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Edit File: EnumKeywordParser.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\Info\SchemaInfo;
use Opis\JsonSchema\{Keyword, Helper};
use Opis\JsonSchema\Keywords\{EnumDataKeyword, EnumKeyword};
use Opis\JsonSchema\Parsers\{
    KeywordParser, DataKeywordTrait, SchemaParser
};

class EnumKeywordParser extends KeywordParser
{
    use DataKeywordTrait;

/**
     * @inheritDoc
     */
    public function type(): string
    {
        return self::TYPE_BEFORE;
    }

/**
     * @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 ($this->isDataKeywordAllowed($parser, $this->keyword)) {
            if ($pointer = $this->getDataKeywordPointer($value)) {
                return new EnumDataKeyword($pointer);
            }
        }

if (!is_array($value) || !$value) {
            throw $this->keywordException("{keyword} must be a non-empty array", $info);
        }

$hasConst = property_exists($schema, 'const');
        $constMatched = false;

$allowedTypes = isset($shared->types) ? $shared->types : null;
        $foundTypes = [];
        $list = [];
        foreach ($value as $item) {
            $type = Helper::getJsonType($item);
            if ($type === null) {
                throw $this->keywordException("{keyword} contains invalid json data type", $info);
            }

if ($allowedTypes && !Helper::jsonTypeMatches($type, $allowedTypes)) {
                continue;
            }

if ($hasConst && Helper::equals($item, $schema->const)) {
                $constMatched = true;
                break;
            }

if (!in_array($type, $foundTypes)) {
                $foundTypes[] = $type;
            }

$list[] = $item;
        }

if ($hasConst) {
            if ($constMatched) {
                return null;
            }
            throw $this->keywordException("{keyword} does not contain the value of const keyword", $info);
        }

if ($foundTypes) {
            if ($allowedTypes === null) {
                $shared->types = $foundTypes;
            } else {
                $shared->types = array_unique(array_merge($shared->types, $foundTypes));
            }
        }

return new EnumKeyword($list);
    }
}