LHERunInfoProduct.cc

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#include <algorithm>
#include <iterator>
#include <iostream>
#include <iomanip>
#include <sstream>
#include <string>
#include <cmath>
#include <map>
#include <set>

#include "FWCore/Utilities/interface/Exception.h"

#include "SimDataFormats/GeneratorProducts/interface/LesHouches.h"
#include "SimDataFormats/GeneratorProducts/interface/LHERunInfoProduct.h"

bool LHERunInfoProduct::const_iterator::operator ==
                    (const const_iterator &other) const
{
    if (mode != other.mode)
        return false;

    switch(mode) {
        case kFooter:
        case kDone:
        return true;

        case kHeader:
        return header == other.header;

        case kBody:
        return header == other.header && iter == other.iter;

        case kInit:
        return line == other.line;
    }

    return false;
}

void LHERunInfoProduct::const_iterator::next()
{
    tmp.clear();

    do {
        switch(mode) {
            case kHeader:
            if (header == runInfo->headers_end()) {
                if (line++ == 1)
                    tmp = "</header>\n";
                else {
                    mode = kInit;
                    tmp = "<init>\n";
                    line = 0;
                }
                break;
            } else if (!line) {
                line++;
                tmp = "<header>\n";
                break;
            } else {
                mode = kBody;
                const std::string &tag = header->tag();
                tmp = tag.empty() ? "<!--" :
                      (tag == "<>") ? "" : ("<" + tag + ">");
                iter = header->begin();
                continue;
            }

            case kBody:
            if (iter == header->end()) {
                mode = kHeader;
                const std::string &tag = header->tag();
                tmp += tag.empty() ? "-->" :
                       (tag == "<>") ? "" : ("</" + tag + ">");
                tmp += "\n";
                header++;
            } else {
                tmp += *iter++;
                if (iter == header->end() &&
                    (tmp.empty() ||
                     (tmp[tmp.length() - 1] != '\r' &&
                      tmp[tmp.length() - 1] != '\n')))
                    continue;
            }
            break;

            case kInit: {
            const lhef::HEPRUP &heprup = runInfo->heprup();
            if (!line++) {
                std::ostringstream ss;
                ss << std::setprecision(7)
                   << std::scientific
                   << std::uppercase
                   << "    " << heprup.IDBMUP.first
                   << "  " << heprup.IDBMUP.second
                   << "  " << heprup.EBMUP.first
                   << "  " << heprup.EBMUP.second
                   << "  " << heprup.PDFGUP.first
                   << "  " << heprup.PDFGUP.second
                   << "  " << heprup.PDFSUP.first
                   << "  " << heprup.PDFSUP.second
                   << "  " << heprup.IDWTUP
                   << "  " << heprup.NPRUP << std::endl;
                tmp = ss.str();
                break;
            }
            if (line >= (unsigned int)heprup.NPRUP +
                        runInfo->comments_size() + 2) {
                tmp = "</init>\n";
                mode = kFooter;
                break;
            } else if (line >= (unsigned int)heprup.NPRUP + 2) {
                tmp = *(runInfo->comments_begin() + (line -
                             (unsigned int)heprup.NPRUP - 2));
                break;
            }

            std::ostringstream ss;
            ss << std::setprecision(7)
               << std::scientific
               << std::uppercase
               << "\t" << heprup.XSECUP[line - 2]
               << "\t" << heprup.XERRUP[line - 2]
               << "\t" << heprup.XMAXUP[line - 2]
               << "\t" << heprup.LPRUP[line - 2] << std::endl;
            tmp = ss.str();
            }   break;

            case kFooter:
            mode = kDone;

            default:
            /* ... */;
        }
    } while(false);
}

LHERunInfoProduct::const_iterator LHERunInfoProduct::begin() const
{
    const_iterator result;

    result.runInfo = this;
    result.header = headers_begin();
    result.mode = const_iterator::kHeader;
    result.line = 0;
    result.tmp = "<LesHouchesEvents version=\"1.0\">\n";

    return result;
}

LHERunInfoProduct::const_iterator LHERunInfoProduct::init() const
{
    const_iterator result;

    result.runInfo = this;
    result.mode = const_iterator::kInit;
    result.line = 0;
    result.tmp = "<init>\n";

    return result;
}

const std::string &LHERunInfoProduct::endOfFile()
{
    static const std::string theEnd("</LesHouchesEvents>\n");

    return theEnd;
}

namespace {
    struct XSec {
        inline XSec() : xsec(0.0), err(0.0), max(0.0) {}

        double  xsec;
        double  err;
        double  max;
    };

    struct HeaderLess {
        bool operator() (const LHERunInfoProduct::Header &a,
                         const LHERunInfoProduct::Header &b) const;
    };
}

bool HeaderLess::operator() (const LHERunInfoProduct::Header &a,
                             const LHERunInfoProduct::Header &b) const
{
    if (a == b)
        return false;
    if (a.tag() < b.tag())
        return true;
    if (a.tag() > b.tag())
        return false;

    LHERunInfoProduct::Header::const_iterator iter1 = a.begin();
    LHERunInfoProduct::Header::const_iterator iter2 = b.begin();

    for(; iter1 != a.end() && iter2 != b.end(); ++iter1, ++iter2) {
        if (*iter1 < *iter2)
            return true;
        else if (*iter1 != *iter2)
            return false;
    }

    return iter2 != b.end();
}

bool LHERunInfoProduct::isTagComparedInMerge(const std::string& tag) {
    return !(tag == "" || tag.find("Alpgen") == 0 || tag == "MGGridCard" || tag == "MGGenerationInfo");
}

bool LHERunInfoProduct::mergeProduct(const LHERunInfoProduct &other)
{
    if (heprup_.IDBMUP != other.heprup_.IDBMUP ||
        heprup_.EBMUP != other.heprup_.EBMUP ||
        heprup_.PDFGUP != other.heprup_.PDFGUP ||
        heprup_.PDFSUP != other.heprup_.PDFSUP ||
        heprup_.IDWTUP != other.heprup_.IDWTUP) {
        throw cms::Exception("ProductsNotMergeable")
            << "Error in LHERunInfoProduct: LHE headers differ. "
               "Cannot merge products." << std::endl;
    }

    bool compatibleHeaders = headers_ == other.headers_;

    // try to merge different, but compatible headers
    while(!compatibleHeaders) {
        // okay, something is different.
        // Let's try to merge, but don't duplicate identical headers
        // and test the rest against a whitelist

        std::set<Header, HeaderLess> headers;
        std::copy(headers_begin(), headers_end(),
                  std::inserter(headers, headers.begin()));

        bool failed = false;
        for(std::vector<LHERunInfoProduct::Header>::const_iterator
                    header = other.headers_begin();
            header != other.headers_end(); ++header) {
            if (headers.count(*header)) {
                continue;
            }

            if(isTagComparedInMerge(header->tag())) {
                failed = true;
            } else {
                addHeader(*header); 
                headers.insert(*header);
            }
        }
        if (failed) {
            break;
        }

        compatibleHeaders = true;
    }

    // still not compatible after fixups
    if (!compatibleHeaders) {
        throw cms::Exception("ProductsNotMergeable")
            << "Error in LHERunInfoProduct: LHE headers differ. "
               "Cannot merge products." << std::endl;
    }

    // it is exactly the same, so merge
    if (heprup_ == other.heprup_)
        return true;

    // the input files are different ones, presumably generation
    // of the same process in different runs with identical run number
    // attempt merge of processes and cross-sections

    std::map<int, XSec> processes;

    for(int i = 0; i < heprup_.NPRUP; i++) {
        int id = heprup_.LPRUP[i];
        XSec &x = processes[id];
        x.xsec = heprup_.XSECUP[i];
        x.err = heprup_.XERRUP[i];
        x.max = heprup_.XMAXUP[i];
    }

    for(int i = 0; i < other.heprup_.NPRUP; i++) {
        int id = other.heprup_.LPRUP[i];
        XSec &x = processes[id];
        if (x.xsec) {
            double wgt1 = 1.0 / (x.err * x.err);
            double wgt2 = 1.0 / (other.heprup_.XERRUP[i] *
                                 other.heprup_.XERRUP[i]);
            x.xsec = (wgt1 * x.xsec +
                      wgt2 * other.heprup_.XSECUP[i]) /
                     (wgt1 + wgt2);
            x.err = 1.0 / std::sqrt(wgt1 + wgt2);
            x.max = std::max(x.max, other.heprup_.XMAXUP[i]);
        } else {
            x.xsec = other.heprup_.XSECUP[i];
            x.err = other.heprup_.XERRUP[i];
            x.max = other.heprup_.XMAXUP[i];
        }
    }

    heprup_.resize(processes.size());
    unsigned int i = 0;
    for(std::map<int, XSec>::const_iterator iter = processes.begin();
        iter != processes.end(); ++iter, i++) {
        heprup_.LPRUP[i] = iter->first;
        heprup_.XSECUP[i] = iter->second.xsec;
        heprup_.XERRUP[i] = iter->second.err;
        heprup_.XMAXUP[i] = iter->second.max;
    }

    return true;
}