/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/PhysicsTools/FWLite/src/ScannerHelpers.cc

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#include <PhysicsTools/FWLite/interface/ScannerHelpers.h>

#include "CommonTools/Utils/src/ExpressionPtr.h"
#include "CommonTools/Utils/src/Grammar.h"
#include "FWCore/Utilities/interface/EDMException.h"
#include <iostream>

reco::parser::ExpressionPtr
helper::Parser::makeExpression(const std::string &expr, const edm::TypeWithDict &type) {
    reco::parser::ExpressionPtr ret;

    using namespace boost::spirit::classic;
    reco::parser::Grammar grammar(ret, type, true);
    const char* startingFrom = expr.c_str();
    try {
        parse(startingFrom, grammar.use_parser<1>() >> end_p, space_p).full; 
    } catch(reco::parser::BaseException&e){
        std::cerr << "Expression parser error:"<<reco::parser::baseExceptionWhat(e)<<" (char "<<e.where-startingFrom<<")" << std::endl;
    }
    return ret;
}

reco::parser::SelectorPtr
helper::Parser::makeSelector(const std::string &expr, const edm::TypeWithDict &type) {
    reco::parser::SelectorPtr ret;

    using namespace boost::spirit::classic;
    reco::parser::Grammar grammar(ret, type, true);
    const char* startingFrom = expr.c_str();
    try {
        parse(startingFrom, grammar.use_parser<0>() >> end_p, space_p).full; 
    } catch(reco::parser::BaseException&e){
        std::cerr << "Selector parser error:"<<reco::parser::baseExceptionWhat(e)<<" (char "<<e.where-startingFrom<<")" << std::endl;
    }
    return ret;
}

edm::TypeWithDict
helper::Parser::elementType(const edm::TypeWithDict &wrapperType) {
    edm::TypeWithDict collection = wrapperType.templateArgumentAt(0);
    // now search for value_type
    edm::TypeWithDict objtype = collection.nestedType("value_type");
    if(bool(objtype)) {
      return objtype;
    }
    std::cerr << "Can't get a type out of " << wrapperType.name() << std::endl;
    return edm::TypeWithDict();
}

bool
helper::Parser::test(const reco::parser::SelectorPtr &sel, const edm::TypeWithDict type, const void * ptr) {
    if (sel.get() == 0) return false;edm::ObjectWithDict obj(type, const_cast<void *>(ptr));
    return (*sel)(obj);
}

double
helper::Parser::eval(const reco::parser::ExpressionPtr &expr, const edm::TypeWithDict type, const void * ptr) {
    if (expr.get() == 0) return 0;
    edm::ObjectWithDict obj(type, const_cast<void *>(ptr));
    return expr->value(obj);
}

bool
helper::ScannerBase::addExpression(const char *expr) {
    bool ok = true;
    exprs_.push_back(helper::Parser::makeExpression(expr,objType_));
    if (exprs_.back().get() == 0) {
        std::cerr << "Failed to parse expression " << expr << std::endl;
        exprs_.pop_back();
        ok = false;
    }
    return ok;
}

bool
helper::ScannerBase::setCut(const char *cut) {
    bool ok = true;
    cuts_[0] = helper::Parser::makeSelector(cut,objType_);
    if (strlen(cut) && !cuts_[0].get()) {
        std::cerr << "Failed to set cut \"" << cut << "\"" << std::endl;
        ok = false;
    }
    return ok;
}

void
helper::ScannerBase::clearCut() {
    cuts_[0].reset();
}

void
helper::ScannerBase::clearExtraCuts() {
    cuts_.resize(1);
}


bool
helper::ScannerBase::addExtraCut(const char *cut) {
    bool ok = true;
    cuts_.push_back(helper::Parser::makeSelector(cut,objType_));
    if (!cuts_.back().get()) {
        std::cerr << "Failed to add cut \"" << cut << "\"" << std::endl;
        ok = false;
        cuts_.pop_back();
    }
    return ok;
}


bool
helper::ScannerBase::test(const void *ptr, size_t icut) const {
    if (icut >= cuts_.size()) return false;
    if (cuts_[icut].get() == 0) return true;
    try {
        edm::ObjectWithDict obj(objType_, const_cast<void *>(ptr));
        return (*cuts_[icut])(obj);
    } catch (std::exception &ex) {
        if (!ignoreExceptions_) std::cerr << "Caught exception " << ex.what() << std::endl;
        return false;
    }
}

double
helper::ScannerBase::eval(const void *ptr, size_t iexpr) const {
    try {
        edm::ObjectWithDict obj(objType_, const_cast<void *>(ptr));
        if (exprs_.size() > iexpr)  return exprs_[iexpr]->value(obj);
    } catch (std::exception &ex) {
        if (!ignoreExceptions_) std::cerr << "Caught exception " << ex.what() << std::endl;
    }
    return 0;
}

void
helper::ScannerBase::print(const void *ptr) const {
    edm::ObjectWithDict obj(objType_, const_cast<void *>(ptr));
    if ((cuts_[0].get() == 0) || (*cuts_[0])(obj)) {
        for (std::vector<reco::parser::ExpressionPtr>::const_iterator it = exprs_.begin(), ed = exprs_.end(); it != ed; ++it) {
            if (ptr == 0 || it->get() == 0) {
                printf(" : %8s", "#ERR");
            } else {  
                try {
                    double val = (*it)->value(obj);
                    // I found no easy ways to enforce a fixed width from printf that works also with leading zeroes or large exponents (e.g. 1e15 or 1e101)
                    // So we have to go the ugly way
                    char buff[255];
                    int len = sprintf(buff," : % 8.6g",val); // this is usually ok, and should be 3+8 chars long
                    if (len == 3+8) {
                        std::cout << buff;
                    } else {
                        if (strchr(buff,'e')) {
                            printf((len == 3+13 ? " :  % .0e" : " : % .1e"),val);
                        } else {
                            printf("%11.11s",buff);
                        } 
                    } 
                } catch (std::exception &ex) {
                    printf(" : %8s", "EXCEPT"); 
                    if (!ignoreExceptions_) std::cerr << "Caught exception " << ex.what() << std::endl;
                }
            }
        }
        for (std::vector<reco::parser::SelectorPtr>::const_iterator it = cuts_.begin()+1, ed = cuts_.end(); it != ed; ++it) {
            if (ptr == 0 || it->get() == 0) {
                printf(" : %8s", "#ERR");
            } else {  
                try {
                    int ret = (*it)->operator()(obj);
                    printf(" : %8d", ret);
                } catch (std::exception &ex) {
                    printf(" : %8s", "EXCEPT"); 
                    if (!ignoreExceptions_) std::cerr << "Caught exception " << ex.what() << std::endl;
                }
            }
        }
        fflush(stdout);
    }
}


void
helper::ScannerBase::fill1D(const void *ptr, TH1 *hist) const {
    edm::ObjectWithDict obj(objType_, const_cast<void *>(ptr));
    if ((cuts_[0].get() == 0) || (*cuts_[0])(obj)) {
        try {
            if (!exprs_.empty()) hist->Fill(exprs_[0]->value(obj));
        } catch (std::exception &ex) {
            if (!ignoreExceptions_) std::cerr << "Caught exception " << ex.what() << std::endl;
        }
    }
}

void
helper::ScannerBase::fill2D(const void *ptr, TH2 *hist) const {
    edm::ObjectWithDict obj(objType_, const_cast<void *>(ptr));
    if ((cuts_[0].get() == 0) || (*cuts_[0])(obj)) {
        try {
            if (exprs_.size() >= 2) hist->Fill(exprs_[0]->value(obj), exprs_[1]->value(obj));
        } catch (std::exception &ex) {
            if (!ignoreExceptions_) std::cerr << "Caught exception " << ex.what() << std::endl;
        }
    }
}

void
helper::ScannerBase::fillGraph(const void *ptr, TGraph *graph) const {
    edm::ObjectWithDict obj(objType_, const_cast<void *>(ptr));
    if ((cuts_[0].get() == 0) || (*cuts_[0])(obj)) {
        try {
            if (exprs_.size() >= 2) graph->SetPoint(graph->GetN(), exprs_[0]->value(obj), exprs_[1]->value(obj));
        } catch (std::exception &ex) {
            if (!ignoreExceptions_) std::cerr << "Caught exception " << ex.what() << std::endl;
        }
    }
}


void
helper::ScannerBase::fillProf(const void *ptr, TProfile *hist) const {
    edm::ObjectWithDict obj(objType_, const_cast<void *>(ptr));
    if ((cuts_[0].get() == 0) || (*cuts_[0])(obj)) {
        try {
            if (exprs_.size() >= 2) hist->Fill(exprs_[0]->value(obj), exprs_[1]->value(obj));
        } catch (std::exception &ex) {
            if (!ignoreExceptions_) std::cerr << "Caught exception " << ex.what() << std::endl;
        }
    }
}