replacement value.
* @return array [content, replacement, match]
*/
protected function replaceWithString($pattern, $content, $replacement)
{
/*
* This preg_match is really only meant to capture $match, which we can
* then also use to deduce the replacement value. We can't just assume
* $replacement as replacement value, because it may be a back-reference
* (e.g. \\1)
*/
if (!preg_match($pattern, $content, $match)) {
return array($content, '', '');
}
$untouched = strlen($content) - strlen($match[0]);
$content = preg_replace($pattern, $replacement, $content, 1, $count);
$replaced = (string) substr($content, 0, strlen($content) - $untouched);
return array($content, $replaced, $match[0]);
}
}