Formatted plurals

CHANGELOG.md

@@ -8,6 +8,9 @@
 
 ## master
 
+### Added
+- Add support for formatted plurals ([#33](https://github.com/AckeeCZ/ACKLocalization/pull/33), kudos to @leinhauplk)
+
 ## 1.3.0
 
 ### Added

Sources/ACKLocalizationCore/Model/PluralRuleWrapper.swift

@@ -15,27 +15,40 @@ struct PluralRuleWrapper {
 }
 
 extension PluralRuleWrapper: Codable {
+    private enum Constants {
+        static let stringFormatSpecifier = "%s"
+    }
+
     func encode(to encoder: Encoder) throws {
         // Since the stringDict is completely dynamic
         // we cannot use some predefined `struct` to encapsulate the data.
         // We need to use `CustomKey` that can take any string as a key.
         var container = encoder.container(keyedBy: CustomKey.self)
 
+        // If the plural contains string format specifier, then use the positional arguments.
+        let containsStringSpecifier: Bool = translations.contains(where: {
+            $0.value.lowercased().contains(Constants.stringFormatSpecifier)
+        } )
+        let formatKey = containsStringSpecifier ? "%1$#@inner@" : "%#@inner@"
+
         var items = [
             // Mandatory key and the only option
             "NSStringFormatSpecTypeKey": "NSStringPluralRuleType",
             "NSStringFormatValueTypeKey": "d"
         ]
 
         translations.forEach {
-            items[$0.key.rawValue] = $0.value
+            items[$0.key.rawValue] = $0.value.replacingOccurrences(
+                of: Constants.stringFormatSpecifier,
+                with: "%2$@"
+            )
         }
 
         // StringsDicts use variables by default.
         // We need to specify the variable that is then
         // replaced by the plural rule.
         // In this case the variable is `inner` and it's hardcoded.
-        try container.encode("%#@inner@", forKey: .init(stringValue: "NSStringLocalizedFormatKey"))
+        try container.encode(formatKey, forKey: .init(stringValue: "NSStringLocalizedFormatKey"))
         try container.encode(items, forKey: .init(stringValue: "inner"))
     }
 }

Tests/ACKLocalizationCoreTests/ACKLocalization+Plurals.swift

@@ -96,4 +96,58 @@ final class ACKLocalizationPluralsTests: XCTestCase {
             XCTAssertEqual(error as? PluralError, PluralError.invalidPluralRule(rows[0].key))
         }
     }
+
+    func testPluralWithStringFormatSpecifier() throws {
+        // Given
+        let rows = [
+            LocRow(key: "key##{many}", value: "%d many"),
+        ]
+
+        let expectedResult: [String: Encodable] = [
+            "NSStringLocalizedFormatKey": "%#@inner@",
+            "inner": [
+                "NSStringFormatSpecTypeKey": "NSStringPluralRuleType",
+                "NSStringFormatValueTypeKey": "d",
+                "many": "%d many"
+            ]
+        ]
+        let expectedResultEncoded = try JSONSerialization
+            .data(withJSONObject: expectedResult, options: .sortedKeys)
+
+        // When
+        let plurals = try ackLocalization.buildPlurals(from: rows)
+        let encoder = JSONEncoder()
+        encoder.outputFormatting = .sortedKeys
+        let encodedData = try encoder.encode(plurals.first?.value)
+
+        // Then
+        XCTAssertEqual(encodedData, expectedResultEncoded)
+    }
+
+    func testPluralWithIntegerFormatSpecifier() throws {
+        // Given
+        let rows = [
+            LocRow(key: "key##{many}", value: "%s many"),
+        ]
+
+        let expectedResult: [String: Encodable] = [
+            "NSStringLocalizedFormatKey": "%1$#@inner@",
+            "inner": [
+                "NSStringFormatSpecTypeKey": "NSStringPluralRuleType",
+                "NSStringFormatValueTypeKey": "d",
+                "many": "%2$@ many"
+            ]
+        ]
+        let expectedResultEncoded = try JSONSerialization
+            .data(withJSONObject: expectedResult, options: .sortedKeys)
+
+        // When
+        let plurals = try ackLocalization.buildPlurals(from: rows)
+        let encoder = JSONEncoder()
+        encoder.outputFormatting = .sortedKeys
+        let encodedData = try encoder.encode(plurals.first?.value)
+
+        // Then
+        XCTAssertEqual(encodedData, expectedResultEncoded)
+    }
 }