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/*
* Copyright 2003-2021 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_CONFIG_BLOCK_HXX
#define MPD_CONFIG_BLOCK_HXX
#include "util/Compiler.h"
#include <string>
#include <vector>
class AllocatedPath;
struct BlockParam {
std::string name;
std::string value;
int line;
/**
* This flag is false when nobody has queried the value of
* this option yet.
*/
mutable bool used = false;
template<typename N, typename V>
gcc_nonnull_all
BlockParam(N &&_name, V &&_value, int _line=-1) noexcept
:name(std::forward<N>(_name)), value(std::forward<V>(_value)),
line(_line) {}
int GetIntValue() const;
unsigned GetUnsignedValue() const;
unsigned GetPositiveValue() const;
bool GetBoolValue() const;
/**
* Call this method in a "catch" block to throw a nested
* exception showing the location of this setting in the
* configuration file.
*/
[[noreturn]]
void ThrowWithNested() const;
/**
* Invoke a function with the configured value; if the
* function throws, call ThrowWithNested().
*/
template<typename F>
auto With(F &&f) const {
try {
return f(value.c_str());
} catch (...) {
ThrowWithNested();
}
}
};
struct ConfigBlock {
int line;
std::vector<BlockParam> block_params;
/**
* This flag is false when nobody has queried the value of
* this option yet.
*/
mutable bool used = false;
explicit ConfigBlock(int _line=-1)
:line(_line) {}
ConfigBlock(ConfigBlock &&) = default;
ConfigBlock &operator=(ConfigBlock &&) = default;
/**
* Determine if this is a "null" instance, i.e. an empty
* object that was synthesized and not loaded from a
* configuration file.
*/
bool IsNull() const noexcept {
return line < 0;
}
gcc_pure
bool IsEmpty() const noexcept {
return block_params.empty();
}
void SetUsed() const noexcept {
used = true;
}
template<typename N, typename V>
gcc_nonnull_all
void AddBlockParam(N &&_name, V &&_value, int _line=-1) noexcept {
block_params.emplace_back(std::forward<N>(_name),
std::forward<V>(_value),
_line);
}
gcc_nonnull_all gcc_pure
const BlockParam *GetBlockParam(const char *_name) const noexcept;
gcc_pure
const char *GetBlockValue(const char *name,
const char *default_value=nullptr) const noexcept;
/**
* Same as ConfigData::GetPath(), but looks up the setting in the
* specified block.
*
* Throws #std::runtime_error on error.
*/
AllocatedPath GetPath(const char *name,
const char *default_value=nullptr) const;
int GetBlockValue(const char *name, int default_value) const;
unsigned GetBlockValue(const char *name, unsigned default_value) const;
unsigned GetPositiveValue(const char *name, unsigned default_value) const;
bool GetBlockValue(const char *name, bool default_value) const;
};
#endif
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