lyx_mirror/src/Variables.C

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/* This file is part of
* ======================================================
*
* LyX, The Document Processor
*
* Copyright 1995 Matthias Ettrich
* Copyright 1995-2000 the LyX Team.
*
* ====================================================== */
#include <config.h>
#ifdef __GNUG__
#pragma implementation "Variables.h"
#endif
#include "Variables.h"
#include "support/LRegex.h"
void Variables::set(string const &var, string const &val)
{
Vars::const_iterator cit = vars_.find(var);
if (cit != vars_.end())
vars_.erase(var);
vars_[var] = val;;
}
string Variables::get(string const &var) const
{
Vars::const_iterator cit = vars_.find(var);
if (cit != vars_.end())
return (*cit).second;
else
return string();
}
bool Variables::isset(string const & var) const
{
Vars::const_iterator cit = vars_.find(var);
return (cit != vars_.end());
}
string Variables::expand(string str) const
{
LRegex reg("\\$\\{\\(.*\\)\\}");
if (!reg.exact_match(str))
return str;
LRegex::MatchPair match;
string var;
do {
match = reg.first_match(str);
var = str.substr(match.first,match.second);
// we correct the match to take ${} in account.
str.replace(match.first - 2, match.second + 3, get(var));
} while (reg.exact_match(str));
return str;
}
#ifdef TEST
#include <iostream>
using std::endl;
using std::cout;
int main() {
Variables vars;
vars.set("x", "hello");
vars.set("y", "world");
cout << vars.expand("${x}") << endl;
}
#endif