HepMC3 event record library
ReaderHEPEVT.cc
Go to the documentation of this file.
1// -*- C++ -*-
2//
3// This file is part of HepMC
4// Copyright (C) 2014-2021 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#include "HepMC3/ReaderHEPEVT.h"
13
14namespace HepMC3
15{
16
17ReaderHEPEVT::ReaderHEPEVT(const std::string &filename)
18 : m_file(filename), m_stream(0), m_isstream(false)
19{
20 if ( !m_file.is_open() ) {
21 HEPMC3_ERROR("ReaderHEPEVT: could not open input file: " << filename)
22 }
23 else
24 {
25 set_run_info(std::make_shared<GenRunInfo>());
27
28 }
29}
30
31ReaderHEPEVT::ReaderHEPEVT(std::istream & stream)
32 : m_stream(&stream), m_isstream(true)
33{
34 if ( !m_stream->good() ) {
35 HEPMC3_ERROR("ReaderHEPEVT: could not open input stream ")
36 }
37 else
38 {
39 set_run_info(std::make_shared<GenRunInfo>());
41 }
42}
43
44ReaderHEPEVT::ReaderHEPEVT(std::shared_ptr<std::istream> s_stream)
45 : m_shared_stream(s_stream), m_stream(s_stream.get()), m_isstream(true)
46{
47 if ( !m_stream->good() ) {
48 HEPMC3_ERROR("ReaderHEPEVT: could not open input stream ")
49 }
50 else
51 {
52 set_run_info(std::make_shared<GenRunInfo>());
54 }
55}
56
57
58bool ReaderHEPEVT::skip(const int n)
59{
60 const size_t max_buffer_size = 512*512;
61 char buf[max_buffer_size];
62 int nn = n;
63 while (!failed()) {
64 char peek;
65 if ( (!m_file.is_open()) && (!m_isstream) ) return false;
66 m_isstream ? peek = m_stream->peek() : peek = m_file.peek();
67 if ( peek == 'E' ) nn--;
68 if ( nn < 0 ) return true;
69 m_isstream ? m_stream->getline(buf, max_buffer_size) : m_file.getline(buf, max_buffer_size);
70 }
71 return true;
72}
73
74
75
77{
78 const size_t max_e_buffer_size = 512;
79 char buf_e[max_e_buffer_size];
80 bool eventline = false;
81 int m_i = 0, m_p = 0;
82 while (!eventline)
83 {
84 m_isstream ? m_stream->getline(buf_e, max_e_buffer_size) : m_file.getline(buf_e, max_e_buffer_size);
85 if ( strlen(buf_e) == 0 ) return false;
86 std::stringstream st_e(buf_e);
87 char attr = ' ';
88 eventline = false;
89 while (!eventline)
90 {
91 if (!(st_e >> attr)) break;
92 if (attr == ' ') continue;
93 else eventline = false;
94 if (attr == 'E')
95 {
96 eventline = static_cast<bool>(st_e >> m_i >> m_p);
97 }
98 }
99 }
102 return eventline;
103}
104
105
107{
108 const size_t max_p_buffer_size = 512;
109 const size_t max_v_buffer_size = 512;
110 char buf_p[max_p_buffer_size];
111 char buf_v[max_v_buffer_size];
112 int intcodes[6];
113 double fltcodes1[5];
114 double fltcodes2[4];
115 m_isstream ? m_stream->getline(buf_p, max_p_buffer_size) : m_file.getline(buf_p, max_p_buffer_size);
116 if ( strlen(buf_p) == 0 ) return false;
117 if (m_options.find("vertices_positions_are_absent") == m_options.end())
118 {
119 m_isstream ? m_stream->getline(buf_v, max_v_buffer_size) : m_file.getline(buf_v, max_v_buffer_size);
120 if ( strlen(buf_v) == 0 ) return false;
121 }
122 std::stringstream st_p(buf_p);
123 std::stringstream st_v(buf_v);
124 if (m_options.find("vertices_positions_are_absent") == m_options.end())
125 {
126 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;}
127 if (!static_cast<bool>(st_v >> fltcodes2[0] >> fltcodes2[1] >> fltcodes2[2] >> fltcodes2[3])) { HEPMC3_ERROR("ReaderHEPEVT: HEPMC3_ERROR reading particle vertex"); return false;}
128 }
129 else
130 {
131 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;}
132 intcodes[2] = 0;//FIXME! This is a feature of this format, but maybe there are better ideas.
133 intcodes[3] = 0;//FIXME! This is a feature of this format, but maybe there are better ideas.
134 fltcodes1[3] = std::sqrt(fltcodes1[0]*fltcodes1[0]+fltcodes1[1]*fltcodes1[1]+fltcodes1[2]*fltcodes1[2]+fltcodes1[4]*fltcodes1[4]);
135 fltcodes2[0] = 0;
136 fltcodes2[1] = 0;
137 fltcodes2[2] = 0;
138 fltcodes2[3] = 0;
139 }
140 m_hepevt_interface.set_status(i, intcodes[0]);
141 m_hepevt_interface.set_id(i, intcodes[1]);
142 m_hepevt_interface.set_parents(i, intcodes[2], std::max(intcodes[2], intcodes[3]));/* Pythia writes second mother 0*/
143 m_hepevt_interface.set_children(i, intcodes[4], intcodes[5]);
144 m_hepevt_interface.set_momentum(i, fltcodes1[0], fltcodes1[1], fltcodes1[2], fltcodes1[3]);
145 m_hepevt_interface.set_mass(i, fltcodes1[4]);
146 m_hepevt_interface.set_position(i, fltcodes2[0], fltcodes2[1], fltcodes2[2], fltcodes2[3]);
147 return true;
148}
149
151{
152 evt.clear();
154 bool fileok = read_hepevt_event_header();
155 for (int i = 1; (i <= m_hepevt_interface.number_entries()) && fileok; i++)
156 fileok = read_hepevt_particle(i);
157 bool result = false;
158 if (fileok)
159 {
161 std::shared_ptr<GenRunInfo> g = std::make_shared<GenRunInfo>();
162 std::vector<std::string> weightnames;
163 weightnames.push_back("0");
164 std::vector<double> wts;
165 wts.push_back(1.0);
166 g->set_weight_names(weightnames);
167 evt.set_run_info(g);
168 evt.weights() = wts;
169 }
170 else
171 {
172 m_isstream ? m_stream->clear(std::ios::badbit) : m_file.clear(std::ios::badbit);
173 }
174 return result;
175}
176
178{
179 if ( !m_file.is_open()) return;
180 m_file.close();
181}
182
184{
185 return m_isstream ? (bool)m_stream->rdstate() :(bool)m_file.rdstate();
186}
187
188} // namespace HepMC3
#define HEPMC3_ERROR(MESSAGE)
Macro for printing error messages.
Definition: Errors.h:24
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:141
const std::vector< double > & weights() const
Get event weight values as a vector.
Definition: GenEvent.h:98
void clear()
Remove contents of this event.
Definition: GenEvent.cc:599
void set_id(const int index, const int id)
Set PDG particle id.
bool HEPEVT_to_GenEvent(GenEvent *evt) const
Convert HEPEVT to GenEvent.
void allocate_internal_storage()
Allocates m_internal_storage storage in smart pointer to hold HEPEVT of fixed size.
void zero_everything()
Set all entries in HEPEVT to zero.
void set_parents(const int index, const int firstparent, const int lastparent)
Set parents.
void set_momentum(const int index, const double px, const double py, const double pz, const double e)
Set 4-momentum.
void set_children(const int index, const int firstchild, const int lastchild)
Set children.
void set_position(const int index, const double x, const double y, const double z, const double t)
Set position in time-space.
int number_entries() const
Get number of entries.
void set_mass(const int index, double mass)
Set mass.
void set_event_number(const int evtno)
Set event number.
void set_status(const int index, const int status)
Set status code.
void set_number_entries(const int noentries)
Set number of entries.
bool m_isstream
toggles usage of m_file or m_stream
Definition: ReaderHEPEVT.h:77
bool read_event(GenEvent &evt) override
Read event from file.
ReaderHEPEVT(const std::string &filename)
Default constructor.
Definition: ReaderHEPEVT.cc:17
HEPEVT_Wrapper_Template< 100000 > m_hepevt_interface
Templated HEPEVT interface.
Definition: ReaderHEPEVT.h:78
bool failed() override
Get stream error state.
bool skip(const int) override
skip events
Definition: ReaderHEPEVT.cc:58
std::ifstream m_file
Input file.
Definition: ReaderHEPEVT.h:74
virtual bool read_hepevt_particle(int i)
read particle from file
virtual bool read_hepevt_event_header()
Find and read event header line from file.
Definition: ReaderHEPEVT.cc:76
void close() override
Close file stream.
std::istream * m_stream
For ctor when reading from stream.
Definition: ReaderHEPEVT.h:76
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.