<?php
namespace Laravel\Prompts;
use Closure;
use Laravel\Prompts\Exceptions\FormRevertedException;
use Laravel\Prompts\Output\ConsoleOutput;
use RuntimeException;
use Symfony\Component\Console\Output\OutputInterface;
use Throwable;
abstract class Prompt
{
use Concerns\Colors;
use Concerns\Cursor;
use Concerns\Erase;
use Concerns\Events;
use Concerns\FakesInputOutput;
use Concerns\Fallback;
use Concerns\Interactivity;
use Concerns\Themes;
/**
* The current state of the prompt.
*/
public string $state = 'initial';
/**
* The error message from the validator.
*/
public string $error = '';
/**
* The cancel message displayed when this prompt is cancelled.
*/
public string $cancelMessage = 'Cancelled.';
/**
* The previously rendered frame.
*/
protected string $prevFrame = '';
/**
* How many new lines were written by the last output.
*/
protected int $newLinesWritten = 1;
/**
* Whether user input is required.
*/
public bool|string $required;
/**
* The transformation callback.
*/
public ?Closure $transform = null;
/**
* The validator callback or rules.
*/
public mixed $validate;
/**
* The cancellation callback.
*/
protected static ?Closure $cancelUsing;
/**
* Indicates if the prompt has been validated.
*/
protected bool $validated = false;
/**
* The custom validation callback.
*/
protected static ?Closure $validateUsing;
/**
* The revert handler from the StepBuilder.
*/
protected static ?Closure $revertUsing = null;
/**
* The output instance.
*/
protected static OutputInterface $output;
/**
* The terminal instance.
*/
protected static Terminal $terminal;
/**
* Get the value of the prompt.
*/
abstract public function value(): mixed;
/**
* Render the prompt and listen for input.
*/
public function prompt(): mixed
{
try {
$this->capturePreviousNewLines();
if (static::shouldFallback()) {
return $this->fallback();
}
static::$interactive ??= stream_isatty(STDIN);
if (! static::$interactive) {
return $this->default();
}
$this->checkEnvironment();
try {
static::terminal()->setTty('-icanon -isig -echo');
} catch (Throwable $e) {
static::output()->writeln("<comment>{$e->getMessage()}</comment>");
static::fallbackWhen(true);
return $this->fallback();
}
$this->hideCursor();
$this->render();
while (($key = static::terminal()->read()) !== null) {
$continue = $this->handleKeyPress($key);
$this->render();
if ($continue === false || $key === Key::CTRL_C) {
if ($key === Key::CTRL_C) {
if (isset(static::$cancelUsing)) {
return (static::$cancelUsing)();
} else {
static::terminal()->exit();
}
}
if ($key === Key::CTRL_U && self::$revertUsing) {
throw new FormRevertedException;
}
return $this->transformedValue();
}
}
} finally {
$this->clearListeners();
}
}
/**
* Register a callback to be invoked when a user cancels a prompt.
*/
public static function cancelUsing(?Closure $callback): void
{
static::$cancelUsing = $callback;
}
/**
* How many new lines were written by the last output.
*/
public function newLinesWritten(): int
{
return $this->newLinesWritten;
}
/**
* Capture the number of new lines written by the last output.
*/
protected function capturePreviousNewLines(): void
{
$this->newLinesWritten = method_exists(static::output(), 'newLinesWritten')
? static::output()->newLinesWritten()
: 1;
}
/**
* Set the output instance.
*/
public static function setOutput(OutputInterface $output): void
{
self::$output = $output;
}
/**
* Get the current output instance.
*/
protected static function output(): OutputInterface
{
return self::$output ??= new ConsoleOutput;
}
/**
* Write output directly, bypassing newline capture.
*/
protected static function writeDirectly(string $message): void
{
match (true) {
method_exists(static::output(), 'writeDirectly') => static::output()->writeDirectly($message),
method_exists(static::output(), 'getOutput') => static::output()->getOutput()->write($message),
default => static::output()->write($message),
};
}
/**
* Get the terminal instance.
*/
public static function terminal(): Terminal
{
return static::$terminal ??= new Terminal;
}
/**
* Set the custom validation callback.
*/
public static function validateUsing(Closure $callback): void
{
static::$validateUsing = $callback;
}
/**
* Revert the prompt using the given callback.
*
* @internal
*/
public static function revertUsing(Closure $callback): void
{
static::$revertUsing = $callback;
}
/**
* Clear any previous revert callback.
*
* @internal
*/
public static function preventReverting(): void
{
static::$revertUsing = null;
}
/**
* Render the prompt.
*/
protected function render(): void
{
$this->terminal()->initDimensions();
$frame = $this->renderTheme();
if ($frame === $this->prevFrame) {
return;
}
if ($this->state === 'initial') {
static::output()->write($frame);
$this->state = 'active';
$this->prevFrame = $frame;
return;
}
$terminalHeight = $this->terminal()->lines();
$previousFrameHeight = count(explode(PHP_EOL, $this->prevFrame));
$renderableLines = array_slice(explode(PHP_EOL, $frame), abs(min(0, $terminalHeight - $previousFrameHeight)));
$this->moveCursorToColumn(1);
$this->moveCursorUp(min($terminalHeight, $previousFrameHeight) - 1);
$this->eraseDown();
$this->output()->write(implode(PHP_EOL, $renderableLines));
$this->prevFrame = $frame;
}
/**
* Submit the prompt.
*/
protected function submit(): void
{
$this->validate($this->transformedValue());
if ($this->state !== 'error') {
$this->state = 'submit';
}
}
/**
* Handle a key press and determine whether to continue.
*/
private function handleKeyPress(string $key): bool
{
if ($this->state === 'error') {
$this->state = 'active';
}
$this->emit('key', $key);
if ($this->state === 'submit') {
return false;
}
if ($key === Key::CTRL_U) {
if (! self::$revertUsing) {
$this->state = 'error';
$this->error = 'This cannot be reverted.';
return true;
}
$this->state = 'cancel';
$this->cancelMessage = 'Reverted.';
call_user_func(self::$revertUsing);
return false;
}
if ($key === Key::CTRL_C) {
$this->state = 'cancel';
return false;
}
if ($this->validated) {
$this->validate($this->transformedValue());
}
return true;
}
/**
* Transform the input.
*/
private function transform(mixed $value): mixed
{
if (is_null($this->transform)) {
return $value;
}
return call_user_func($this->transform, $value);
}
/**
* Get the transformed value of the prompt.
*/
protected function transformedValue(): mixed
{
return $this->transform($this->value());
}
/**
* Validate the input.
*/
private function validate(mixed $value): void
{
$this->validated = true;
if ($this->required !== false && $this->isInvalidWhenRequired($value)) {
$this->state = 'error';
$this->error = is_string($this->required) && strlen($this->required) > 0 ? $this->required : 'Required.';
return;
}
if (! isset($this->validate) && ! isset(static::$validateUsing)) {
return;
}
$error = match (true) {
is_callable($this->validate) => ($this->validate)($value),
isset(static::$validateUsing) => (static::$validateUsing)($this),
default => throw new RuntimeException('The validation logic is missing.'),
};
if (! is_string($error) && ! is_null($error)) {
throw new RuntimeException('The validator must return a string or null.');
}
if (is_string($error) && strlen($error) > 0) {
$this->state = 'error';
$this->error = $error;
}
}
/**
* Determine whether the given value is invalid when the prompt is required.
*/
protected function isInvalidWhenRequired(mixed $value): bool
{
return $value === '' || $value === [] || $value === false || $value === null;
}
/**
* Check whether the environment can support the prompt.
*/
private function checkEnvironment(): void
{
if (PHP_OS_FAMILY === 'Windows') {
throw new RuntimeException('Prompts is not currently supported on Windows. Please use WSL or configure a fallback.');
}
}
/**
* Restore the cursor and terminal state.
*/
public function __destruct()
{
$this->restoreCursor();
static::terminal()->restoreTty();
}
}
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