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// This source file is part of the Swift.org open source project
//
// Copyright (c) 2016 - 2019 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
@_spi(SwiftCorelibsFoundation) import FoundationEssentials
// MARK: - Bridging
extension Decimal : _ObjectiveCBridgeable {
@_semantics("convertToObjectiveC")
public func _bridgeToObjectiveC() -> NSDecimalNumber {
return NSDecimalNumber(decimal: self)
}
public static func _forceBridgeFromObjectiveC(_ x: NSDecimalNumber, result: inout Decimal?) {
if !_conditionallyBridgeFromObjectiveC(x, result: &result) {
fatalError("Unable to bridge \(_ObjectiveCType.self) to \(self)")
}
}
public static func _conditionallyBridgeFromObjectiveC(_ input: NSDecimalNumber, result: inout Decimal?) -> Bool {
result = input.decimalValue
return true
}
@_effects(readonly)
public static func _unconditionallyBridgeFromObjectiveC(_ source: NSDecimalNumber?) -> Decimal {
guard let src = source else {
return Decimal()
}
return src.decimalValue
}
}
// MARK: - C Functions
public func pow(_ x: Decimal, _ y: Int) -> Decimal {
_pow(x, y)
}
public func NSDecimalAdd(_ result: UnsafeMutablePointer<Decimal>, _ lhs: UnsafePointer<Decimal>, _ rhs: UnsafePointer<Decimal>, _ roundingMode: Decimal.RoundingMode) -> Decimal.CalculationError {
_NSDecimalAdd(result, lhs, rhs, roundingMode)
}
public func NSDecimalSubtract(_ result: UnsafeMutablePointer<Decimal>, _ lhs: UnsafePointer<Decimal>, _ rhs: UnsafePointer<Decimal>, _ roundingMode: Decimal.RoundingMode) -> Decimal.CalculationError {
_NSDecimalSubtract(result, lhs, rhs, roundingMode)
}
public func NSDecimalMultiply(_ result: UnsafeMutablePointer<Decimal>, _ lhs: UnsafePointer<Decimal>, _ rhs: UnsafePointer<Decimal>, _ roundingMode: Decimal.RoundingMode) -> Decimal.CalculationError {
_NSDecimalMultiply(result, lhs, rhs, roundingMode)
}
public func NSDecimalDivide(_ result: UnsafeMutablePointer<Decimal>, _ lhs: UnsafePointer<Decimal>, _ rhs: UnsafePointer<Decimal>, _ roundingMode: Decimal.RoundingMode) -> Decimal.CalculationError {
_NSDecimalDivide(result, lhs, rhs, roundingMode)
}
public func NSDecimalPower(_ result: UnsafeMutablePointer<Decimal>, _ decimal: UnsafePointer<Decimal>, _ exponent: Int, _ roundingMode: Decimal.RoundingMode) -> Decimal.CalculationError {
_NSDecimalPower(result, decimal, exponent, roundingMode)
}
public func NSDecimalMultiplyByPowerOf10(_ result: UnsafeMutablePointer<Decimal>, _ decimal: UnsafePointer<Decimal>, _ power: CShort, _ roundingMode: Decimal.RoundingMode) -> Decimal.CalculationError {
_NSDecimalMultiplyByPowerOf10(result, decimal, power, roundingMode)
}
public func NSDecimalCompare(_ lhs: UnsafePointer<Decimal>, _ rhs: UnsafePointer<Decimal>) -> ComparisonResult {
_NSDecimalCompare(lhs, rhs)
}
public func NSDecimalRound(_ result: UnsafeMutablePointer<Decimal>, _ decimal: UnsafePointer<Decimal>, _ scale: Int, _ roundingMode: Decimal.RoundingMode) {
_NSDecimalRound(result, decimal, scale, roundingMode)
}
public func NSDecimalNormalize(_ lhs: UnsafeMutablePointer<Decimal>, _ rhs: UnsafeMutablePointer<Decimal>, _ roundingMode: Decimal.RoundingMode) -> Decimal.CalculationError {
_NSDecimalNormalize(lhs, rhs, roundingMode)
}
public func NSDecimalIsNotANumber(_ dcm: UnsafePointer<Decimal>) -> Bool {
return dcm.pointee.isNaN
}
public func NSDecimalCopy(_ destination: UnsafeMutablePointer<Decimal>, _ source: UnsafePointer<Decimal>) {
destination.pointee = source.pointee
}
public func NSDecimalCompact(_ number: UnsafeMutablePointer<Decimal>) {
_NSDecimalCompact(number)
}
public func NSDecimalString(_ dcm: UnsafePointer<Decimal>, _ locale: Any?) -> String {
_NSDecimalString(dcm, locale)
}
public func NSStringToDecimal(_ string: String, processedLength: UnsafeMutablePointer<Int>, result: UnsafeMutablePointer<Decimal>) {
_NSStringToDecimal(string, processedLength: processedLength, result: result)
}
// MARK: - Scanner
// Could be silently inexact for float and double.
extension Scanner {
public func scanDecimal(_ dcm: inout Decimal) -> Bool {
if let result = scanDecimal() {
dcm = result
return true
} else {
return false
}
}
public func scanDecimal() -> Decimal? {
let string = self._scanString
guard let start = string.index(string.startIndex, offsetBy: _scanLocation, limitedBy: string.endIndex) else {
return nil
}
let substring = string[start..<string.endIndex]
let view = String(substring).utf8
let (result, length) = Decimal.decimal(from: view, decimalSeparator: ".".utf8, matchEntireString: false)
_scanLocation = _scanLocation + length
return result
}
// Copied from Scanner.swift
private func decimalValue(_ ch: unichar) -> UInt16? {
guard let s = UnicodeScalar(ch), s.isASCII else { return nil }
guard let value = Character(s).wholeNumberValue else { return nil }
return UInt16(value)
}
}
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