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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
/// Format an integer literal by inserting underscores at base-appropriate
/// locations.
///
/// This pass will also clean up any errant underscores.
///
/// ## Before
///
/// ```swift
/// 123456789
/// 0xFFFFFFFFF
/// 0b1_0_1_0
/// ```
///
/// ## After
///
/// ```swift
/// 123_456_789
/// 0xF_FFFF_FFFF
/// 0b1_010
/// ```
public struct AddSeparatorsToIntegerLiteral: SyntaxRefactoringProvider {
public static func refactor(syntax lit: IntegerLiteralExprSyntax, in context: Void) -> IntegerLiteralExprSyntax? {
if lit.literal.text.contains("_") {
guard let strippedLiteral = RemoveSeparatorsFromIntegerLiteral.refactor(syntax: lit) else {
return nil
}
return self.addSeparators(to: strippedLiteral)
} else {
return self.addSeparators(to: lit)
}
}
private static func addSeparators(to lit: IntegerLiteralExprSyntax) -> IntegerLiteralExprSyntax {
var formattedText = ""
let (prefix, value) = lit.split()
formattedText += prefix
formattedText += value.byAddingGroupSeparators(at: lit.idealGroupSize)
return
lit
.with(\.literal, lit.literal.with(\.tokenKind, .integerLiteral(formattedText)))
}
}
extension Substring {
fileprivate func byAddingGroupSeparators(at interval: Int) -> String {
var result = ""
result.reserveCapacity(self.count)
for (i, char) in self.filter({ $0 != "_" }).reversed().enumerated() {
if i > 0 && i % interval == 0 {
result.append("_")
}
result.append(char)
}
return String(result.reversed())
}
}
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