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<?php
/*
* This file is part of Psy Shell.
*
* (c) 2012-2026 Justin Hileman
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Psy\ExecutionLoop;
use PhpParser\NodeTraverser;
use PhpParser\Parser;
use PhpParser\PrettyPrinter;
use Psy\ConfigPaths;
use Psy\Exception\ParseErrorException;
use Psy\OutputAware;
use Psy\ParserFactory;
use Psy\Shell;
use Psy\Util\DependencyChecker;
use Psy\Util\Docblock;
use Symfony\Component\Console\Output\OutputInterface;
/**
* A uopz-based code reloader for modern PHP.
*
* This reloader uses the uopz extension to dynamically reload modified files
* without restarting the REPL session. It parses changed files and uses uopz
* functions to override methods, functions, and constants.
*
* Reload flow:
* 1. On each input, check included files for timestamp changes
* 2. Parse modified files and reload safe elements (methods, unconditional functions)
* 3. Skip unsafe elements (conditional functions/constants) and track in skippedFiles
* 4. When `yolo` command enables force-reload, re-process skipped files with
* safety checks bypassed
*
* Known limitations:
* - Cannot add/remove class properties
* - Cannot change class inheritance or interfaces
* - Cannot change method signatures (parameter types/counts)
*
* However, it can:
* - Reload method implementations (including private/protected)
* - Reload function implementations
* - Reload class and global constants
* - Add new methods and functions
*/
class UopzReloader extends AbstractListener implements OutputAware
{
private Parser $parser;
private PrettyPrinter\Standard $printer;
private ?OutputInterface $output = null;
private ?Shell $shell = null;
/** @var array<string, int> File path => last processed timestamp */
private array $timestamps = [];
/**
* File paths with skipped elements, awaiting force-reload via yolo.
*
* @var array<string, int> File path => last processed timestamp
*/
private array $skippedFiles = [];
/** @var bool Whether to bypass safety warnings (set by yolo command) */
private bool $forceReload = false;
/**
* Only enabled if uopz extension is installed with required functions.
*
* Requires uopz 5.0+ which provides uopz_set_return() and uopz_redefine().
*/
public static function isSupported(): bool
{
return \extension_loaded('uopz') && DependencyChecker::functionsAvailable([
'uopz_set_return',
'uopz_redefine',
'uopz_unset_return',
'uopz_undefine',
]);
}
/**
* Construct a Uopz Reloader.
*/
public function __construct()
{
$this->parser = (new ParserFactory())->createParser();
$this->printer = new PrettyPrinter\Standard();
}
/**
* {@inheritdoc}
*/
public function setOutput(OutputInterface $output): void
{
$this->output = $output;
}
/**
* Enable or disable force-reload mode.
*
* When enabled, safety checks are bypassed and any pending skipped files
* are immediately re-processed.
*/
public function setForceReload(bool $force)
{
$this->forceReload = $force;
// Re-process any skipped files now that force-reload is enabled
if ($force && !empty($this->skippedFiles) && $this->shell !== null) {
$this->reloadSkippedFiles();
}
}
/**
* Re-process files that were previously skipped.
*/
private function reloadSkippedFiles(): void
{
$files = $this->skippedFiles;
$this->skippedFiles = [];
if (\count($files) === 1) {
$this->writeInfo(\sprintf('YOLO: Force-reloading %s', ConfigPaths::prettyPath(\array_key_first($files))));
} else {
$this->writeInfo(\sprintf('YOLO: Force-reloading %d files', \count($files)));
}
foreach ($files as $file => $timestamp) {
$this->reloadFile($file);
$this->timestamps[$file] = $timestamp;
}
}
/**
* Reload code on input.
*/
public function onInput(Shell $shell, string $input)
{
$this->shell = $shell;
$this->reload();
return null;
}
/**
* Look through included files and update anything with a new timestamp.
*/
private function reload(): void
{
\clearstatcache();
$modified = [];
foreach (\get_included_files() as $file) {
// Skip files that no longer exist
if (!\file_exists($file)) {
continue;
}
$timestamp = \filemtime($file);
if (!isset($this->timestamps[$file])) {
$this->timestamps[$file] = $timestamp;
continue;
}
if ($this->timestamps[$file] === $timestamp) {
continue;
}
if (!$this->lintFile($file)) {
$this->writeError(\sprintf('Modified file "%s" has syntax errors and cannot be reloaded', ConfigPaths::prettyPath($file)));
continue;
}
$modified[$file] = $timestamp;
}
if (\count($modified) === 0) {
return;
}
// Clear magic method/property cache since docblocks may have changed
Docblock::clearMagicCache();
// Notify user about reload attempts
if ($this->forceReload) {
if (\count($modified) === 1) {
$this->writeInfo(\sprintf('YOLO: Force-reloading %s', ConfigPaths::prettyPath(\array_key_first($modified))));
} else {
$this->writeInfo(\sprintf('YOLO: Force-reloading %d files', \count($modified)));
}
} else {
if (\count($modified) === 1) {
$this->writeInfo(\sprintf('Reloading %s', ConfigPaths::prettyPath(\array_key_first($modified))));
} else {
$this->writeInfo(\sprintf('Reloading %d files', \count($modified)));
}
}
foreach ($modified as $file => $timestamp) {
$hadSkips = $this->reloadFile($file);
$this->timestamps[$file] = $timestamp;
if ($hadSkips) {
// Track for later force-reload via yolo
$this->skippedFiles[$file] = $timestamp;
} else {
unset($this->skippedFiles[$file]);
}
}
}
/**
* Reload a single file by parsing it and applying uopz overrides.
*
* @return bool True if any elements were skipped (need yolo to force)
*/
private function reloadFile(string $file): bool
{
try {
$code = \file_get_contents($file);
$ast = $this->parser->parse($code);
if ($ast === null) {
return false;
}
$traverser = new NodeTraverser();
$reloader = new UopzReloaderVisitor($this->printer, $this->forceReload);
$traverser->addVisitor($reloader);
$traverser->traverse($ast);
// Check if there were any warnings about limitations
if ($reloader->hasWarnings()) {
foreach ($reloader->getWarnings() as $warning) {
$this->writeWarning($warning);
}
}
return $reloader->hasSkips();
} catch (\Throwable $e) {
$this->writeError(\sprintf('Failed to reload %s: %s', ConfigPaths::prettyPath($file), $e->getMessage()));
return false;
}
}
/**
* Write an info message.
*/
private function writeInfo(string $message): void
{
if ($this->output) {
$this->output->writeln(\sprintf('<whisper>%s</whisper>', $message));
}
}
/**
* Write a warning message.
*/
private function writeWarning(string $message): void
{
if ($this->output) {
$this->output->writeln(\sprintf('<comment>Warning: %s</comment>', $message));
}
}
/**
* Write an error message using shell exception handling.
*/
private function writeError(string $message): void
{
if ($this->shell) {
try {
$this->shell->writeException(new ParseErrorException($message));
return;
} catch (\Throwable $e) {
// Shell not fully initialized, fall back to output
}
}
if ($this->output) {
$this->output->writeln(\sprintf('<error>Error: %s</error>', $message));
}
}
/**
* Check if file has valid PHP syntax.
*/
private function lintFile(string $file): bool
{
try {
$this->parser->parse(\file_get_contents($file));
} catch (\Throwable $e) {
return false;
}
return true;
}
}