added type body length violation

Source/SwiftLintFramework/Linter.swift

@@ -237,11 +237,41 @@ extension File {
                 let kind = flatMap(kindString, { SwiftDeclarationKind(rawValue: $0) }) {
                 violations.extend(self.validateTypeName(kind, dict: subDict))
                 violations.extend(self.validateVariableName(kind, dict: subDict))
+                violations.extend(self.validateTypeBodyLength(kind, dict: subDict))
             }
             return violations
         }, [], +)
     }
 
+    func validateTypeBodyLength(kind: SwiftDeclarationKind, dict: XPCDictionary) ->
+        [StyleViolation] {
+        let typeKinds: [SwiftDeclarationKind] = [
+            .Class,
+            .Struct,
+            .Enum
+        ]
+        if !contains(typeKinds, kind) {
+            return []
+        }
+        var violations = [StyleViolation]()
+        if let name = dict["key.name"] as? String,
+            let offset = flatMap(dict["key.offset"] as? Int64, { Int($0) }),
+            let bodyOffset = flatMap(dict["key.bodyoffset"] as? Int64, { Int($0) }),
+            let bodyLength = flatMap(dict["key.bodylength"] as? Int64, { Int($0) }) {
+                let location = Location(file: self, offset: offset)
+                let startLine = self.contents.lineAndCharacterForByteOffset(bodyOffset)
+                let endLine = self.contents.lineAndCharacterForByteOffset(bodyOffset + bodyLength)
+                if let startLine = startLine?.line, let endLine = endLine?.line
+                    where endLine - startLine > 200 {
+                    violations.append(StyleViolation(type: .Length,
+                        location: location,
+                        reason: "Type body should be span 200 lines or less: currently spans " +
+                        "\(endLine - startLine) lines"))
+                }
+        }
+        return violations
+    }
+
     func validateTypeName(kind: SwiftDeclarationKind, dict: XPCDictionary) -> [StyleViolation] {
         let typeKinds: [SwiftDeclarationKind] = [
             .Class,