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
  18 void Variables::set(string const & var, string const & val)
  19 {
  20         // We want to use const_iterator (Lgb)
  21         Vars::iterator cit = vars_.find(var);
  22         if (cit != vars_.end())
  23                 vars_.erase(var);
  24         vars_[var] = val;;
  25 }
  26
  27
  28 string const Variables::get(string const & var) const
  29 {
  30         Vars::const_iterator cit = vars_.find(var);
  31         if (cit != vars_.end())
  32                 return cit->second;
  33         else
  34                 return string();
  35 }
  36
  37
  38 bool Variables::isSet(string const & var) const
  39 {
  40         Vars::const_iterator cit = vars_.find(var);
  41         return (cit != vars_.end());
  42 }
  43
  44
  45 string const Variables::expand(string const & s) const
  46 {
  47         string str(s);
  48         LRegex reg("\\$\\{\\(.*\\)\\}");
  49
  50         if (!reg.exact_match(str))
  51                 return str;
  52
  53         LRegex::MatchPair match;
  54         string var;
  55
  56         do {
  57                 match = reg.first_match(str);
  58                 var = str.substr(match.first,match.second);
  59                 // we correct the match to take ${} in account.
  60                 str.replace(match.first - 2, match.second + 3, get(var));
  61         } while (reg.exact_match(str));
  62
  63         return str;
  64 }
  65
  66 #ifdef TEST
  67
  68 #include <iostream>
  69
  70
  71 namespace lyx {
  72 using std::endl;
  73 using std::cout;
  74
  75 int main() {
  76         Variables vars;
  77         vars.set("x", "hello");
  78         vars.set("y", "world");
  79         cout << vars.expand("${x}") << endl;
  80 }
  81
  82 #endif
  83
  84
  85 } // namespace lyx