<?php
/**
 * PHPCompatibility, an external standard for PHP_CodeSniffer.
 *
 * @package   PHPCompatibility
 * @copyright 2012-2019 PHPCompatibility Contributors
 * @license   https://opensource.org/licenses/LGPL-3.0 LGPL3
 * @link      https://github.com/PHPCompatibility/PHPCompatibility
 */

namespace PHPCompatibility\Sniffs\Classes;

use PHPCompatibility\Sniff;
use PHP_CodeSniffer_File as File;
use PHP_CodeSniffer_Tokens as Tokens;

/**
 * Typed class property declarations are available since PHP 7.4.
 *
 * PHP version 7.4
 *
 * @link https://www.php.net/manual/en/migration74.new-features.php#migration74.new-features.core.typed-properties
 * @link https://wiki.php.net/rfc/typed_properties_v2
 *
 * @since 9.2.0
 */
class NewTypedPropertiesSniff extends Sniff
{

    /**
     * Valid property modifier keywords.
     *
     * @since 9.2.0
     *
     * @var array
     */
    private $modifierKeywords = array(
        \T_PRIVATE   => \T_PRIVATE,
        \T_PROTECTED => \T_PROTECTED,
        \T_PUBLIC    => \T_PUBLIC,
        \T_STATIC    => \T_STATIC,
        \T_VAR       => \T_VAR,
    );


    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @since 9.2.0
     *
     * @return array
     */
    public function register()
    {
        return array(\T_VARIABLE);
    }

    /**
     * Processes this test, when one of its tokens is encountered.
     *
     * @since 9.2.0
     *
     * @param \PHP_CodeSniffer_File $phpcsFile The file being scanned.
     * @param int                   $stackPtr  The position of the current token in the
     *                                         stack passed in $tokens.
     *
     * @return int|void Integer stack pointer to skip forward or void to continue
     *                  normal file processing.
     */
    public function process(File $phpcsFile, $stackPtr)
    {
        if ($this->isClassProperty($phpcsFile, $stackPtr) === false) {
            return;
        }

        $find  = $this->modifierKeywords;
        $find += array(
            \T_SEMICOLON          => \T_SEMICOLON,
            \T_OPEN_CURLY_BRACKET => \T_OPEN_CURLY_BRACKET,
        );

        $tokens   = $phpcsFile->getTokens();
        $modifier = $phpcsFile->findPrevious($find, ($stackPtr - 1));
        if ($modifier === false
            || $tokens[$modifier]['code'] === \T_SEMICOLON
            || $tokens[$modifier]['code'] === \T_OPEN_CURLY_BRACKET
        ) {
            // Parse error. Ignore.
            return;
        }

        $type = $phpcsFile->findNext(Tokens::$emptyTokens, ($modifier + 1), null, true);
        if ($tokens[$type]['code'] === \T_VARIABLE) {
            return;
        }

        // Still here ? In that case, this will be a typed property.
        if ($this->supportsBelow('7.3') === true) {
            $phpcsFile->addError(
                'Typed properties are not supported in PHP 7.3 or earlier',
                $type,
                'Found'
            );
        }

        if ($this->supportsAbove('7.4') === true) {
            // Examine the type to verify it's valid.
            if ($tokens[$type]['type'] === 'T_NULLABLE'
                // Needed to support PHPCS < 3.5.0 which doesn't correct to the nullable token type yet.
                || $tokens[$type]['code'] === \T_INLINE_THEN
            ) {
                $type = $phpcsFile->findNext(Tokens::$emptyTokens, ($type + 1), null, true);
            }

            $content = $tokens[$type]['content'];
            if ($content === 'void' || $content === 'callable') {
                $phpcsFile->addError(
                    '%s is not supported as a type declaration for properties',
                    $type,
                    'InvalidType',
                    array($content)
                );
            }
        }

        $endOfStatement = $phpcsFile->findNext(\T_SEMICOLON, ($stackPtr + 1));
        if ($endOfStatement !== false) {
            // Don't throw the same error multiple times for multi-property declarations.
            return ($endOfStatement + 1);
        }
    }
}