73 lines
1.8 KiB
Swift
73 lines
1.8 KiB
Swift
import Adwaita
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import CMath
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struct ViewModel {
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private var numberBuffer: String = ""
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private var number1: Double? = nil
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private var number2: Double? = nil
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private var op: Operator? = nil
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@State
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private(set) var display: String = ""
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mutating func clear() {
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numberBuffer = ""
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number1 = nil
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number2 = nil
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op = nil
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display = ""
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}
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mutating func addComma() {
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guard !numberBuffer.isEmpty else { return }
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numberBuffer.append(",")
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display = numberBuffer
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}
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mutating func addNumber(_ number: UInt8) {
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if numberBuffer.isEmpty { display = "" } // Reset display after new number is added to cleared buffer
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numberBuffer.append(String(number))
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display = numberBuffer
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}
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mutating func operation(_ op: Operator) {
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guard !numberBuffer.isEmpty && number1 == nil else { return }
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self.op = op
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if number1 == nil { number1 = Double(numberBuffer) }
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else { number2 = Double(numberBuffer) }
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numberBuffer = ""
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if op == .sqrt {
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display = String(sqrt(number1!))
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number1 = nil
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self.op = nil
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}
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}
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mutating func calculate() {
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number2 = Double(numberBuffer)
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numberBuffer = ""
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var result: Double = 0.0
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switch op {
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case .add:
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result = add_nums(number1!, number2!)
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case .sub:
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result = sub_nums(number1!, number2!)
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case .mul:
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result = mul_nums(number1!, number2!)
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case .div:
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result = div_nums(number1!, number2!)
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case .pow:
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result = pow(number1!, number2!)
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case .sqrt, .none:
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// do nothing
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print("Attempting to apply Square Root to nothing!")
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}
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display = String(result)
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}
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} |