<?php

namespace Opis\JsonSchema\Parsers;

use Opis\JsonSchema\Exceptions\InvalidPragmaException;
use Opis\JsonSchema\Info\SchemaInfo;
use Opis\JsonSchema\Pragma;

abstract class PragmaParser
{
    protected string $pragma;

    /**
     * @param string $pragma
     */
    public function __construct(string $pragma)
    {
        $this->pragma = $pragma;
    }

    /**
     * @param SchemaInfo $info
     * @param SchemaParser $parser
     * @param object $shared
     * @return Pragma|null
     */
    abstract public function parse(SchemaInfo $info, SchemaParser $parser, object $shared): ?Pragma;

    /**
     * @param object|SchemaInfo $schema
     * @param string|null $pragma
     * @return bool
     */
    protected function pragmaExists(object $schema, ?string $pragma = null): bool
    {
        if ($schema instanceof SchemaInfo) {
            $schema = $schema->isObject() ? $schema->data() : null;
        }

        return is_object($schema) && property_exists($schema, $pragma ?? $this->pragma);
    }

    /**
     * @param object|SchemaInfo $schema
     * @param string|null $pragma
     * @return mixed
     */
    protected function pragmaValue(object $schema, ?string $pragma = null)
    {
        if ($schema instanceof SchemaInfo) {
            $schema = $schema->isObject() ? $schema->data() : null;
        }

        return is_object($schema) ? $schema->{$pragma ?? $this->pragma} : null;
    }

    /**
     * @param string $message
     * @param SchemaInfo $info
     * @param string|null $pragma
     * @return InvalidPragmaException
     */
    protected function pragmaException(
        string $message,
        SchemaInfo $info,
        ?string $pragma = null,
    ): InvalidPragmaException {
        $pragma = $pragma ?? $this->pragma;

        return new InvalidPragmaException(str_replace('{pragma}', $pragma, $message), $pragma, $info);
    }
}
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