adding variables in if statements

[The_Gnat]

I have the following code. However I apparently do not know the correct syntax for addition in wml because it thinks it is just a string.

I want to check a variable compared to the turn number + 5.

Code: Select all

		[if]
			[variable]
				name=explosion_count
				equals=$turn_nummber|+5
			[/variable]
			[then]
				
				# when it reaches 5 then the mine explodes
				{EARTHQUAKE (
				[message]
					speaker=You
					message=_"Retreat!"
				[/message]
				)}
				{FLASH_WHITE ()}
				
				[endlevel]
					result=victory
				[/endlevel]
				
			[/then]
		[/if]

Thanks for you help!

[Sapient]

Code: Select all

  equals="$($turn_number|+5)"

Note: the quote marks are important for this.

See https://wiki.wesnoth.org/SyntaxWML#Spec ... ute_Values

key = "$(formula-expression)"

[Celtic_Minstrel]

The problem here is that + has a meaning in basic WML - it concatenates two parts of a string together. While this is generally used only on quoted strings, it actually applies to unquoted strings as well. So when you write equals=$turn_number|+5, the WML parser reads this as if it were equals="$turn_number|" + "5" which means the value of equals ends up being "$turn_number|5" (and after variable substitution, if you're on turn 4 you'd be comparing to 45 which will obviously never work).

You're also not using the correct syntax here (in order to add things in WML you need a formula substitution, not just a plain variable substitution), but what I said above still applies if with a formula substitution — equals=$($turn_number|+5) would be parsed into the string "$($turn_number|5)" which after variable substitution has the exact same effect. This is why it's recommended to always enclose formulas in quotes even though it isn't strictly required - the quotes protect the + from the WML parser, allowing it to be passed through to the formula parser.

[Ravana]

Also note that you wrote instead turn_nummber.