Evaluating Boolean Expressions

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Evaluating a BoolExpr

Evaluating a BoolExpr is as simple as calling a function.

do
    local expression = BoolExpr.Xor(
        function ()
            print("true")
            return true
        end,
        function ()
            print("false")
            return false
        end
    )

    print("XOR Result: " .. (expression() and "true" or "false")) -- evaluate expression
end

Output:

true

false

XOR Result: true

Evaluating a BoolExpr Table

A BoolExpr Table does not have BoolExpr as its metatable so you cannot call the table directly as done above. It’s also ugly to call __call with a dot notation either so you can instead use evaluate().

do
    local expression =
    {
        BoolExpr.XOR,
        function ()
            print("true")
            return true
        end,
        function ()
            print("false")
            return false
        end
    }

    print("XOR Result: " .. (BoolExpr.evaluate(expression) and "true" or "false")) -- evaluate expression
end

Output:

true

false

XOR Result: true

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