NOD_socket_items.hh

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#pragma once

 
#include "BLI_string.h"
#include "BLI_string_utils.hh"
 
#include "BKE_node.hh"
#include "BKE_node_runtime.hh"
 
#include "DNA_array_utils.hh"
 
#include "NOD_socket.hh"
 
namespace blender::nodes::socket_items {
 
struct SocketItemsAccessorDefaults {
  static constexpr bool has_single_identifier_str = true;
  static constexpr bool has_name_validation = false;
  static constexpr bool has_custom_initial_name = false;
  static constexpr char unique_name_separator = '.';
};

template<typename T> struct SocketItemsRef {
  T **items;
  int *items_num;
  int *active_index;
};

template<typename Accessor>
inline bNode *find_node_by_item(bNodeTree &ntree, const typename Accessor::ItemT &item)
{
  ntree.ensure_topology_cache();
  for (bNode *node : ntree.nodes_by_type(Accessor::node_idname)) {
    SocketItemsRef array = Accessor::get_items_from_node(*node);
    if (&item >= *array.items && &item < *array.items + *array.items_num) {
      return node;
    }
  }
  return nullptr;
}

template<typename Accessor> inline void destruct_array(bNode &node)
{
  using ItemT = typename Accessor::ItemT;
  SocketItemsRef ref = Accessor::get_items_from_node(node);
  for (const int i : IndexRange(*ref.items_num)) {
    ItemT &item = (*ref.items)[i];
    Accessor::destruct_item(&item);
  }
  MEM_SAFE_FREE(*ref.items);
}

template<typename Accessor> inline void clear(bNode &node)
{
  destruct_array<Accessor>(node);
  SocketItemsRef ref = Accessor::get_items_from_node(node);
  *ref.items_num = 0;
  *ref.active_index = 0;
}

template<typename Accessor> inline void copy_array(const bNode &src_node, bNode &dst_node)
{
  using ItemT = typename Accessor::ItemT;
  SocketItemsRef src_ref = Accessor::get_items_from_node(const_cast<bNode &>(src_node));
  SocketItemsRef dst_ref = Accessor::get_items_from_node(dst_node);
  const int items_num = *src_ref.items_num;
  *dst_ref.items = MEM_calloc_arrayN<ItemT>(items_num, __func__);
  for (const int i : IndexRange(items_num)) {
    Accessor::copy_item((*src_ref.items)[i], (*dst_ref.items)[i]);
  }
}

template<typename Accessor> inline std::string get_validated_name(const StringRef name)
{
  if constexpr (Accessor::has_name_validation) {
    return Accessor::validate_name(name);
  }
  else {
    return name;
  }
}

template<typename Accessor>
inline void set_item_name_and_make_unique(bNode &node,
                                          typename Accessor::ItemT &item,
                                          const char *value)
{
  using ItemT = typename Accessor::ItemT;
  SocketItemsRef array = Accessor::get_items_from_node(node);
  StringRefNull default_name = "Item";
  if constexpr (Accessor::has_type) {
    default_name = *bke::node_static_socket_label(Accessor::get_socket_type(item), 0);
  }
 
  const std::string validated_name = get_validated_name<Accessor>(value);
 
  char unique_name[MAX_NAME + 4];
  STRNCPY(unique_name, validated_name.c_str());
 
  BLI_uniquename_cb(
      [&](const StringRef name) {
        for (ItemT &item_iter : blender::MutableSpan(*array.items, *array.items_num)) {
          if (&item_iter != &item) {
            if (*Accessor::get_name(item_iter) == name) {
              return true;
            }
          }
        }
        return false;
      },
      default_name.c_str(),
      Accessor::unique_name_separator,
      unique_name,
      ARRAY_SIZE(unique_name));
 
  /* The unique name should still be valid. */
  BLI_assert(StringRef(unique_name) == get_validated_name<Accessor>(unique_name));
 
  char **item_name = Accessor::get_name(item);
  MEM_SAFE_FREE(*item_name);
  *item_name = BLI_strdup(unique_name);
}
 
namespace detail {
 
template<typename Accessor> inline typename Accessor::ItemT &add_item_to_array(bNode &node)
{
  using ItemT = typename Accessor::ItemT;
  SocketItemsRef array = Accessor::get_items_from_node(node);
 
  ItemT *old_items = *array.items;
  const int old_items_num = *array.items_num;
  const int new_items_num = old_items_num + 1;
 
  ItemT *new_items = MEM_calloc_arrayN<ItemT>(new_items_num, __func__);
  std::copy_n(old_items, old_items_num, new_items);
  ItemT &new_item = new_items[old_items_num];
 
  MEM_SAFE_FREE(old_items);
  *array.items = new_items;
  *array.items_num = new_items_num;
  if (array.active_index) {
    *array.active_index = old_items_num;
  }
 
  return new_item;
}
 
}  // namespace detail

template<typename Accessor>
inline typename Accessor::ItemT *add_item_with_socket_type_and_name(
    bNode &node, const eNodeSocketDatatype socket_type, const char *name)
{
  using ItemT = typename Accessor::ItemT;
  BLI_assert(Accessor::supports_socket_type(socket_type));
  ItemT &new_item = detail::add_item_to_array<Accessor>(node);
  Accessor::init_with_socket_type_and_name(node, new_item, socket_type, name);
  return &new_item;
}

template<typename Accessor>
inline typename Accessor::ItemT *add_item_with_name(bNode &node, const char *name)
{
  using ItemT = typename Accessor::ItemT;
  ItemT &new_item = detail::add_item_to_array<Accessor>(node);
  Accessor::init_with_name(node, new_item, name);
  return &new_item;
}

template<typename Accessor> inline typename Accessor::ItemT *add_item(bNode &node)
{
  using ItemT = typename Accessor::ItemT;
  ItemT &new_item = detail::add_item_to_array<Accessor>(node);
  Accessor::init(node, new_item);
  return &new_item;
}
 
template<typename Accessor>
inline std::string get_socket_identifier(const typename Accessor::ItemT &item,
                                         const eNodeSocketInOut in_out)
{
  if constexpr (Accessor::has_single_identifier_str) {
    return Accessor::socket_identifier_for_item(item);
  }
  else {
    if (in_out == SOCK_IN) {
      return Accessor::input_socket_identifier_for_item(item);
    }
    return Accessor::output_socket_identifier_for_item(item);
  }
}

template<typename Accessor>
[[nodiscard]] inline bool try_add_item_via_extend_socket(bNodeTree &ntree,
                                                         bNode &extend_node,
                                                         bNodeSocket &extend_socket,
                                                         bNode &storage_node,
                                                         bNodeLink &link)
{
  using ItemT = typename Accessor::ItemT;
  bNodeSocket *src_socket = nullptr;
  if (link.tosock == &extend_socket) {
    src_socket = link.fromsock;
  }
  else if (link.fromsock == &extend_socket) {
    src_socket = link.tosock;
  }
  else {
    return false;
  }
 
  const ItemT *item = nullptr;
  if constexpr (Accessor::has_name && Accessor::has_type) {
    const eNodeSocketDatatype socket_type = eNodeSocketDatatype(src_socket->type);
    if (!Accessor::supports_socket_type(socket_type)) {
      return false;
    }
    std::string name = src_socket->name;
    if constexpr (Accessor::has_custom_initial_name) {
      name = Accessor::custom_initial_name(storage_node, name);
    }
    item = add_item_with_socket_type_and_name<Accessor>(storage_node, socket_type, name.c_str());
  }
  else if constexpr (Accessor::has_name && !Accessor::has_type) {
    item = add_item_with_name<Accessor>(storage_node, src_socket->name);
  }
  else {
    item = add_item<Accessor>(storage_node);
  }
  if (item == nullptr) {
    return false;
  }
 
  update_node_declaration_and_sockets(ntree, extend_node);
  if (extend_socket.is_input()) {
    const std::string item_identifier = get_socket_identifier<Accessor>(*item, SOCK_IN);
    bNodeSocket *new_socket = bke::node_find_socket(extend_node, SOCK_IN, item_identifier.c_str());
    link.tosock = new_socket;
  }
  else {
    const std::string item_identifier = get_socket_identifier<Accessor>(*item, SOCK_OUT);
    bNodeSocket *new_socket = bke::node_find_socket(
        extend_node, SOCK_OUT, item_identifier.c_str());
    link.fromsock = new_socket;
  }
  return true;
}

template<typename Accessor>
[[nodiscard]] inline bool try_add_item_via_any_extend_socket(
    bNodeTree &ntree,
    bNode &extend_node,
    bNode &storage_node,
    bNodeLink &link,
    const std::optional<StringRef> socket_identifier = std::nullopt)
{
  bNodeSocket *possible_extend_socket = nullptr;
  if (link.fromnode == &extend_node) {
    possible_extend_socket = link.fromsock;
  }
  if (link.tonode == &extend_node) {
    possible_extend_socket = link.tosock;
  }
  if (possible_extend_socket == nullptr) {
    return true;
  }
  if (!STREQ(possible_extend_socket->idname, "NodeSocketVirtual")) {
    return true;
  }
  if (socket_identifier.has_value()) {
    if (possible_extend_socket->identifier != socket_identifier) {
      return true;
    }
  }
  return try_add_item_via_extend_socket<Accessor>(
      ntree, extend_node, *possible_extend_socket, storage_node, link);
}
 
}  // namespace blender::nodes::socket_items