1 files changed, 27 insertions, 0 deletions
diff --git a/Source/Utils/WarpXUtil.cpp b/Source/Utils/WarpXUtil.cpp
index db5a646f9..152eaba07 100644
--- a/Source/Utils/WarpXUtil.cpp
+++ b/Source/Utils/WarpXUtil.cpp
@@ -181,3 +181,30 @@ void Store_parserString(std::string query_string,
     f.clear();
 
 }
+
+
+//namespace {
+WarpXParser makeParser (std::string const& parse_function)
+{
+    WarpXParser parser(parse_function);
+    parser.registerVariables({"x","y","z"});
+    ParmParse pp("my_constants");
+    std::set<std::string> symbols = parser.symbols();
+    symbols.erase("x");
+    symbols.erase("y");
+    symbols.erase("z");
+    for (auto it = symbols.begin(); it != symbols.end(); ) {
+        Real v;
+        if (pp.query(it->c_str(), v)) {
+           parser.setConstant(*it, v);
+           it = symbols.erase(it);
+        } else {
+           ++it;
+        }
+    }
+    for (auto const& s : symbols) {
+        amrex::Abort("makeParser::Unknown symbol "+s);
+    }
+    return parser;
+}
+//}