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/* Copyright © 2007-2015 Jakub Wilk <jwilk@jwilk.net>
*
* This file is part of pdf2djvu.
*
* pdf2djvu is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* pdf2djvu 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.
*/
#ifndef PDF2DJVU_DEBUG_H
#define PDF2DJVU_DEBUG_H
#include <ostream>
#include <sstream>
#include <stdexcept>
#include <string>
#include "system.hh"
class DebugStream;
template <typename tp>
static inline DebugStream &operator<<(DebugStream &, const tp &);
class DebugStream
{
protected:
unsigned int level;
bool started;
std::ostream &ostream;
void indent();
public:
explicit DebugStream(std::ostream &ostream)
: level(0), started(false), ostream(ostream)
{ }
void operator ++(int) { this->level++; }
void operator --(int) { this->level--; }
template <typename tp>
friend DebugStream &operator<<(DebugStream &, const tp &);
friend DebugStream &operator<<(DebugStream &stream, std::ostream& (*)(std::ostream&));
};
DebugStream &debug(int n, int threshold);
extern DebugStream error_log;
extern std::ostream &dev_null;
static inline std::ostream &operator<<(std::ostream &stream, const std::runtime_error &error)
{
stream << error.what();
return stream;
}
template <typename tp>
static inline DebugStream &operator<<(DebugStream &stream, const tp &object)
{
if (!stream.started)
{
stream.indent();
stream.started = true;
}
std::ostringstream buffer;
buffer.copyfmt(stream.ostream);
buffer << object;
std::string string = buffer.str();
stream.ostream << encoding::proxy<encoding::native, encoding::terminal>(string);
return stream;
}
#endif
// vim:ts=2 sts=2 sw=2 et
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