commit e6e99a1d5c4e13cd3f1251f5c70a023d44d4e063
Author: Dustin Wilson <dustin@dustinwilson.com>
Date:   Sat Sep 24 12:05:33 2022 -0500

    Initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a7aa609
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,76 @@
+# Catcher-specific
+/test*.html
+/test*.php
+/test/*
+
+# General
+*.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+# Windows thumbnail cache files
+Thumbs.db
+ehthumbs.db
+ehthumbs_vista.db
+
+# Dump file
+*.stackdump
+
+# Folder config file
+Desktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
+
+/vendor/
+/vendor-bin/*/vendor
+/tests/html5lib-tests
+/tests/.phpunit.result.cache
+/tests/coverage
+cachegrind.out.*
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..979ed23
--- /dev/null
+++ b/README.md
@@ -0,0 +1,12 @@
+# Catcher
+
+Catcher is a Throwable catcher and error handling library for PHP.
+
+## Example
+
+```php
+$catcher = new Catcher(new PlainTextHandler([
+    'outputBacktrace' => true,
+    'backtraceArgFrameLimit' => 2
+]));
+```
\ No newline at end of file
diff --git a/composer.json b/composer.json
new file mode 100644
index 0000000..477bd24
--- /dev/null
+++ b/composer.json
@@ -0,0 +1,22 @@
+{
+    "name": "mensbeam/catcher",
+    "description": "Catches exceptions, errors, and shutdowns",
+    "type": "library",
+    "license": "MIT",
+    "autoload": {
+        "psr-4": {
+            "Mensbeam\\Framework\\": "lib/",
+            "Mensbeam\\Framework\\Test\\": "test/"
+        }
+    },
+    "authors": [
+        {
+            "name": "Dustin Wilson",
+            "email": "dustin@dustinwilson.com"
+        }
+    ],
+    "require": {
+        "php": ">=8.1",
+        "psr/log": "^3.0"
+    }
+}
diff --git a/composer.lock b/composer.lock
new file mode 100644
index 0000000..7fc2812
--- /dev/null
+++ b/composer.lock
@@ -0,0 +1,71 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "8998cce6e05b3ccc6aca7c736416f570",
+    "packages": [
+        {
+            "name": "psr/log",
+            "version": "3.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-fig/log.git",
+                "reference": "fe5ea303b0887d5caefd3d431c3e61ad47037001"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/php-fig/log/zipball/fe5ea303b0887d5caefd3d431c3e61ad47037001",
+                "reference": "fe5ea303b0887d5caefd3d431c3e61ad47037001",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.0.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Psr\\Log\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "PHP-FIG",
+                    "homepage": "https://www.php-fig.org/"
+                }
+            ],
+            "description": "Common interface for logging libraries",
+            "homepage": "https://github.com/php-fig/log",
+            "keywords": [
+                "log",
+                "psr",
+                "psr-3"
+            ],
+            "support": {
+                "source": "https://github.com/php-fig/log/tree/3.0.0"
+            },
+            "time": "2021-07-14T16:46:02+00:00"
+        }
+    ],
+    "packages-dev": [],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": {
+        "php": ">=8.1"
+    },
+    "platform-dev": [],
+    "plugin-api-version": "2.3.0"
+}
diff --git a/lib/Catcher.php b/lib/Catcher.php
new file mode 100644
index 0000000..1616416
--- /dev/null
+++ b/lib/Catcher.php
@@ -0,0 +1,101 @@
+<?php
+/** 
+ * @license MIT
+ * Copyright 2022 Dustin Wilson, et al.
+ * See LICENSE and AUTHORS files for details 
+ */
+
+declare(strict_types=1);
+namespace Mensbeam\Framework;
+use Mensbeam\Framework\Catcher\{
+    ThrowableController,
+    ThrowableHandler
+};
+
+
+class Catcher {
+    /** 
+     * Array of handlers the exceptions are passed to
+     * 
+     * @var ThrowableHandler[] 
+     */
+    protected array $handlers = [];
+    /** Flag set when the shutdown handler is run */
+    protected bool $isShuttingDown = false;
+
+
+
+
+    public function __construct(ThrowableHandler ...$handlers) {
+        $this->handlers = $handlers;
+        $prev = set_error_handler([ $this, 'handleError' ]);
+        $prev = set_exception_handler([ $this, 'handleThrowable' ]);
+        register_shutdown_function([ $this, 'handleShutdown' ]);
+    }
+
+
+
+    /** 
+     * Gets the list of handlers
+     * 
+     * @return ThrowableHandler[] 
+     */
+    public function getHandlers(): array {
+        return $this->handlers;
+    }
+
+    /** 
+     * Converts regular errors into throwable Errors for easier handling; meant to be 
+     * used with set_error_handler.
+     * 
+     * @internal
+     */
+    public function handleError(int $code, string $message, ?string $file = null, ?int $line = null): bool {
+        if ($code !== 0 && error_reporting()) {
+            $error = new Error($message, $code, $file, $line);
+            if ($this->isShuttingDown) {
+                throw $error;
+            } else {
+                $this->handleThrowable($error);
+            }
+
+            return true;
+        }
+
+        return false;
+    }
+
+    /** 
+     * Handles both Exceptions and Errors; meant to be used with set_exception_handler.
+     * 
+     * @internal
+     */
+    public function handleThrowable(\Throwable $throwable): void {
+        $controller = new ThrowableController($throwable);
+        foreach ($this->handlers as $h) {
+            // If the handler returns true it means the handler handled the exception properly, 
+            // and there's no reason to pass it off to another.
+            if ($h->handle($throwable, $controller)) {
+                break;
+            }
+        }
+
+        if ($this->isShuttingDown || $throwable instanceof \Exception || in_array($throwable->getCode(), [ \E_ERROR, \E_PARSE, \E_CORE_ERROR, \E_COMPILE_ERROR, \E_USER_ERROR ])) {
+            exit($throwable->getCode());
+        }
+    }
+
+    /** 
+     * Handles shutdowns, passes all possible built-in error codes to the error handler.
+     * 
+     * @internal
+     */
+    public function handleShutdown() {
+        $this->isShuttingDown = true;
+        
+        $error = error_get_last();
+        if ($error && in_array($error['type'], [ \E_ERROR, \E_PARSE, \E_CORE_ERROR, \E_CORE_WARNING, \E_COMPILE_ERROR, \E_COMPILE_WARNING ])) {
+            $this->handleError($error['type'], $error['message'], $error['file'], $error['line']);
+        }
+    }
+}
\ No newline at end of file
diff --git a/lib/Catcher/PlainTextHandler.php b/lib/Catcher/PlainTextHandler.php
new file mode 100644
index 0000000..323d31e
--- /dev/null
+++ b/lib/Catcher/PlainTextHandler.php
@@ -0,0 +1,221 @@
+<?php
+/** 
+ * @license MIT
+ * Copyright 2022 Dustin Wilson, et al.
+ * See LICENSE and AUTHORS files for details 
+ */
+
+declare(strict_types=1);
+namespace Mensbeam\Framework\Catcher;
+use \Psr\Log\{
+    LoggerAwareInterface,
+    LoggerInterface
+};
+
+
+class PlainTextHandler extends ThrowableHandler implements LoggerAwareInterface {
+    protected static ?string $contentType = 'text/plain';
+
+    /** The number of backtrace frames in which to print arguments; defaults to 5 */
+    protected int $_backtraceArgFrameLimit = 5;
+    /** The PSR-3 compatible logger in which to log to; defaults to null (no logging) */
+    protected ?LoggerInterface $_logger = null;
+    /** If true the handler will output backtraces; defaults to false */
+    protected bool $_outputBacktrace = false;
+    /** If true the handler will output previous throwables; defaults to true */
+    protected bool $_outputPrevious = true;
+    /** 
+     * If true the handler will output times to the output. This is ignored by the 
+     * logger which should have its own timestamping methods; defaults to true 
+     */
+    protected bool $_outputTime = true;
+    /** The PHP-standard date format which to use for times printed to output */
+    protected string $_timeFormat = '[H:i:s]';
+
+
+
+
+    public function __construct(array $config = []) {
+        parent::__construct($config);
+    }
+
+
+
+
+    public function getBacktraceArgFrameLimit(): int {
+        return $this->_getBacktraceArgFrameLimit;
+    }
+
+    public function getLogger(): ?LoggerInterface {
+        return $this->_logger;
+    }
+
+    public function getOutputBacktrace(): bool {
+        return $this->_outputBacktrace;
+    }
+
+    public function getOutputPrevious(): bool {
+        return $this->_outputPrevious;
+    }
+
+    public function getOutputTime(): bool {
+        return $this->_outputTime;
+    }
+
+    public function getTimeFormat(): bool {
+        return $this->_timeFormat;
+    }
+
+    public function handle(\Throwable $throwable, ThrowableController $controller): bool {
+        // If this can't output and there's no logger to log to then there's nothing to do 
+        // here. Continue on to the next handler.
+        if (!$this->_output && $this->_logger === null) {
+            return false;
+        }
+
+        $message = $this->serializeThrowable($throwable, $controller);
+        if ($this->_outputPrevious) {
+            $prev = $throwable->getPrevious();
+            $prevController = $controller->getPrevious();
+            while ($prev) {
+                $message .= sprintf("\n\nCaused by ↴\n%s", $this->serializeThrowable($prev, $prevController));
+                $prev = $prev->getPrevious();
+                $prevController = $prevController->getPrevious();
+            }
+        }
+
+        if ($this->_outputBacktrace) {
+            $frames = $controller->getFrames();
+            $message .= "\nStack trace:";
+
+            $num = 1;
+            foreach ($frames as $frame) {
+                $class = (!empty($frame['error'])) ? "{$frame['error']} ({$frame['class']})" : $frame['class'] ?? '';
+                $function = $frame['function'] ?? '';
+
+                $args = '';
+                if (!empty($frame['args']) && $this->_backtraceArgFrameLimit >= $num) {
+                    $args = "\n" . preg_replace('/^/m', str_repeat(' ', strlen((string)$num) + 2) . '| ', var_export($frame['args'], true));
+                }
+
+                $template = "\n%3d. %s";
+                if ($class && $function) {
+                    $template .= '::';
+                }
+                $template .= ($function) ? '%s()' : '%s';
+                $template .= '  %s:%d%s';
+
+                $message .= sprintf(
+                    "$template\n",
+                    $num++,
+                    $class,
+                    $function,
+                    $frame['file'],
+                    $frame['line'],
+                    $args
+                );
+            }
+        }
+
+        if ($this->_logger !== null) {
+            $this->log($throwable, $message);
+        }
+
+        if ($this->_output) {
+            // Logger handles its own timestamps
+            if ($this->_outputTime && $this->_timeFormat !== '') {
+                $time = (new \DateTime())->format($this->_timeFormat) . '  ';
+                $timeStrlen = strlen($time);
+
+                $message = preg_replace('/^/m', str_repeat(' ', $timeStrlen), $message);
+                $message = preg_replace('/^ {' . $timeStrlen . '}/', $time, $message);
+            }
+
+            if (\PHP_SAPI === 'cli') {
+                fprintf(\STDERR, "$message\n");
+            } else {
+                $this->sendContentTypeHeader();
+                http_response_code(500);
+                echo "$message\n";
+            }
+    
+            return (!$this->_passthrough);
+        }
+
+        return false;
+    }
+
+    public function setBacktraceArgFrameLimit(int $value): void {
+        $this->_getBacktraceArgFrameLimit = $value;
+    }
+
+    public function setLogger(?LoggerInterface $value): void {
+        $this->_logger = $value;
+    }
+
+    public function setOutputBacktrace(bool $value): void {
+        $this->_outputBacktrace = $value;
+    }
+
+    public function setOutputPrevious(bool $value): void {
+        $this->_outputPrevious = $value;
+    }
+
+    public function setOutputTime(bool $value): void {
+        $this->_outputTime = $value;
+    }
+
+    public function setTimeFormat(bool $value): void {
+        $this->_timeFormat = $value;
+    }
+
+
+    protected function log(\Throwable $throwable, string $message): void {
+        if ($throwable instanceof \Error) {
+            switch ($throwable->getCode()) {
+                case \E_NOTICE:
+                case \E_USER_NOTICE:
+                case \E_STRICT:
+                    $this->_logger->notice($message);
+                break;
+                case \E_WARNING:
+                case \E_COMPILE_WARNING:
+                case \E_USER_WARNING:
+                case \E_DEPRECATED:
+                case \E_USER_DEPRECATED:
+                    $this->_logger->warning($message);
+                break;
+                case \E_RECOVERABLE_ERROR:
+                    $this->_logger->error($message);
+                break;
+                case \E_PARSE:
+                case \E_CORE_ERROR:
+                case \E_COMPILE_ERROR:
+                    $this->_logger->alert($message);
+                break;
+            }
+        } elseif ($throwable instanceof \Exception) {
+            if ($throwable instanceof \PharException || $throwable instanceof \RuntimeException) {
+                $this->_logger->alert($message);
+            }
+        }
+
+        $this->_logger->critical($message);
+    }
+
+    protected function serializeThrowable(\Throwable $throwable, ThrowableController $controller): string {
+        $class = $throwable::class;
+        if ($throwable instanceof \Error) {
+            $type = $controller->getErrorType();
+            $class = ($type !== null) ? "$type (" . $throwable::class . ")" : $throwable::class;
+        }
+
+        return sprintf(
+            '%s: %s in file %s on line %d',
+            $class,
+            $throwable->getMessage(),
+            $throwable->getFile(),
+            $throwable->getLine()
+        );
+    }
+}
\ No newline at end of file
diff --git a/lib/Catcher/ThrowableController.php b/lib/Catcher/ThrowableController.php
new file mode 100644
index 0000000..9a1e85c
--- /dev/null
+++ b/lib/Catcher/ThrowableController.php
@@ -0,0 +1,202 @@
+<?php
+/** 
+ * @license MIT
+ * Copyright 2022 Dustin Wilson, et al.
+ * See LICENSE and AUTHORS files for details 
+ */
+
+declare(strict_types=1);
+namespace Mensbeam\Framework\Catcher;
+
+
+class ThrowableController {
+    private string|bool|null $errorType = false;
+    private ?array $frames = null;
+    private ThrowableController|bool|null $previousThrowableController = false;
+
+    private \Throwable $throwable;
+
+
+
+
+    public function __construct(\Throwable $throwable) {
+        $this->throwable = $throwable;
+    }
+
+
+
+    /** Gets the type name for an Error object */
+    public function getErrorType(): ?string {
+        if ($this->errorType !== false) {
+            return $this->errorType;
+        }
+
+        if (!$this->throwable instanceof \Error) {
+            $this->errorType = null;
+            return null;
+        }
+
+        switch ($this->throwable->getCode()) {
+            case \E_ERROR: 
+                $this->errorType = 'PHP Fatal Error';
+            break;
+            case \E_WARNING:
+                $this->errorType = 'PHP Warning';
+            break;
+            case \E_PARSE:
+                $this->errorType = 'PHP Parsing Error';
+            break;
+            case \E_NOTICE:
+                $this->errorType = 'PHP Notice';
+            break;
+            case \E_CORE_ERROR: 
+                $this->errorType = 'PHP Core Error';
+            break;
+            case \E_CORE_WARNING:
+                $this->errorType = 'PHP Core Warning';
+            break;
+            case \E_COMPILE_ERROR:
+                $this->errorType = 'Compile Error';
+            break;
+            case \E_COMPILE_WARNING:
+                $this->errorType = 'Compile Warning';
+            break;
+            case \E_STRICT:
+                $this->errorType = 'Runtime Notice';
+            break;
+            case \E_RECOVERABLE_ERROR:
+                $this->errorType = 'Recoverable Error';
+            break;
+            case \E_DEPRECATED:
+            case \E_USER_DEPRECATED:
+                $this->errorType = 'Deprecated';
+            break;
+            case \E_USER_ERROR:
+                $this->errorType = 'Fatal Error';
+            break;
+            case \E_USER_WARNING:
+                $this->errorType = 'Warning';
+            break;
+            case \E_USER_NOTICE:
+                $this->errorType = 'Notice';
+            break;
+            default:
+                $this->errorType = null;
+        }
+
+        return $this->errorType;
+    }
+
+    /** Gets backtrace frames */
+    public function getFrames(): array {
+        if ($this->frames !== null) {
+            return $this->frames;
+        }
+
+        if (
+            !$this->throwable instanceof \Error ||
+            !in_array($this->throwable->getCode(), [ E_ERROR, E_PARSE, E_CORE_ERROR, E_CORE_WARNING, E_COMPILE_ERROR, E_COMPILE_WARNING ]) ||
+            !extension_loaded('xdebug') || 
+            !function_exists('xdebug_info') || 
+            sizeof(xdebug_info('mode')) === 0
+        ) {
+            $frames = $this->throwable->getTrace();
+        } else {
+            $frames = array_diff_key(array_reverse(xdebug_get_function_stack()), debug_backtrace(\DEBUG_BACKTRACE_IGNORE_ARGS));
+        }
+
+        // PHP for some stupid reason thinks it's okay not to provide line numbers and file 
+        // names when using call_user_func_array; this fixes that. 
+        // (https://bugs.php.net/bug.php?id=44428)
+        foreach ($frames as $key => $frame) {
+            if (empty($frame['file'])) {
+                $file = '[INTERNAL]';
+                $line = 0;
+
+                $next = $frames[$key + 1] ?? [];
+
+                if (
+                    !empty($frame['file']) && 
+                    !empty($frame['function']) &&
+                    !empty($frame['line']) && 
+                    str_contains($frame['function'], 'call_user_func')
+                ) {
+                    $file = $next['file'];
+                    $line = $next['line'];
+                }
+
+                $frames[$key]['file'] = $file;
+                $frames[$key]['line'] = $line;
+            }
+
+            $frames[$key]['line'] = (int)$frames[$key]['line'];
+        }
+
+        // Delete everything that has anything to do with userland error handling
+        for ($frameCount = count($frames), $i = $frameCount - 1; $i >= 0; $i--) {
+            $frame = $frames[$i];
+            if ($frame['file'] === $this->throwable->getFile() && $frame['line'] === $this->throwable->getLine()) {
+                array_splice($frames, 0, $i);
+                break;
+            }
+        }
+
+        // Add a frame for the throwable to the beginning of the array
+        $f = [
+            'file' => $this->throwable->getFile(),
+            'line' => (int)$this->throwable->getLine(),
+            'class' => $this->throwable::class,
+            'args' => [
+                $this->throwable->getMessage()
+            ]
+        ];
+
+        // Add the error name if it is an Error.
+        if ($this->throwable instanceof \Error) {
+            $error = $this->getErrorType();
+            if ($error !== null) {
+                $f['error'] = $error;
+            }
+        }
+
+        array_unshift($frames, $f);
+
+        // Go through previous throwables and merge in their frames
+        if ($prev = $this->getPrevious()) {
+            $a = $frames;
+            $b = $prev->getFrames();
+            $prevThrowable = $prev->getThrowable();
+
+            $diff = $a;
+            for ($i = count($a) - 1, $j = count($b) - 1; $i >= 0 && $j >= 0; $i--, $j--) {
+                $af = $diff[$i]['file'];
+                $bf = $b[$j]['file'];
+                if ($af && $bf && $af === $bf && $diff[$i]['line'] === $b[$j]['line']) {
+                    unset($diff[$i]);
+                }
+            }
+
+            $frames = [ ...$diff, ...$b ];
+        }
+
+        $this->frames = $frames;
+        return $frames;
+    }
+
+    public function getPrevious(): ?ThrowableController {
+        if ($this->previousThrowableController !== false) {
+            return $this->previousThrowableController;
+        }
+
+        if ($prev = $this->throwable->getPrevious()) {
+            $prev = new ThrowableController($prev);
+        }
+
+        $this->previousThrowableController = $prev;
+        return $prev;
+    }
+
+    public function getThrowable(): \Throwable {
+        return $this->throwable;
+    }
+}
\ No newline at end of file
diff --git a/lib/Catcher/ThrowableHandler.php b/lib/Catcher/ThrowableHandler.php
new file mode 100644
index 0000000..0b0332b
--- /dev/null
+++ b/lib/Catcher/ThrowableHandler.php
@@ -0,0 +1,66 @@
+<?php
+/** 
+ * @license MIT
+ * Copyright 2022 Dustin Wilson, et al.
+ * See LICENSE and AUTHORS files for details 
+ */
+
+declare(strict_types=1);
+namespace Mensbeam\Framework\Catcher;
+
+
+abstract class ThrowableHandler {
+    protected static ?string $contentType = null;
+
+    /** If true the handler will output data; if false it will be silent */
+    protected bool $_output = true;
+    /** 
+     * If true the handler will pass on through to the next handler even if it 
+     * successfully handles the throwable; if false it will prevent execution of the 
+     * next handler if it successfully handles the throwable 
+     */
+    protected bool $_passthrough = false;
+
+
+
+
+    public function __construct(array $config = []) {
+        foreach ($config as $key => $value) {
+            $key = "_$key";
+            $this->$key = $value;
+        }
+    }
+
+
+
+    
+    public function getContentType(): ?string {
+        return static::$contentType;
+    }
+
+    public function getOutput(): bool {
+        return $this->_output;
+    }
+
+    public function getPassthrough(): bool {
+        return $this->_passthrough;
+    }
+
+    abstract public function handle(\Throwable $throwable, ThrowableController $controller): bool;
+
+    public function setOutput(bool $value): void {
+        $this->_output = $value;
+    }
+
+    public function setPassthrough(bool $value): void {
+        $this->_passthrough = $value;
+    }
+
+    protected function sendContentTypeHeader(): void {
+        if (!isset($_SERVER['REQUEST_URI']) || headers_sent()) {
+            return;
+        }
+
+        header('Content-Type: ' . static::$contentType);
+    }
+}
\ No newline at end of file
diff --git a/lib/Error.php b/lib/Error.php
new file mode 100644
index 0000000..a69d753
--- /dev/null
+++ b/lib/Error.php
@@ -0,0 +1,17 @@
+<?php
+/** 
+ * @license MIT
+ * Copyright 2022 Dustin Wilson, et al.
+ * See LICENSE and AUTHORS files for details 
+ */
+
+declare(strict_types=1);
+namespace Mensbeam\Framework;
+
+class Error extends \Error {
+    public function __construct(string $message = '', int $code = 0, ?string $file = null, ?int $line = line, ?\Throwable $previous = null) {
+        parent::__construct($message, $code, $previous);
+        $this->file = $file;
+        $this->line = $line;
+    }
+}
\ No newline at end of file