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Conditional Lines

Giving the player choices is one way that dialogue can branch, another way is by having conditional paths in your scripts, where different paths are taken based on variable state.

You do this by using conditional lines. Here's an example:

Player: Hello
[if {x} == 1]
    NPC: Reply when x == 1
    [if {y} > 0]
        Player: Player text when x == 1 and y > 0
[elseif {x} > 1]
    NPC: Reply when x > 1
    NPC: Reply when x is something else

Conditional lines start or end a block of other lines which only run if the containing conditions evaluate to true. You have the typical programming conditionals if, elseif, and else, and only one of those paths will be taken; endif finishes that conditional set.

Conditional blocks can be nested, as shown above.

Indentation is technically not required and doesn't have any effect on conditionals. However it can help for readability to indent each conditional block.

Conditional Expressions

The tests in if and elseif lines are Expressions. They must resolve to a boolean value (if they don't, there will be an error reported and that branch will never be taken). You can refer to variables and perform operations, see the Expressions section for more details.

Conditional Choices

As well as changing the main sequence of a dialogue, conditions can also turn on/off choices:

NPC: Hello
    * First choice
        Player: I took the 1.1 choice
[if {y} == 2]
    * Second choice (conditional)
        Player: I took the 1.2 choice
    * Third choice (conditional)
        Player: I took the 1.3 choice
    * Second Alt Choice
        Player: I took the alt 1.2 choice        
    * Common last choice
        Player: I took the 1.4 choice

In this case, "First choice" and "Common last choice" are always available, but the other 3 are only available if the condition in the surrounding block passes. When you run the dialogue, which choices are available will be evaluated when the "NPC: Hello" line becomes active.

Since choices rely on consistent indenting, be careful when putting conditions around choices that you don't end up changing the meaning of the choice branches accidentally. Ideally keep the choices at the same indent they would normally be to make it easier to line things up.

See Also