Trait ScriptExpression

Source

pub trait ScriptExpression: Send + Sync {
    // Required method
    fn evaluate(&self, context: &mut Context, registry: &Registry);
}

Expand description

The extra operations a frontend adds on top of the built-in set.

The built-in operations move data around but never create it, since the platform has no opinion about what data is. Pushing a literal, dropping a value, anything else specific to one language, goes here.

enum MyExpression {
    Literal(i32),
    Drop,
}

impl ScriptExpression for MyExpression {
    fn evaluate(&self, context: &mut Context, _: &Registry) {
        match self {
            Self::Literal(value) => { context.stack().push(*value); }
            Self::Drop => { context.stack().drop(); }
        }
    }
}