1 files changed, 94 insertions, 0 deletions
diff --git a/Source/Utils/WarpXAlgorithmSelection.cpp b/Source/Utils/WarpXAlgorithmSelection.cpp
new file mode 100644
index 000000000..89802e064
--- /dev/null
+++ b/Source/Utils/WarpXAlgorithmSelection.cpp
@@ -0,0 +1,94 @@
+#include <WarpXAlgorithmSelection.H>
+#include <map>
+#include <algorithm>
+
+// Define dictionary with correspondance between user-input strings,
+// and corresponding integer for use inside the code (e.g. in PICSAR).
+
+const std::map<std::string, int> maxwell_solver_algo_to_int = {
+    {"yee",     MaxwellSolverAlgo::Yee },
+#ifndef WARPX_RZ // Not available in RZ
+    {"ckc",     MaxwellSolverAlgo::CKC },
+#endif
+    {"default", MaxwellSolverAlgo::Yee }
+};
+
+const std::map<std::string, int> particle_pusher_algo_to_int = {
+    {"boris",   ParticlePusherAlgo::Boris },
+    {"vay",     ParticlePusherAlgo::Vay },
+    {"default", ParticlePusherAlgo::Boris }
+};
+
+const std::map<std::string, int> current_deposition_algo_to_int = {
+    {"esirkepov",            CurrentDepositionAlgo::Esirkepov },
+    {"direct",               CurrentDepositionAlgo::Direct },
+#if (!defined AMREX_USE_GPU)&&(AMREX_SPACEDIM == 3) // Only available on CPU and 3D
+    {"direct-vectorized",    CurrentDepositionAlgo::DirectVectorized },
+#endif
+    {"default",              CurrentDepositionAlgo::Esirkepov }
+};
+
+const std::map<std::string, int> charge_deposition_algo_to_int = {
+    {"standard",   ChargeDepositionAlgo::Standard },
+#if (!defined AMREX_USE_GPU)&&(AMREX_SPACEDIM == 3) // Only available on CPU and 3D
+    {"vectorized", ChargeDepositionAlgo::Vectorized },
+    {"default",    ChargeDepositionAlgo::Vectorized }
+#else
+    {"default",    ChargeDepositionAlgo::Standard }
+#endif
+};
+
+const std::map<std::string, int> gathering_algo_to_int = {
+    {"standard",   GatheringAlgo::Standard },
+#ifndef AMREX_USE_GPU // Only available on CPU
+    {"vectorized", GatheringAlgo::Vectorized },
+    {"default",    GatheringAlgo::Vectorized }
+#else
+    {"default",    GatheringAlgo::Standard }
+#endif
+};
+
+
+int
+GetAlgorithmInteger( amrex::ParmParse& pp, const char* pp_search_key ){
+
+    // Read user input ; use "default" if it is not found
+    std::string algo = "default";
+    pp.query( pp_search_key, algo );
+    // Convert to lower case
+    std::transform(algo.begin(), algo.end(), algo.begin(), ::tolower);
+
+    // Pick the right dictionary
+    std::map<std::string, int> algo_to_int;
+    if (pp_search_key == "maxwell_fdtd_solver") {
+        algo_to_int = maxwell_solver_algo_to_int;
+    } else if (pp_search_key == "particle_pusher") {
+        algo_to_int = particle_pusher_algo_to_int;
+    } else if (pp_search_key == "current_deposition") {
+        algo_to_int = current_deposition_algo_to_int;
+    } else if (pp_search_key == "charge_deposition") {
+        algo_to_int = charge_deposition_algo_to_int;
+    } else if (pp_search_key == "field_gathering") {
+        algo_to_int = gathering_algo_to_int;
+    } else {
+        std::string pp_search_string = pp_search_key;
+        amrex::Abort("Unknown algorithm type: " + pp_search_string);
+    }
+
+    // Check if the user-input is a valid key for the dictionary
+    if (algo_to_int.count(algo) == 0){
+        // Not a valid key ; print error message
+        std::string pp_search_string = pp_search_key;
+        std::string error_message = "Invalid string for algo." + pp_search_string
+            + ": " + algo + ".\nThe valid values are:\n";
+        for ( const auto &valid_pair : algo_to_int ) {
+            if (valid_pair.first != "default"){
+                error_message += " - " + valid_pair.first + "\n";
+            }
+        }
+        amrex::Abort(error_message);
+    }
+
+    // If the input is a valid key, return the value
+    return algo_to_int[algo];
+}