minecart_track_source.h

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#ifndef YAZE_APP_EDITOR_DUNGEON_MINECART_TRACK_SOURCE_H_
#define YAZE_APP_EDITOR_DUNGEON_MINECART_TRACK_SOURCE_H_
 
#include <array>
#include <cstddef>
#include <string>
#include <vector>
 
#include "absl/status/statusor.h"
 
namespace yaze::editor {
 
inline constexpr size_t kMinecartTrackSlotCount = 32;
 
struct MinecartTrack {
  int id;
  int room_id;
  int start_x;
  int start_y;
 
  bool operator==(const MinecartTrack&) const = default;
};
 
struct MinecartTrackSourceTokenSpan {
  size_t offset = 0;
  size_t length = 0;
 
  bool operator==(const MinecartTrackSourceTokenSpan&) const = default;
};
 
// Losslessly models the three minecart `dw` tables. Parsing retains the exact
// source bytes and the spans of only the active table tokens. Rendering can
// therefore replace edited `$hhhh` operands without reconstructing comments,
// whitespace, guard directives, or the guarded disabled branches.
class MinecartTrackSourceDocument {
 public:
  using FieldTokenSpans =
      std::array<MinecartTrackSourceTokenSpan, kMinecartTrackSlotCount>;
  using EditableTokenSpans = std::array<FieldTokenSpans, 3>;
 
  static absl::StatusOr<MinecartTrackSourceDocument> Parse(
      std::string source_bytes);
 
  absl::StatusOr<std::string> Render(
      const std::vector<MinecartTrack>& tracks) const;
 
  [[nodiscard]] const std::string& source_bytes() const {
    return source_bytes_;
  }
  [[nodiscard]] const std::vector<MinecartTrack>& tracks() const {
    return tracks_;
  }
  [[nodiscard]] const EditableTokenSpans& editable_token_spans() const {
    return editable_token_spans_;
  }
  [[nodiscard]] bool guarded() const { return guarded_; }
 
 private:
  std::string source_bytes_;
  std::vector<MinecartTrack> tracks_;
  EditableTokenSpans editable_token_spans_{};
  bool guarded_ = false;
};
 
}  // namespace yaze::editor
 
#endif  // YAZE_APP_EDITOR_DUNGEON_MINECART_TRACK_SOURCE_H_