70 lines
2.3 KiB
Swift
70 lines
2.3 KiB
Swift
import Foundation
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/// A reusable, bundle-bound localizer that resolves String Catalog entries for an explicit locale.
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///
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/// A server has no single "current" locale, so each lookup must name the locale to use. An instance is bound to the bundle whose catalog holds the strings,
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/// then invoked like a function to resolve a key in a chosen locale.
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public struct Localize: Sendable {
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// MARK: Properties
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/// The backend that resolves keys against the catalog.
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private let resolver: any CatalogResolving
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// MARK: Computed
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/// The outcome of reading the bundle's String Catalog.
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///
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/// Resolution degrades to returning raw keys rather than failing, so check this once at startup and warn when it is not ``CatalogState/loaded``.
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public var catalogState: CatalogState {
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resolver.state
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}
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// MARK: Initializers
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/// Creates a localizer backed by the String Catalog in the given bundle.
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/// - Parameters:
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/// - bundle: the bundle whose String Catalog contains the keys to resolve.
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/// - table: the name of the String Catalog resource, without the `.xcstrings` extension.
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public init(
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bundle: Bundle,
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table: String = "Localizable"
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) {
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self.init(resolver: StringCatalog.cached(
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bundle: bundle,
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table: table
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))
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}
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/// Creates a localizer backed by the given resolver.
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///
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/// The seam for tests and alternative backends; the public API resolves against a bundled catalog.
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/// - Parameter resolver: the backend that resolves keys to localized strings.
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init(
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resolver: any CatalogResolving
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) {
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self.resolver = resolver
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}
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// MARK: Methods
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/// Resolves a catalog key in the given locale.
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///
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/// Invoked by calling the instance directly, for example `localize("index.title", locale: locale)`.
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/// - Parameters:
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/// - key: the String Catalog key to look up.
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/// - locale: the locale to resolve the key in.
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/// - Returns: the localized string for the locale, the source-language string when the locale has no entry, or the key itself when the catalog has no
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/// entry for it.
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public func callAsFunction(
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_ key: String,
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locale: Locale
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) -> String {
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resolver.string(
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for: key,
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in: locale
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)
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}
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}
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