56 lines
1.6 KiB
PHP
56 lines
1.6 KiB
PHP
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<?php declare(strict_types=1);
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namespace PhpParser\Parser;
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use PhpParser\Error;
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use PhpParser\ErrorHandler;
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use PhpParser\Parser;
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class Multiple implements Parser
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{
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/** @var Parser[] List of parsers to try, in order of preference */
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private $parsers;
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/**
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* Create a parser which will try multiple parsers in an order of preference.
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*
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* Parsers will be invoked in the order they're provided to the constructor. If one of the
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* parsers runs without throwing, it's output is returned. Otherwise the exception that the
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* first parser generated is thrown.
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*
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* @param Parser[] $parsers
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*/
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public function __construct(array $parsers) {
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$this->parsers = $parsers;
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}
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public function parse(string $code, ErrorHandler $errorHandler = null) {
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if (null === $errorHandler) {
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$errorHandler = new ErrorHandler\Throwing;
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}
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list($firstStmts, $firstError) = $this->tryParse($this->parsers[0], $errorHandler, $code);
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if ($firstError === null) {
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return $firstStmts;
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}
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for ($i = 1, $c = count($this->parsers); $i < $c; ++$i) {
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list($stmts, $error) = $this->tryParse($this->parsers[$i], $errorHandler, $code);
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if ($error === null) {
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return $stmts;
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}
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}
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throw $firstError;
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}
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private function tryParse(Parser $parser, ErrorHandler $errorHandler, $code) {
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$stmts = null;
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$error = null;
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try {
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$stmts = $parser->parse($code, $errorHandler);
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} catch (Error $error) {}
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return [$stmts, $error];
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}
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}
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