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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2023 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 swift(>=6)
public import SwiftSyntax
#else
import SwiftSyntax
#endif
extension IntegerLiteralExprSyntax {
public enum Radix: Sendable {
case binary
case octal
case decimal
case hex
public var size: Int {
switch self {
case .binary: return 2
case .octal: return 8
case .decimal: return 10
case .hex: return 16
}
}
}
public var radix: Radix {
let text = self.literal.text
if text.starts(with: "0b") {
return .binary
} else if text.starts(with: "0o") {
return .octal
} else if text.starts(with: "0x") {
return .hex
} else {
return .decimal
}
}
/// Returns an (arbitrarily) "ideal" number of digits that should constitute
/// a separator-delimited "group" in an integer literal.
var idealGroupSize: Int {
switch self.radix {
case .binary: return 4
case .octal: return 3
case .decimal: return 3
case .hex: return 4
}
}
/// Split the leading radix prefix from the value part of this integer literal.
///
/// ```
/// 10 -> ("", "10")
/// 0xFFFF -> ("0x", "FFFF")
/// 0o77 -> ("0o", "77")
/// 0b1010101 -> ("0b", "1010101")
/// ```
public func split() -> (prefix: String, value: Substring) {
let text = self.literal.text
switch self.radix {
case .binary:
return ("0b", text.dropFirst(2))
case .octal:
return ("0o", text.dropFirst(2))
case .decimal:
return ("", Substring(text))
case .hex:
return ("0x", text.dropFirst(2))
}
}
}
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