granicus.if.org Git - icinga2/blob - lib/base/debuginfo.cpp

   1 /******************************************************************************
   2  * Icinga 2                                                                   *
   3  * Copyright (C) 2012-2016 Icinga Development Team (https://www.icinga.org/)  *
   4  *                                                                            *
   5  * This program is free software; you can redistribute it and/or              *
   6  * modify it under the terms of the GNU General Public License                *
   7  * as published by the Free Software Foundation; either version 2             *
   8  * of the License, or (at your option) any later version.                     *
   9  *                                                                            *
  10  * This program is distributed in the hope that it will be useful,            *
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of             *
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the              *
  13  * GNU General Public License for more details.                               *
  14  *                                                                            *
  15  * You should have received a copy of the GNU General Public License          *
  16  * along with this program; if not, write to the Free Software Foundation     *
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.             *
  18  ******************************************************************************/
  19
  20 #include "base/debuginfo.hpp"
  21 #include "base/convert.hpp"
  22 #include <fstream>
  23
  24 using namespace icinga;
  25
  26 DebugInfo::DebugInfo(void)
  27         : FirstLine(0), FirstColumn(0), LastLine(0), LastColumn(0)
  28 { }
  29
  30 /**
  31  * Outputs a DebugInfo struct to a stream.
  32  *
  33  * @param out The output stream.
  34  * @param val The DebugInfo struct.
  35  * @returns The output stream.
  36  */
  37 std::ostream& icinga::operator<<(std::ostream& out, const DebugInfo& val)
  38 {
  39         out << "in " << val.Path << ": "
  40             << val.FirstLine << ":" << val.FirstColumn
  41             << "-"
  42             << val.LastLine << ":" << val.LastColumn;
  43
  44         return out;
  45 }
  46
  47 DebugInfo icinga::DebugInfoRange(const DebugInfo& start, const DebugInfo& end)
  48 {
  49         DebugInfo result;
  50         result.Path = start.Path;
  51         result.FirstLine = start.FirstLine;
  52         result.FirstColumn = start.FirstColumn;
  53         result.LastLine = end.LastLine;
  54         result.LastColumn = end.LastColumn;
  55         return result;
  56 }
  57
  58 #define EXTRA_LINES 2
  59
  60 void icinga::ShowCodeLocation(std::ostream& out, const DebugInfo& di, bool verbose)
  61 {
  62         if (di.Path.IsEmpty())
  63                 return;
  64
  65         out << "Location: " << di << "\n";
  66
  67         std::ifstream ifs;
  68         ifs.open(di.Path.CStr(), std::ifstream::in);
  69
  70         int lineno = 0;
  71         char line[1024];
  72
  73         while (ifs.good() && lineno <= di.LastLine + EXTRA_LINES) {
  74                 lineno++;
  75
  76                 ifs.getline(line, sizeof(line));
  77
  78                 for (int i = 0; line[i]; i++)
  79                         if (line[i] == '\t')
  80                                 line[i] = ' ';
  81
  82                 int extra_lines = verbose ? EXTRA_LINES : 0;
  83
  84                 if (lineno < di.FirstLine - extra_lines || lineno > di.LastLine + extra_lines)
  85                         continue;
  86
  87                 String pathInfo = di.Path + "(" + Convert::ToString(lineno) + "): ";
  88                 out << pathInfo;
  89                 out << line << "\n";
  90
  91                 if (lineno >= di.FirstLine && lineno <= di.LastLine) {
  92                         int start, end;
  93
  94                         start = 0;
  95                         end = strlen(line);
  96
  97                         if (lineno == di.FirstLine)
  98                                 start = di.FirstColumn - 1;
  99
 100                         if (lineno == di.LastLine)
 101                                 end = di.LastColumn;
 102
 103                         if (start < 0) {
 104                                 end -= start;
 105                                 start = 0;
 106                         }
 107
 108                         out << String(pathInfo.GetLength(), ' ');
 109                         out << String(start, ' ');
 110                         out << String(end - start, '^');
 111
 112                         out << "\n";
 113                 }
 114         }
 115 }
 116