HepMC3 event record library
ReaderHEPEVT.cc
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1// -*- C++ -*-
2//
3// This file is part of HepMC
4// Copyright (C) 2014-2020 The HepMC collaboration (see AUTHORS for details)
5//
6/**
7 * @file ReaderHEPEVT.cc
8 * @brief Implementation of \b class ReaderHEPEVT
9 *
10 */
11#include <sstream>
12
13#include "HepMC3/ReaderHEPEVT.h"
15
16
17namespace HepMC3
18{
19
20ReaderHEPEVT::ReaderHEPEVT(const std::string &filename)
21 : m_file(filename), m_stream(0), m_isstream(false)
22{
23 if ( !m_file.is_open() ) {
24 HEPMC3_ERROR("ReaderHEPEVT: could not open input file: " << filename)
25 }
26 else
27 {
28 set_run_info(std::make_shared<GenRunInfo>());
29 set_run_info(std::make_shared<GenRunInfo>());
30 hepevtbuffer = (char*)(new struct HEPEVT());
32 }
33}
34
35ReaderHEPEVT::ReaderHEPEVT(std::istream & stream)
36 : m_stream(&stream), m_isstream(true)
37{
38 if ( !m_stream->good() ) {
39 HEPMC3_ERROR("ReaderHEPEVT: could not open input stream ")
40 }
41 else
42 {
43 set_run_info(std::make_shared<GenRunInfo>());
44 hepevtbuffer = (char*)(new struct HEPEVT());
46 }
47}
48
49bool ReaderHEPEVT::skip(const int n)
50{
51 const size_t max_buffer_size = 512*512;
52 char buf[max_buffer_size];
53 int nn = n;
54 while (!failed()) {
55 char peek;
56 if ( (!m_file.is_open()) && (!m_isstream) ) return false;
57 m_isstream ? peek = m_stream->peek() : peek = m_file.peek();
58 if ( peek == 'E' ) nn--;
59 if ( nn < 0 ) return true;
60 m_isstream ? m_stream->getline(buf, max_buffer_size) : m_file.getline(buf, max_buffer_size);
61 }
62 return true;
63}
64
65
66
68{
69 const size_t max_e_buffer_size = 512;
70 char buf_e[max_e_buffer_size];
71 bool eventline = false;
72 int m_i = 0, m_p = 0;
73 while (!eventline)
74 {
75 m_isstream ? m_stream->getline(buf_e, max_e_buffer_size) : m_file.getline(buf_e, max_e_buffer_size);
76 if ( strlen(buf_e) == 0 ) return false;
77 std::stringstream st_e(buf_e);
78 char attr = ' ';
79 eventline = false;
80 while (!eventline)
81 {
82 if (!(st_e >> attr)) break;
83 if (attr == ' ') continue;
84 else eventline = false;
85 if (attr == 'E')
86 {
87 eventline = static_cast<bool>(st_e >> m_i >> m_p);
88 }
89 }
90 }
93 return eventline;
94}
95
96
98{
99 const size_t max_p_buffer_size = 512;
100 const size_t max_v_buffer_size = 512;
101 char buf_p[max_p_buffer_size];
102 char buf_v[max_v_buffer_size];
103 int intcodes[6];
104 double fltcodes1[5];
105 double fltcodes2[4];
106 m_isstream ? m_stream->getline(buf_p, max_p_buffer_size) : m_file.getline(buf_p, max_p_buffer_size);
107 if ( strlen(buf_p) == 0 ) return false;
108 if (m_options.find("vertices_positions_are_absent") == m_options.end())
109 {
110 m_isstream ? m_stream->getline(buf_v, max_v_buffer_size) : m_file.getline(buf_v, max_v_buffer_size);
111 if ( strlen(buf_v) == 0 ) return false;
112 }
113 std::stringstream st_p(buf_p);
114 std::stringstream st_v(buf_v);
115 if (m_options.find("vertices_positions_are_absent") == m_options.end())
116 {
117 if (!static_cast<bool>(st_p >> intcodes[0] >> intcodes[1] >> intcodes[2] >> intcodes[3] >> intcodes[4] >> intcodes[5] >> fltcodes1[0] >> fltcodes1[1] >> fltcodes1[2] >> fltcodes1[3] >> fltcodes1[4])) { HEPMC3_ERROR("ReaderHEPEVT: HEPMC3_ERROR reading particle momenta"); return false;}
118 if (!static_cast<bool>(st_v >> fltcodes2[0] >> fltcodes2[1] >> fltcodes2[2] >> fltcodes2[3])) { HEPMC3_ERROR("ReaderHEPEVT: HEPMC3_ERROR reading particle vertex"); return false;}
119 }
120 else
121 {
122 if (!static_cast<bool>(st_p>> intcodes[0]>> intcodes[1] >> intcodes[4] >> intcodes[5] >> fltcodes1[0] >> fltcodes1[1] >> fltcodes1[2] >> fltcodes1[4])) {HEPMC3_ERROR("ReaderHEPEVT: HEPMC3_ERROR reading particle momenta"); return false;}
123 intcodes[2] = 0;//FIXME! This is a feature of this format, but maybe there are better ideas.
124 intcodes[3] = 0;//FIXME! This is a feature of this format, but maybe there are better ideas.
125 fltcodes1[3] = std::sqrt(fltcodes1[0]*fltcodes1[0]+fltcodes1[1]*fltcodes1[1]+fltcodes1[2]*fltcodes1[2]+fltcodes1[4]*fltcodes1[4]);
126 fltcodes2[0] = 0;
127 fltcodes2[1] = 0;
128 fltcodes2[2] = 0;
129 fltcodes2[3] = 0;
130 }
131 HEPEVT_Wrapper::set_status(i, intcodes[0]);
132 HEPEVT_Wrapper::set_id(i, intcodes[1]);
133 HEPEVT_Wrapper::set_parents(i, intcodes[2], std::max(intcodes[2], intcodes[3]));/* Pythia writes second mother 0*/
134 HEPEVT_Wrapper::set_children(i, intcodes[4], intcodes[5]);
135 HEPEVT_Wrapper::set_momentum(i, fltcodes1[0], fltcodes1[1], fltcodes1[2], fltcodes1[3]);
136 HEPEVT_Wrapper::set_mass(i, fltcodes1[4]);
137 HEPEVT_Wrapper::set_position(i, fltcodes2[0], fltcodes2[1], fltcodes2[2], fltcodes2[3]);
138 return true;
139}
140
142{
143 evt.clear();
145 bool fileok = read_hepevt_event_header();
146 for (int i = 1; (i <= HEPEVT_Wrapper::number_entries()) && fileok; i++)
147 fileok = read_hepevt_particle(i);
148 bool result = false;
149 if (fileok)
150 {
152 std::shared_ptr<GenRunInfo> g = std::make_shared<GenRunInfo>();
153 std::vector<std::string> weightnames;
154 weightnames.push_back("0");
155 std::vector<double> wts;
156 wts.push_back(1.0);
157 g->set_weight_names(weightnames);
158 evt.set_run_info(g);
159 evt.weights() = wts;
160 }
161 else
162 {
163 m_isstream ? m_stream->clear(std::ios::badbit) : m_file.clear(std::ios::badbit);
164 }
165 return result;
166}
167
169{
170 if (hepevtbuffer) delete hepevtbuffer;
171 if ( !m_file.is_open()) return;
172 m_file.close();
173}
174
176{
177 return m_isstream ? (bool)m_stream->rdstate() :(bool)m_file.rdstate();
178}
179
180} // namespace HepMC3
#define HEPMC3_ERROR(MESSAGE)
Macro for printing error messages.
Definition: Errors.h:24
Definition of class HEPEVT_Wrapper.
Definition of class ReaderHEPEVT.
Stores event-related information.
Definition: GenEvent.h:41
void set_run_info(std::shared_ptr< GenRunInfo > run)
Set the GenRunInfo object by smart pointer.
Definition: GenEvent.h:129
const std::vector< double > & weights() const
Get event weight values as a vector.
Definition: GenEvent.h:86
void clear()
Remove contents of this event.
Definition: GenEvent.cc:599
static void set_mass(const int &index, double mass)
Set mass.
static void set_momentum(const int &index, const double &px, const double &py, const double &pz, const double &e)
Set 4-momentum.
static void set_number_entries(const int &noentries)
Set number of entries.
static void zero_everything()
Check for problems with HEPEVT common block.
static void set_id(const int &index, const int &id)
Set PDG particle id.
static void set_status(const int &index, const int &status)
Set status code.
static void set_hepevt_address(char *c)
Set Fortran block address.
static bool HEPEVT_to_GenEvent(GenEvent *evt)
Convert HEPEVT to GenEvent.
static void set_parents(const int &index, const int &firstparent, const int &lastparent)
Set parents.
static void set_position(const int &index, const double &x, const double &y, const double &z, const double &t)
Set position in time-space.
static void set_children(const int &index, const int &firstchild, const int &lastchild)
Set children.
static int number_entries()
Get number of entries.
static void set_event_number(const int &evtno)
Set event number.
bool m_isstream
toggles usage of m_file or m_stream
Definition: ReaderHEPEVT.h:75
bool read_event(GenEvent &evt) override
Read event from file.
ReaderHEPEVT(const std::string &filename)
Default constructor.
Definition: ReaderHEPEVT.cc:20
bool failed() override
Get stream error state.
bool skip(const int) override
skip events
Definition: ReaderHEPEVT.cc:49
std::ifstream m_file
Input file.
Definition: ReaderHEPEVT.h:73
virtual bool read_hepevt_particle(int i)
read particle from file
Definition: ReaderHEPEVT.cc:97
virtual bool read_hepevt_event_header()
Find and read event header line from file.
Definition: ReaderHEPEVT.cc:67
void close() override
Close file stream.
char * hepevtbuffer
Pointer to HEPEVT Fortran common block/C struct.
Definition: ReaderHEPEVT.h:71
std::istream * m_stream
For ctor when reading from stdin.
Definition: ReaderHEPEVT.h:74
std::map< std::string, std::string > m_options
options
Definition: Reader.h:68
void set_run_info(std::shared_ptr< GenRunInfo > run)
Set the global GenRunInfo object.
Definition: Reader.h:64
HepMC3 main namespace.
Fortran common block HEPEVT.