Better handling of pressure tendency remarks ("5 group")

* Pressure change value is negated for downwards trends
* Localized string fixed to indicate pressure value is a change

Author: RISCfuture

Sources/METARFormatting/Formatters/Remark/Remark.swift

@@ -45,7 +45,7 @@ public extension Remark {
         public var pressureFormat = Measurement<UnitPressure>.FormatStyle(
             width: .abbreviated,
             usage: .asProvided,
-            numberFormatStyle: .number.precision(.fractionLength(0)))
+            numberFormatStyle: .number.precision(.fractionLength(1)))
 
         /// The format to use when printing wind information.
         public var windFormat = Wind.FormatStyle()
@@ -172,7 +172,7 @@ public extension Remark {
                     return ListFormatStyle.list(memberStyle: .event(dateFormat: dateFormat), type: .and).format(events)
 
                 case let .pressureTendency(character, _):
-                    return String(localized: "\(character, format: .pressureCharacter) (currently \(value.pressureMeasurement!, format: pressureFormat))", comment: "remark")
+                    return String(localized: "\(character, format: .pressureCharacter) (change: \(value.pressureMeasurement!, format: pressureFormat))", comment: "remark")
 
                 case let .rapidPressureChange(change):
                     switch change {

Sources/SwiftMETAR/Remarks/Parsers/Types/PressureTendencyParser.swift

@@ -3,24 +3,31 @@ import Foundation
 
 final class PressureTendencyParser: RemarkParser {
     var urgency = Remark.Urgency.routine
-
+    
     private let characterRef = Reference<Remark.PressureCharacter>()
     private let amountRef = Reference<Float>()
-
+    
     private lazy var rx = Regex {
         Anchor.wordBoundary
         "5"
         Capture(as: characterRef) { try! Remark.PressureCharacter.rx } transform: { .init(rawValue: String($0))! }
         Capture(as: amountRef) { Repeat(.digit, count: 3) } transform: { Float($0)!/10.0 }
         Anchor.wordBoundary
     }
-
+    
     func parse(remarks: inout String, date: DateComponents) throws -> Remark? {
         guard let result = try rx.firstMatch(in: remarks) else { return nil }
-
-        let character = result[characterRef],
-            amount = result[amountRef]
-
+        
+        let character = result[characterRef]
+        var amount = result[amountRef]
+        
+        switch character {
+            case .inflectedDown, .deceleratingDown, .steadyDown, .acceleratingDown:
+                amount *= -1
+            default: break
+                
+        }
+        
         remarks.removeSubrange(result.range)
         return .pressureTendency(character: character, change: amount)
     }