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limboai/blackboard/blackboard_plan.cpp

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/**
* blackboard_plan.cpp
* =============================================================================
* Copyright 2021-2024 Serhii Snitsaruk
*
* Use of this source code is governed by an MIT-style
* license that can be found in the LICENSE file or at
* https://opensource.org/licenses/MIT.
* =============================================================================
*/
#include "blackboard_plan.h"
#include "../util/limbo_utility.h"
#ifdef LIMBOAI_MODULE
#include "editor/editor_inspector.h"
#include "editor/editor_interface.h"
#elif LIMBOAI_GDEXTENSION
#include <godot_cpp/classes/editor_inspector.hpp>
#include <godot_cpp/classes/editor_interface.hpp>
#include <godot_cpp/classes/engine.hpp>
#include <godot_cpp/classes/scene_tree.hpp>
#endif
bool BlackboardPlan::_set(const StringName &p_name, const Variant &p_value) {
String name_str = p_name;
// * Editor
if (var_map.has(p_name)) {
BBVariable &var = var_map[p_name];
var.set_value(p_value);
if (base.is_valid() && p_value == base->get_var(p_name).get_value()) {
// When user pressed reset property button in inspector...
var.reset_value_changed();
}
return true;
}
// * Mapping
if (name_str.begins_with("mapping/")) {
StringName mapped_var_name = name_str.get_slicec('/', 1);
StringName value = p_value;
bool prop_list_changed = false;
if (value == StringName()) {
if (parent_scope_mapping.has(mapped_var_name)) {
prop_list_changed = true;
parent_scope_mapping.erase(mapped_var_name);
}
} else {
if (!parent_scope_mapping.has(mapped_var_name)) {
prop_list_changed = true;
}
parent_scope_mapping[mapped_var_name] = value;
}
if (prop_list_changed) {
notify_property_list_changed();
}
return true;
}
// * Binding
if (name_str.begins_with("binding/")) {
StringName bound_var = name_str.get_slicec('/', 1);
NodePath value = p_value;
bool prop_list_changed = false;
if (value.is_empty()) {
if (property_bindings.has(bound_var)) {
prop_list_changed = true;
property_bindings.erase(bound_var);
}
} else {
if (!property_bindings.has(bound_var)) {
prop_list_changed = true;
}
property_bindings[bound_var] = value;
}
if (prop_list_changed) {
notify_property_list_changed();
}
}
// * Storage
if (name_str.begins_with("var/")) {
StringName var_name = name_str.get_slicec('/', 1);
String what = name_str.get_slicec('/', 2);
if (!var_map.has(var_name) && what == "name") {
add_var(var_name, BBVariable());
}
if (what == "name") {
// We don't store variable name with the variable.
} else if (what == "type") {
var_map[var_name].set_type((Variant::Type)(int)p_value);
} else if (what == "value") {
var_map[var_name].set_value(p_value);
} else if (what == "hint") {
var_map[var_name].set_hint((PropertyHint)(int)p_value);
} else if (what == "hint_string") {
var_map[var_name].set_hint_string(p_value);
} else if (what == "property_binding") {
property_bindings[var_name] = NodePath(p_value);
} else {
return false;
}
return true;
}
return false;
}
bool BlackboardPlan::_get(const StringName &p_name, Variant &r_ret) const {
String name_str = p_name;
// * Editor
if (var_map.has(p_name)) {
if (has_mapping(p_name)) {
r_ret = "Mapped to " + LimboUtility::get_singleton()->decorate_var(parent_scope_mapping[p_name]);
} else if (has_property_binding(p_name)) {
const NodePath &binding = property_bindings[p_name];
Node *edited_node = Object::cast_to<Node>(EditorInterface::get_singleton()->get_inspector()->get_edited_object());
if (!edited_node) {
edited_node = SCENE_TREE()->get_edited_scene_root();
}
Node *bound_node = edited_node->get_node_or_null(binding);
String shortened_path;
if (bound_node) {
shortened_path = (String)bound_node->get_name() +
":" + (String)binding.get_concatenated_subnames();
} else {
shortened_path = (String)binding.get_name(binding.get_name_count() - 1) +
":" + (String)binding.get_concatenated_subnames();
}
r_ret = String::utf8("🔗 ") + shortened_path;
} else {
r_ret = var_map[p_name].get_value();
}
return true;
}
// * Mapping
if (name_str.begins_with("mapping/")) {
StringName mapped_var_name = name_str.get_slicec('/', 1);
ERR_FAIL_COND_V(mapped_var_name == StringName(), false);
r_ret = parent_scope_mapping.has(mapped_var_name) ? parent_scope_mapping[mapped_var_name] : StringName();
return true;
}
// * Binding
if (name_str.begins_with("binding/")) {
StringName bound_var = name_str.get_slicec('/', 1);
ERR_FAIL_COND_V(bound_var == StringName(), false);
r_ret = property_bindings.has(bound_var) ? property_bindings[bound_var] : NodePath();
return true;
}
// * Storage
if (!name_str.begins_with("var/")) {
return false;
}
StringName var_name = name_str.get_slicec('/', 1);
String what = name_str.get_slicec('/', 2);
ERR_FAIL_COND_V(!var_map.has(var_name), false);
if (what == "name") {
r_ret = var_name;
} else if (what == "type") {
r_ret = var_map[var_name].get_type();
} else if (what == "value") {
r_ret = var_map[var_name].get_value();
} else if (what == "hint") {
r_ret = var_map[var_name].get_hint();
} else if (what == "hint_string") {
r_ret = var_map[var_name].get_hint_string();
}
return true;
}
void BlackboardPlan::_get_property_list(List<PropertyInfo> *p_list) const {
for (const Pair<StringName, BBVariable> &p : var_list) {
String var_name = p.first;
BBVariable var = p.second;
// * Editor
if (var.get_type() != Variant::NIL && (!is_derived() || !var_name.begins_with("_"))) {
if (has_mapping(var_name) || has_property_binding(var_name)) {
p_list->push_back(PropertyInfo(Variant::STRING, var_name, PROPERTY_HINT_NONE, "", PROPERTY_USAGE_EDITOR | PROPERTY_USAGE_READ_ONLY));
} else {
p_list->push_back(PropertyInfo(var.get_type(), var_name, var.get_hint(), var.get_hint_string(), PROPERTY_USAGE_EDITOR));
}
}
// * Storage
if (is_derived() && (!var.is_value_changed() || var.get_value() == base->var_map[var_name].get_value())) {
// Don't store variable if it's not modified in a derived plan.
// Variable is considered modified when it's marked as changed and its value is different from the base plan.
continue;
}
p_list->push_back(PropertyInfo(Variant::STRING, "var/" + var_name + "/name", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR | PROPERTY_USAGE_INTERNAL));
p_list->push_back(PropertyInfo(Variant::INT, "var/" + var_name + "/type", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR | PROPERTY_USAGE_INTERNAL));
p_list->push_back(PropertyInfo(var.get_type(), "var/" + var_name + "/value", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR | PROPERTY_USAGE_INTERNAL));
p_list->push_back(PropertyInfo(Variant::INT, "var/" + var_name + "/hint", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR | PROPERTY_USAGE_INTERNAL));
p_list->push_back(PropertyInfo(Variant::STRING, "var/" + var_name + "/hint_string", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NO_EDITOR | PROPERTY_USAGE_INTERNAL));
}
// * Mapping
if (is_mapping_enabled()) {
p_list->push_back(PropertyInfo(Variant::NIL, "Mapping", PROPERTY_HINT_NONE, "mapping/", PROPERTY_USAGE_GROUP));
for (const Pair<StringName, BBVariable> &p : var_list) {
// Serialize only non-empty mappings.
PropertyUsageFlags usage = has_mapping(p.first) ? PROPERTY_USAGE_DEFAULT : PROPERTY_USAGE_EDITOR;
p_list->push_back(PropertyInfo(Variant::STRING_NAME, "mapping/" + p.first, PROPERTY_HINT_NONE, "", usage));
}
}
// * Binding
p_list->push_back(PropertyInfo(Variant::NIL, "Binding", PROPERTY_HINT_NONE, "binding/", PROPERTY_USAGE_GROUP));
for (const Pair<StringName, BBVariable> &p : var_list) {
PropertyUsageFlags usage = has_property_binding(p.first) ? PROPERTY_USAGE_DEFAULT : PROPERTY_USAGE_EDITOR;
// PROPERTY_HINT_LINK is used to signal that NodePath should point to a property.
// Our inspector plugin will know how to handle it.
p_list->push_back(PropertyInfo(Variant::NODE_PATH, "binding/" + p.first, PROPERTY_HINT_LINK, itos(p.second.get_type()), usage));
}
}
bool BlackboardPlan::_property_can_revert(const StringName &p_name) const {
if (String(p_name).begins_with("mapping/")) {
return true;
}
return base.is_valid() && base->var_map.has(p_name);
}
bool BlackboardPlan::_property_get_revert(const StringName &p_name, Variant &r_property) const {
if (String(p_name).begins_with("mapping/")) {
r_property = StringName();
return true;
}
if (base->var_map.has(p_name)) {
r_property = base->var_map[p_name].get_value();
return true;
}
return false;
}
void BlackboardPlan::set_base_plan(const Ref<BlackboardPlan> &p_base) {
if (p_base == this) {
WARN_PRINT_ED("BlackboardPlan: Using same resource for derived blackboard plan is not supported.");
base.unref();
} else {
base = p_base;
}
sync_with_base_plan();
notify_property_list_changed();
}
void BlackboardPlan::set_parent_scope_plan_provider(const Callable &p_parent_scope_plan_provider) {
parent_scope_plan_provider = p_parent_scope_plan_provider;
notify_property_list_changed();
}
bool BlackboardPlan::has_mapping(const StringName &p_name) const {
return is_mapping_enabled() && parent_scope_mapping.has(p_name) && parent_scope_mapping[p_name] != StringName();
}
void BlackboardPlan::set_property_binding(const StringName &p_name, const NodePath &p_path) {
property_bindings[p_name] = p_path;
emit_changed();
}
void BlackboardPlan::set_prefetch_nodepath_vars(bool p_enable) {
prefetch_nodepath_vars = p_enable;
emit_changed();
}
bool BlackboardPlan::is_prefetching_nodepath_vars() const {
if (is_derived()) {
return base->is_prefetching_nodepath_vars();
} else {
return prefetch_nodepath_vars;
}
}
void BlackboardPlan::add_var(const StringName &p_name, const BBVariable &p_var) {
ERR_FAIL_COND(p_name == StringName());
ERR_FAIL_COND(var_map.has(p_name));
var_map.insert(p_name, p_var);
var_list.push_back(Pair<StringName, BBVariable>(p_name, p_var));
notify_property_list_changed();
emit_changed();
}
void BlackboardPlan::remove_var(const StringName &p_name) {
ERR_FAIL_COND(!var_map.has(p_name));
var_list.erase(Pair<StringName, BBVariable>(p_name, var_map[p_name]));
var_map.erase(p_name);
notify_property_list_changed();
emit_changed();
}
BBVariable BlackboardPlan::get_var(const StringName &p_name) {
ERR_FAIL_COND_V(!var_map.has(p_name), BBVariable());
return var_map.get(p_name);
}
Pair<StringName, BBVariable> BlackboardPlan::get_var_by_index(int p_index) {
Pair<StringName, BBVariable> ret;
ERR_FAIL_INDEX_V(p_index, (int)var_map.size(), ret);
return var_list.get(p_index);
}
TypedArray<StringName> BlackboardPlan::list_vars() const {
TypedArray<StringName> ret;
for (const Pair<StringName, BBVariable> &p : var_list) {
ret.append(p.first);
}
return ret;
}
StringName BlackboardPlan::get_var_name(const BBVariable &p_var) const {
for (const Pair<StringName, BBVariable> &p : var_list) {
if (p.second == p_var) {
return p.first;
}
}
return StringName();
}
bool BlackboardPlan::is_valid_var_name(const StringName &p_name) const {
String name_str = p_name;
if (name_str.begins_with("resource_")) {
return false;
}
return name_str.is_valid_identifier() && !var_map.has(p_name);
}
void BlackboardPlan::rename_var(const StringName &p_name, const StringName &p_new_name) {
if (p_name == p_new_name) {
return;
}
ERR_FAIL_COND(!is_valid_var_name(p_new_name));
ERR_FAIL_COND(!var_map.has(p_name));
ERR_FAIL_COND(var_map.has(p_new_name));
BBVariable var = var_map[p_name];
Pair<StringName, BBVariable> new_entry(p_new_name, var);
Pair<StringName, BBVariable> old_entry(p_name, var);
var_list.find(old_entry)->set(new_entry);
var_map.erase(p_name);
var_map.insert(p_new_name, var);
if (parent_scope_mapping.has(p_name)) {
parent_scope_mapping[p_new_name] = parent_scope_mapping[p_name];
parent_scope_mapping.erase(p_name);
}
notify_property_list_changed();
emit_changed();
}
void BlackboardPlan::move_var(int p_index, int p_new_index) {
ERR_FAIL_INDEX(p_index, (int)var_map.size());
ERR_FAIL_INDEX(p_new_index, (int)var_map.size());
if (p_index == p_new_index) {
return;
}
List<Pair<StringName, BBVariable>>::Element *E = var_list.front();
for (int i = 0; i < p_index; i++) {
E = E->next();
}
List<Pair<StringName, BBVariable>>::Element *E2 = var_list.front();
for (int i = 0; i < p_new_index; i++) {
E2 = E2->next();
}
var_list.move_before(E, E2);
if (p_new_index > p_index) {
var_list.move_before(E2, E);
}
notify_property_list_changed();
emit_changed();
}
void BlackboardPlan::sync_with_base_plan() {
if (base.is_null()) {
return;
}
bool changed = false;
// Sync variables with the base plan.
for (const Pair<StringName, BBVariable> &p : base->var_list) {
const StringName &base_name = p.first;
const BBVariable &base_var = p.second;
if (!var_map.has(base_name)) {
add_var(base_name, base_var.duplicate());
changed = true;
continue;
}
BBVariable var = var_map[base_name];
if (!var.is_same_prop_info(base_var)) {
var.copy_prop_info(base_var);
changed = true;
}
if ((!var.is_value_changed() && var.get_value() != base_var.get_value()) ||
(var.get_value().get_type() != base_var.get_type())) {
// Reset value according to base plan.
var.set_value(base_var.get_value());
var.reset_value_changed();
changed = true;
}
}
// Erase variables that do not exist in the base plan.
List<StringName> erase_list;
for (const Pair<StringName, BBVariable> &p : var_list) {
if (!base->has_var(p.first)) {
erase_list.push_back(p.first);
changed = true;
}
}
while (erase_list.size()) {
remove_var(erase_list.front()->get());
erase_list.pop_front();
}
// Sync order of variables.
// Glossary: E - element of current plan, B - element of base plan, F - element of current plan (used for forward search).
ERR_FAIL_COND(base->var_list.size() != var_list.size());
List<Pair<StringName, BBVariable>>::Element *B = base->var_list.front();
for (List<Pair<StringName, BBVariable>>::Element *E = var_list.front(); E; E = E->next()) {
if (E->get().first != B->get().first) {
List<Pair<StringName, BBVariable>>::Element *F = E->next();
while (F) {
if (F->get().first == B->get().first) {
var_list.move_before(F, E);
E = F;
break;
}
F = F->next();
}
}
B = B->next();
}
if (changed) {
notify_property_list_changed();
emit_changed();
}
}
Ref<Blackboard> BlackboardPlan::create_blackboard(Node *p_prefetch_root, const Ref<Blackboard> &p_parent_scope, Node *p_prefetch_root_for_base_plan) {
ERR_FAIL_COND_V(p_prefetch_root == nullptr && prefetch_nodepath_vars, memnew(Blackboard));
Ref<Blackboard> bb = memnew(Blackboard);
bb->set_parent(p_parent_scope);
populate_blackboard(bb, true, p_prefetch_root, p_prefetch_root_for_base_plan);
return bb;
}
void BlackboardPlan::populate_blackboard(const Ref<Blackboard> &p_blackboard, bool overwrite, Node *p_prefetch_root, Node *p_prefetch_root_for_base_plan) {
ERR_FAIL_COND(p_prefetch_root == nullptr && prefetch_nodepath_vars);
ERR_FAIL_COND(p_blackboard.is_null());
for (const Pair<StringName, BBVariable> &p : var_list) {
if (p_blackboard->has_local_var(p.first) && !overwrite) {
#ifdef DEBUG_ENABLED
Variant::Type existing_type = p_blackboard->get_var(p.first).get_type();
Variant::Type planned_type = p.second.get_type();
if (existing_type != planned_type && existing_type != Variant::NIL && planned_type != Variant::NIL && !(existing_type == Variant::OBJECT && planned_type == Variant::NODE_PATH)) {
WARN_PRINT(vformat("BlackboardPlan: Not overwriting %s as it already exists in the blackboard, but it has a different type than planned (%s vs %s). File: %s",
LimboUtility::get_singleton()->decorate_var(p.first), Variant::get_type_name(existing_type), Variant::get_type_name(planned_type), get_path()));
}
#endif
continue;
}
bool is_bound = property_bindings.has(p.first);
bool has_mapping = parent_scope_mapping.has(p.first);
bool do_prefetch = !is_bound && !has_mapping && prefetch_nodepath_vars;
// Add a variable duplicate to the blackboard, optionally with NodePath prefetch.
BBVariable var = p.second.duplicate(true);
if (unlikely(do_prefetch && p.second.get_type() == Variant::NODE_PATH)) {
Node *prefetch_root = !p_prefetch_root_for_base_plan || !is_derived() || is_derived_var_changed(p.first) ? p_prefetch_root : p_prefetch_root_for_base_plan;
Node *n = prefetch_root->get_node_or_null(p.second.get_value());
if (n != nullptr) {
var.set_value(n);
} else {
ERR_PRINT(vformat("BlackboardPlan: Prefetch failed for variable $%s with value: %s", p.first, p.second.get_value()));
var.set_value(Variant());
}
}
p_blackboard->assign_var(p.first, var);
if (has_mapping) {
StringName target_var = parent_scope_mapping[p.first];
if (target_var != StringName()) {
ERR_CONTINUE_MSG(p_blackboard->get_parent() == nullptr, vformat("BlackboardPlan: Cannot link variable %s to parent scope because the parent scope is not set.", LimboUtility::get_singleton()->decorate_var(p.first)));
p_blackboard->link_var(p.first, p_blackboard->get_parent(), target_var);
}
} else if (is_bound) {
// Bind variable to a property of a scene node.
NodePath binding_path = property_bindings[p.first];
ERR_CONTINUE_MSG(binding_path.get_subname_count() != 1, vformat("BlackboardPlan: Can't bind variable %s using property path that contains multiple sub-names: %s", LimboUtility::get_singleton()->decorate_var(p.first), binding_path));
NodePath node_path{ binding_path.get_concatenated_names() };
StringName prop_name = binding_path.get_subname(0);
// TODO: Implement binding for base plan as well.
Node *binding_root = p_prefetch_root;
Node *n = binding_root->get_node_or_null(node_path);
ERR_CONTINUE_MSG(n == nullptr, vformat("BlackboardPlan: Binding failed for variable %s using property path: %s", LimboUtility::get_singleton()->decorate_var(p.first), binding_path));
var.bind(n, prop_name);
}
}
}
void BlackboardPlan::_bind_methods() {
ClassDB::bind_method(D_METHOD("set_prefetch_nodepath_vars", "enable"), &BlackboardPlan::set_prefetch_nodepath_vars);
ClassDB::bind_method(D_METHOD("is_prefetching_nodepath_vars"), &BlackboardPlan::is_prefetching_nodepath_vars);
ClassDB::bind_method(D_METHOD("set_base_plan", "blackboard_plan"), &BlackboardPlan::set_base_plan);
ClassDB::bind_method(D_METHOD("get_base_plan"), &BlackboardPlan::get_base_plan);
ClassDB::bind_method(D_METHOD("is_derived"), &BlackboardPlan::is_derived);
ClassDB::bind_method(D_METHOD("sync_with_base_plan"), &BlackboardPlan::sync_with_base_plan);
ClassDB::bind_method(D_METHOD("set_parent_scope_plan_provider", "callable"), &BlackboardPlan::set_parent_scope_plan_provider);
ClassDB::bind_method(D_METHOD("get_parent_scope_plan_provider"), &BlackboardPlan::get_parent_scope_plan_provider);
ClassDB::bind_method(D_METHOD("create_blackboard", "prefetch_root", "parent_scope", "prefetch_root_for_base_plan"), &BlackboardPlan::create_blackboard, DEFVAL(Ref<Blackboard>()), DEFVAL(Variant()));
ClassDB::bind_method(D_METHOD("populate_blackboard", "blackboard", "overwrite", "prefetch_root", "prefetch_root_for_base_plan"), &BlackboardPlan::populate_blackboard, DEFVAL(Variant()));
// To avoid cluttering the member namespace, we do not export unnecessary properties in this class.
ADD_PROPERTY(PropertyInfo(Variant::BOOL, "prefetch_nodepath_vars", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_STORAGE), "set_prefetch_nodepath_vars", "is_prefetching_nodepath_vars");
}
BlackboardPlan::BlackboardPlan() {
}
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