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<?php namespace HashOver;
// Copyright (C) 2015 Jacob Barkdull
// This file is part of HashOver.
//
// HashOver is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// HashOver is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with HashOver. If not, see <http://www.gnu.org/licenses/>.
class JavaScriptMinifier
{
// Array for locking minification
protected $lock = array (
'status' => false,
'char' => ''
);
// JavaScript minification function
public function minify ($js, $level = 4)
{
if ($level <= 0) {
return $js;
}
if ($level >= 1) {
// Remove single-line code comments
$js = preg_replace ('/^[\t ]*?\/\/.*\s?/m', '', $js);
// Remove end-of-line code comments
$js = preg_replace ('/([\s;})]+)\/\/.*/m', '\\1', $js);
// Remove multi-line code comments
$js = preg_replace ('/\/\*[\s\S]*?\*\//', '', $js);
}
if ($level >= 2) {
// Remove whitespace
$js = preg_replace ('/^\s*/m', '', $js);
// Replace multiple tabs with a single space
$js = preg_replace ('/\t+/m', ' ', $js);
}
if ($level >= 3) {
// Remove newlines
$js = preg_replace ('/[\r\n]+/', '', $js);
}
if ($level >= 4) {
// Split input JavaScript by single and double quotes
$js_substrings = preg_split ('/([\'"])/', $js, -1, PREG_SPLIT_DELIM_CAPTURE);
// Empty variable for minified JavaScript
$js = '';
foreach ($js_substrings as $substring) {
// Check if substring is split delimiter
if ($substring === '\'' or $substring === '"') {
// If so, check whether minification is unlocked
if ($this->lock['status'] === false) {
// If so, lock it and set lock character
$this->lock['status'] = true;
$this->lock['char'] = $substring;
} else {
// If not, check if substring is lock character
if ($substring === $this->lock['char']) {
// If so, unlock minification
$this->lock['status'] = false;
$this->lock['char'] = '';
}
}
// Add substring to minified output
$js .= $substring;
continue;
}
// Minify current substring if minification is unlocked
if ($this->lock['status'] === false) {
// Remove unnecessary semicolons
$substring = str_replace (';}', '}', $substring);
// Remove spaces round operators
$substring = preg_replace ('/ *([<>=+\-!\|{(},;&:?]+) */', '\\1', $substring);
}
// Add substring to minified output
$js .= $substring;
}
}
// Get URL add "unminified" URL query
$unminified_url = 'http' . (isset ($_SERVER['HTTPS']) ? 's' : '') . '://';
$unminified_url .= $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
$unminified_url .= '&hashover-unminified';
// Copyright notice and URL to unminified code
$copyright = array (
'// Copyright (C) 2015 Jacob Barkdull',
'// Under the terms of the GNU Affero General Public License.',
'//',
'// Non-minified JavaScript:',
'//',
'// ' . $unminified_url . PHP_EOL . PHP_EOL
);
// Return final minified JavaScript
return implode (PHP_EOL, $copyright) . trim ($js);
}
}
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