Add condition to choice (#960)

Adds a condition input to the choice event. UI is very bad but functionality is there. You can also choose, what to do if the condition isn't met (Default/Hide/Disable). Default is currently just the same as Hide, but I want to add a setting for this later.

In the text format you can write the conditions like this:
```
Emilio: Wow, some options are disabled!
- This is disabled [if false] [else disable]
- This might be disabled [if some_cool_condition] [else disabeld]
- This will be hidden [if false] [else hide]
- This is always visible
```

# Other
- moved the condition execution into a function of the dialogic_game_handler, because now multiple events (and the game_handler itself) use it.

addons/dialogic/Events/Choice/event.gd

@@ -2,8 +2,12 @@ tool
 extends DialogicEvent
 class_name DialogicChoiceEvent
 
+enum IfFalseActions {DEFAULT, HIDE, DISABLE}
+
 # DEFINE ALL PROPERTIES OF THE EVENT
 var Text :String = ""
+var Condition:String = ""
+var IfFalseAction = IfFalseActions.DEFAULT
 
 func _execute() -> void:
 	# I have no idea how this event works
@@ -31,15 +35,30 @@ func get_as_string_to_store() -> String:
 	var result_string = ""
 
 	result_string = "- "+Text
+	if Condition:
+		result_string += " [if "+Condition+"]"
+
+	if IfFalseAction == IfFalseActions.HIDE:
+		result_string += " [else hide]"
+	elif IfFalseAction == IfFalseActions.DISABLE:
+		result_string += " [else disable]"
 
 	return result_string
 
 
 ## THIS HAS TO READ ALL THE DATA FROM THE SAVED STRING (see above) 
 func load_from_string_to_store(string:String):
+	var regex = RegEx.new()
+	regex.compile('- (?<text>[^\\[]*)(\\[if (?<condition>[^\\]]+)])?\\s?(\\[else (?<else_option>[^\\]\\n]*)\\])?')
+	var result = regex.search(string.strip_edges())
 
-	Text = string.strip_edges().trim_prefix("-").strip_edges()
-
+	Text = result.get_string('text')
+	Condition = result.get_string('condition')
+	if result.get_string('else_option'):
+		IfFalseAction = {
+			'default':IfFalseActions.DEFAULT, 
+			'hide':IfFalseActions.HIDE,
+			'disable':IfFalseActions.DISABLE}.get(result.get_string('else_option'), IfFalseActions.DEFAULT)
 
 # RETURN TRUE IF THE GIVEN LINE SHOULD BE LOADED AS THIS EVENT
 func is_valid_event_string(string:String) -> bool:
@@ -56,3 +75,5 @@ func is_valid_event_string(string:String) -> bool:
 
 func build_event_editor():
 	add_header_edit("Text", ValueType.SinglelineText)
+	add_body_edit("Condition", ValueType.SinglelineText, 'if ')
+	add_body_edit("IfFalseAction", ValueType.FixedOptionSelector, 'else ', '', {'selector_options':{"Default":IfFalseActions.DEFAULT, "Hide":IfFalseActions.HIDE, "Disable":IfFalseActions.DISABLE}})

addons/dialogic/Events/Condition/event.gd

@@ -13,9 +13,7 @@ func _execute() -> void:
 		finish()
 		return
 
-	var expr = Expression.new()
-	expr.parse(Condition)
-	var result = expr.execute()
+	var result = dialogic_game_handler.execute_condition(Condition)
 	if not result:
 		var idx = dialogic_game_handler.current_event_idx
 		var ignore = 1

addons/dialogic/Other/DialogicGameHandler.gd

@@ -171,15 +171,23 @@ func show_current_choices() -> void:
 	var button_idx = 1
 	for choice_index in get_current_choice_indexes():
 		var choice_event = current_timeline_events[choice_index]
-		show_choice(button_idx, choice_event.Text, true, choice_index)
-		button_idx += 1
-
+		# check if condition is false
+		if not choice_event.Condition.empty() and not execute_condition(choice_event.Condition):
+			# check what to do in this case
+			if choice_event.IfFalseAction == DialogicChoiceEvent.IfFalseActions.DISABLE:
+				show_choice(button_idx, choice_event.Text, false, choice_index)
+				button_idx += 1
+		# else just show it
+		else:
+			show_choice(button_idx, choice_event.Text, true, choice_index)
+			button_idx += 1
 func show_choice(button_index:int, text:String, enabled:bool, event_index:int) -> void:
 	var idx = 1
 	for node in get_tree().get_nodes_in_group('dialogic_choice_button'):
 		if (node.choice_index == button_index) or (idx == button_index and node.choice_index == -1):
 			node.show()
 			node.text = parse_variables(text)
+			node.disabled = not enabled
 			node.connect('pressed', self, 'choice_selected', [event_index])
 		if node.choice_index >0:
 			idx = node.choice_index
@@ -365,6 +373,11 @@ func get_current_portrait_info_of_character(character:DialogicCharacter) -> Arra
 func interpolate_volume_linearly(value, node):
 	node.volume_db = linear2db(value)
 
+func execute_condition(condition:String) -> bool:
+	var expr = Expression.new()
+	expr.parse(condition)
+	return true if expr.execute() else false
+
 func get_autoloads() -> Array:
 	var autoloads = []
 	for c in get_tree().root.get_children():