aboutsummaryrefslogtreecommitdiff
path: root/include/openvic-dataloader/csv/LineObject.hpp
blob: 8a9c2ec9244fdfde285347b4587fb6dfc1d7548b (plain) (blame)
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
#pragma once

#include <cstddef>
#include <cstdint>
#include <functional>
#include <initializer_list>
#include <optional>
#include <string>
#include <string_view>
#include <tuple>
#include <vector>

#include <openvic-dataloader/detail/VectorConstexpr.hpp>

namespace ovdl::csv {
   /// LineObject should be able to recognize the differences between:
   ///   Input -> Indexes == ""
   /// ;;a;b;c;; -> 0,1,5,6+ == ""
   /// a;b;c -> 3+ == ""
   /// a;;b;c;; -> 1,4,5+ == ""
   /// a;b;;c; -> 2,4+ == ""
   /// a;b;c;; -> 3,4+ == ""
   /// a;b;c; -> 3+ == ""
   /// ;a;b;c -> 0,4+ == ""
   ///
   /// If this is incorrect, please report an issue.
   class LineObject final : public std::vector<std::tuple<std::uint32_t, std::string>> {
   public:
      // Stored position of value
      using position_type = std::uint32_t;
      // Value
      using inner_value_type = std::string;
      using container_type = std::vector<std::tuple<position_type, inner_value_type>>;

      OVDL_VECTOR_CONSTEXPR LineObject() = default;
      OVDL_VECTOR_CONSTEXPR LineObject(LineObject&) = default;
      OVDL_VECTOR_CONSTEXPR LineObject(LineObject&&) = default;
      OVDL_VECTOR_CONSTEXPR LineObject(const LineObject&) = default;

      OVDL_VECTOR_CONSTEXPR LineObject& operator=(const LineObject& other) = default;
      OVDL_VECTOR_CONSTEXPR LineObject& operator=(LineObject&& other) = default;

      OVDL_VECTOR_CONSTEXPR ~LineObject() = default;

      OVDL_VECTOR_CONSTEXPR LineObject(std::initializer_list<value_type> pos_and_val) : container_type(pos_and_val) {
      }

      OVDL_VECTOR_CONSTEXPR LineObject(position_type prefix_end, std::initializer_list<value_type> pos_and_val, position_type suffix_end = 0)
         : container_type(pos_and_val),
           _prefix_end(prefix_end),
           _suffix_end(suffix_end) {
      }

      /// Special Functionality
      /// Retrieves value, produces "" for empty values
      constexpr std::string_view get_value_for(std::size_t position) const {
         if (position <= _prefix_end || position >= _suffix_end) return "";
         for (const auto& [pos, val] : *this) {
            if (pos == position) return val;
         }
         return "";
      }
      /// Tries to retrieve reference, produces nullopt for empty values
      constexpr std::optional<const std::reference_wrapper<const std::string>> try_get_string_at(std::size_t position) const {
         if (position <= _prefix_end || position > _suffix_end) return std::nullopt;
         for (const auto& [pos, val] : *this) {
            if (pos == position) return std::cref(val);
         }
         return std::nullopt;
      }

      constexpr position_type prefix_end() const { return _prefix_end; }
      constexpr void set_prefix_end(position_type value) { _prefix_end = value; }

      constexpr position_type suffix_end() const { return _suffix_end; }
      constexpr void set_suffix_end(position_type value) { _suffix_end = value; }

      constexpr std::size_t value_count() const { return _suffix_end; }

   private:
      // Should be position of first valid value on line
      position_type _prefix_end = 0;
      // Should be position after last value or position after last seperator
      position_type _suffix_end = 0;
   };
}