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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Celema\Console; |
| 6 | |
| 7 | use Celema\Console\Exception\InvalidUsage; |
| 8 | use ReflectionClass; |
| 9 | use ReflectionMethod; |
| 10 | use ReflectionNamedType; |
| 11 | use ReflectionParameter; |
| 12 | use ValueError; |
| 13 | |
| 14 | /** |
| 15 | * The interface a command declares with its `__invoke()` parameters. |
| 16 | * |
| 17 | * Parameters typed `Args` or `Io` are injected; `#[Arg]` and `#[Opt]` |
| 18 | * parameters receive the converted command-line input and form the |
| 19 | * command's complete interface, together with the `#[Opt]` constructor |
| 20 | * parameters of option groups. Declaration errors surface when the |
| 21 | * signature is read, input errors when it is bound. |
| 22 | * |
| 23 | * @internal |
| 24 | */ |
| 25 | final class Signature |
| 26 | { |
| 27 | /** @var list<Argument> */ |
| 28 | private array $arguments = []; |
| 29 | |
| 30 | /** |
| 31 | * Keyed by long name. |
| 32 | * |
| 33 | * @var array<string, Option> |
| 34 | */ |
| 35 | private array $options = []; |
| 36 | |
| 37 | /** |
| 38 | * The long names keyed by short name. |
| 39 | * |
| 40 | * @var array<string, string> |
| 41 | */ |
| 42 | private array $aliases = []; |
| 43 | |
| 44 | /** |
| 45 | * The long names of negatable flags keyed by their `--no-` name. |
| 46 | * |
| 47 | * @var array<string, string> |
| 48 | */ |
| 49 | private array $negations = []; |
| 50 | |
| 51 | /** |
| 52 | * The names of the injected parameters, keyed by class. |
| 53 | * |
| 54 | * @var array<string, string> |
| 55 | */ |
| 56 | private array $injected = []; |
| 57 | |
| 58 | /** |
| 59 | * The option group classes, keyed by parameter name. |
| 60 | * |
| 61 | * @var array<string, class-string> |
| 62 | */ |
| 63 | private array $groups = []; |
| 64 | |
| 65 | /** |
| 66 | * The names of all `__invoke()` parameters, in declaration order. |
| 67 | * |
| 68 | * @var list<string> |
| 69 | */ |
| 70 | private array $parameters = []; |
| 71 | |
| 72 | private function __construct( |
| 73 | private readonly string $full, |
| 74 | ) {} |
| 75 | |
| 76 | /** |
| 77 | * Reads the signature of a command class. |
| 78 | * |
| 79 | * @param class-string $class |
| 80 | * @param string $full The command's full name, for error messages |
| 81 | */ |
| 82 | public static function of(string $class, string $full): self |
| 83 | { |
| 84 | $command = new ReflectionClass($class); |
| 85 | |
| 86 | if (!$command->hasMethod('__invoke')) { |
| 87 | throw new ValueError("Command '{$full}' is not callable"); |
| 88 | } |
| 89 | |
| 90 | $method = $command->getMethod('__invoke'); |
| 91 | $return = $method->getReturnType(); |
| 92 | |
| 93 | if (!$return instanceof ReflectionNamedType || $return->getName() !== 'int' || $return->allowsNull()) { |
| 94 | throw new ValueError("Command '{$full}' must declare the return type int"); |
| 95 | } |
| 96 | |
| 97 | $signature = new self($full); |
| 98 | |
| 99 | foreach ($method->getParameters() as $parameter) { |
| 100 | $signature->add($parameter); |
| 101 | } |
| 102 | |
| 103 | $signature->checkArguments(); |
| 104 | |
| 105 | return $signature; |
| 106 | } |
| 107 | |
| 108 | /** |
| 109 | * Converts a parameter name to the kebab-case of command-line names. |
| 110 | * |
| 111 | * A word ends at an underscore, at a capital after a lowercase letter |
| 112 | * or digit, and at the last capital of an acronym: `HTMLOnly` is |
| 113 | * `html-only`. |
| 114 | */ |
| 115 | public static function kebab(string $name): string |
| 116 | { |
| 117 | $words = preg_replace( |
| 118 | '/(?<=[a-z0-9])(?=[A-Z])|(?<=[A-Z])(?=[A-Z][a-z])|(?<=[a-zA-Z0-9])_+(?=[a-zA-Z0-9])/', |
| 119 | replacement: '-', |
| 120 | subject: $name, |
| 121 | ); |
| 122 | |
| 123 | return strtolower($words ?? $name); |
| 124 | } |
| 125 | |
| 126 | /** @return list<Argument> */ |
| 127 | public function arguments(): array |
| 128 | { |
| 129 | return $this->arguments; |
| 130 | } |
| 131 | |
| 132 | /** @return array<string, Option> Keyed by long name */ |
| 133 | public function options(): array |
| 134 | { |
| 135 | return $this->options; |
| 136 | } |
| 137 | |
| 138 | /** |
| 139 | * Whether the tokens ask the runner for the help screen, with `--help` |
| 140 | * or `-h`. |
| 141 | * |
| 142 | * A command declaring `--help` answers both itself, and a `-h` declared |
| 143 | * as the short name of another option stays that option's. |
| 144 | * |
| 145 | * @throws InvalidUsage |
| 146 | * |
| 147 | * @param list<string> $tokens |
| 148 | */ |
| 149 | public function asksForHelp(array $tokens): bool |
| 150 | { |
| 151 | if (array_key_exists('--help', $this->options)) { |
| 152 | return false; |
| 153 | } |
| 154 | |
| 155 | // Parsing replaces a declared `-h` with its long name. |
| 156 | [$args] = $this->parse($tokens); |
| 157 | |
| 158 | foreach (['--help', '-h'] as $name) { |
| 159 | if (!$args->has($name)) { |
| 160 | continue; |
| 161 | } |
| 162 | |
| 163 | if ($args->opts($name) !== []) { |
| 164 | throw new InvalidUsage("Option '{$name}' does not accept a value"); |
| 165 | } |
| 166 | |
| 167 | return true; |
| 168 | } |
| 169 | |
| 170 | return false; |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * Validates the command-line tokens against the declarations and |
| 175 | * converts them to the named arguments of `__invoke()`. |
| 176 | * |
| 177 | * @throws InvalidUsage |
| 178 | * |
| 179 | * Absent options and optional arguments are left out, so the |
| 180 | * parameters' defaults apply. |
| 181 | * |
| 182 | * @param list<string> $tokens |
| 183 | * @return array<string, mixed> |
| 184 | */ |
| 185 | public function bind(array $tokens, Io $io): array |
| 186 | { |
| 187 | [$args, $counts, $bare] = $this->parse($tokens); |
| 188 | $values = []; |
| 189 | |
| 190 | foreach ($this->injected as $class => $name) { |
| 191 | $values[$name] = $class === Args::class ? $args : $io; |
| 192 | } |
| 193 | |
| 194 | $grouped = []; |
| 195 | |
| 196 | foreach ($args->names() as $name) { |
| 197 | $long = $this->negations[$name] ?? $name; |
| 198 | $option = $this->options[$long] ?? throw new InvalidUsage($this->unknownOption($name)); |
| 199 | |
| 200 | if ($long !== $name && $args->has($long)) { |
| 201 | throw new InvalidUsage("Option '{$long}' cannot be combined with '{$name}'"); |
| 202 | } |
| 203 | |
| 204 | $value = $option->value($args, $name, $counts[$name], array_key_exists($name, $bare)); |
| 205 | |
| 206 | if ($option->group === null) { |
| 207 | $values[$option->parameter->name] = $value; |
| 208 | } else { |
| 209 | $grouped[$option->group][$option->parameter->name] = $value; |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | foreach ($this->groups as $name => $class) { |
| 214 | /** @psalm-suppress MixedMethodCall The group class is known only at runtime */ |
| 215 | $values[$name] = new $class(...$grouped[$name] ?? []); |
| 216 | } |
| 217 | |
| 218 | return [...$values, ...$this->bindArguments($args->positionals())]; |
| 219 | } |
| 220 | |
| 221 | /** |
| 222 | * Renames the bound values to the parameters of the command's own |
| 223 | * `__invoke()`, matching them by position. |
| 224 | * |
| 225 | * The values are bound to the registered class, but a factory may |
| 226 | * return a subclass whose override renames the parameters. |
| 227 | * |
| 228 | * @param array<string, mixed> $values |
| 229 | * @return array<string, mixed> |
| 230 | * |
| 231 | * @psalm-suppress MixedAssignment The values are of any parameter type |
| 232 | */ |
| 233 | public function match(array $values, object $command): array |
| 234 | { |
| 235 | $parameters = new ReflectionMethod($command, '__invoke')->getParameters(); |
| 236 | $matched = []; |
| 237 | |
| 238 | foreach ($this->parameters as $position => $name) { |
| 239 | if (array_key_exists($name, $values)) { |
| 240 | $matched[$parameters[$position]->name] = $values[$name]; |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | return $matched; |
| 245 | } |
| 246 | |
| 247 | private function add(ReflectionParameter $parameter): void |
| 248 | { |
| 249 | $this->parameters[] = $parameter->name; |
| 250 | $arg = $parameter->getAttributes(Arg::class)[0] ?? null; |
| 251 | $opt = $parameter->getAttributes(Opt::class)[0] ?? null; |
| 252 | |
| 253 | if ($arg !== null && $opt !== null) { |
| 254 | throw new ValueError( |
| 255 | "Command '{$this->full}' parameter \${$parameter->name} cannot carry both #[Arg] and #[Opt]", |
| 256 | ); |
| 257 | } |
| 258 | |
| 259 | if ($arg !== null) { |
| 260 | $this->addArgument(new Argument($parameter, $arg->newInstance(), $this->type($parameter))); |
| 261 | |
| 262 | return; |
| 263 | } |
| 264 | |
| 265 | if ($opt !== null) { |
| 266 | $this->addOption(new Option($parameter, $opt->newInstance(), $this->type($parameter))); |
| 267 | |
| 268 | return; |
| 269 | } |
| 270 | |
| 271 | $this->inject($parameter); |
| 272 | } |
| 273 | |
| 274 | private function type(ReflectionParameter $parameter): Type |
| 275 | { |
| 276 | if ($parameter->isVariadic()) { |
| 277 | throw new ValueError( |
| 278 | "Command '{$this->full}' parameter \${$parameter->name} cannot be variadic; declare it as array", |
| 279 | ); |
| 280 | } |
| 281 | |
| 282 | return ( |
| 283 | Type::of($parameter) |
| 284 | ?? throw new ValueError( |
| 285 | "Command '{$this->full}' parameter \${$parameter->name} must be declared as " |
| 286 | . 'string, int, float, bool, array, or a backed enum', |
| 287 | ) |
| 288 | ); |
| 289 | } |
| 290 | |
| 291 | private function addArgument(Argument $argument): void |
| 292 | { |
| 293 | if ($argument->type->name === 'bool') { |
| 294 | throw new ValueError( |
| 295 | "Command '{$this->full}' argument '<{$argument->name}>' cannot be a bool; declare a flag with #[Opt]", |
| 296 | ); |
| 297 | } |
| 298 | |
| 299 | $this->arguments[] = $argument; |
| 300 | } |
| 301 | |
| 302 | private function addOption(Option $option): void |
| 303 | { |
| 304 | $this->checkOption($option); |
| 305 | |
| 306 | foreach ([$option->name, $option->opt->short, $option->negation ?? ''] as $name) { |
| 307 | if ( |
| 308 | array_key_exists($name, $this->options) |
| 309 | || array_key_exists($name, $this->aliases) |
| 310 | || array_key_exists($name, $this->negations) |
| 311 | ) { |
| 312 | throw new ValueError("Command '{$this->full}' declares the option name '{$name}' twice"); |
| 313 | } |
| 314 | } |
| 315 | |
| 316 | $this->options[$option->name] = $option; |
| 317 | |
| 318 | if ($option->opt->short !== '') { |
| 319 | $this->aliases[$option->opt->short] = $option->name; |
| 320 | } |
| 321 | |
| 322 | if ($option->negation !== null) { |
| 323 | $this->negations[$option->negation] = $option->name; |
| 324 | } |
| 325 | } |
| 326 | |
| 327 | private function checkOption(Option $option): void |
| 328 | { |
| 329 | $parameter = $option->parameter; |
| 330 | $prefix = "Command '{$this->full}'"; |
| 331 | |
| 332 | // PHP also drops the default of a parameter declared before a |
| 333 | // required one. |
| 334 | if (!$parameter->isDefaultValueAvailable()) { |
| 335 | throw new ValueError("{$prefix} option '{$option->name}' needs a default value"); |
| 336 | } |
| 337 | |
| 338 | $bare = $option->opt->bare; |
| 339 | |
| 340 | if ($option->type->name === 'bool') { |
| 341 | if ($option->opt->value !== '' || $bare !== null) { |
| 342 | throw new ValueError("{$prefix} flag '{$option->name}' takes no value"); |
| 343 | } |
| 344 | } elseif ($bare !== null) { |
| 345 | if ($option->type->name === 'array') { |
| 346 | throw new ValueError("{$prefix} repeatable option '{$option->name}' cannot have a bare value"); |
| 347 | } |
| 348 | |
| 349 | if ($option->type->convert($bare) === null) { |
| 350 | throw new ValueError( |
| 351 | "{$prefix} option '{$option->name}' needs {$option->type->expected()} as bare value, got '{$bare}'", |
| 352 | ); |
| 353 | } |
| 354 | } |
| 355 | } |
| 356 | |
| 357 | private function inject(ReflectionParameter $parameter): void |
| 358 | { |
| 359 | $type = $parameter->getType(); |
| 360 | $class = $type instanceof ReflectionNamedType && !$type->allowsNull() && !$parameter->isVariadic() |
| 361 | ? $type->getName() |
| 362 | : ''; |
| 363 | |
| 364 | if ($class !== Args::class && $class !== Io::class) { |
| 365 | $this->addGroup($parameter, $class); |
| 366 | } elseif (array_key_exists($class, $this->injected)) { |
| 367 | $short = $class === Args::class ? 'Args' : 'Io'; |
| 368 | |
| 369 | throw new ValueError("Command '{$this->full}' declares more than one {$short} parameter"); |
| 370 | } else { |
| 371 | $this->injected[$class] = $parameter->name; |
| 372 | } |
| 373 | } |
| 374 | |
| 375 | /** |
| 376 | * Adds the options of an option group: a class whose constructor |
| 377 | * parameters all carry `#[Opt]`. |
| 378 | */ |
| 379 | private function addGroup(ReflectionParameter $parameter, string $class): void |
| 380 | { |
| 381 | $constructor = class_exists($class) ? new ReflectionClass($class)->getConstructor() : null; |
| 382 | $members = $constructor?->getParameters() ?? []; |
| 383 | |
| 384 | if (!array_any( |
| 385 | $members, |
| 386 | static fn(ReflectionParameter $member): bool => $member->getAttributes(Opt::class) !== [], |
| 387 | )) { |
| 388 | throw new ValueError( |
| 389 | "Command '{$this->full}' parameter \${$parameter->name} must be declared as Args, Io, " |
| 390 | . 'or an option group, or carry #[Arg] or #[Opt]', |
| 391 | ); |
| 392 | } |
| 393 | |
| 394 | foreach ($members as $member) { |
| 395 | $opt = $member->getAttributes(Opt::class)[0] ?? throw new ValueError( |
| 396 | "Command '{$this->full}' option group {$class} parameter \${$member->name} must carry #[Opt]", |
| 397 | ); |
| 398 | |
| 399 | $this->addOption(new Option($member, $opt->newInstance(), $this->type($member), $parameter->name)); |
| 400 | } |
| 401 | |
| 402 | /** @var class-string $class Checked by class_exists() */ |
| 403 | $this->groups[$parameter->name] = $class; |
| 404 | } |
| 405 | |
| 406 | private function checkArguments(): void |
| 407 | { |
| 408 | $last = count($this->arguments) - 1; |
| 409 | |
| 410 | foreach ($this->arguments as $index => $argument) { |
| 411 | if ($argument->variadic() && $index < $last) { |
| 412 | throw new ValueError( |
| 413 | "Command '{$this->full}' declares an argument after the variadic '<{$argument->name}>'", |
| 414 | ); |
| 415 | } |
| 416 | } |
| 417 | } |
| 418 | |
| 419 | /** |
| 420 | * Parses the tokens, replacing declared short names with their long |
| 421 | * names. |
| 422 | * |
| 423 | * Also counts how often each name occurs and notes which occur bare, |
| 424 | * without a value, since Args merges the occurrences: two bare |
| 425 | * `--worker` must not pass for one value, nor `--host --host=x` for a |
| 426 | * valued one. Positionals are noted too, but only option names are |
| 427 | * looked up. |
| 428 | * |
| 429 | * @param list<string> $tokens |
| 430 | * @return array{Args, array<string, int>, array<string, true>} |
| 431 | */ |
| 432 | private function parse(array $tokens): array |
| 433 | { |
| 434 | $normalized = []; |
| 435 | $counts = []; |
| 436 | $bare = []; |
| 437 | $literal = false; |
| 438 | |
| 439 | foreach ($tokens as $token) { |
| 440 | // Aliasing stops at the `--` separator; Args reads every |
| 441 | // later token as a positional. The token is command-line |
| 442 | // input, not a secret. |
| 443 | // @mago-expect lint:no-insecure-comparison |
| 444 | if ($literal || $token === '--') { |
| 445 | $literal = true; |
| 446 | $normalized[] = $token; |
| 447 | |
| 448 | continue; |
| 449 | } |
| 450 | |
| 451 | $separator = strpos(haystack: $token, needle: '='); |
| 452 | $name = $separator === false |
| 453 | ? $token |
| 454 | : substr(string: $token, offset: 0, length: $separator); |
| 455 | $long = $this->aliases[$name] ?? null; |
| 456 | $key = $long ?? $name; |
| 457 | $counts[$key] = ($counts[$key] ?? 0) + 1; |
| 458 | |
| 459 | if ($separator === false) { |
| 460 | $bare[$key] = true; |
| 461 | } |
| 462 | |
| 463 | $normalized[] = $long === null |
| 464 | ? $token |
| 465 | : $long . ($separator === false ? '' : substr(string: $token, offset: $separator)); |
| 466 | } |
| 467 | |
| 468 | return [new Args($normalized), $counts, $bare]; |
| 469 | } |
| 470 | |
| 471 | /** |
| 472 | * @param list<string> $positionals |
| 473 | * @return array<string, mixed> |
| 474 | */ |
| 475 | private function bindArguments(array $positionals): array |
| 476 | { |
| 477 | $required = count(array_filter( |
| 478 | $this->arguments, |
| 479 | static fn(Argument $argument): bool => !$argument->optional(), |
| 480 | )); |
| 481 | $count = count($positionals); |
| 482 | |
| 483 | // PHP makes every parameter before a required one required, so the |
| 484 | // required arguments always lead. |
| 485 | if ($count < $required) { |
| 486 | throw new InvalidUsage("Missing required argument '<{$this->arguments[$count]->name}>'"); |
| 487 | } |
| 488 | |
| 489 | $values = []; |
| 490 | |
| 491 | foreach ($this->arguments as $index => $argument) { |
| 492 | if ($argument->variadic()) { |
| 493 | $rest = array_slice($positionals, $index); |
| 494 | |
| 495 | if ($rest !== []) { |
| 496 | $values[$argument->parameter->name] = $rest; |
| 497 | } |
| 498 | |
| 499 | return $values; |
| 500 | } |
| 501 | |
| 502 | if ($index < $count) { |
| 503 | $values[$argument->parameter->name] = $argument->convert($positionals[$index]); |
| 504 | } |
| 505 | } |
| 506 | |
| 507 | $surplus = $positionals[count($this->arguments)] ?? null; |
| 508 | |
| 509 | if ($surplus !== null) { |
| 510 | throw new InvalidUsage("Unexpected argument '{$surplus}'"); |
| 511 | } |
| 512 | |
| 513 | return $values; |
| 514 | } |
| 515 | |
| 516 | private function unknownOption(string $name): string |
| 517 | { |
| 518 | $negated = str_starts_with($name, '--no-') ? '--' . substr($name, offset: 5) : ''; |
| 519 | |
| 520 | if (array_key_exists($negated, $this->options)) { |
| 521 | return "Option '{$negated}' cannot be negated"; |
| 522 | } |
| 523 | |
| 524 | $message = "Unknown option '{$name}'"; |
| 525 | |
| 526 | // PHP turns a numeric short name like '-1' into an integer key. |
| 527 | $shorts = array_map(strval(...), array_keys($this->aliases)); |
| 528 | $candidates = [...array_keys($this->options), ...array_keys($this->negations), ...$shorts]; |
| 529 | |
| 530 | // The runner answers these unless the command declares `--help`. |
| 531 | if (!array_key_exists('--help', $this->options)) { |
| 532 | array_push($candidates, '--help', '-h'); |
| 533 | } |
| 534 | |
| 535 | $best = Suggestion::find($name, $candidates, ignore: '-'); |
| 536 | |
| 537 | return $best === null ? $message : "{$message}. Did you mean '{$best}'?"; |
| 538 | } |
| 539 | } |