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Functions
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 {
28 std::string var{what[2].first,what[2].second};
29 if (var.empty()) var = std::string{what[3].first,what[3].second};
30 std::string env;
31 if ( System::getEnv( var, env ) ) {
32 boost::algorithm::replace_first(result,
33 std::string{ what[0].first, what[0].second },
34 env);
35 }
36 start = what[0].second;
37 // update flags:
38 flags |= boost::match_prev_avail;
39 flags |= boost::match_not_bob;
40 }
41 return result;
42 }
System::getEnv
GAUDI_API std::string getEnv(const char *var)
get a particular environment variable (returning "UNKNOWN" if not set)
Definition: System.cpp:550
std::string::end
T end(T...args)
std::string
STL class.
IOTest.start
start
Definition: IOTest.py:88
end
auto end(reverse_wrapper< T > &w)
Definition: reverse.h:50
std::string::begin
T begin(T...args)