Adding upstream version 0.12.1+ds.upstream/0.12.1+dsupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

5 files changed, 906 insertions, 0 deletions

diff --git a/vendor/tedivm/jshrink/CONTRIBUTING.md b/vendor/tedivm/jshrink/CONTRIBUTING.md
new file mode 100644
index 0000000..8fe815a
--- /dev/null
+++ b/vendor/tedivm/jshrink/CONTRIBUTING.md
@@ -0,0 +1,54 @@
+# Contributions Welcome!
+
+Pull Requests and Community Contributions are the bread and butter of open source software. Every contribution- from bug
+reports to feature requests, typos to full new features- are greatly appreciated.
+
+
+## Important Guidelines
+
+* One Item Per Pull Request or Issue. This makes it much easier to review code and merge it back in, and prevents issues
+  with one request from blocking another.
+
+* Code Coverage is extremely important, and pull requests are much more likely to be accepted if testing is also improved.
+  New code should be properly tested, and all tests must pass.
+
+* Read the LICENSE document and make sure you understand it, because your code is going to be released under it.
+
+* Be prepared to make revisions. Don't be discouraged if you're asked to make changes, as that is just another step
+  towards refining the code and getting it merged back in.
+
+* Remember to add the relevant documentation, particular the docblock comments.
+
+
+## Code Styling
+
+This project follows the PSR standards set forth by the [PHP Framework Interop Group](http://www.php-fig.org/).
+
+* [PSR-0: Class and file naming conventions](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-0.md)
+* [PSR-1: Basic coding standard](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-1-basic-coding-standard.md)
+* [PSR-2: Coding style guide](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-2-coding-style-guide.md)
+
+All code most follow these standards to be accepted. The easiest way to accomplish this is to run php-cs-fixer once the
+new changes are finished. The php-cs-fixer package is installed as a development dependency of this project.
+
+    composer install --dev
+    vendor/bin/php-cs-fixer fix ./ --level="all" -vv
+
+
+## Running the test suite
+
+First install dependencies using Composer. It's important to include the dev packages:
+
+    composer install --dev
+
+The "runTests.sh" script runs the full test suite- phpunit, php-cs-fixer, as well as any environmental setup:
+
+    tests/runTests.sh
+
+To call phpunit directly:
+
+    vendor/bin/phpunit
+
+To call php-cs-fixer directly:
+
+    vendor/bin/php-cs-fixer fix ./ --level="all" -vv --dry-run
diff --git a/vendor/tedivm/jshrink/LICENSE b/vendor/tedivm/jshrink/LICENSE
new file mode 100644
index 0000000..c6597d8
--- /dev/null
+++ b/vendor/tedivm/jshrink/LICENSE
@@ -0,0 +1,29 @@
+BSD 3-Clause License
+
+Copyright (c) 2009, Robert Hafner
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+   contributors may be used to endorse or promote products derived from
+   this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/vendor/tedivm/jshrink/README.md b/vendor/tedivm/jshrink/README.md
new file mode 100644
index 0000000..11c84cb
--- /dev/null
+++ b/vendor/tedivm/jshrink/README.md
@@ -0,0 +1,72 @@
+# JShrink [![Build Status](https://img.shields.io/github/actions/workflow/status/tedious/jshrink/pr_tests.yml?branch=master)](https://github.com/tedious/JShrink/actions/workflows/pr_tests.yml)
+
+[![License](http://img.shields.io/packagist/l/tedivm/JShrink.svg)](https://github.com/tedivm/JShrink/blob/master/LICENSE)
+[![Latest Stable Version](http://img.shields.io/github/release/tedious/JShrink.svg)](https://packagist.org/packages/tedivm/JShrink)
+[![Coverage Status](https://coveralls.io/repos/tedious/JShrink/badge.png?branch=master)](https://coveralls.io/r/tedivm/JShrink?branch=master)
+[![Total Downloads](http://img.shields.io/packagist/dt/tedivm/jshrink.svg)](https://packagist.org/packages/tedivm/JShrink)
+
+JShrink is a php class that minifies javascript so that it can be delivered to the client quicker. This code can be used
+by any product looking to minify their javascript on the fly (although caching the results is suggested for performance
+reasons). Unlike many other products this is not a port into php but a native application, resulting in better
+performance.
+
+
+## Usage
+
+Minifying your code is simple call to a static function-
+
+```php
+<?php
+include('vendor/autoload.php');
+
+// Basic (default) usage.
+$minifiedCode = \JShrink\Minifier::minify($js);
+
+// Disable YUI style comment preservation.
+$minifiedCode = \JShrink\Minifier::minify($js, array('flaggedComments' => false));
+```
+
+
+## Results
+
+* Raw - 586,990
+* Gzip - 151,301
+* JShrink - 371,982
+* JShrink and Gzip - 93,507
+
+
+## Installing
+
+### Composer
+
+Installing JShrink can be done through a variety of methods, although Composer is
+recommended.
+
+```yaml
+"require": {
+  "tedivm/jshrink": "~1.0"
+}
+```
+
+### Github
+
+Releases of JShrink are available on [Github](https://github.com/tedious/JShrink/releases).
+
+
+## License
+
+JShrink is licensed under the BSD License. See the LICENSE file for details.
+
+In the spirit of open source, use of this library for evil is discouraged but not prohibited.
+
+
+## Reporting Security and Vulnerability Issues
+
+This project utilizes the [Tidelift Security Reporting System](https://tidelift.com/security) for security and vulnerability reporting.
+
+
+## Support
+
+Issues can be opened directly in Github for issues that aren't related to security.
+
+[Professionally supported JShrink is now available with Tidelift.](https://tidelift.com/subscription/pkg/packagist-tedivm-jshrink?utm_source=packagist-tedivm-jshrink&utm_medium=referral&utm_campaign=readme)
diff --git a/vendor/tedivm/jshrink/composer.json b/vendor/tedivm/jshrink/composer.json
new file mode 100644
index 0000000..6b77e1b
--- /dev/null
+++ b/vendor/tedivm/jshrink/composer.json
@@ -0,0 +1,30 @@
+{
+  "name": "tedivm/jshrink",
+  "description": "Javascript Minifier built in PHP",
+  "keywords": [
+    "minifier",
+    "javascript"
+  ],
+  "homepage": "http://github.com/tedious/JShrink",
+  "type": "library",
+  "license": "BSD-3-Clause",
+  "authors": [
+    {
+      "name": "Robert Hafner",
+      "email": "tedivm@tedivm.com"
+    }
+  ],
+  "require": {
+    "php": "^7.0|^8.0"
+  },
+  "require-dev": {
+    "phpunit/phpunit": "^9|^10",
+    "friendsofphp/php-cs-fixer": "^3.14",
+    "php-coveralls/php-coveralls": "^2.5.0"
+  },
+  "autoload": {
+    "psr-0": {
+      "JShrink": "src/"
+    }
+  }
+}
diff --git a/vendor/tedivm/jshrink/src/JShrink/Minifier.php b/vendor/tedivm/jshrink/src/JShrink/Minifier.php
new file mode 100644
index 0000000..f0a078d
--- /dev/null
+++ b/vendor/tedivm/jshrink/src/JShrink/Minifier.php
@@ -0,0 +1,721 @@
+<?php
+/*
+ * This file is part of the JShrink package.
+ *
+ * (c) Robert Hafner <tedivm@tedivm.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * JShrink
+ *
+ *
+ * @package    JShrink
+ * @author     Robert Hafner <tedivm@tedivm.com>
+ */
+
+namespace JShrink;
+
+/**
+ * Minifier
+ *
+ * Usage - Minifier::minify($js);
+ * Usage - Minifier::minify($js, $options);
+ * Usage - Minifier::minify($js, array('flaggedComments' => false));
+ *
+ * @package JShrink
+ * @author Robert Hafner <tedivm@tedivm.com>
+ * @license http://www.opensource.org/licenses/bsd-license.php  BSD License
+ */
+class Minifier
+{
+    /**
+     * The input javascript to be minified.
+     *
+     * @var string
+     */
+    protected $input;
+
+    /**
+     * Length of input javascript.
+     *
+     * @var int
+     */
+    protected $len = 0;
+
+    /**
+     * The location of the character (in the input string) that is next to be
+     * processed.
+     *
+     * @var int
+     */
+    protected $index = 0;
+
+    /**
+     * The first of the characters currently being looked at.
+     *
+     * @var string
+     */
+    protected $a = '';
+
+    /**
+     * The next character being looked at (after a);
+     *
+     * @var string
+     */
+    protected $b = '';
+
+    /**
+     * This character is only active when certain look ahead actions take place.
+     *
+     *  @var string
+     */
+    protected $c;
+
+    /**
+     * This character is only active when certain look ahead actions take place.
+     *
+     *  @var string
+     */
+    protected $last_char;
+
+    /**
+     * This character is only active when certain look ahead actions take place.
+     *
+     *  @var string
+     */
+    protected $output;
+
+    /**
+     * Contains the options for the current minification process.
+     *
+     * @var array
+     */
+    protected $options;
+
+    /**
+     * These characters are used to define strings.
+     */
+    protected $stringDelimiters = ['\'' => true, '"' => true, '`' => true];
+
+    /**
+     * Contains the default options for minification. This array is merged with
+     * the one passed in by the user to create the request specific set of
+     * options (stored in the $options attribute).
+     *
+     * @var array
+     */
+    protected static $defaultOptions = ['flaggedComments' => true];
+
+
+    protected static $keywords = ["delete", "do", "for", "in", "instanceof", "return", "typeof", "yield"];
+
+    protected $max_keyword_len;
+
+    /**
+     * Contains lock ids which are used to replace certain code patterns and
+     * prevent them from being minified
+     *
+     * @var array
+     */
+    protected $locks = [];
+
+    /**
+     * Takes a string containing javascript and removes unneeded characters in
+     * order to shrink the code without altering it's functionality.
+     *
+     * @param  string      $js      The raw javascript to be minified
+     * @param  array       $options Various runtime options in an associative array
+     * @throws \Exception
+     * @return bool|string
+     */
+    public static function minify($js, $options = [])
+    {
+        try {
+            $jshrink = new Minifier();
+            $js = $jshrink->lock($js);
+            $js = ltrim($jshrink->minifyToString($js, $options));
+            $js = $jshrink->unlock($js);
+            unset($jshrink);
+            return $js;
+        } catch (\Exception $e) {
+            if (isset($jshrink)) {
+                // Since the breakdownScript function probably wasn't finished
+                // we clean it out before discarding it.
+                $jshrink->clean();
+                unset($jshrink);
+            }
+            throw $e;
+        }
+    }
+
+    /**
+     * Processes a javascript string and outputs only the required characters,
+     * stripping out all unneeded characters.
+     *
+     * @param string $js      The raw javascript to be minified
+     * @param array  $options Various runtime options in an associative array
+     */
+    protected function minifyToString($js, $options)
+    {
+        $this->initialize($js, $options);
+        $this->loop();
+        $this->clean();
+        return $this->output;
+    }
+
+    /**
+     *  Initializes internal variables, normalizes new lines,
+     *
+     * @param string $js      The raw javascript to be minified
+     * @param array  $options Various runtime options in an associative array
+     */
+    protected function initialize($js, $options)
+    {
+        $this->options = array_merge(static::$defaultOptions, $options);
+        $this->input = $js;
+
+        // We add a newline to the end of the script to make it easier to deal
+        // with comments at the bottom of the script- this prevents the unclosed
+        // comment error that can otherwise occur.
+        $this->input .= PHP_EOL;
+
+        // save input length to skip calculation every time
+        $this->len = strlen($this->input);
+
+        // Populate "a" with a new line, "b" with the first character, before
+        // entering the loop
+        $this->a = "\n";
+        $this->b = "\n";
+        $this->last_char = "\n";
+        $this->output = "";
+
+        $this->max_keyword_len = max(array_map('strlen', static::$keywords));
+    }
+
+    /**
+     * Characters that can't stand alone preserve the newline.
+     *
+     * @var array
+     */
+    protected $noNewLineCharacters = [
+        '(' => true,
+        '-' => true,
+        '+' => true,
+        '[' => true,
+        '#' => true,
+        '@' => true];
+
+
+    protected function echo($char) {
+        $this->output .= $char;
+        $this->last_char = $char[-1];
+    }
+
+
+    /**
+     * The primary action occurs here. This function loops through the input string,
+     * outputting anything that's relevant and discarding anything that is not.
+     */
+    protected function loop()
+    {
+        while ($this->a !== false && !is_null($this->a) && $this->a !== '') {
+            switch ($this->a) {
+                // new lines
+                case "\r":
+                case "\n":
+                    // if the next line is something that can't stand alone preserve the newline
+                    if ($this->b !== false && isset($this->noNewLineCharacters[$this->b])) {
+                        $this->echo($this->a);
+                        $this->saveString();
+                        break;
+                    }
+
+                    // if B is a space we skip the rest of the switch block and go down to the
+                    // string/regex check below, resetting $this->b with getReal
+                    if ($this->b === ' ') {
+                        break;
+                    }
+
+                // otherwise we treat the newline like a space
+
+                // no break
+                case ' ':
+                    if (static::isAlphaNumeric($this->b)) {
+                        $this->echo($this->a);
+                    }
+
+                    $this->saveString();
+                    break;
+
+                default:
+                    switch ($this->b) {
+                        case "\r":
+                        case "\n":
+                            if (strpos('}])+-"\'', $this->a) !== false) {
+                                $this->echo($this->a);
+                                $this->saveString();
+                                break;
+                            } else {
+                                if (static::isAlphaNumeric($this->a)) {
+                                    $this->echo($this->a);
+                                    $this->saveString();
+                                }
+                            }
+                            break;
+
+                        case ' ':
+                            if (!static::isAlphaNumeric($this->a)) {
+                                break;
+                            }
+
+                        // no break
+                        default:
+                            // check for some regex that breaks stuff
+                            if ($this->a === '/' && ($this->b === '\'' || $this->b === '"')) {
+                                $this->saveRegex();
+                                continue 3;
+                            }
+
+                            $this->echo($this->a);
+                            $this->saveString();
+                            break;
+                    }
+            }
+
+            // do reg check of doom
+            $this->b = $this->getReal();
+
+            if ($this->b == '/') {
+                $valid_tokens = "(,=:[!&|?\n";
+
+                # Find last "real" token, excluding spaces.
+                $last_token = $this->a;
+                if ($last_token == " ") {
+                    $last_token = $this->last_char;
+                }
+
+                if (strpos($valid_tokens, $last_token) !== false) {
+                    // Regex can appear unquoted after these symbols
+                    $this->saveRegex();
+                } else if ($this->endsInKeyword()) {
+                    // This block checks for the "return" token before the slash.
+                    $this->saveRegex();
+                }
+            }
+
+            // if (($this->b == '/' && strpos('(,=:[!&|?', $this->a) !== false)) {
+            //     $this->saveRegex();
+            // }
+        }
+    }
+
+    /**
+     * Resets attributes that do not need to be stored between requests so that
+     * the next request is ready to go. Another reason for this is to make sure
+     * the variables are cleared and are not taking up memory.
+     */
+    protected function clean()
+    {
+        unset($this->input);
+        $this->len = 0;
+        $this->index = 0;
+        $this->a = $this->b = '';
+        unset($this->c);
+        unset($this->options);
+    }
+
+    /**
+     * Returns the next string for processing based off of the current index.
+     *
+     * @return string
+     */
+    protected function getChar()
+    {
+        // Check to see if we had anything in the look ahead buffer and use that.
+        if (isset($this->c)) {
+            $char = $this->c;
+            unset($this->c);
+        } else {
+            // Otherwise we start pulling from the input.
+            $char = $this->index < $this->len ? $this->input[$this->index] : false;
+
+            // If the next character doesn't exist return false.
+            if (isset($char) && $char === false) {
+                return false;
+            }
+
+            // Otherwise increment the pointer and use this char.
+            $this->index++;
+        }
+
+        # Convert all line endings to unix standard.
+        # `\r\n` converts to `\n\n` and is minified.
+        if ($char == "\r") {
+            $char = "\n";
+        }
+
+        // Normalize all whitespace except for the newline character into a
+        // standard space.
+        if ($char !== "\n" && $char < "\x20") {
+            return ' ';
+        }
+
+        return $char;
+    }
+
+    /**
+     * This function returns the next character without moving the index forward.
+     *
+     *
+     * @return string            The next character
+     * @throws \RuntimeException
+     */
+    protected function peek()
+    {
+        if ($this->index >= $this->len) {
+            return false;
+        }
+
+        $char = $this->input[$this->index];
+        # Convert all line endings to unix standard.
+        # `\r\n` converts to `\n\n` and is minified.
+        if ($char == "\r") {
+            $char = "\n";
+        }
+
+        // Normalize all whitespace except for the newline character into a
+        // standard space.
+        if ($char !== "\n" && $char < "\x20") {
+            return ' ';
+        }
+
+        # Return the next character but don't push the index.
+        return $char;
+    }
+
+    /**
+     * This function gets the next "real" character. It is essentially a wrapper
+     * around the getChar function that skips comments. This has significant
+     * performance benefits as the skipping is done using native functions (ie,
+     * c code) rather than in script php.
+     *
+     *
+     * @return string            Next 'real' character to be processed.
+     * @throws \RuntimeException
+     */
+    protected function getReal()
+    {
+        $startIndex = $this->index;
+        $char = $this->getChar();
+
+        // Check to see if we're potentially in a comment
+        if ($char !== '/') {
+            return $char;
+        }
+
+        $this->c = $this->getChar();
+
+        if ($this->c === '/') {
+            $this->processOneLineComments($startIndex);
+
+            return $this->getReal();
+        } elseif ($this->c === '*') {
+            $this->processMultiLineComments($startIndex);
+
+            return $this->getReal();
+        }
+
+        return $char;
+    }
+
+    /**
+     * Removed one line comments, with the exception of some very specific types of
+     * conditional comments.
+     *
+     * @param  int  $startIndex The index point where "getReal" function started
+     * @return void
+     */
+    protected function processOneLineComments($startIndex)
+    {
+        $thirdCommentString = $this->index < $this->len ? $this->input[$this->index] : false;
+
+        // kill rest of line
+        $this->getNext("\n");
+
+        unset($this->c);
+
+        if ($thirdCommentString == '@') {
+            $endPoint = $this->index - $startIndex;
+            $this->c = "\n" . substr($this->input, $startIndex, $endPoint);
+        }
+    }
+
+    /**
+     * Skips multiline comments where appropriate, and includes them where needed.
+     * Conditional comments and "license" style blocks are preserved.
+     *
+     * @param  int               $startIndex The index point where "getReal" function started
+     * @return void
+     * @throws \RuntimeException Unclosed comments will throw an error
+     */
+    protected function processMultiLineComments($startIndex)
+    {
+        $this->getChar(); // current C
+        $thirdCommentString = $this->getChar();
+
+        // Detect a completely empty comment, ie `/**/`
+        if ($thirdCommentString == "*") {
+            $peekChar = $this->peek();
+            if ($peekChar == "/") {
+                $this->index++;
+                return;
+            }
+        }
+
+        // kill everything up to the next */ if it's there
+        if ($this->getNext('*/')) {
+            $this->getChar(); // get *
+            $this->getChar(); // get /
+            $char = $this->getChar(); // get next real character
+
+            // Now we reinsert conditional comments and YUI-style licensing comments
+            if (($this->options['flaggedComments'] && $thirdCommentString === '!')
+                || ($thirdCommentString === '@')) {
+
+                // If conditional comments or flagged comments are not the first thing in the script
+                // we need to echo a and fill it with a space before moving on.
+                if ($startIndex > 0) {
+                    $this->echo($this->a);
+                    $this->a = " ";
+
+                    // If the comment started on a new line we let it stay on the new line
+                    if ($this->input[($startIndex - 1)] === "\n") {
+                        $this->echo("\n");
+                    }
+                }
+
+                $endPoint = ($this->index - 1) - $startIndex;
+                $this->echo(substr($this->input, $startIndex, $endPoint));
+
+                $this->c = $char;
+
+                return;
+            }
+        } else {
+            $char = false;
+        }
+
+        if ($char === false) {
+            throw new \RuntimeException('Unclosed multiline comment at position: ' . ($this->index - 2));
+        }
+
+        // if we're here c is part of the comment and therefore tossed
+        $this->c = $char;
+    }
+
+    /**
+     * Pushes the index ahead to the next instance of the supplied string. If it
+     * is found the first character of the string is returned and the index is set
+     * to it's position.
+     *
+     * @param  string       $string
+     * @return string|false Returns the first character of the string or false.
+     */
+    protected function getNext($string)
+    {
+        // Find the next occurrence of "string" after the current position.
+        $pos = strpos($this->input, $string, $this->index);
+
+        // If it's not there return false.
+        if ($pos === false) {
+            return false;
+        }
+
+        // Adjust position of index to jump ahead to the asked for string
+        $this->index = $pos;
+
+        // Return the first character of that string.
+        return $this->index < $this->len ? $this->input[$this->index] : false;
+    }
+
+    /**
+     * When a javascript string is detected this function crawls for the end of
+     * it and saves the whole string.
+     *
+     * @throws \RuntimeException Unclosed strings will throw an error
+     */
+    protected function saveString()
+    {
+        $startpos = $this->index;
+
+        // saveString is always called after a gets cleared, so we push b into
+        // that spot.
+        $this->a = $this->b;
+
+        // If this isn't a string we don't need to do anything.
+        if (!isset($this->stringDelimiters[$this->a])) {
+            return;
+        }
+
+        // String type is the quote used, " or '
+        $stringType = $this->a;
+
+        // Echo out that starting quote
+        $this->echo($this->a);
+
+        // Loop until the string is done
+        // Grab the very next character and load it into a
+        while (($this->a = $this->getChar()) !== false) {
+            switch ($this->a) {
+
+                // If the string opener (single or double quote) is used
+                // output it and break out of the while loop-
+                // The string is finished!
+                case $stringType:
+                    break 2;
+
+                // New lines in strings without line delimiters are bad- actual
+                // new lines will be represented by the string \n and not the actual
+                // character, so those will be treated just fine using the switch
+                // block below.
+                case "\n":
+                    if ($stringType === '`') {
+                        $this->echo($this->a);
+                    } else {
+                        throw new \RuntimeException('Unclosed string at position: ' . $startpos);
+                    }
+                    break;
+
+                // Escaped characters get picked up here. If it's an escaped new line it's not really needed
+                case '\\':
+
+                    // a is a slash. We want to keep it, and the next character,
+                    // unless it's a new line. New lines as actual strings will be
+                    // preserved, but escaped new lines should be reduced.
+                    $this->b = $this->getChar();
+
+                    // If b is a new line we discard a and b and restart the loop.
+                    if ($this->b === "\n") {
+                        break;
+                    }
+
+                    // echo out the escaped character and restart the loop.
+                    $this->echo($this->a . $this->b);
+                    break;
+
+
+                // Since we're not dealing with any special cases we simply
+                // output the character and continue our loop.
+                default:
+                $this->echo($this->a);
+            }
+        }
+    }
+
+    /**
+     * When a regular expression is detected this function crawls for the end of
+     * it and saves the whole regex.
+     *
+     * @throws \RuntimeException Unclosed regex will throw an error
+     */
+    protected function saveRegex()
+    {
+        if ($this->a != " ") {
+            $this->echo($this->a);
+        }
+
+        $this->echo($this->b);
+
+        while (($this->a = $this->getChar()) !== false) {
+            if ($this->a === '/') {
+                break;
+            }
+
+            if ($this->a === '\\') {
+                $this->echo($this->a);
+                $this->a = $this->getChar();
+            }
+
+            if ($this->a === "\n") {
+                throw new \RuntimeException('Unclosed regex pattern at position: ' . $this->index);
+            }
+
+            $this->echo($this->a);
+        }
+        $this->b = $this->getReal();
+    }
+
+    /**
+     * Checks to see if a character is alphanumeric.
+     *
+     * @param  string $char Just one character
+     * @return bool
+     */
+    protected static function isAlphaNumeric($char)
+    {
+        return preg_match('/^[\w\$\pL]$/', $char) === 1 || $char == '/';
+    }
+
+    protected function endsInKeyword() {
+
+        # When this function is called A is not yet assigned to output.
+        # Regular expression only needs to check final part of output for keyword.
+        $testOutput = substr($this->output . $this->a, -1 * ($this->max_keyword_len + 10));
+
+        foreach(static::$keywords as $keyword) {
+            if (preg_match('/[^\w]'.$keyword.'[ ]?$/i', $testOutput) === 1) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+
+
+    /**
+     * Replace patterns in the given string and store the replacement
+     *
+     * @param  string $js The string to lock
+     * @return bool
+     */
+    protected function lock($js)
+    {
+        /* lock things like <code>"asd" + ++x;</code> */
+        $lock = '"LOCK---' . crc32(time()) . '"';
+
+        $matches = [];
+        preg_match('/([+-])(\s+)([+-])/S', $js, $matches);
+        if (empty($matches)) {
+            return $js;
+        }
+
+        $this->locks[$lock] = $matches[2];
+
+        $js = preg_replace('/([+-])\s+([+-])/S', "$1{$lock}$2", $js);
+        /* -- */
+
+        return $js;
+    }
+
+    /**
+     * Replace "locks" with the original characters
+     *
+     * @param  string $js The string to unlock
+     * @return bool
+     */
+    protected function unlock($js)
+    {
+        if (empty($this->locks)) {
+            return $js;
+        }
+
+        foreach ($this->locks as $lock => $replacement) {
+            $js = str_replace($lock, $replacement, $js);
+        }
+
+        return $js;
+    }
+}