smuuf/primi

<?php

declare(strict_types=1);

namespace Smuuf\Primi\Ex;

use \Smuuf\Primi\Location;
use \Smuuf\Primi\Code\Source;
use \Smuuf\Primi\Helpers\StringEscaping;

class SyntaxError extends ErrorException {

    public function __construct(
        Location $location,
        ?string $excerpt = \null,
        ?string $reason = \null
    ) {

        $sanitizedExcerpt = $excerpt
            ? StringEscaping::escapeString($excerpt, '"')
            : false;

        $msg = \sprintf(
            "Syntax error%s%s",
            $reason
                ? \sprintf(" (%s)", \trim($reason))
                : '',
            $sanitizedExcerpt
                ? \sprintf(" near \"%s\"", \trim($sanitizedExcerpt))
                : ''
        );

        parent::__construct($msg, $location);

    }

    public static function fromInternal(
        InternalSyntaxError $e,
        Source $source
    ): SyntaxError {

        // Show a bit of code where the syntax error occurred.
        // And don't ever have negative start index (that would take characters
        // indexed from the end).
        $excerpt = \mb_substr(
            $source->getSourceCode(),
            max($e->getErrorPos() - 5, 0),
            10
        );

        return new SyntaxError(
            new Location(
                $source->getSourceId(),
                $e->getErrorLine(),
                $e->getLinePos()
            ),
            $excerpt,
            $e->getReason()
        );

    }

}