rntuple-validation/types/array/read.C at main · root-project/rntuple-validation · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
#include <ROOT/REntry.hxx>
#include <ROOT/RNTupleReader.hxx>

using ROOT::Experimental::REntry;
using ROOT::Experimental::RNTupleReader;

#include <array>
#include <cstdint>
#include <fstream>
#include <ostream>
#include <string>
#include <string_view>
#include <utility>
#include <variant>
#include <vector>

using ArrayInt32 = std::array<std::int32_t, 2>;
using Variant = std::variant<std::int32_t, std::string>;
using VectorInt32 = std::vector<std::int32_t>;

template <typename T> static void PrintValue(const T &value, std::ostream &os);

template <> void PrintValue(const std::int32_t &value, std::ostream &os) {
  os << value;
}

template <> void PrintValue(const std::string &value, std::ostream &os) {
  os << "\"" << value << "\"";
}

template <> void PrintValue(const Variant &value, std::ostream &os) {
  if (value.index() == 0) {
    PrintValue(std::get<std::int32_t>(value), os);
  } else if (value.index() == 1) {
    PrintValue(std::get<std::string>(value), os);
  }
}

template <> void PrintValue(const VectorInt32 &value, std::ostream &os) {
  os << "[";
  bool first = true;
  for (auto element : value) {
    if (first) {
      first = false;
    } else {
      os << ",";
    }
    os << "\n        " << element;
  }
  if (!value.empty()) {
    os << "\n      ";
  }
  os << "]";
}

template <typename T>
static void PrintArrayValue(const REntry &entry, std::string_view name,
                            std::ostream &os, bool last = false) {
  auto &value = *entry.GetPtr<std::array<T, 2>>(name);
  os << "    \"" << name << "\": [";
  bool first = true;
  for (auto &&element : value) {
    if (first) {
      first = false;
    } else {
      os << ",";
    }
    os << "\n      ";
    PrintValue(element, os);
  }
  os << "\n";
  os << "    ]";
  if (!last) {
    os << ",";
  }
  os << "\n";
}

static void PrintArrayArrayValue(const REntry &entry, std::string_view name,
                                 std::ostream &os, bool last = false) {
  auto &value = *entry.GetPtr<std::array<std::array<std::int32_t, 2>, 3>>(name);
  os << "    \"" << name << "\": [";
  bool first = true;
  for (auto &&element : value) {
    if (first) {
      first = false;
    } else {
      os << ",";
    }
    os << "\n      [";
    bool innerFirst = true;
    for (auto &&i : element) {
      if (innerFirst) {
        innerFirst = false;
      } else {
        os << ",";
      }
      os << "\n        " << i;
    }
    os << "\n      ]";
  }
  os << "\n";
  os << "    ]";
  if (!last) {
    os << ",";
  }
  os << "\n";
}

void read(std::string_view input = "types.array.root",
          std::string_view output = "types.array.json") {
  std::ofstream os(std::string{output});
  os << "[\n";

  auto reader = RNTupleReader::Open("ntpl", input);
  auto &entry = reader->GetModel().GetDefaultEntry();
  bool first = true;
  for (auto index : *reader) {
    reader->LoadEntry(index);

    if (first) {
      first = false;
    } else {
      os << ",\n";
    }
    os << "  {\n";

    PrintArrayValue<std::int32_t>(entry, "Array_Int32", os);
    PrintArrayArrayValue(entry, "Array_Array", os);
    PrintArrayValue<std::string>(entry, "Array_String", os);
    PrintArrayValue<Variant>(entry, "Array_Variant", os);
    PrintArrayValue<VectorInt32>(entry, "Array_Vector", os, /*last=*/true);

    os << "  }";
    // Newline is intentionally missing, may need to print a comma before the
    // next entry.
  }
  os << "\n";
  os << "]\n";
}