src/FDM/JSBSim/FGConfigFile.cpp

   1 /*******************************************************************************
   2
   3  Header:       FGConfigFile.h
   4  Author:       Jon Berndt
   5  Date started: 03/29/00
   6  Purpose:      Config file read-in class
   7  Called by:    FGAircraft
   8
   9 FUNCTIONAL DESCRIPTION
  10 --------------------------------------------------------------------------------
  11
  12 HISTORY
  13 --------------------------------------------------------------------------------
  14 03/16/2000 JSB  Created
  15
  16 ********************************************************************************
  17 INCLUDES
  18 *******************************************************************************/
  19
  20 #include "FGConfigFile.h"
  21 #include <stdlib.h>
  22 #include <math.h>
  23
  24 /*******************************************************************************
  25 ************************************ CODE **************************************
  26 *******************************************************************************/
  27
  28 FGConfigFile::FGConfigFile(string cfgFileName)
  29 {
  30   cfgfile.open(cfgFileName.c_str());
  31   CommentsOn = false;
  32   CurrentIndex = 0;
  33   GetNextConfigLine();
  34 }
  35
  36
  37 FGConfigFile::~FGConfigFile(void)
  38 {
  39   cfgfile.close();
  40 }
  41
  42
  43 string FGConfigFile::GetNextConfigLine(void)
  44 {
  45   do {
  46     CurrentLine = GetLine();
  47     if (CurrentLine.find("<COMMENT>") != CurrentLine.npos) CommentsOn = true;
  48     if (CurrentLine.find("</COMMENT>") != CurrentLine.npos) {
  49       CommentsOn = false;
  50       GetNextConfigLine();
  51     }
  52   } while (IsCommentLine());
  53   if (CurrentLine.length() == 0) GetNextConfigLine();
  54   CurrentIndex = 0;
  55   return CurrentLine;
  56 }
  57
  58
  59 string FGConfigFile::GetValue(string val)
  60 {
  61   unsigned int pos, p1, p2, ptest;
  62
  63   if (val == "") {    // this call is to return the tag value
  64     pos = CurrentLine.find("<");
  65     if (pos != CurrentLine.npos) { // beginning brace found "<"
  66       p1 = CurrentLine.find_first_not_of(" ",pos+1);
  67       if (p1 != CurrentLine.npos) { // found first character of tag
  68         p2 = CurrentLine.find_first_of(" >",p1+1);
  69         if (p2 == CurrentLine.npos) p2 = p1+1;
  70         return CurrentLine.substr(p1,p2-p1);
  71       }
  72     } else {   // beginning brace "<" not found; this is a regular data line
  73       pos = CurrentLine.find_first_not_of(" ");
  74       if (pos != CurrentLine.npos) {  // first character in line found
  75         p2 = CurrentLine.find_first_of(" ",pos+1);
  76         if (p2 != CurrentLine.npos) {
  77           return CurrentLine.substr(pos,p2-pos);
  78         } else {
  79           return CurrentLine.substr(pos,CurrentLine.length()-pos);
  80         }
  81       }
  82     }
  83   } else { // return a value for a specific tag
  84     pos = CurrentLine.find(val);
  85     if (pos != CurrentLine.npos) {
  86       pos = CurrentLine.find("=",pos);
  87       if (pos != CurrentLine.npos) {
  88         ptest = CurrentLine.find_first_not_of(" ",pos+1);
  89         if (ptest != CurrentLine.npos) {
  90           p1 = ptest + 1;
  91           if (CurrentLine[ptest] == '"') { // quoted
  92             p2 = CurrentLine.find_first_of("\"",p1);
  93           } else { // not quoted
  94             p2 = CurrentLine.find_first_of(" ",p1);
  95           }
  96           if (p2 != CurrentLine.npos) {
  97             return CurrentLine.substr(p1,p2-p1);
  98           }
  99         }
 100       } else {   // "=" not found
 101         pos = CurrentLine.find(val);
 102         pos = CurrentLine.find_first_of(" ",pos+1);
 103         ptest = CurrentLine.find_first_not_of(" ",pos+1);
 104         if (ptest != CurrentLine.npos) {
 105           if (CurrentLine[ptest] == '"') { // quoted
 106             p1 = ptest + 1;
 107             p2 = CurrentLine.find_first_of("\"",p1);
 108           } else { // not quoted
 109             p1 = ptest;
 110             p2 = CurrentLine.find_first_of(" ",p1);
 111           }
 112           if (p2 != CurrentLine.npos) {
 113             return CurrentLine.substr(p1,p2-p1);
 114           } else {
 115             p2 = CurrentLine.length();
 116             return CurrentLine.substr(p1,p2-p1);
 117           }
 118         }
 119       }
 120     }
 121   }
 122
 123   return string("");
 124 }
 125
 126
 127 string FGConfigFile::GetValue(void)
 128 {
 129   return GetValue("");
 130 }
 131
 132
 133 bool FGConfigFile::IsCommentLine(void)
 134 {
 135   if (CurrentLine[0] == '/' && CurrentLine[1] == '/') return true;
 136   if (CommentsOn) return true;
 137
 138   return false;
 139 }
 140
 141
 142 string FGConfigFile::GetLine(void)
 143 {
 144   string scratch = "";
 145   unsigned int test;
 146
 147   while ((test = cfgfile.get()) != EOF) {
 148     if (test >= 0x20) {
 149       scratch += (char)test;
 150     } else {
 151       if ((test = cfgfile.get()) != EOF) {
 152         if (test >= 0x20) cfgfile.unget();
 153         break;
 154       }
 155     }
 156   }
 157   if (cfgfile.eof()) return string("EOF");
 158   return scratch;
 159 }
 160
 161 FGConfigFile& FGConfigFile::operator>>(double& val)
 162 {
 163   unsigned int pos, end;
 164
 165   pos = CurrentLine.find_first_not_of(", ",CurrentIndex);
 166   if (pos == CurrentLine.npos) pos = CurrentLine.length();
 167   end = CurrentLine.find_first_of(", ",pos+1);
 168   if (end == CurrentLine.npos) end = CurrentLine.length();
 169   string str = CurrentLine.substr(pos, end - pos);
 170   val = strtod(str.c_str(),NULL);
 171   CurrentIndex = end+1;
 172   // EXPERIMENTAL
 173   if (CurrentIndex >= CurrentLine.length())
 174     GetNextConfigLine();
 175   // END EXPERIMENTAL
 176   return *this;
 177 }
 178
 179 FGConfigFile& FGConfigFile::operator>>(float& val)
 180 {
 181   unsigned int pos, end;
 182
 183   pos = CurrentLine.find_first_not_of(", ",CurrentIndex);
 184   if (pos == CurrentLine.npos) pos = CurrentLine.length();
 185   end = CurrentLine.find_first_of(", ",pos+1);
 186   if (end == CurrentLine.npos) end = CurrentLine.length();
 187   string str = CurrentLine.substr(pos, end - pos);
 188   val = strtod(str.c_str(),NULL);
 189   CurrentIndex = end+1;
 190   // EXPERIMENTAL
 191   if (CurrentIndex >= CurrentLine.length())
 192     GetNextConfigLine();
 193   // END EXPERIMENTAL
 194   return *this;
 195 }
 196
 197 FGConfigFile& FGConfigFile::operator>>(int& val)
 198 {
 199   unsigned int pos, end;
 200
 201   pos = CurrentLine.find_first_not_of(", ",CurrentIndex);
 202   if (pos == CurrentLine.npos) pos = CurrentLine.length();
 203   end = CurrentLine.find_first_of(", ",pos+1);
 204   if (end == CurrentLine.npos) end = CurrentLine.length();
 205   string str = CurrentLine.substr(pos, end - pos);
 206   val = atoi(str.c_str());
 207   CurrentIndex = end+1;
 208   // EXPERIMENTAL
 209   if (CurrentIndex >= CurrentLine.length())
 210     GetNextConfigLine();
 211   // END EXPERIMENTAL
 212   return *this;
 213 }
 214
 215 FGConfigFile& FGConfigFile::operator>>(string& str)
 216 {
 217   unsigned int pos, end;
 218
 219   pos = CurrentLine.find_first_not_of(", ",CurrentIndex);
 220   if (pos == CurrentLine.npos) pos = CurrentLine.length();
 221   end = CurrentLine.find_first_of(", ",pos+1);
 222   if (end == CurrentLine.npos) end = CurrentLine.length();
 223   str = CurrentLine.substr(pos, end - pos);
 224   CurrentIndex = end+1;
 225   // EXPERIMENTAL
 226   if (CurrentIndex >= CurrentLine.length())
 227     GetNextConfigLine();
 228   // END EXPERIMENTAL
 229   return *this;
 230 }
 231
 232
 233 void FGConfigFile::ResetLineIndexToZero(void)
 234 {
 235   CurrentIndex = 0;
 236 }
 237