36 lines
1.2 KiB
Swift
36 lines
1.2 KiB
Swift
import Foundation
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private var regexCache = [RegexCacheKey: NSRegularExpression]()
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private let regexCacheLock = NSLock()
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private struct RegexCacheKey: Hashable {
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// Disable unused private declaration rule here because even though we don't use these properties
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// directly, we rely on them for their hashable and equatable behavior.
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// swiftlint:disable unused_private_declaration
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let pattern: String
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let options: NSRegularExpression.Options
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// swiftlint:enable unused_private_declaration
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}
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extension NSRegularExpression.Options: Hashable {
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public func hash(into hasher: inout Hasher) {
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hasher.combine(rawValue)
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}
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}
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extension NSRegularExpression {
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internal static func cached(pattern: String, options: Options? = nil) throws -> NSRegularExpression {
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let options = options ?? [.anchorsMatchLines, .dotMatchesLineSeparators]
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let key = RegexCacheKey(pattern: pattern, options: options)
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regexCacheLock.lock()
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defer { regexCacheLock.unlock() }
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if let result = regexCache[key] {
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return result
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}
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let result = try NSRegularExpression(pattern: pattern, options: options)
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regexCache[key] = result
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return result
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}
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}
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