BlockCanvas: Implement drag & drop the file from resource FileSystem

addons/block_code/code_generation/block_definition.gd

@@ -3,7 +3,7 @@ extends Resource
 
 const Types = preload("res://addons/block_code/types/types.gd")
 
-const FORMAT_STRING_PATTERN = "\\[(?<out_parameter>[^\\]]+)\\]|\\{(?<in_parameter>[^}]+)\\}|(?<label>[^\\{\\[]+)"
+const FORMAT_STRING_PATTERN = "\\[(?<out_parameter>[^\\]]+)\\]|\\{const (?<const_parameter>[^}]+)\\}|\\{(?!const )(?<in_parameter>[^}]+)\\}|(?<label>[^\\{\\[]+)"
 
 @export var name: StringName
 
@@ -102,6 +102,9 @@ static func parse_display_template(template_string: String):
 		elif regex_match.names.has("out_parameter"):
 			var parameter_string := regex_match.get_string("out_parameter")
 			items.append({"out_parameter": _parse_parameter_format(parameter_string)})
+		elif regex_match.names.has("const_parameter"):
+			var parameter_string := regex_match.get_string("const_parameter")
+			items.append({"const_parameter": _parse_parameter_format(parameter_string)})
 	return items
 
 

addons/block_code/code_generation/blocks_catalog.gd

@@ -302,3 +302,20 @@ static func get_property_setter_block_definition(variable: VariableDefinition) -
 	var block_def := get_variable_setter_block_definition(variable)
 	block_def.description = "Set the %s property" % variable.var_name
 	return block_def
+
+
+static func get_resource_block_definition(file_path: String) -> BlockDefinition:
+	var block_def := BlockDefinition.new()
+	var file_name = file_path.get_file()
+
+	# Block Definition's name cannot work with '.'
+	block_def.name = &"get_resource_file_path"
+	block_def.description = "The full resource path of '%s'" % file_name
+	block_def.category = "Variables"
+	block_def.type = Types.BlockType.VALUE
+	block_def.variant_type = TYPE_STRING
+	block_def.display_template = "%s {const file_path: STRING}" % file_name
+	block_def.code_template = "{file_path}"
+	block_def.defaults = {"file_path": file_path}
+
+	return block_def

addons/block_code/serialization/block_script_serialization.gd

@@ -72,7 +72,7 @@ func instantiate_block(block_definition: BlockDefinition) -> Block:
 
 
 func instantiate_block_by_name(block_name: String) -> Block:
-	var block_definition := get_block_definition(block_name)
+	var block_definition := get_block_definition(block_name, {})
 
 	if block_definition == null:
 		push_warning("Cannot find a block definition for %s" % block_name)
@@ -81,12 +81,14 @@ func instantiate_block_by_name(block_name: String) -> Block:
 	return instantiate_block(block_definition)
 
 
-func get_block_definition(block_name: String) -> BlockDefinition:
+func get_block_definition(block_name: String, arguments: Dictionary) -> BlockDefinition:
 	var split := block_name.split(":", true, 1)
 	var block_definition: BlockDefinition
 
 	if len(split) > 1:
-		return _get_parameter_block_definition(split[0], split[1])
+		block_definition = _get_parameter_block_definition(split[0], split[1])
+		if block_definition:
+			return block_definition
 
 	block_definition = _get_base_block_definition(block_name)
 	if block_definition != null:
@@ -96,6 +98,11 @@ func get_block_definition(block_name: String) -> BlockDefinition:
 	if block_definition != null:
 		return block_definition
 
+	var file_path = arguments.get("file_path", "")
+	block_definition = _get_resource_block_definition(block_name, file_path)
+	if block_definition != null:
+		return block_definition
+
 	# FIXME: This is a workaround for old-style output block references.
 	#        These were generated ahead of time using a block name that has
 	#        a "_" before the parameter name. Now, these parameter blocks
@@ -182,6 +189,16 @@ func _get_parent_node_property_info(property_name: String) -> Dictionary:
 	return {}
 
 
+func _get_resource_block_definition(block_name: String, file_path: String) -> BlockDefinition:
+	if block_name != "get_resource_file_path":
+		return null
+
+	if file_path.is_empty() or not FileAccess.file_exists(file_path) or not ResourceLoader.exists(file_path):
+		return null
+
+	return BlocksCatalog.get_resource_block_definition(file_path)
+
+
 func _update_block_definitions():
 	_available_blocks.clear()
 	_available_blocks.append_array(_get_inherited_block_definitions())
@@ -251,14 +268,15 @@ func _tree_to_ast(tree: BlockSerializationTree) -> BlockAST:
 
 func _block_to_ast_node(node: BlockSerialization) -> BlockAST.ASTNode:
 	var ast_node := BlockAST.ASTNode.new()
-	ast_node.data = get_block_definition(node.name)
 
 	for arg_name in node.arguments:
 		var argument = node.arguments[arg_name]
 		if argument is ValueBlockSerialization:
 			argument = _value_to_ast_value(argument)
 		ast_node.arguments[arg_name] = argument
 
+	ast_node.data = get_block_definition(node.name, ast_node.arguments)
+
 	var children: Array[BlockAST.ASTNode]
 	for c in node.children:
 		children.append(_block_to_ast_node(c))
@@ -269,14 +287,15 @@ func _block_to_ast_node(node: BlockSerialization) -> BlockAST.ASTNode:
 
 func _value_to_ast_value(value_node: ValueBlockSerialization) -> BlockAST.ASTValueNode:
 	var ast_value_node := BlockAST.ASTValueNode.new()
-	ast_value_node.data = get_block_definition(value_node.name)
 
 	for arg_name in value_node.arguments:
 		var argument = value_node.arguments[arg_name]
 		if argument is ValueBlockSerialization:
 			argument = _value_to_ast_value(argument)
 		ast_value_node.arguments[arg_name] = argument
 
+	ast_value_node.data = get_block_definition(value_node.name, ast_value_node.arguments)
+
 	return ast_value_node
 
 

addons/block_code/ui/block_canvas/block_canvas.gd

@@ -87,6 +87,10 @@ func _can_drop_data(at_position: Vector2, data: Variant) -> bool:
 			return false
 		return true
 
+	# Allow dropping resource file
+	if data.get("type", "") == "files":
+		return true
+
 	var nodes: Array = data.get("nodes", [])
 	if nodes.size() != 1:
 		return false
@@ -108,6 +112,8 @@ func _drop_data(at_position: Vector2, data: Variant) -> void:
 		_drop_node(at_position, data)
 	elif data["type"] == "obj_property":
 		_drop_obj_property(at_position, data)
+	elif data["type"] == "files":
+		_drop_files(at_position, data)
 
 
 func _drop_node(at_position: Vector2, data: Variant) -> void:
@@ -148,6 +154,23 @@ func _drop_obj_property(at_position: Vector2, data: Variant) -> void:
 	reconnect_block.emit(block)
 
 
+func _drop_files(at_position: Vector2, data: Variant) -> void:
+	var resource_files = data["files"]
+	var next_position = at_position
+	const bias = 20
+
+	for file_path in resource_files:
+		# Prepare a Variable block getting the file's resource path.
+		var block_definition = BlocksCatalog.get_resource_block_definition(file_path)
+		var block = _context.block_script.instantiate_block(block_definition)
+		add_block(block, next_position)
+		reconnect_block.emit(block)
+
+		# Shift next block's position a little bit to avoid overlap totally.
+		next_position.x += bias
+		next_position.y += bias
+
+
 func add_block(block: Block, position: Vector2 = Vector2.ZERO) -> void:
 	if block is EntryBlock:
 		block.position = canvas_to_window(position).snapped(SNAP_GRID)

addons/block_code/ui/blocks/utilities/template_editor/template_editor.gd

@@ -13,8 +13,6 @@ const ParameterInputScene = preload("res://addons/block_code/ui/blocks/utilities
 const ParameterOutput = preload("res://addons/block_code/ui/blocks/utilities/parameter_output/parameter_output.gd")
 const ParameterOutputScene = preload("res://addons/block_code/ui/blocks/utilities/parameter_output/parameter_output.tscn")
 
-const FORMAT_STRING_PATTERN = "\\[(?<out_parameter>[^\\]]+)\\]|\\{(?<in_parameter>[^}]+)\\}|(?<label>[^\\{\\[]+)"
-
 ## A string describing a block's display format. For example:
 ## [br]
 ## [code]
@@ -41,7 +39,6 @@ var parent_block: Block
 var _parameter_inputs_by_name: Dictionary
 
 @onready var _container := %Container
-@onready var _regex := RegEx.create_from_string(FORMAT_STRING_PATTERN)
 
 
 func _ready() -> void:
@@ -97,6 +94,8 @@ func _update_from_format_string():
 			_append_input_parameter(item.get("in_parameter"), match_id)
 		elif item.has("out_parameter"):
 			_append_output_parameter(item.get("out_parameter"), match_id)
+		elif item.has("const_parameter"):
+			_append_const_parameter(item.get("const_parameter"), match_id)
 		match_id += 1
 
 
@@ -107,7 +106,7 @@ func _append_label(label_format: String):
 	_container.add_child(label)
 
 
-func _append_input_parameter(parameter: Dictionary, id: int):
+func _append_input_parameter(parameter: Dictionary, id: int) -> ParameterInput:
 	var default_value = parameter_defaults.get(parameter["name"])
 
 	var parameter_input: ParameterInput = ParameterInputScene.instantiate()
@@ -129,6 +128,8 @@ func _append_input_parameter(parameter: Dictionary, id: int):
 	_container.add_child(parameter_input)
 	_parameter_inputs_by_name[parameter["name"]] = parameter_input
 
+	return parameter_input
+
 
 func _append_output_parameter(parameter: Dictionary, id: int):
 	var parameter_output: ParameterOutput
@@ -140,5 +141,12 @@ func _append_output_parameter(parameter: Dictionary, id: int):
 	_container.add_child(parameter_output)
 
 
+func _append_const_parameter(parameter: Dictionary, id: int):
+	# const_parameter is a kind of in_parameter with default value, but never
+	# changes value.
+	var parameter_const := _append_input_parameter(parameter, id)
+	parameter_const.visible = false
+
+
 func _on_parameter_input_drag_started(offset: Vector2):
 	drag_started.emit(offset)