javier
0e71b2673c
This PR contains the work done to update the project to use the *Apache v2.0* license. Reviewed-on: #6 Co-authored-by: Javier Cicchelli <javier@rock-n-code.com> Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>
49 lines
1.3 KiB
Swift
49 lines
1.3 KiB
Swift
// ===----------------------------------------------------------------------===
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//
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// This source file is part of the Hummingbird DocC open source project
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//
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// Copyright (c) 2025 Röck+Cöde VoF. and the Hummingbird DocC project authors
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// Licensed under Apache license v2.0
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//
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// See LICENSE for license information
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// See CONTRIBUTORS for the list of Hummingbird DocC project authors
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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// ===----------------------------------------------------------------------===
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import RegexBuilder
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extension String {
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/// Subtracts a prefix from a string.
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/// - Parameters:
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/// - prefix: A prefix to remove from a string.
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/// - Returns: A new string with a prefix removed, if any.
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func subtract(
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_ prefix: String
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) -> String? {
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let reference = Reference(String.self)
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let pattern = Regex {
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prefix
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Optionally {
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Capture(as: reference) {
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OneOrMore(.anyNonNewline)
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} transform: { output in
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String(output)
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}
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}
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}
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guard let matches = self.prefixMatch(of: pattern) else {
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return nil
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}
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guard let subtracted = matches.output.1 else {
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return .empty
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}
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return subtracted
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}
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}
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