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<?php declare(strict_types=1);
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/*
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 * This file is part of sebastian/lines-of-code.
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 *
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 * (c) Sebastian Bergmann <sebastian@phpunit.de>
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 *
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 * For the full copyright and license information, please view the LICENSE
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 * file that was distributed with this source code.
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 */
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namespace SebastianBergmann\LinesOfCode;
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use function substr_count;
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use PhpParser\Error;
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use PhpParser\Lexer;
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use PhpParser\Node;
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use PhpParser\NodeTraverser;
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use PhpParser\Parser;
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use PhpParser\ParserFactory;
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final class Counter
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{
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    /**
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     * @throws RuntimeException
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     */
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    public function countInSourceFile(string $sourceFile): LinesOfCode
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    {
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        return $this->countInSourceString(file_get_contents($sourceFile));
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    }
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    /**
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     * @throws RuntimeException
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     */
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    public function countInSourceString(string $source): LinesOfCode
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    {
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        $linesOfCode = substr_count($source, "\n");
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        if ($linesOfCode === 0 && !empty($source)) {
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            $linesOfCode = 1;
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        }
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        try {
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            $nodes = $this->parser()->parse($source);
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            assert($nodes !== null);
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            return $this->countInAbstractSyntaxTree($linesOfCode, $nodes);
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            // @codeCoverageIgnoreStart
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        } catch (Error $error) {
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            throw new RuntimeException(
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                $error->getMessage(),
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                (int) $error->getCode(),
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                $error
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            );
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        }
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        // @codeCoverageIgnoreEnd
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    }
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    /**
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     * @param Node[] $nodes
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     *
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     * @throws RuntimeException
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     */
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    public function countInAbstractSyntaxTree(int $linesOfCode, array $nodes): LinesOfCode
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    {
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        $traverser = new NodeTraverser;
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        $visitor   = new LineCountingVisitor($linesOfCode);
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        $traverser->addVisitor($visitor);
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        try {
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            /* @noinspection UnusedFunctionResultInspection */
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            $traverser->traverse($nodes);
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            // @codeCoverageIgnoreStart
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        } catch (Error $error) {
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            throw new RuntimeException(
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                $error->getMessage(),
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                (int) $error->getCode(),
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                $error
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            );
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        }
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        // @codeCoverageIgnoreEnd
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        return $visitor->result();
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    }
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    private function parser(): Parser
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    {
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        return (new ParserFactory)->create(ParserFactory::PREFER_PHP7, new Lexer);
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    }
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}