Fix version conflict parsing

Sources/apk/Version/ApkVersionRequirement.swift

@@ -38,10 +38,7 @@ internal struct ApkVersionRequirement: Hashable {
       }
       (nameEnd, versionStart) = (range.lowerBound, range.upperBound)
     } else {
-      // Lack of conflict flag indicates any version
-      if !comparer.contains(.conflict) {
       comparer.formUnion(.any)
-      }
       (nameEnd, versionStart) = (dependStr.endIndex, dependStr.endIndex)
     }
 
@@ -54,9 +51,10 @@ internal struct ApkVersionRequirement: Hashable {
 extension ApkVersionRequirement: CustomStringConvertible {
   var description: String {
     switch self.versionSpec {
-    case .any: self.name
+    case .any(let invert):
-    case .conflict: "!\(self.name)"
+      "\(invert ? "!" : "")\(self.name)"
-    case .constraint(let op, let version): "\(self.name)\(op)\(version)"
+    case .constraint(let invert, let op, let version):
+      "\(invert ? "!" : "")\(self.name)\(op)\(version)"
     }
   }
 }
@@ -92,16 +90,11 @@ fileprivate extension ApkVersionRequirement {
 
 fileprivate extension ApkVersionSpecification {
   init(_ bits: ApkVersionRequirement.ComparatorBits, version: Substring) throws(ApkVersionRequirement.ParseError) {
-    if bits == [ .conflict ] {
+    let invert = bits.contains(.conflict)
-      self = .conflict
+    self = if bits.subtracting(.conflict) == [ .any ] {
+      .any(invert: invert)
     } else {
-      if bits.contains(.conflict) {
+      .constraint(invert: invert, op: try .init(bits), version: String(version))
-        throw .brokenSpec
-      } else if bits == [ .any ] {
-        self = .any
-      } else {
-        self = .constraint(op: try .init(bits), version: String(version))
-      }
     }
   }
 }

Sources/apk/Version/ApkVersionSpecification.swift

@@ -4,9 +4,8 @@
  */
 
 enum ApkVersionSpecification: Equatable, Hashable {
-  case any
+  case any(invert: Bool)
-  case constraint(op: Operator, version: String)
+  case constraint(invert: Bool, op: Operator, version: String)
-  case conflict
 }
 
 extension ApkVersionSpecification {