Dogcows Code - chaz/yoink/blob - src/Moof/Log.hh

   1
   2 /*******************************************************************************
   3
   4  Copyright (c) 2009, Charles McGarvey
   5  All rights reserved.
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   7  Redistribution   and   use  in  source  and  binary  forms,  with  or  without
   8  modification, are permitted provided that the following conditions are met:
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  10    * Redistributions  of  source  code  must retain the above copyright notice,
  11      this list of conditions and the following disclaimer.
  12    * Redistributions  in binary form must reproduce the above copyright notice,
  13      this  list of conditions and the following disclaimer in the documentation
  14      and/or other materials provided with the distribution.
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  16  THIS  SOFTWARE  IS  PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17  AND  ANY  EXPRESS  OR  IMPLIED  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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  27 *******************************************************************************/
  28
  29 #ifndef _MOOF_LOG_H_
  30 #define _MOOF_LOG_H_
  31
  32 /**
  33  * @file log.h
  34  * Functions related to logging the process.
  35  * The logging functions are logError(), logWarning(), logInfo(), and
  36  * logDebug(), listed from most critical to least critical.
  37  */
  38
  39 #include <cstdlib>              // exit
  40 #include <iostream>
  41
  42
  43 /**
  44  * Macro which tests an assertion and issues an logError() and exits if false.
  45  * @param X test to perform
  46  */
  47
  48 #undef ASSERT
  49
  50 #if NDEBUG
  51 #define ASSERT(X)
  52 #else
  53 #define ASSERT(X) if (!(X)) Mf::logError << \
  54         "false assertion at " << __FILE__ << ":" << __LINE__ << ", " << #X, exit(1)
  55 #endif
  56
  57
  58 namespace Mf {
  59
  60
  61 class Log
  62 {
  63 public:
  64
  65         enum Level
  66         {
  67                 NONE            = -1,           ///< Disable all logging.
  68                 ERRORR          =  1,           ///< Log only errors.
  69                 WARNING         =  2,           ///< Log warnings and errors.
  70                 SCRIPT          =  3,           ///< Log messages from Lua, too.
  71                 INFO            =  4,           ///< Log info, warnings, errors.
  72                 DEBUGG          =  5,           ///< Log all messages.
  73         };
  74
  75         static void setLevel(Level level);
  76         static Level getLevel();
  77
  78
  79         Log(Level level, const char* type) :
  80                 mLevel(level),
  81                 mType(type) /* only pass literal strings */ {}
  82
  83
  84         template <typename T>
  85         void operator () (const T& item)
  86         {
  87                 *this << item << std::endl;
  88         }
  89
  90 private:
  91
  92         template <typename T> friend std::ostream& operator << (Log&, const T&);
  93
  94         static Level    gLevel;
  95
  96         Level                   mLevel;
  97         const char*             mType;
  98 };
  99
 100
 101 extern std::ostream&    log;
 102 extern std::ostream&    nullLog;
 103
 104 extern Log logError;
 105 extern Log logWarning;
 106 extern Log logInfo;
 107 extern Log logDebug;
 108
 109
 110 template <typename T>
 111 inline std::ostream& operator << (Log& logObj, const T& item)
 112 {
 113         if (Log::gLevel < logObj.mLevel) return nullLog;
 114         return log << logObj.mType << item;
 115 }
 116
 117
 118 class Script;
 119 void importLogPrintFunction(Script& script);
 120
 121
 122 } // namespace Mf
 123
 124 #endif // _MOOF_LOG_H_
 125