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| 1 | <?php |
| 2 | declare(strict_types=1); |
| 3 | /** |
| 4 | * Pop PHP Framework (https://www.popphp.org/) |
| 5 | * |
| 6 | * @link https://github.com/popphp/popphp-framework |
| 7 | * @author Nick Sagona, III <nick@popphp.org> |
| 8 | * @copyright Copyright (c) 2009-2026 Nick Sagona, III |
| 9 | * @license https://www.popphp.org/license New BSD License |
| 10 | */ |
| 11 | |
| 12 | /** |
| 13 | * @namespace |
| 14 | */ |
| 15 | namespace Pop\View\Template; |
| 16 | |
| 17 | /** |
| 18 | * View stream template class |
| 19 | * |
| 20 | * @category Pop |
| 21 | * @package Pop\View |
| 22 | * @author Nick Sagona, III <nick@popphp.org> |
| 23 | * @copyright Copyright (c) 2009-2026 Nick Sagona, III |
| 24 | * @license https://www.popphp.org/license New BSD License |
| 25 | * @version 5.0.0 |
| 26 | */ |
| 27 | class Stream extends AbstractTemplate |
| 28 | { |
| 29 | |
| 30 | /** |
| 31 | * View template file |
| 32 | * @var ?string |
| 33 | */ |
| 34 | protected ?string $file = null; |
| 35 | |
| 36 | /** |
| 37 | * View parent template |
| 38 | * @var ?Stream |
| 39 | */ |
| 40 | protected ?Stream $parent = null; |
| 41 | |
| 42 | /** |
| 43 | * Block templates |
| 44 | * @var array |
| 45 | */ |
| 46 | protected array $blocks = []; |
| 47 | |
| 48 | /** |
| 49 | * Master template |
| 50 | * @var ?string |
| 51 | */ |
| 52 | protected ?string $master = null; |
| 53 | |
| 54 | /** |
| 55 | * Master block templates |
| 56 | * @var array |
| 57 | */ |
| 58 | protected array $masterBlocks = []; |
| 59 | |
| 60 | /** |
| 61 | * Cache directory for compiled templates |
| 62 | * @var ?string |
| 63 | */ |
| 64 | protected ?string $cacheDir = null; |
| 65 | |
| 66 | /** |
| 67 | * Files that contributed to the resolved template (path => mtime), |
| 68 | * across the full @extends/@include chain |
| 69 | * @var array |
| 70 | */ |
| 71 | protected array $contributingFiles = []; |
| 72 | |
| 73 | /** |
| 74 | * Constructor |
| 75 | * |
| 76 | * Instantiate the view stream template object |
| 77 | * |
| 78 | * @param string $template |
| 79 | * @param ?string $cacheDir |
| 80 | */ |
| 81 | public function __construct(string $template, ?string $cacheDir = null) |
| 82 | { |
| 83 | if ($cacheDir !== null) { |
| 84 | $this->setCacheDir($cacheDir); |
| 85 | } |
| 86 | |
| 87 | $this->setTemplate($template); |
| 88 | |
| 89 | // Parse parent template |
| 90 | $this->parseParent(); |
| 91 | |
| 92 | // Parse includes |
| 93 | $this->parseIncludes(); |
| 94 | |
| 95 | // Parse blocks |
| 96 | $this->parseBlocks(); |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * Set view template with auto-detect |
| 101 | * |
| 102 | * @param string $template |
| 103 | * @return static |
| 104 | */ |
| 105 | public function setTemplate(string $template): static |
| 106 | { |
| 107 | if ((strlen($template) <= 255) && file_exists($template)) { |
| 108 | $this->template = file_get_contents($template); |
| 109 | $this->file = $template; |
| 110 | $this->contributingFiles[$template] = filemtime($template); |
| 111 | } else { |
| 112 | $this->template = $template; |
| 113 | } |
| 114 | return $this; |
| 115 | } |
| 116 | |
| 117 | /** |
| 118 | * Set master |
| 119 | * |
| 120 | * @param string $master |
| 121 | * @return static |
| 122 | */ |
| 123 | public function setMaster(string $master): static |
| 124 | { |
| 125 | $this->master = $master; |
| 126 | return $this; |
| 127 | } |
| 128 | |
| 129 | /** |
| 130 | * Get blocks |
| 131 | * |
| 132 | * @return array |
| 133 | */ |
| 134 | public function getBlocks(): array |
| 135 | { |
| 136 | return $this->blocks; |
| 137 | } |
| 138 | |
| 139 | /** |
| 140 | * Get block by name |
| 141 | * |
| 142 | * @param string $name |
| 143 | * @return string|null |
| 144 | */ |
| 145 | public function getBlock(string $name): string|null |
| 146 | { |
| 147 | return $this->blocks[$name] ?? null; |
| 148 | } |
| 149 | |
| 150 | /** |
| 151 | * Get master blocks |
| 152 | * |
| 153 | * @return array |
| 154 | */ |
| 155 | public function getMasterBlocks(): array |
| 156 | { |
| 157 | return $this->masterBlocks; |
| 158 | } |
| 159 | |
| 160 | /** |
| 161 | * Get master block by name |
| 162 | * |
| 163 | * @param string $name |
| 164 | * @return string|null |
| 165 | */ |
| 166 | public function getMasterBlock(string $name): string|null |
| 167 | { |
| 168 | return $this->masterBlocks[$name] ?? null; |
| 169 | } |
| 170 | |
| 171 | /** |
| 172 | * Set blocks |
| 173 | * |
| 174 | * @param array $blocks |
| 175 | * @return static |
| 176 | */ |
| 177 | public function setBlocks(array $blocks): static |
| 178 | { |
| 179 | $this->blocks = $blocks; |
| 180 | return $this; |
| 181 | } |
| 182 | |
| 183 | /** |
| 184 | * Set block |
| 185 | * |
| 186 | * @param string $name |
| 187 | * @param string $value |
| 188 | * @return static |
| 189 | */ |
| 190 | public function setBlock($name, $value): static |
| 191 | { |
| 192 | $this->blocks[$name] = $value; |
| 193 | return $this; |
| 194 | } |
| 195 | |
| 196 | /** |
| 197 | * Set master blocks |
| 198 | * |
| 199 | * @param array $blocks |
| 200 | * @return static |
| 201 | */ |
| 202 | public function setMasterBlocks(array $blocks): static |
| 203 | { |
| 204 | $this->masterBlocks = $blocks; |
| 205 | return $this; |
| 206 | } |
| 207 | |
| 208 | /** |
| 209 | * Set master block |
| 210 | * |
| 211 | * @param string $name |
| 212 | * @param string $value |
| 213 | * @return static |
| 214 | */ |
| 215 | public function setMasterBlock(string $name, string $value): static |
| 216 | { |
| 217 | $this->masterBlocks[$name] = $value; |
| 218 | return $this; |
| 219 | } |
| 220 | |
| 221 | /** |
| 222 | * Get parent |
| 223 | * |
| 224 | * @return self|null |
| 225 | */ |
| 226 | public function getParent(): self|null |
| 227 | { |
| 228 | return $this->parent; |
| 229 | } |
| 230 | |
| 231 | /** |
| 232 | * Get master |
| 233 | * |
| 234 | * @return string |
| 235 | */ |
| 236 | public function getMaster(): string |
| 237 | { |
| 238 | return $this->master; |
| 239 | } |
| 240 | |
| 241 | /** |
| 242 | * Determine if the template stream is from a file |
| 243 | * |
| 244 | * @return bool |
| 245 | */ |
| 246 | public function isFile(): bool |
| 247 | { |
| 248 | return ($this->file !== null); |
| 249 | } |
| 250 | |
| 251 | /** |
| 252 | * Determine if the template stream is from a string |
| 253 | * |
| 254 | * @return bool |
| 255 | */ |
| 256 | public function isString(): bool |
| 257 | { |
| 258 | return ($this->file === null); |
| 259 | } |
| 260 | |
| 261 | /** |
| 262 | * Set cache directory for compiled templates |
| 263 | * |
| 264 | * @param string $dir |
| 265 | * @return static |
| 266 | */ |
| 267 | public function setCacheDir(string $dir): static |
| 268 | { |
| 269 | $this->cacheDir = $dir; |
| 270 | return $this; |
| 271 | } |
| 272 | |
| 273 | /** |
| 274 | * Get cache directory |
| 275 | * |
| 276 | * @return ?string |
| 277 | */ |
| 278 | public function getCacheDir(): ?string |
| 279 | { |
| 280 | return $this->cacheDir; |
| 281 | } |
| 282 | |
| 283 | /** |
| 284 | * Has a cache directory been configured |
| 285 | * |
| 286 | * @return bool |
| 287 | */ |
| 288 | public function hasCacheDir(): bool |
| 289 | { |
| 290 | return ($this->cacheDir !== null); |
| 291 | } |
| 292 | |
| 293 | /** |
| 294 | * Get files (path => mtime) that contributed to the resolved template |
| 295 | * |
| 296 | * @return array |
| 297 | */ |
| 298 | public function getContributingFiles(): array |
| 299 | { |
| 300 | return $this->contributingFiles; |
| 301 | } |
| 302 | |
| 303 | /** |
| 304 | * Render the view and return the output |
| 305 | * |
| 306 | * @param ?array $data |
| 307 | * @return string |
| 308 | */ |
| 309 | public function render(?array $data = null): string |
| 310 | { |
| 311 | if ($data !== null) { |
| 312 | $this->data = $data; |
| 313 | } |
| 314 | |
| 315 | if ($this->hasCacheDir()) { |
| 316 | $this->renderCompiled(); |
| 317 | } else { |
| 318 | $this->renderTemplate(); |
| 319 | } |
| 320 | |
| 321 | return $this->output; |
| 322 | } |
| 323 | |
| 324 | /** |
| 325 | * Parse template parent/child blocks |
| 326 | * |
| 327 | * @return void |
| 328 | */ |
| 329 | protected function parseParent(): void |
| 330 | { |
| 331 | $matches = []; |
| 332 | preg_match_all('/\{\{\@extends(.*?)\}\}/s', $this->template, $matches); |
| 333 | |
| 334 | if (isset($matches[0][0])) { |
| 335 | foreach ($matches[0] as $key => $match) { |
| 336 | $tmpl = trim($matches[1][$key]); |
| 337 | self::assertSafeTemplatePath($tmpl); |
| 338 | if ($tmpl != $this->file) { |
| 339 | $dir = ($this->isFile()) ? dirname($this->file) . DIRECTORY_SEPARATOR : null; |
| 340 | $this->template = str_replace($match, '', $this->template); |
| 341 | $this->parent = new Stream($dir . $tmpl); |
| 342 | $this->contributingFiles = array_merge($this->contributingFiles, $this->parent->getContributingFiles()); |
| 343 | } |
| 344 | } |
| 345 | } |
| 346 | } |
| 347 | |
| 348 | /** |
| 349 | * Parse template includes |
| 350 | * |
| 351 | * @return void |
| 352 | */ |
| 353 | protected function parseIncludes(): void |
| 354 | { |
| 355 | $matches = []; |
| 356 | preg_match_all('/\{\{\@include(.*?)\}\}/s', $this->template, $matches); |
| 357 | |
| 358 | if (isset($matches[0][0])) { |
| 359 | foreach ($matches[0] as $key => $match) { |
| 360 | $tmpl = trim($matches[1][$key]); |
| 361 | self::assertSafeTemplatePath($tmpl); |
| 362 | if ($tmpl != $this->file) { |
| 363 | $dir = ($this->isFile()) ? dirname($this->file) . DIRECTORY_SEPARATOR : null; |
| 364 | $view = new Stream($dir . $tmpl); |
| 365 | $this->template = str_replace($match, $view->getTemplate(), $this->template); |
| 366 | $this->contributingFiles = array_merge($this->contributingFiles, $view->getContributingFiles()); |
| 367 | } |
| 368 | } |
| 369 | } |
| 370 | } |
| 371 | |
| 372 | /** |
| 373 | * Guard against path traversal / absolute-path escapes in @extends/@include targets |
| 374 | * |
| 375 | * @param string $tmpl |
| 376 | * @throws Stream\Exception |
| 377 | * @return void |
| 378 | */ |
| 379 | protected static function assertSafeTemplatePath(string $tmpl): void |
| 380 | { |
| 381 | if ((str_starts_with($tmpl, '/')) || (str_starts_with($tmpl, '\\')) || |
| 382 | (preg_match('/^[a-zA-Z]:[\/\\\\]/', $tmpl)) || |
| 383 | (preg_match('/(^|[\/\\\\])\.\.($|[\/\\\\])/', $tmpl))) { |
| 384 | throw new Stream\Exception( |
| 385 | "Error: The @extends/@include template path '" . $tmpl . "' is not allowed " . |
| 386 | "(absolute paths and '..' segments are not permitted)." |
| 387 | ); |
| 388 | } |
| 389 | } |
| 390 | |
| 391 | /** |
| 392 | * Parse template parent/child blocks |
| 393 | * |
| 394 | * @return void |
| 395 | */ |
| 396 | protected function parseBlocks(): void |
| 397 | { |
| 398 | $matches = []; |
| 399 | preg_match_all('/\{\{(.*?)\{\{\/(.*?)\}\}/s', $this->template, $matches); |
| 400 | |
| 401 | if (isset($matches[0][0])) { |
| 402 | foreach ($matches[0] as $match) { |
| 403 | $name = substr($match, 2); |
| 404 | $name = substr($name, 0, strpos($name, '}}')); |
| 405 | $content = substr($match, (strpos($match, '}}') + 2)); |
| 406 | $content = substr($content, 0, strpos($content, '{{/')); |
| 407 | $this->blocks[$name] = $content; |
| 408 | } |
| 409 | } |
| 410 | |
| 411 | $parent = $this->parent; |
| 412 | |
| 413 | if ($parent === null) { |
| 414 | $this->setMaster($this->template); |
| 415 | $this->setMasterBlocks($this->blocks); |
| 416 | } |
| 417 | |
| 418 | while ($parent !== null) { |
| 419 | $this->setMaster($parent->getMaster()); |
| 420 | $this->setMasterBlocks($parent->getMasterBlocks()); |
| 421 | |
| 422 | foreach ($this->blocks as $block => $tmpl) { |
| 423 | $this->setBlock($block, str_replace('{{parent}}', $parent->getBlock($block), $tmpl)); |
| 424 | } |
| 425 | |
| 426 | $parent = $parent->getParent(); |
| 427 | } |
| 428 | |
| 429 | $this->template = $this->master; |
| 430 | foreach ($this->blocks as $block => $tmpl) { |
| 431 | $this->template = str_replace( |
| 432 | '{{' . $block . '}}' . $this->getMasterBlock($block) . '{{/' . $block . '}}', |
| 433 | $tmpl, |
| 434 | $this->template |
| 435 | ); |
| 436 | } |
| 437 | } |
| 438 | |
| 439 | /** |
| 440 | * Render view template string |
| 441 | * |
| 442 | * @return void |
| 443 | */ |
| 444 | protected function renderTemplate(): void |
| 445 | { |
| 446 | $this->output = $this->template; |
| 447 | |
| 448 | // Parse array values |
| 449 | $this->output = Stream\Parser::parseArrays($this->template, $this->data, $this->output); |
| 450 | |
| 451 | // Parse conditionals |
| 452 | $this->output = Stream\Parser::parseConditionals($this->template, $this->data, $this->output); |
| 453 | |
| 454 | // Parse scalar values |
| 455 | $this->output = Stream\Parser::parseScalars($this->data, $this->output); |
| 456 | } |
| 457 | |
| 458 | /** |
| 459 | * Render the view template string via the compiled/cached path |
| 460 | * |
| 461 | * @return void |
| 462 | */ |
| 463 | protected function renderCompiled(): void |
| 464 | { |
| 465 | $cache = new Stream\Cache($this->cacheDir); |
| 466 | $key = Stream\Cache::key($this->template); |
| 467 | |
| 468 | $newestMtime = empty($this->contributingFiles) ? 0 : max($this->contributingFiles); |
| 469 | |
| 470 | $source = $cache->get($key, $newestMtime); |
| 471 | if ($source === null) { |
| 472 | $source = Stream\Compiler::compile($this->template); |
| 473 | $cache->put($key, $source); |
| 474 | } |
| 475 | |
| 476 | $data = $this->data; |
| 477 | |
| 478 | try { |
| 479 | ob_start(); |
| 480 | include $cache->path($key); |
| 481 | $this->output = ob_get_clean(); |
| 482 | } catch (\Throwable $e) { |
| 483 | // ob_end_clean() (not ob_clean()) is required here: ob_clean() only empties the buffer's |
| 484 | // contents but leaves it on PHP's output-buffer stack, so a caller that catches this |
| 485 | // exception and continues execution is left with a dangling output buffer that silently |
| 486 | // swallows subsequent unrelated output (ob_get_level() grows unboundedly across repeated |
| 487 | // catches). Compiled loop bodies (Phase 2) are the first thing on this path that can throw |
| 488 | // at runtime (the ArrayAccess/ArrayObject guards), making this reachable for the first time. |
| 489 | ob_end_clean(); |
| 490 | throw $e; |
| 491 | } |
| 492 | } |
| 493 | |
| 494 | } |