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// **************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: http://www.gnu.org/licenses/gpl.html *
// * Copyright (C) Zenju (zenju AT gmx DOT de) - All Rights Reserved *
// **************************************************************************
#ifndef ERRORLOGGING_H_INCLUDED
#define ERRORLOGGING_H_INCLUDED
#include <cassert>
#include <algorithm>
#include <vector>
#include <string>
#include "time.h"
#include "i18n.h"
#include "string_base.h"
namespace zen
{
enum MessageType
{
TYPE_INFO = 0x1,
TYPE_WARNING = 0x2,
TYPE_ERROR = 0x4,
TYPE_FATAL_ERROR = 0x8,
};
typedef Zbase<wchar_t> MsgString; //std::wstring may employ small string optimization: we cannot accept bloating the "ErrorLog::entries" memory block below (think 1 million items)
struct LogEntry
{
time_t time;
MessageType type;
MsgString message;
};
template <class String>
String formatMessage(const LogEntry& entry);
class ErrorLog
{
public:
template <class String> //a wchar_t-based string!
void logMsg(const String& text, MessageType type);
int getItemCount(int typeFilter = TYPE_INFO | TYPE_WARNING | TYPE_ERROR | TYPE_FATAL_ERROR) const;
//subset of std::vector<> interface:
typedef std::vector<LogEntry>::const_iterator const_iterator;
const_iterator begin() const { return entries.begin(); }
const_iterator end () const { return entries.end (); }
bool empty() const { return entries.empty(); }
private:
std::vector<LogEntry> entries; //list of non-resolved errors and warnings
};
//######################## implementation ##########################
template <class String> inline
void ErrorLog::logMsg(const String& text, zen::MessageType type)
{
const LogEntry newEntry = { std::time(nullptr), type, copyStringTo<MsgString>(text) };
entries.push_back(newEntry);
}
inline
int ErrorLog::getItemCount(int typeFilter) const
{
return static_cast<int>(std::count_if(entries.begin(), entries.end(), [&](const LogEntry& e) { return e.type & typeFilter; }));
}
namespace
{
template <class String>
String formatMessageImpl(const LogEntry& entry) //internal linkage
{
auto getTypeName = [&]() -> std::wstring
{
switch (entry.type)
{
case TYPE_INFO:
return _("Info");
case TYPE_WARNING:
return _("Warning");
case TYPE_ERROR:
return _("Error");
case TYPE_FATAL_ERROR:
return _("Fatal Error");
}
assert(false);
return std::wstring();
};
String formattedText = L"[" + formatTime<String>(FORMAT_TIME, localTime(entry.time)) + L"] " + copyStringTo<String>(getTypeName()) + L": ";
const size_t prefixLen = formattedText.size();
for (auto iter = entry.message.begin(); iter != entry.message.end(); )
if (*iter == L'\n')
{
formattedText += L'\n';
String blanks;
blanks.resize(prefixLen, L' ');
formattedText += blanks;
do //skip duplicate newlines
{
++iter;
}
while (iter != entry.message.end() && *iter == L'\n');
}
else
formattedText += *iter++;
return formattedText;
}
}
template <class String> inline
String formatMessage(const LogEntry& entry) { return formatMessageImpl<String>(entry); }
}
#endif //ERRORLOGGING_H_INCLUDED
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