Update conditionals: characters is deprecated from Swift 3.2

Author: tbkka

Sources/PluginLibrary/NamingUtils.swift

@@ -189,7 +189,7 @@ fileprivate func sanitizeTypeName(_ s: String, disambiguator: String) -> String
     // conflict.  This can be resolved recursively by stripping
     // the disambiguator, sanitizing the root, then re-adding the
     // disambiguator:
-    #if swift(>=4.0)
+    #if swift(>=3.2)
       let e = s.index(s.endIndex, offsetBy: -disambiguator.count)
       let truncated = String(s[..<e])
     #else
@@ -301,7 +301,7 @@ public enum NamingUtils {
     //  "pacakge.some_name" -> "Package_SomeName"
     var makeUpper = true
     var prefix = ""
-#if swift(>=4.0)
+#if swift(>=3.2)
     let protoPackageChars = protoPackage
 #else
     let protoPackageChars = protoPackage.characters

Sources/SwiftProtobuf/Google_Protobuf_Any+Registry.swift

@@ -21,7 +21,7 @@ import Dispatch
 
 internal func buildTypeURL(forMessage message: Message, typePrefix: String) -> String {
   var url = typePrefix
-#if swift(>=4.0)
+#if swift(>=3.2)
   let needsSlash = typePrefix.isEmpty || typePrefix.last != "/"
 #else
   let needsSlash = typePrefix.isEmpty || typePrefix.characters.last != "/"

Sources/SwiftProtobuf/Google_Protobuf_Duration+Extensions.swift

@@ -23,7 +23,7 @@ private func parseDuration(text: String) throws -> (Int64, Int32) {
   var digits = [Character]()
   var digitCount = 0
   var total = 0
-#if swift(>=4.0)
+#if swift(>=3.2)
   var chars = text.makeIterator()
 #else
   var chars = text.characters.makeIterator()

Sources/SwiftProtobuf/Google_Protobuf_FieldMask+Extensions.swift

@@ -18,7 +18,7 @@
 
 private func ProtoToJSON(name: String) -> String? {
   var jsonPath = String()
-#if swift(>=4.0)
+#if swift(>=3.2)
   var chars = name.makeIterator()
 #else
   var chars = name.characters.makeIterator()
@@ -47,7 +47,7 @@ private func ProtoToJSON(name: String) -> String? {
 
 private func JSONToProto(name: String) -> String? {
   var path = String()
-#if swift(>=4.0)
+#if swift(>=3.2)
   let chars = name
 #else
   let chars = name.characters
@@ -70,7 +70,7 @@ private func parseJSONFieldNames(names: String) -> [String]? {
   var fieldNameCount = 0
   var fieldName = String()
   var split = [String]()
-#if swift(>=4.0)
+#if swift(>=3.2)
   let namesChars = names
 #else
   let namesChars = names.characters

Sources/SwiftProtobuf/NameMap.swift

@@ -23,7 +23,7 @@
 private func toJsonFieldName(_ s: String) -> String {
     var result = String()
     var capitalizeNext = false
-#if swift(>=4.0)
+#if swift(>=3.2)
     let chars = s
 #else
     let chars = s.characters

Sources/protoc-gen-swift/StringUtils.swift

@@ -14,7 +14,7 @@ func splitPath(pathname: String) -> (dir:String, base:String, suffix:String) {
   var dir = ""
   var base = ""
   var suffix = ""
-#if swift(>=4.0)
+#if swift(>=3.2)
   let pathnameChars = pathname
 #else
   let pathnameChars = pathname.characters
@@ -31,7 +31,7 @@ func splitPath(pathname: String) -> (dir:String, base:String, suffix:String) {
       suffix += String(c)
     }
   }
-#if swift(>=4.0)
+#if swift(>=3.2)
   let validSuffix = suffix.isEmpty || suffix.first == "."
 #else
   let validSuffix = suffix.isEmpty || suffix.characters.first == "."

Tests/SwiftProtobufTests/Test_JSON.swift

@@ -137,7 +137,7 @@ class Test_JSON: XCTestCase, PBTestHelpers {
         var m = MessageTestType()
         configureLargeObject(&m)
         let s = try m.jsonString()
-#if swift(>=4.0)
+#if swift(>=3.2)
         let chars = s
 #else
 	let chars = s.characters