Do you have any other way in mind without using loadstring? I’m afraid this will pose a security threat.
@Intencidy To number doesn’t work.
Another method is to use a dictionary storing functions:
--Translate string into mathematical expression
local prefixesFunctions = {
["/"] = function (number1,number2)
return number1/number2
end;
["-"] = function (number1,number2)
return number1 - number2
end;
["*"] = function (number1,number2)
return number1*number2
end;
["+"] = function (number1,number2)
return number1+number2
end;
}
From this other post, with a similar gui calculator project:
It won’t pose a security threat if you don’t trust the client by sandboxing properly. You just want to calculate expressions, so you wouldn’t really need any global environment.
The code I have so far is below. The buttons are named “Button1”, “Button2”, each corresponds to the number.
Please let me know how I can apply that dictionary into here.
for i,v in pairs (calculatorFrame:GetChildren()) do
if v:IsA("TextButton") then
v.MouseButton1Click:Connect(function()
local currentText = calculatorFrame.TextCalculation
local actionToDo = string.gsub(v.Name, "Button", "")
if tonumber(actionToDo) ~= nil then
currentText.Text = currentText.Text..tostring(actionToDo)
elseif actionToDo == "Plus" then
currentText.Text = currentText.Text.."+"
elseif actionToDo == "Minus" then
currentText.Text = currentText.Text.."-"
elseif actionToDo == "Multiply" then
-- if not string.find(
currentText.Text = currentText.Text.."*"
elseif actionToDo == "Divide" then
currentText.Text = currentText.Text.."/"
elseif actionToDo == "Calc" then -- calculate the whole string
end
end)
end
end
This might be helpful:
Thank you, but I’ve already looked into this.
Okay… did it not work or…? What do you need to do that loadstring or this module can’t cover?
I prefer not to use loadstring or modules, just a few lines of script if possible.
That is what loadstring can help you achieve, it’s not inherently dangerous.
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Do you have a link to the Roblox documentation page of loadstring? I couldn’t find anything. Thanks.
https://developer.roblox.com/en-us/api-reference/lua-docs/Lua-Globals
It only works server-side so exploiters can’t access it unless you have unsecure remote events
Sample using the parser:
local parser = require(5005473860)
local expression = parser.compile("9/3+7")
local result = parser.run(expression)
print(result) -- 10
--OR
print(parser.evaluate("asin(1)*2")) -- pi
Sample using loadstring:
local expression = "math.exp(1)"
local f = loadstring("return "..expression)
setfenv(f, {math = math}) -- IMPORTANT TO PREVENT CODE INJECTION
local result = f()
print(result) -- e
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Thanks, it works great. Does your paser thing have a documentation?
I got the code from here:
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Do you know how would I be able to find the square root and square number of x? I tried using ^ but it works like an addition, instead of exponent.
Unfortunately from reading through the source code it looks like the ^ symbol was only programmed in as a bitwise ‘xor’ operation. For exponents and square roots you would have to use pow(2, 3) and sqrt(9)
Since my gui calculator only accepts string input from players, can you show how I can do that?
For example if the input was “2+5^2”, how would I make the parser calculate that?
You could probably just modify the parser to use the ^ symbol for exponents instead of bitwise xor. I’ll look into it tomorrow.
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Actually I found it.
Line 1257 of the module says this:
v = bit.bxor( coerce(v1, "number"), coerce(v2, "number") )
Change it to this:
v = coerce(v1, "number") ^ coerce(v2, "number")
and it should work.
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