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 static const char *IdSrc = "$Header$";
  25 static const char *IdHdr = "ID_CONFIGFILE";
  26
  27 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  28 CLASS IMPLEMENTATION
  29 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
  30
  31 FGConfigFile::FGConfigFile(string cfgFileName)
  32 {
  33   cfgfile.open(cfgFileName.c_str());
  34   CommentsOn = false;
  35   CurrentIndex = 0;
  36   Opened = true;
  37   if (cfgfile.is_open()) GetNextConfigLine();
  38   else Opened = false;
  39 }
  40
  41
  42 FGConfigFile::~FGConfigFile(void)
  43 {
  44   cfgfile.close();
  45 }
  46
  47
  48 string FGConfigFile::GetNextConfigLine(void)
  49 {
  50   do {
  51     CurrentLine = GetLine();
  52     if (CurrentLine.find("<COMMENT>") != CurrentLine.npos) CommentsOn = true;
  53     if (CurrentLine.find("</COMMENT>") != CurrentLine.npos) {
  54       CommentsOn = false;
  55       GetNextConfigLine();
  56     }
  57   } while (IsCommentLine());
  58   if (CurrentLine.length() == 0) GetNextConfigLine();
  59   CurrentIndex = 0;
  60   return CurrentLine;
  61 }
  62
  63
  64 string FGConfigFile::GetValue(string val)
  65 {
  66   unsigned int pos, p1, p2, ptest;
  67
  68   if (val == "") {    // this call is to return the tag value
  69     pos = CurrentLine.find("<");
  70     if (pos != CurrentLine.npos) { // beginning brace found "<"
  71       p1 = CurrentLine.find_first_not_of(" ",pos+1);
  72       if (p1 != CurrentLine.npos) { // found first character of tag
  73         p2 = CurrentLine.find_first_of(" >",p1+1);
  74         if (p2 == CurrentLine.npos) p2 = p1+1;
  75         return CurrentLine.substr(p1,p2-p1);
  76       }
  77     } else {   // beginning brace "<" not found; this is a regular data line
  78       pos = CurrentLine.find_first_not_of(" ");
  79       if (pos != CurrentLine.npos) {  // first character in line found
  80         p2 = CurrentLine.find_first_of(" ",pos+1);
  81         if (p2 != CurrentLine.npos) {
  82           return CurrentLine.substr(pos,p2-pos);
  83         } else {
  84           return CurrentLine.substr(pos,CurrentLine.length()-pos);
  85         }
  86       }
  87     }
  88   } else { // return a value for a specific tag
  89     pos = CurrentLine.find(val);
  90     if (pos != CurrentLine.npos) {
  91       pos = CurrentLine.find("=",pos);
  92       if (pos != CurrentLine.npos) {
  93         ptest = CurrentLine.find_first_not_of(" ",pos+1);
  94         if (ptest != CurrentLine.npos) {
  95           p1 = ptest + 1;
  96           if (CurrentLine[ptest] == '"') { // quoted
  97             p2 = CurrentLine.find_first_of("\"",p1);
  98           } else { // not quoted
  99             p2 = CurrentLine.find_first_of(" ",p1);
 100           }
 101           if (p2 != CurrentLine.npos) {
 102             return CurrentLine.substr(p1,p2-p1);
 103           }
 104         }
 105       } else {   // "=" not found
 106         pos = CurrentLine.find(val);
 107         pos = CurrentLine.find_first_of(" ",pos+1);
 108         ptest = CurrentLine.find_first_not_of(" ",pos+1);
 109         if (ptest != CurrentLine.npos) {
 110           if (CurrentLine[ptest] == '"') { // quoted
 111             p1 = ptest + 1;
 112             p2 = CurrentLine.find_first_of("\"",p1);
 113           } else { // not quoted
 114             p1 = ptest;
 115             p2 = CurrentLine.find_first_of(" ",p1);
 116           }
 117           if (p2 != CurrentLine.npos) {
 118             return CurrentLine.substr(p1,p2-p1);
 119           } else {
 120             p2 = CurrentLine.length();
 121             return CurrentLine.substr(p1,p2-p1);
 122           }
 123         }
 124       }
 125     }
 126   }
 127
 128   return string("");
 129 }
 130
 131
 132 string FGConfigFile::GetValue(void)
 133 {
 134   return GetValue("");
 135 }
 136
 137
 138 bool FGConfigFile::IsCommentLine(void)
 139 {
 140   if (CurrentLine[0] == '/' && CurrentLine[1] == '/') return true;
 141   if (CommentsOn) return true;
 142
 143   return false;
 144 }
 145
 146
 147 string FGConfigFile::GetLine(void)
 148 {
 149   string scratch = "";
 150   unsigned int test;
 151
 152   while ((test = cfgfile.get()) != EOF) {
 153     if (test >= 0x20) {
 154       scratch += (char)test;
 155     } else {
 156       if ((test = cfgfile.get()) != EOF) {
 157         if (test >= 0x20) cfgfile.unget();
 158         break;
 159       }
 160     }
 161   }
 162   if (cfgfile.eof()) return string("EOF");
 163   return scratch;
 164 }
 165
 166 FGConfigFile& FGConfigFile::operator>>(double& val)
 167 {
 168   unsigned int pos, end;
 169
 170   pos = CurrentLine.find_first_not_of(", ",CurrentIndex);
 171   if (pos == CurrentLine.npos) pos = CurrentLine.length();
 172   end = CurrentLine.find_first_of(", ",pos+1);
 173   if (end == CurrentLine.npos) end = CurrentLine.length();
 174   string str = CurrentLine.substr(pos, end - pos);
 175   val = strtod(str.c_str(),NULL);
 176   CurrentIndex = end+1;
 177   if (CurrentIndex >= CurrentLine.length()) GetNextConfigLine();
 178   return *this;
 179 }
 180
 181 FGConfigFile& FGConfigFile::operator>>(float& val)
 182 {
 183   unsigned int pos, end;
 184
 185   pos = CurrentLine.find_first_not_of(", ",CurrentIndex);
 186   if (pos == CurrentLine.npos) pos = CurrentLine.length();
 187   end = CurrentLine.find_first_of(", ",pos+1);
 188   if (end == CurrentLine.npos) end = CurrentLine.length();
 189   string str = CurrentLine.substr(pos, end - pos);
 190   val = strtod(str.c_str(),NULL);
 191   CurrentIndex = end+1;
 192   if (CurrentIndex >= CurrentLine.length()) GetNextConfigLine();
 193   return *this;
 194 }
 195
 196 FGConfigFile& FGConfigFile::operator>>(int& val)
 197 {
 198   unsigned int pos, end;
 199
 200   pos = CurrentLine.find_first_not_of(", ",CurrentIndex);
 201   if (pos == CurrentLine.npos) pos = CurrentLine.length();
 202   end = CurrentLine.find_first_of(", ",pos+1);
 203   if (end == CurrentLine.npos) end = CurrentLine.length();
 204   string str = CurrentLine.substr(pos, end - pos);
 205   val = atoi(str.c_str());
 206   CurrentIndex = end+1;
 207   if (CurrentIndex >= CurrentLine.length()) GetNextConfigLine();
 208   return *this;
 209 }
 210
 211 FGConfigFile& FGConfigFile::operator>>(eParam& val)
 212 {
 213   unsigned int pos, end;
 214
 215   pos = CurrentLine.find_first_not_of(", ",CurrentIndex);
 216   if (pos == CurrentLine.npos) pos = CurrentLine.length();
 217   end = CurrentLine.find_first_of(", ",pos+1);
 218   if (end == CurrentLine.npos) end = CurrentLine.length();
 219   string str = CurrentLine.substr(pos, end - pos);
 220   val = (eParam)atoi(str.c_str());
 221   CurrentIndex = end+1;
 222   if (CurrentIndex >= CurrentLine.length()) GetNextConfigLine();
 223   return *this;
 224 }
 225
 226 FGConfigFile& FGConfigFile::operator>>(string& str)
 227 {
 228   unsigned int pos, end;
 229
 230   pos = CurrentLine.find_first_not_of(", ",CurrentIndex);
 231   if (pos == CurrentLine.npos) pos = CurrentLine.length();
 232   end = CurrentLine.find_first_of(", ",pos+1);
 233   if (end == CurrentLine.npos) end = CurrentLine.length();
 234   str = CurrentLine.substr(pos, end - pos);
 235   CurrentIndex = end+1;
 236   if (CurrentIndex >= CurrentLine.length()) GetNextConfigLine();
 237   return *this;
 238 }
 239
 240
 241 void FGConfigFile::ResetLineIndexToZero(void)
 242 {
 243   CurrentIndex = 0;
 244 }
 245