1 files changed, 121 insertions, 0 deletions
diff --git a/bootstrap/comments/backend/classes/javascriptminifier.php b/bootstrap/comments/backend/classes/javascriptminifier.php
new file mode 100644
index 0000000..35a57a6
--- /dev/null
+++ b/bootstrap/comments/backend/classes/javascriptminifier.php
@@ -0,0 +1,121 @@
+<?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);
+	}
+}