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<?php |
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declare(strict_types=1); |
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namespace Yiisoft\VarDumper; |
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use Closure; |
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use ReflectionException; |
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use ReflectionFunction; |
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use function array_key_exists; |
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use function array_slice; |
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use function in_array; |
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use function is_array; |
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/** |
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* ClosureExporter exports PHP {@see \Closure} as a string containing PHP code. |
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* |
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* The string is a valid PHP expression that can be evaluated by PHP parser |
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* and the evaluation result will give back the closure instance. |
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*/ |
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final class ClosureExporter |
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{ |
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private UseStatementParser $useStatementParser; |
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1 |
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public function __construct() |
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{ |
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1 |
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$this->useStatementParser = new UseStatementParser(); |
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1 |
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} |
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/** |
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* Export closure as a string containing PHP code. |
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* |
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* @param Closure $closure Closure to export. |
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* |
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* @throws ReflectionException |
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* |
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* @return string String containing PHP code. |
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*/ |
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public function export(Closure $closure): string |
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{ |
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$reflection = new ReflectionFunction($closure); |
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$fileName = $reflection->getFileName(); |
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$start = $reflection->getStartLine(); |
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$end = $reflection->getEndLine(); |
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if ($fileName === false || $start === false || $end === false || ($fileContent = file($fileName)) === false) { |
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return 'function() {/* Error: unable to determine Closure source */}'; |
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} |
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--$start; |
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$uses = $this->useStatementParser->fromFile($fileName); |
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$source = implode('', array_slice($fileContent, $start, $end - $start)); |
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$tokens = token_get_all('<?php ' . $source); |
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array_shift($tokens); |
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$closureTokens = []; |
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$pendingParenthesisCount = 0; |
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$isShortClosure = false; |
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$buffer = ''; |
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foreach ($tokens as $token) { |
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if (!isset($token[0])) { |
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continue; |
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} |
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if (in_array($token[0], [T_FUNCTION, T_FN, T_STATIC], true)) { |
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$closureTokens[] = $token[1]; |
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if (!$isShortClosure && $token[0] === T_FN) { |
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$isShortClosure = true; |
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} |
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continue; |
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} |
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if ($closureTokens !== []) { |
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$readableToken = $token[1] ?? $token; |
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if ($this->isNextTokenIsPartOfNamespace($token)) { |
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$buffer .= $token[1]; |
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// HERE we need to match partially because now NS can be a single token in PHP 8 |
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if (array_key_exists($buffer, $uses) && !$this->isNextTokenIsPartOfNamespace(next($tokens))) { |
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$readableToken = $uses[$buffer]; |
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$buffer = ''; |
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} |
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} |
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if ($token === '{' || $token === '[') { |
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$pendingParenthesisCount++; |
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} elseif ($token === '}' || $token === ']') { |
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if ($pendingParenthesisCount === 0) { |
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break; |
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} |
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$pendingParenthesisCount--; |
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} elseif ($token === ',' || $token === ';') { |
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if ($pendingParenthesisCount === 0) { |
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break; |
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} |
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} |
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$closureTokens[] = $readableToken; |
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} |
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} |
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return implode('', $closureTokens); |
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} |
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private function isNextTokenIsPartOfNamespace($token): bool |
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{ |
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if (!is_array($token)) { |
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return false; |
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} |
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if ($token[0] === T_STRING || $token[0] === T_NS_SEPARATOR || $token[0] === T_NAME_QUALIFIED || $token[0] === T_NAME_FULLY_QUALIFIED) { |
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return true; |
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} |
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if (version_compare(PHP_VERSION, '8.0.0', '>=')) { |
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return $token[0] === T_NAME_RELATIVE; |
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} |
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return false; |
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} |
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} |
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yiisoft /
var-dumper
