110 lines
3.7 KiB
Swift
110 lines
3.7 KiB
Swift
//
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// PreferenceValue.swift
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//
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// Copyright 2026 Brendan Szymanski <hello@bscubed.dev>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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//
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// SPDX-License-Identifier: GPL-3.0-or-later
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//
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import Foundation
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/// Converts a Swift preference type to and from a SQLite scalar value.
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package protocol PreferenceValue: Sendable, Equatable {
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/// Decodes a value read back from storage, or `nil` when the stored shape does not match.
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///
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/// - Parameter preference: The raw value read from the preference table.
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/// - Returns: A decoded value, or `nil` when the storage representation is incompatible.
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init?(preference: StoredPreference)
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/// The storage representation of this value.
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var preferenceValue: StoredPreference { get }
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}
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extension Bool: PreferenceValue {
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package init?(preference: StoredPreference) {
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guard case .integer(let value) = preference, value == 0 || value == 1 else { return nil }
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self = value == 1
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}
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package var preferenceValue: StoredPreference { .integer(self ? 1 : 0) }
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}
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extension Int: PreferenceValue {
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package init?(preference: StoredPreference) {
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guard case .integer(let value) = preference, let value = Int(exactly: value) else { return nil }
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self = value
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}
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package var preferenceValue: StoredPreference { .integer(Int64(self)) }
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}
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extension Double: PreferenceValue {
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package init?(preference: StoredPreference) {
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switch preference {
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case .real(let value): self = value
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case .integer(let value): self = Double(value)
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default: return nil
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}
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}
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/// Non-finite values are encoded as zero because SQLite stores NaN as SQL NULL.
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package var preferenceValue: StoredPreference { .real(isFinite ? self : 0) }
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}
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extension String: PreferenceValue {
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package init?(preference: StoredPreference) {
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guard case .text(let value) = preference else { return nil }
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self = value
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}
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package var preferenceValue: StoredPreference { .text(self) }
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}
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extension URL: PreferenceValue {
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package init?(preference: StoredPreference) {
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guard case .text(let value) = preference, let url = URL(string: value) else { return nil }
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self = url
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}
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package var preferenceValue: StoredPreference { .text(absoluteString) }
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}
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extension UUID: PreferenceValue {
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package init?(preference: StoredPreference) {
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guard case .text(let value) = preference, let uuid = UUID(uuidString: value) else { return nil }
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self = uuid
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}
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package var preferenceValue: StoredPreference { .text(uuidString) }
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}
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extension Data: PreferenceValue {
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package init?(preference: StoredPreference) {
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guard case .blob(let value) = preference else { return nil }
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self = value
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}
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package var preferenceValue: StoredPreference { .blob(self) }
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}
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extension PreferenceValue where Self: RawRepresentable, Self.RawValue: PreferenceValue {
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package init?(preference: StoredPreference) {
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guard let raw = RawValue(preference: preference) else { return nil }
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self.init(rawValue: raw)
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}
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package var preferenceValue: StoredPreference { rawValue.preferenceValue }
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}
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