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Edit File: OneOfKeywordParser.php

<?php
/* ============================================================================
 * Copyright 2020 Zindex Software
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ============================================================================ */

namespace Opis\JsonSchema\Parsers\Keywords;

use Opis\JsonSchema\Keyword;
use Opis\JsonSchema\Info\SchemaInfo;
use Opis\JsonSchema\Keywords\OneOfKeyword;
use Opis\JsonSchema\Parsers\{KeywordParser, SchemaParser};

class OneOfKeywordParser extends KeywordParser
{
    /**
     * @inheritDoc
     */
    public function type(): string
    {
        return self::TYPE_AFTER;
    }

/**
     * @inheritDoc
     */
    public function parse(SchemaInfo $info, SchemaParser $parser, object $shared): ?Keyword
    {
        $schema = $info->data();

if (!$this->keywordExists($schema)) {
            return null;
        }

$value = $this->keywordValue($schema);

if (!is_array($value)) {
            throw $this->keywordException("{keyword} should be an array of json schemas", $info);
        }

if (!$value) {
            throw $this->keywordException("{keyword} must have at least one element", $info);
        }

$valid = 0;

foreach ($value as $index => $item) {
            if ($item === false) {
                continue;
            }
            if ($item === true) {
                if (++$valid > 1) {
                    throw $this->keywordException("{keyword} contains multiple true values", $info);
                }
                continue;
            }
            if (!is_object($item)) {
                throw $this->keywordException("{keyword}[{$index}] must be a json schema", $info);
            } elseif (!count(get_object_vars($item))) {
                if (++$valid > 1) {
                    throw $this->keywordException("{keyword} contains multiple true values", $info);
                }
            }
        }

return new OneOfKeyword($value);
    }
}