add pass if equal node (#120)

closes #119

Reviewed-on: https://codeberg.org/StreamGraph/StreamGraph/pulls/120
Co-authored-by: Lera Elvoé <yagich@poto.cafe>
Co-committed-by: Lera Elvoé <yagich@poto.cafe>

classes/deck/nodes/general/pass_if_equal.gd

@@ -0,0 +1,55 @@
+# (c) 2023-present Eroax
+# (c) 2023-present Yagich
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+extends DeckNode
+
+
+func _init() -> void:
+	name = "Pass If Equal"
+	node_type = name.to_snake_case()
+	description = "Receives a trigger and passes it if the values are equal."
+	
+	add_input_port(
+		DeckType.Types.ANY,
+		"Input",
+		"",
+		Port.UsageType.TRIGGER,
+	)
+	
+	add_input_port(
+		DeckType.Types.ANY,
+		"Value A",
+		"field",
+		Port.UsageType.VALUE_REQUEST,
+	)
+	
+	add_input_port(
+		DeckType.Types.ANY,
+		"Value B",
+		"field",
+		Port.UsageType.VALUE_REQUEST,
+	)
+	
+	add_output_port(
+		DeckType.Types.ANY,
+		"Equal",
+		"",
+		Port.UsageType.TRIGGER
+	)
+	
+	add_output_port(
+		DeckType.Types.ANY,
+		"Not Equal",
+		"",
+		Port.UsageType.TRIGGER
+	)
+
+
+func _receive(_to_input_port: int, data: Variant) -> void:
+	var value_a = await resolve_input_port_value_async(1)
+	var value_b = await resolve_input_port_value_async(2)
+	
+	if value_a == value_b:
+		send(0, data)
+	else:
+		send(1, data)