/
vars.h
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/
vars.h
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/**
* stm32tpl -- STM32 C++ Template Peripheral Library
* Visit https://github.com/antongus/stm32tpl for new versions
*
* Copyright (c) 2011-2020 Anton B. Gusev aka AHTOXA
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*
* file : vars.h
* description : variable and variable list class templates.
* created on : 31.05.2010
*
*/
#ifndef STM32TPL_VARS_H_INCLUDED
#define STM32TPL_VARS_H_INCLUDED
#include "textstream.h"
#include <cstring>
/**
* Variable handler type.
*/
using VarHandler = int (*)(char *, TextStream&);
// forward declarations
class VarList;
class Variable;
typedef Variable* PVar;
static inline void AddVariable(PVar cmd);
/**
* Variable class.
* Holds two command handlers - GET handler and SET handler.
* Also holds variable name and pointer to next variable in list.
*/
class Variable
{
public:
Variable(char const* aname, VarHandler aget, VarHandler aset = nullptr)
: name_ { aname }
, get_ { aget }
, set_ { aset }
{
AddVariable(this);
}
char const* Name() { return name_; }
int Set(char* args, TextStream& stream) { return set_ ? set_(args, stream) : false; }
int Get(char* args, TextStream& stream) { return get_ ? get_(args, stream) : false; }
private:
friend class VarList;
Variable* next_ = nullptr;
char const* name_;
VarHandler get_;
VarHandler set_;
bool Match(char const* aname) { return (!strcmp(name_, aname)); }
};
/**
* class VarList - list of variables.
*/
class VarList
{
public:
static PVar Find(char const* aname)
{
for(PVar var = First(); var; var = Next(var))
{
if (var->Match(aname))
return var;
}
return 0;
}
static PVar First() { return Head(); }
static PVar Next(PVar var) { return var->next_; }
private:
friend void AddVariable(PVar cmd);
static PVar& Head()
{
static PVar head_ = 0;
return head_;
}
static void Add(PVar var)
{
PVar& head = Head();
var->next_ = head;
head = var;
}
};
inline void AddVariable(PVar var)
{
VarList::Add(var);
}
#define xstr(s) str(s)
#define str(s) #s
#define DEFINE_VARIABLE(varName) \
extern const char variable_##varName##_name[] = xstr(varName); \
int variable_##varName##_get(char * args __attribute__((unused)), TextStream& stream __attribute__((unused))); \
int variable_##varName##_set(char * args __attribute__((unused)), TextStream& stream __attribute__((unused))); \
Variable variable_##varName##_object( \
variable_##varName##_name, \
variable_##varName##_get, \
variable_##varName##_set) \
#define VARIABLE_GET_HANDLER(varName) \
int variable_##varName##_get(char * args __attribute__((unused)), TextStream& stream __attribute__((unused))) \
#define VARIABLE_SET_HANDLER(varName) \
int variable_##varName##_set(char * args __attribute__((unused)), TextStream& stream __attribute__((unused))) \
#define DEFINE_VARIABLE_RO(varName) \
extern const char variable_##varName##_name[] = xstr(varName); \
int variable_##varName##_get(char * args __attribute__((unused)), TextStream& stream __attribute__((unused))); \
Variable variable_##varName##_object( \
variable_##varName##_name, \
variable_##varName##_get) \
/**
* read-only variable declaration and get handler (combined)
*/
#define RO_VARIABLE_GET_HANDLER(varName) \
DEFINE_VARIABLE_RO(varName); \
VARIABLE_GET_HANDLER(varName)
#endif // STM32TPL_VARS_H_INCLUDED