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Gaudi::Parsers::Utils Namespace Reference

Functions

std::string replaceEnvironments (const std::string &input)
 

Function Documentation

std::string Gaudi::Parsers::Utils::replaceEnvironments ( const std::string input)

Definition at line 18 of file Utils.cpp.

18  {
19  static const boost::regex expression( "\\$(([A-Za-z0-9_]+)|\\(([A-Za-z0-9_]+)\\))" );
20 
21  std::string result = input;
22  auto start = input.begin();
23  auto end = input.end();
24  boost::match_results<std::string::const_iterator> what;
25  boost::match_flag_type flags = boost::match_default;
26  while ( boost::regex_search( start, end, what, expression, flags ) ) {
27  std::string var{what[2].first, what[2].second};
28  if ( var.empty() ) var = std::string{what[3].first, what[3].second};
29  std::string env;
30  if ( System::getEnv( var, env ) ) {
31  boost::algorithm::replace_first( result, std::string{what[0].first, what[0].second}, env );
32  }
33  start = what[0].second;
34  // update flags:
35  flags |= boost::match_prev_avail;
36  flags |= boost::match_not_bob;
37  }
38  return result;
39 }
GAUDI_API std::string getEnv(const char *var)
get a particular environment variable (returning "UNKNOWN" if not set)
Definition: System.cpp:380
T end(T...args)
STL class.
start
Definition: IOTest.py:97
T begin(T...args)