libcruft-util/cpp.hpp

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2018-04-01 14:49:10 +10:00
/*
* 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>
*/
#ifndef CRUFT_UTIL_CPP_HPP
#define CRUFT_UTIL_CPP_HPP
#include "string.hpp"
#include "view.hpp"
#include <experimental/filesystem>
#include <string>
#include <map>
#include <stdexcept>
#include <stack>
namespace util::cpp {
///////////////////////////////////////////////////////////////////////////
struct context {
std::stack<std::experimental::filesystem::path> source;
std::map<std::string,std::string> defines;
};
///////////////////////////////////////////////////////////////////////////
class directive {
public:
virtual ~directive () = default;
virtual util::tokeniser<const char*>::iterator
process (std::ostream&,
context&,
util::view<util::tokeniser<const char*>::iterator>) const = 0;
};
///////////////////////////////////////////////////////////////////////////
class processor {
public:
processor ();
void add (std::string token, std::unique_ptr<directive>);
void process (std::ostream&, const std::experimental::filesystem::path&) const;
std::experimental::filesystem::path
resolve (const std::experimental::filesystem::path&) const;
util::tokeniser<const char*>::iterator
process (std::ostream&,
context&,
util::view<util::tokeniser<const char*>::iterator>) const;
private:
std::map<std::string, std::unique_ptr<directive>> m_directives;
};
///////////////////////////////////////////////////////////////////////////
class unknown_directive : public std::runtime_error {
using runtime_error::runtime_error;
};
///////////////////////////////////////////////////////////////////////////
class ignore final : public directive {
virtual util::tokeniser<const char*>::iterator
process (std::ostream&,
context&,
util::view<util::tokeniser<const char*>::iterator> lines) const override
{ return lines.begin ()++; }
};
//-------------------------------------------------------------------------
class passthrough final : public directive {
public:
passthrough (const std::string &name);
virtual util::tokeniser<const char*>::iterator
process (std::ostream&,
context&,
util::view<util::tokeniser<const char*>::iterator>) const override;
private:
const std::string m_name;
};
//-------------------------------------------------------------------------
class include : public directive {
public:
include (processor &_parent);
void add (const std::experimental::filesystem::path&);
virtual util::tokeniser<const char*>::iterator
process (std::ostream&,
context&,
util::view<util::tokeniser<const char*>::iterator>) const override;
private:
processor &m_parent;
std::vector<std::experimental::filesystem::path> m_paths;
};
};
#endif