src/Variables.cpp

   1 /**
   2  * \file Variables.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Lars Gullik Bjønnes
   7  * \author Jean-Marc Lasgouttes
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "Variables.h"
  15 #include "support/LRegex.h"
  16
  17 using namespace std;
  18
  19 void Variables::set(string const & var, string const & val)
  20 {
  21         // We want to use const_iterator (Lgb)
  22         Vars::iterator cit = vars_.find(var);
  23         if (cit != vars_.end())
  24                 vars_.erase(var);
  25         vars_[var] = val;;
  26 }
  27
  28
  29 string const Variables::get(string const & var) const
  30 {
  31         Vars::const_iterator cit = vars_.find(var);
  32         if (cit != vars_.end())
  33                 return cit->second;
  34         else
  35                 return string();
  36 }
  37
  38
  39 bool Variables::isSet(string const & var) const
  40 {
  41         Vars::const_iterator cit = vars_.find(var);
  42         return (cit != vars_.end());
  43 }
  44
  45
  46 string const Variables::expand(string const & s) const
  47 {
  48         string str(s);
  49         LRegex reg("\\$\\{\\(.*\\)\\}");
  50
  51         if (!reg.exact_match(str))
  52                 return str;
  53
  54         LRegex::MatchPair match;
  55         string var;
  56
  57         do {
  58                 match = reg.first_match(str);
  59                 var = str.substr(match.first,match.second);
  60                 // we correct the match to take ${} in account.
  61                 str.replace(match.first - 2, match.second + 3, get(var));
  62         } while (reg.exact_match(str));
  63
  64         return str;
  65 }
  66
  67 #ifdef TEST
  68
  69 #include <iostream>
  70
  71 namespace lyx {
  72
  73 int main() {
  74         Variables vars;
  75         vars.set("x", "hello");
  76         vars.set("y", "world");
  77         cout << vars.expand("${x}") << endl;
  78 }
  79
  80 #endif
  81
  82
  83 } // namespace lyx