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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2020 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
//
//===----------------------------------------------------------------------===//
#if canImport(FoundationEssentials)
import FoundationEssentials
#endif
@available(macOS 12.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *)
public struct IntegerParseStrategy<Format> : Codable, Hashable where Format : FormatStyle, Format.FormatInput : BinaryInteger {
public var formatStyle: Format
public var lenient: Bool
var numberFormatType: ICULegacyNumberFormatter.NumberFormatType
var locale: Locale
}
@available(macOS 12.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *)
extension IntegerParseStrategy : Sendable where Format : Sendable {}
@available(macOS 12.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *)
extension IntegerParseStrategy: ParseStrategy {
public func parse(_ value: String) throws -> Format.FormatInput {
guard let parser = ICULegacyNumberFormatter.formatter(for: numberFormatType, locale: locale, lenient: lenient) else {
throw CocoaError(CocoaError.formatting, userInfo: [
NSDebugDescriptionErrorKey: "Cannot parse \(value). Could not create parser." ])
}
let trimmedString = value._trimmingWhitespace()
if let v = parser.parseAsInt(trimmedString) {
guard let exact = Format.FormatInput(exactly: v) else {
throw CocoaError(CocoaError.formatting, userInfo: [
NSDebugDescriptionErrorKey: "Cannot parse \(value). The number does not fall within the valid bounds of the specified output type" ])
}
return exact
} else if let v = parser.parseAsDouble(trimmedString) {
guard v.magnitude < Double(sign: .plus, exponent: Double.significandBitCount + 1, significand: 1) else {
throw CocoaError(CocoaError.formatting, userInfo: [
NSDebugDescriptionErrorKey: "Cannot parse \(value). The number does not fall within the lossless floating-point range" ])
}
guard let exact = Format.FormatInput(exactly: v) else {
throw CocoaError(CocoaError.formatting, userInfo: [
NSDebugDescriptionErrorKey: "Cannot parse \(value). The number does not fall within the valid bounds of the specified output type" ])
}
return exact
} else {
let exampleString = formatStyle.format(123)
throw CocoaError(CocoaError.formatting, userInfo: [
NSDebugDescriptionErrorKey: "Cannot parse \(value). String should adhere to the specified format, such as \(exampleString)" ])
}
}
internal func parse(_ value: String, startingAt index: String.Index, in range: Range<String.Index>) -> (String.Index, Format.FormatInput)? {
guard index < range.upperBound else {
return nil
}
guard let parser = ICULegacyNumberFormatter.formatter(for: numberFormatType, locale: locale, lenient: lenient) else {
return nil
}
let substr = value[index..<range.upperBound]
var upperBound = 0
if let value = parser.parseAsInt(substr, upperBound: &upperBound) {
let upperBoundInSubstr = String.Index(utf16Offset: upperBound, in: substr)
return (upperBoundInSubstr, Format.FormatInput(value))
} else if let value = parser.parseAsInt(substr, upperBound: &upperBound) {
let upperBoundInSubstr = String.Index(utf16Offset: upperBound, in: substr)
return (upperBoundInSubstr, Format.FormatInput(clamping: Int64(value)))
}
return nil
}
}
@available(macOS 12.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *)
public extension IntegerParseStrategy {
init<Value>(format: Format, lenient: Bool = true) where Format == IntegerFormatStyle<Value> {
self.formatStyle = format
self.lenient = lenient
self.locale = format.locale
self.numberFormatType = .number(format.collection)
}
}
@available(macOS 12.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *)
public extension IntegerParseStrategy {
init<Value>(format: Format, lenient: Bool = true) where Format == IntegerFormatStyle<Value>.Percent {
self.formatStyle = format
self.lenient = lenient
self.locale = format.locale
self.numberFormatType = .percent(format.collection)
}
}
@available(macOS 12.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *)
public extension IntegerParseStrategy {
init<Value>(format: Format, lenient: Bool = true) where Format == IntegerFormatStyle<Value>.Currency {
self.formatStyle = format
self.lenient = lenient
self.locale = format.locale
self.numberFormatType = .currency(format.collection)
}
}
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