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Editing: Draft.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;

abstract class Draft extends Vocabulary
{
    /**
     * @param Vocabulary|null $extraVocabulary
     */
    public function __construct(?Vocabulary $extraVocabulary = null)
    {
        $keywords = $this->getKeywordParsers();
        $keywordValidators = $this->getKeywordValidatorParsers();
        $pragmas = $this->getPragmaParsers();

if ($extraVocabulary) {
            $keywords = array_merge($keywords, $extraVocabulary->keywords());
            $keywordValidators = array_merge($keywordValidators, $extraVocabulary->keywordValidators());
            $pragmas = array_merge($pragmas, $extraVocabulary->pragmas());
        }

array_unshift($keywords, $this->getRefKeywordParser());

parent::__construct($keywords, $keywordValidators, $pragmas);
    }

/**
     * @return string
     */
    abstract public function version(): string;

/**
     * @return bool
     */
    abstract public function allowKeywordsAlongsideRef(): bool;

/**
     * @return bool
     */
    abstract public function supportsAnchorId(): bool;

/**
     * @return KeywordParser
     */
    abstract protected function getRefKeywordParser(): KeywordParser;

/**
     * @return KeywordParser[]
     */
    abstract protected function getKeywordParsers(): array;

/**
     * @return KeywordValidatorParser[]
     */
    protected function getKeywordValidatorParsers(): array
    {
        return [];
    }

/**
     * @return PragmaParser[]
     */
    protected function getPragmaParsers(): array
    {
        return [];
    }
}

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