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8f08a649db
* Create FoundationInternals, an internal module to host shared files used by FoundationInternationalization and FoundationEssentials - Modules will access FoundationInternals types with `package import FoundationInternals`. This is currently an experimental feature of `AccessLevelOnImport`. - Move `LockedState` to FoundationInternals and publicize functions needed by other modules.
50 lines
1.4 KiB
Swift
50 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 - 2022 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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#if canImport(FoundationInternals)
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package import FoundationInternals
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#endif
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struct RegexPatternCache: @unchecked Sendable {
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private struct Key : Sendable, Hashable {
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var pattern: String
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var caseInsensitive: Bool
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}
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private let _lock: LockedState<[Key: Regex<AnyRegexOutput>]>
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static let cache = RegexPatternCache()
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fileprivate init() {
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_lock = LockedState(initialState: .init())
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}
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func regex(for pattern: String, caseInsensitive: Bool) throws -> Regex<AnyRegexOutput>? {
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let key = Key(pattern: pattern, caseInsensitive: caseInsensitive)
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return try _lock.withLock { cache in
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if let cached = cache[key] {
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return cached
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}
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var r = try Regex(pattern)
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if caseInsensitive {
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r = r.ignoresCase()
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}
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cache[key] = r
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return r
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}
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}
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}
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