From 73256a5af359972bea3716ba560cdc5ec56f28a5 Mon Sep 17 00:00:00 2001
From: rkansal47 <rkansal@cern.ch>
Date: Tue, 18 Jul 2023 21:09:49 -0500
Subject: [PATCH] add regex for floatNuisances

---
 src/Combine.cc | 81 ++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 79 insertions(+), 2 deletions(-)

diff --git a/src/Combine.cc b/src/Combine.cc
index 9456e43808b..56d46be90e9 100644
--- a/src/Combine.cc
+++ b/src/Combine.cc
@@ -589,14 +589,91 @@ void Combine::run(TString hlfFile, const std::string &dataset, double &limit, do
   }
 
   if (floatNuisances_ != "") {
-      RooArgSet toFloat((floatNuisances_=="all")?*nuisances:(w->argSet(floatNuisances_.c_str())));
+      // expand regexps          
+      while (floatNuisances_.find("rgx{") != std::string::npos) {          
+          size_t pos1 = floatNuisances_.find("rgx{");
+          size_t pos2 = floatNuisances_.find("}",pos1);
+          std::string prestr = floatNuisances_.substr(0,pos1);
+          std::string poststr = floatNuisances_.substr(pos2+1,floatNuisances_.size()-pos2);
+          std::string reg_esp = floatNuisances_.substr(pos1+4,pos2-pos1-4);
+          
+          //std::cout<<"interpreting "<<reg_esp<<" as regex "<<std::endl;
+          std::regex rgx( reg_esp, std::regex::ECMAScript);
+          
+          std::string matchingParams="";
+          std::unique_ptr<TIterator> iter(nuisances->createIterator());
+          for (RooAbsArg *a = (RooAbsArg*) iter->Next(); a != 0; a = (RooAbsArg*) iter->Next()) {
+              const std::string &target = a->GetName();
+              std::smatch match;
+              if (std::regex_match(target, match, rgx)) {
+                  matchingParams = matchingParams + target + ",";
+              }
+          }
+
+          floatNuisances_ = prestr+matchingParams+poststr;
+          floatNuisances_ = boost::replace_all_copy(floatNuisances_, ",,", ","); 
+          
+      }
+
+      // expand regexps          
+      while (floatNuisances_.find("var{") != std::string::npos) {          
+          size_t pos1 = floatNuisances_.find("var{");
+          size_t pos2 = floatNuisances_.find("}",pos1);
+          std::string prestr = floatNuisances_.substr(0,pos1);
+          std::string poststr = floatNuisances_.substr(pos2+1,floatNuisances_.size()-pos2);
+          std::string reg_esp = floatNuisances_.substr(pos1+4,pos2-pos1-4);
+          
+          // std::cout<<"interpreting "<<reg_esp<<" as regex "<<std::endl;
+          std::regex rgx( reg_esp, std::regex::ECMAScript);
+          
+          std::string matchingParams="";
+          std::unique_ptr<TIterator> iter(w->componentIterator());
+          for (RooAbsArg *a = (RooAbsArg*) iter->Next(); a != 0; a = (RooAbsArg*) iter->Next()) {
+
+              if ( ! (a->IsA()->InheritsFrom(RooRealVar::Class()) || a->IsA()->InheritsFrom(RooCategory::Class()))) continue;
+ 
+              const std::string &target = a->GetName();
+              // std::cout<<"var "<<target<<std::endl;
+              std::smatch match;
+              if (std::regex_match(target, match, rgx)) {
+                  matchingParams = matchingParams + target + ",";
+              }
+          }
+
+          floatNuisances_ = prestr+matchingParams+poststr;
+          floatNuisances_ = boost::replace_all_copy(floatNuisances_, ",,", ","); 
+          
+      }
+
+      //RooArgSet toFloat((floatNuisances_=="all")?*nuisances:(w->argSet(floatNuisances_.c_str())));
+      RooArgSet toFloat;
+      if (floatNuisances_=="all") {
+          toFloat.add(*nuisances);
+      } else {
+          std::vector<std::string> nuisToFloat;
+          boost::split(nuisToFloat, floatNuisances_, boost::is_any_of(","), boost::token_compress_on);
+          for (int k=0; k<(int)nuisToFloat.size(); k++) {
+              if (nuisToFloat[k]=="") continue;
+              else if(nuisToFloat[k]=="all") {
+                  toFloat.add(*nuisances);
+                  continue;
+              }
+              else if (!w->fundArg(nuisToFloat[k].c_str())) {
+                  std::cout<<"WARNING: cannot float nuisance parameter "<<nuisToFloat[k].c_str()<<" if it doesn't exist!"<<std::endl;
+                  continue;
+              }
+              const RooAbsArg *arg = (RooAbsArg*)w->fundArg(nuisToFloat[k].c_str());              
+              toFloat.add(*arg);
+          }
+      }
+
       if (verbose > 0) {  
       	std::cout << "Set floating the following parameters: "; toFloat.Print(""); 
         Logger::instance().log(std::string(Form("Combine.cc: %d -- Set floating the following parameters: ",__LINE__)),Logger::kLogLevelInfo,__func__); 
         std::unique_ptr<TIterator> iter(toFloat.createIterator());
         for (RooAbsArg *a = (RooAbsArg*) iter->Next(); a != 0; a = (RooAbsArg*) iter->Next()) {
            Logger::instance().log(std::string(Form("Combine.cc: %d  %s ",__LINE__,a->GetName())),Logger::kLogLevelInfo,__func__); 
-	}
+	      }
       }
       utils::setAllConstant(toFloat, false);
   }