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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2022 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
//
//===----------------------------------------------------------------------===//
struct RegexPatternCache: @unchecked Sendable {
private struct Key : Sendable, Hashable {
var pattern: String
var caseInsensitive: Bool
}
private let _lock: LockedState<[Key: Regex<AnyRegexOutput>]>
static let cache = RegexPatternCache()
fileprivate init() {
_lock = LockedState(initialState: .init())
}
func regex(for pattern: String, caseInsensitive: Bool) throws -> Regex<AnyRegexOutput>? {
let key = Key(pattern: pattern, caseInsensitive: caseInsensitive)
return try _lock.withLock { cache in
if let cached = cache[key] {
return cached
}
var r = try Regex(pattern).wordBoundaryKind(.simple)
if caseInsensitive {
r = r.ignoresCase()
}
cache[key] = r
return r
}
}
}
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