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45 lines
1.4 KiB
Swift
45 lines
1.4 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2023 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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import SwiftSyntax
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extension IntegerLiteralExprSyntax {
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/// Returns an (arbitrarily) "ideal" number of digits that should constitute
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/// a separator-delimited "group" in an integer literal.
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package var idealGroupSize: Int {
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switch self.radix {
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case .binary: return 4
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case .octal: return 3
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case .decimal: return 3
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case .hex: return 4
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#if RESILIENT_LIBRARIES
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@unknown default: return 3
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#endif
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}
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}
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/// Split the leading radix prefix from the value part of this integer literal.
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///
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/// ```
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/// 10 -> ("", "10")
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/// 0xFFFF -> ("0x", "FFFF")
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/// 0o77 -> ("0o", "77")
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/// 0b1010101 -> ("0b", "1010101")
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/// ```
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package func split() -> (prefix: String, value: Substring) {
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let text = self.literal.text
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let radix = self.radix
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let literalPrefix = radix.literalPrefix
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return (literalPrefix, text.dropFirst(literalPrefix.count))
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}
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}
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