libcruft-util/json/schema/base.hpp

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/*
* 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.
*
* Copyright 2018 Danny Robson <danny@nerdcruft.net>
*/
#pragma once
#include "except.hpp"
#include <string>
#include <vector>
#include <iosfwd>
namespace util::json::schema::constraint {
struct failure {
constraint::base const &rule;
::json::tree::node const &target;
};
class base {
public:
using output_container = std::vector<failure>;
using output_iterator = std::back_insert_iterator<output_container>;
virtual ~base () = default;
virtual output_iterator validate (output_iterator res, ::json::tree::node &) const noexcept = 0;
virtual std::ostream& describe (std::ostream&) const = 0;
static std::unique_ptr<base> instantiate (std::string const &name, ::json::tree::node const&);
};
inline std::ostream&
operator<< (std::ostream &os, base const &obj)
{
return obj.describe (os);
}
}