Counter.php

<?php

declare (strict_types=1);

/*
 * This file is part of sebastian/lines-of-code.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace SebastianBergmann\LinesOfCode;

use function assert;
use function file_get_contents;
use function substr_count;
use PhpParser\Error;
use PhpParser\Node;
use PhpParser\NodeTraverser;
use PhpParser\ParserFactory;
final class Counter {
    
    /**
     * @throws RuntimeException
     */
    public function countInSourceFile(string $sourceFile) : LinesOfCode {
        return $this->countInSourceString(file_get_contents($sourceFile));
    }
    
    /**
     * @throws RuntimeException
     */
    public function countInSourceString(string $source) : LinesOfCode {
        $linesOfCode = substr_count($source, "\n");
        if ($linesOfCode === 0 && !empty($source)) {
            $linesOfCode = 1;
        }
        assert($linesOfCode >= 0);
        try {
            $nodes = (new ParserFactory())->createForHostVersion()
                ->parse($source);
            assert($nodes !== null);
            return $this->countInAbstractSyntaxTree($linesOfCode, $nodes);
            // @codeCoverageIgnoreStart
        } catch (Error $error) {
            throw new RuntimeException($error->getMessage(), $error->getCode(), $error);
        }
        // @codeCoverageIgnoreEnd
    }
    
    /**
     * @psalm-param non-negative-int $linesOfCode
     *
     * @param Node[] $nodes
     *
     * @throws RuntimeException
     */
    public function countInAbstractSyntaxTree(int $linesOfCode, array $nodes) : LinesOfCode {
        $traverser = new NodeTraverser();
        $visitor = new LineCountingVisitor($linesOfCode);
        $traverser->addVisitor($visitor);
        try {
            
            /* @noinspection UnusedFunctionResultInspection */
            $traverser->traverse($nodes);
            // @codeCoverageIgnoreStart
        } catch (Error $error) {
            throw new RuntimeException($error->getMessage(), $error->getCode(), $error);
        }
        // @codeCoverageIgnoreEnd
        return $visitor->result();
    }

}