Move VersionTuple from clang/Basic to llvm/Support

Summary:
This kind of functionality is useful to other project apart from clang.
LLDB works with version numbers a lot, but it does not have a convenient
abstraction for this. Moving this class to a lower level library allows
it to be freely used within LLDB.

Since this class is used in a lot of places in clang, and it used to be
in the clang namespace, it seemed appropriate to add it to the list of
adopted classes in LLVM.h to avoid prefixing all uses with "llvm::".

Also, I didn't find any tests specific for this class, so I wrote a
couple of quick ones for the more interesting bits of functionality.

Reviewers: zturner, erik.pilkington

Subscribers: mgorny, cfe-commits, llvm-commits

Differential Revision: https://reviews.llvm.org/D47887

llvm-svn: 334399

clang/include/clang/AST/Attr.h

@@ -23,9 +23,9 @@
 #include "clang/Basic/OpenMPKinds.h"
 #include "clang/Basic/Sanitizers.h"
 #include "clang/Basic/SourceLocation.h"
-#include "clang/Basic/VersionTuple.h"
 #include "llvm/ADT/StringSwitch.h"
 #include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/VersionTuple.h"
 #include "llvm/Support/raw_ostream.h"
 #include <algorithm>
 #include <cassert>

clang/include/clang/AST/Availability.h

@@ -15,8 +15,8 @@
 #define LLVM_CLANG_AST_AVAILABILITY_H
 
 #include "clang/Basic/SourceLocation.h"
-#include "clang/Basic/VersionTuple.h"
 #include "llvm/ADT/StringRef.h"
+#include "llvm/Support/VersionTuple.h"
 
 namespace clang {
 

clang/include/clang/AST/DeclBase.h

@@ -19,7 +19,6 @@
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/Specifiers.h"
-#include "clang/Basic/VersionTuple.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/PointerIntPair.h"
 #include "llvm/ADT/PointerUnion.h"
@@ -28,6 +27,7 @@
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/PrettyStackTrace.h"
+#include "llvm/Support/VersionTuple.h"
 #include <algorithm>
 #include <cassert>
 #include <cstddef>

clang/include/clang/AST/ExprObjC.h

@@ -25,7 +25,6 @@
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/Specifiers.h"
-#include "clang/Basic/VersionTuple.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/None.h"
 #include "llvm/ADT/Optional.h"
@@ -36,6 +35,7 @@
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/TrailingObjects.h"
+#include "llvm/Support/VersionTuple.h"
 #include "llvm/Support/type_traits.h"
 #include <cassert>
 #include <cstddef>

clang/include/clang/Basic/AlignedAllocation.h

@@ -16,9 +16,9 @@
 #ifndef LLVM_CLANG_BASIC_ALIGNED_ALLOCATION_H
 #define LLVM_CLANG_BASIC_ALIGNED_ALLOCATION_H
 
-#include "clang/Basic/VersionTuple.h"
 #include "llvm/ADT/Triple.h"
 #include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/VersionTuple.h"
 
 namespace clang {
 

clang/include/clang/Basic/LLVM.h

@@ -28,6 +28,7 @@ namespace llvm {
   // ADT's.
   class StringRef;
   class Twine;
+  class VersionTuple;
   template<typename T> class ArrayRef;
   template<typename T> class MutableArrayRef;
   template<typename T> class OwningArrayRef;
@@ -60,17 +61,18 @@ namespace clang {
   using llvm::cast_or_null;
   
   // ADT's.
-  using llvm::None;
-  using llvm::Optional;
-  using llvm::StringRef;
-  using llvm::Twine;
   using llvm::ArrayRef;
   using llvm::MutableArrayRef;
+  using llvm::None;
+  using llvm::Optional;
   using llvm::OwningArrayRef;
+  using llvm::SaveAndRestore;
   using llvm::SmallString;
   using llvm::SmallVector;
   using llvm::SmallVectorImpl;
-  using llvm::SaveAndRestore;
+  using llvm::StringRef;
+  using llvm::Twine;
+  using llvm::VersionTuple;
 
   // Error handling.
   using llvm::Expected;

clang/include/clang/Basic/ObjCRuntime.h

@@ -16,10 +16,10 @@
 #define LLVM_CLANG_BASIC_OBJCRUNTIME_H
 
 #include "clang/Basic/LLVM.h"
-#include "clang/Basic/VersionTuple.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/Triple.h"
 #include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/VersionTuple.h"
 #include <string>
 
 namespace clang {

clang/include/clang/Basic/TargetInfo.h

@@ -20,7 +20,6 @@
 #include "clang/Basic/Specifiers.h"
 #include "clang/Basic/TargetCXXABI.h"
 #include "clang/Basic/TargetOptions.h"
-#include "clang/Basic/VersionTuple.h"
 #include "llvm/ADT/APInt.h"
 #include "llvm/ADT/IntrusiveRefCntPtr.h"
 #include "llvm/ADT/Optional.h"
@@ -30,6 +29,7 @@
 #include "llvm/ADT/Triple.h"
 #include "llvm/IR/DataLayout.h"
 #include "llvm/Support/DataTypes.h"
+#include "llvm/Support/VersionTuple.h"
 #include <cassert>
 #include <string>
 #include <vector>

clang/include/clang/Driver/ToolChain.h

@@ -12,7 +12,6 @@
 
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/Sanitizers.h"
-#include "clang/Basic/VersionTuple.h"
 #include "clang/Driver/Action.h"
 #include "clang/Driver/Multilib.h"
 #include "clang/Driver/Types.h"
@@ -22,6 +21,7 @@
 #include "llvm/ADT/Triple.h"
 #include "llvm/MC/MCTargetOptions.h"
 #include "llvm/Option/Option.h"
+#include "llvm/Support/VersionTuple.h"
 #include "llvm/Target/TargetOptions.h"
 #include <cassert>
 #include <memory>

clang/include/clang/Parse/Parser.h

@@ -45,7 +45,6 @@ namespace clang {
   class ColonProtectionRAIIObject;
   class InMessageExpressionRAIIObject;
   class PoisonSEHIdentifiersRAIIObject;
-  class VersionTuple;
   class OMPClause;
   class ObjCTypeParamList;
   class ObjCTypeParameter;

clang/include/clang/Sema/AttributeList.h

@@ -18,11 +18,11 @@
 #include "clang/Basic/AttrSubjectMatchRules.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/TargetInfo.h"
-#include "clang/Basic/VersionTuple.h"
 #include "clang/Sema/Ownership.h"
 #include "llvm/ADT/PointerUnion.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/Support/Allocator.h"
+#include "llvm/Support/VersionTuple.h"
 #include <cassert>
 #include <cstddef>
 #include <cstring>

clang/include/clang/Serialization/ASTReader.h

@@ -28,7 +28,6 @@
 #include "clang/Basic/OpenCLOptions.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/Version.h"
-#include "clang/Basic/VersionTuple.h"
 #include "clang/Lex/ExternalPreprocessorSource.h"
 #include "clang/Lex/HeaderSearch.h"
 #include "clang/Lex/PreprocessingRecord.h"
@@ -62,6 +61,7 @@
 #include "llvm/Support/Endian.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Timer.h"
+#include "llvm/Support/VersionTuple.h"
 #include <cassert>
 #include <cstddef>
 #include <cstdint>

clang/include/clang/Serialization/ASTWriter.h

@@ -93,7 +93,6 @@ class SwitchCase;
 class TemplateParameterList;
 class Token;
 class TypeSourceInfo;
-class VersionTuple;
 
 /// Writes an AST file containing the contents of a translation unit.
 ///

clang/lib/AST/DeclBase.cpp

@@ -34,7 +34,6 @@
 #include "clang/Basic/PartialDiagnostic.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/TargetInfo.h"
-#include "clang/Basic/VersionTuple.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/PointerIntPair.h"
 #include "llvm/ADT/SmallVector.h"
@@ -42,6 +41,7 @@
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/MathExtras.h"
+#include "llvm/Support/VersionTuple.h"
 #include "llvm/Support/raw_ostream.h"
 #include <algorithm>
 #include <cassert>

clang/lib/Basic/CMakeLists.txt

@@ -93,7 +93,6 @@ add_clang_library(clangBasic
   Targets/XCore.cpp
   TokenKinds.cpp
   Version.cpp
-  VersionTuple.cpp
   VirtualFileSystem.cpp
   Warnings.cpp
   XRayInstr.cpp

clang/lib/Basic/ObjCRuntime.cpp

@@ -13,8 +13,8 @@
 //===----------------------------------------------------------------------===//
 
 #include "clang/Basic/ObjCRuntime.h"
-#include "clang/Basic/VersionTuple.h"
 #include "llvm/ADT/StringRef.h"
+#include "llvm/Support/VersionTuple.h"
 #include "llvm/Support/raw_ostream.h"
 #include <cstddef>
 #include <string>

clang/lib/Driver/ToolChain.cpp

@@ -13,7 +13,6 @@
 #include "ToolChains/Clang.h"
 #include "clang/Basic/ObjCRuntime.h"
 #include "clang/Basic/Sanitizers.h"
-#include "clang/Basic/VersionTuple.h"
 #include "clang/Basic/VirtualFileSystem.h"
 #include "clang/Config/config.h"
 #include "clang/Driver/Action.h"
@@ -29,6 +28,7 @@
 #include "llvm/ADT/Triple.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/Config/llvm-config.h"
+#include "llvm/MC/MCTargetOptions.h"
 #include "llvm/Option/Arg.h"
 #include "llvm/Option/ArgList.h"
 #include "llvm/Option/OptTable.h"
@@ -36,9 +36,9 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Path.h"
-#include "llvm/MC/MCTargetOptions.h"
 #include "llvm/Support/TargetParser.h"
 #include "llvm/Support/TargetRegistry.h"
+#include "llvm/Support/VersionTuple.h"
 #include <cassert>
 #include <cstddef>
 #include <cstring>

clang/lib/Driver/ToolChains/Cuda.h

@@ -11,14 +11,14 @@
 #define LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_CUDA_H
 
 #include "clang/Basic/Cuda.h"
-#include "clang/Basic/VersionTuple.h"
 #include "clang/Driver/Action.h"
 #include "clang/Driver/Multilib.h"
-#include "clang/Driver/ToolChain.h"
 #include "clang/Driver/Tool.h"
+#include "clang/Driver/ToolChain.h"
 #include "llvm/ADT/Optional.h"
 #include "llvm/ADT/SmallSet.h"
 #include "llvm/Support/Compiler.h"
+#include "llvm/Support/VersionTuple.h"
 #include <set>
 #include <vector>
 

clang/lib/Frontend/CompilerInvocation.cpp

@@ -23,7 +23,6 @@
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/TargetOptions.h"
 #include "clang/Basic/Version.h"
-#include "clang/Basic/VersionTuple.h"
 #include "clang/Basic/VirtualFileSystem.h"
 #include "clang/Basic/Visibility.h"
 #include "clang/Basic/XRayInstr.h"
@@ -76,6 +75,7 @@
 #include "llvm/Support/Path.h"
 #include "llvm/Support/Process.h"
 #include "llvm/Support/Regex.h"
+#include "llvm/Support/VersionTuple.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetOptions.h"
 #include <algorithm>

clang/lib/Serialization/ASTReader.cpp

@@ -61,7 +61,6 @@
 #include "clang/Basic/TargetOptions.h"
 #include "clang/Basic/TokenKinds.h"
 #include "clang/Basic/Version.h"
-#include "clang/Basic/VersionTuple.h"
 #include "clang/Frontend/PCHContainerOperations.h"
 #include "clang/Lex/HeaderSearch.h"
 #include "clang/Lex/HeaderSearchOptions.h"
@@ -104,8 +103,8 @@
 #include "llvm/ADT/iterator_range.h"
 #include "llvm/Bitcode/BitstreamReader.h"
 #include "llvm/Support/Casting.h"
-#include "llvm/Support/Compression.h"
 #include "llvm/Support/Compiler.h"
+#include "llvm/Support/Compression.h"
 #include "llvm/Support/DJB.h"
 #include "llvm/Support/Endian.h"
 #include "llvm/Support/Error.h"
@@ -115,6 +114,7 @@
 #include "llvm/Support/Path.h"
 #include "llvm/Support/SaveAndRestore.h"
 #include "llvm/Support/Timer.h"
+#include "llvm/Support/VersionTuple.h"
 #include "llvm/Support/raw_ostream.h"
 #include <algorithm>
 #include <cassert>

clang/lib/Serialization/ASTWriter.cpp

@@ -53,7 +53,6 @@
 #include "clang/Basic/TargetInfo.h"
 #include "clang/Basic/TargetOptions.h"
 #include "clang/Basic/Version.h"
-#include "clang/Basic/VersionTuple.h"
 #include "clang/Lex/HeaderSearch.h"
 #include "clang/Lex/HeaderSearchOptions.h"
 #include "clang/Lex/MacroInfo.h"
@@ -97,6 +96,7 @@
 #include "llvm/Support/OnDiskHashTable.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/SHA1.h"
+#include "llvm/Support/VersionTuple.h"
 #include "llvm/Support/raw_ostream.h"
 #include <algorithm>
 #include <cassert>

lldb/source/Plugins/Platform/MacOSX/PlatformDarwin.cpp

@@ -16,8 +16,6 @@
 #include <algorithm>
 #include <mutex>
 
-// Other libraries and framework includes
-#include "clang/Basic/VersionTuple.h"
 // Project includes
 #include "lldb/Breakpoint/BreakpointLocation.h"
 #include "lldb/Breakpoint/BreakpointSite.h"
@@ -42,6 +40,7 @@
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Threading.h"
+#include "llvm/Support/VersionTuple.h"
 
 #if defined(__APPLE__)
 #include <TargetConditionals.h> // for TARGET_OS_TV, TARGET_OS_WATCH
@@ -1612,19 +1611,19 @@ void PlatformDarwin::AddClangModuleCompilationOptionsForSDKType(
     case SDKType::iPhoneOS:
       minimum_version_option.PutCString("-mios-version-min=");
       minimum_version_option.PutCString(
-          clang::VersionTuple(versions[0], versions[1], versions[2])
+          llvm::VersionTuple(versions[0], versions[1], versions[2])
               .getAsString());
       break;
     case SDKType::iPhoneSimulator:
       minimum_version_option.PutCString("-mios-simulator-version-min=");
       minimum_version_option.PutCString(
-          clang::VersionTuple(versions[0], versions[1], versions[2])
+          llvm::VersionTuple(versions[0], versions[1], versions[2])
               .getAsString());
       break;
     case SDKType::MacOSX:
       minimum_version_option.PutCString("-mmacosx-version-min=");
       minimum_version_option.PutCString(
-          clang::VersionTuple(versions[0], versions[1], versions[2])
+          llvm::VersionTuple(versions[0], versions[1], versions[2])
               .getAsString());
     }
     options.push_back(minimum_version_option.GetString());

llvm/include/llvm/Support/VersionTuple.h

@@ -8,19 +8,20 @@
 //===----------------------------------------------------------------------===//
 ///
 /// \file
-/// Defines the clang::VersionTuple class, which represents a version in
+/// Defines the llvm::VersionTuple class, which represents a version in
 /// the form major[.minor[.subminor]].
 ///
 //===----------------------------------------------------------------------===//
-#ifndef LLVM_CLANG_BASIC_VERSIONTUPLE_H
-#define LLVM_CLANG_BASIC_VERSIONTUPLE_H
+#ifndef LLVM_SUPPORT_VERSIONTUPLE_H
+#define LLVM_SUPPORT_VERSIONTUPLE_H
 
-#include "clang/Basic/LLVM.h"
 #include "llvm/ADT/Optional.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/raw_ostream.h"
 #include <string>
 #include <tuple>
 
-namespace clang {
+namespace llvm {
 
 /// Represents a version number in the form major[.minor[.subminor[.build]]].
 class VersionTuple {
@@ -86,17 +87,17 @@ public:
       return None;
     return Build;
   }
-  
+
   /// Determine if two version numbers are equivalent. If not
   /// provided, minor and subminor version numbers are considered to be zero.
-  friend bool operator==(const VersionTuple& X, const VersionTuple &Y) {
+  friend bool operator==(const VersionTuple &X, const VersionTuple &Y) {
     return X.Major == Y.Major && X.Minor == Y.Minor &&
            X.Subminor == Y.Subminor && X.Build == Y.Build;
   }
 
   /// Determine if two version numbers are not equivalent.
   ///
-  /// If not provided, minor and subminor version numbers are considered to be 
+  /// If not provided, minor and subminor version numbers are considered to be
   /// zero.
   friend bool operator!=(const VersionTuple &X, const VersionTuple &Y) {
     return !(X == Y);
@@ -120,7 +121,7 @@ public:
   }
 
   /// Determine whether one version number precedes or is
-  /// equivalent to another. 
+  /// equivalent to another.
   ///
   /// If not provided, minor and subminor version numbers are considered to be
   /// zero.
@@ -147,7 +148,7 @@ public:
 };
 
 /// Print a version number.
-raw_ostream& operator<<(raw_ostream &Out, const VersionTuple &V);
+raw_ostream &operator<<(raw_ostream &Out, const VersionTuple &V);
 
-} // end namespace clang
-#endif // LLVM_CLANG_BASIC_VERSIONTUPLE_H
+} // end namespace llvm
+#endif // LLVM_SUPPORT_VERSIONTUPLE_H

llvm/lib/Support/CMakeLists.txt

@@ -124,6 +124,7 @@ add_llvm_library(LLVMSupport
   Twine.cpp
   Unicode.cpp
   UnicodeCaseFold.cpp
+  VersionTuple.cpp
   WithColor.cpp
   YAMLParser.cpp
   YAMLTraits.cpp

llvm/lib/Support/VersionTuple.cpp

@@ -11,10 +11,10 @@
 // the form major[.minor[.subminor]].
 //
 //===----------------------------------------------------------------------===//
-#include "clang/Basic/VersionTuple.h"
+#include "llvm/Support/VersionTuple.h"
 #include "llvm/Support/raw_ostream.h"
 
-using namespace clang;
+using namespace llvm;
 
 std::string VersionTuple::getAsString() const {
   std::string Result;
@@ -25,8 +25,7 @@ std::string VersionTuple::getAsString() const {
   return Result;
 }
 
-raw_ostream& clang::operator<<(raw_ostream &Out, 
-                                     const VersionTuple &V) {
+raw_ostream &llvm::operator<<(raw_ostream &Out, const VersionTuple &V) {
   Out << V.getMajor();
   if (Optional<unsigned> Minor = V.getMinor())
     Out << '.' << *Minor;
@@ -39,18 +38,21 @@ raw_ostream& clang::operator<<(raw_ostream &Out,
 
 static bool parseInt(StringRef &input, unsigned &value) {
   assert(value == 0);
-  if (input.empty()) return true;
+  if (input.empty())
+    return true;
 
   char next = input[0];
   input = input.substr(1);
-  if (next < '0' || next > '9') return true;
-  value = (unsigned) (next - '0');
+  if (next < '0' || next > '9')
+    return true;
+  value = (unsigned)(next - '0');
 
   while (!input.empty()) {
     next = input[0];
-    if (next < '0' || next > '9') return false;
+    if (next < '0' || next > '9')
+      return false;
     input = input.substr(1);
-    value = value * 10 + (unsigned) (next - '0');
+    value = value * 10 + (unsigned)(next - '0');
   }
 
   return false;
@@ -60,7 +62,8 @@ bool VersionTuple::tryParse(StringRef input) {
   unsigned major = 0, minor = 0, micro = 0, build = 0;
 
   // Parse the major version, [0-9]+
-  if (parseInt(input, major)) return true;
+  if (parseInt(input, major))
+    return true;
 
   if (input.empty()) {
     *this = VersionTuple(major);
@@ -68,9 +71,11 @@ bool VersionTuple::tryParse(StringRef input) {
   }
 
   // If we're not done, parse the minor version, \.[0-9]+
-  if (input[0] != '.') return true;
+  if (input[0] != '.')
+    return true;
   input = input.substr(1);
-  if (parseInt(input, minor)) return true;
+  if (parseInt(input, minor))
+    return true;
 
   if (input.empty()) {
     *this = VersionTuple(major, minor);
@@ -78,9 +83,11 @@ bool VersionTuple::tryParse(StringRef input) {
   }
 
   // If we're not done, parse the micro version, \.[0-9]+
-  if (input[0] != '.') return true;
+  if (input[0] != '.')
+    return true;
   input = input.substr(1);
-  if (parseInt(input, micro)) return true;
+  if (parseInt(input, micro))
+    return true;
 
   if (input.empty()) {
     *this = VersionTuple(major, minor, micro);
@@ -88,12 +95,15 @@ bool VersionTuple::tryParse(StringRef input) {
   }
 
   // If we're not done, parse the micro version, \.[0-9]+
-  if (input[0] != '.') return true;
+  if (input[0] != '.')
+    return true;
   input = input.substr(1);
-  if (parseInt(input, build)) return true;
+  if (parseInt(input, build))
+    return true;
 
   // If we have characters left over, it's an error.
-  if (!input.empty()) return true;
+  if (!input.empty())
+    return true;
 
   *this = VersionTuple(major, minor, micro, build);
   return false;

llvm/unittests/Support/CMakeLists.txt

@@ -61,6 +61,7 @@ add_llvm_unittest(SupportTests
   TrailingObjectsTest.cpp
   TrigramIndexTest.cpp
   UnicodeTest.cpp
+  VersionTupleTest.cpp
   YAMLIOTest.cpp
   YAMLParserTest.cpp
   formatted_raw_ostream_test.cpp

llvm/unittests/Support/VersionTupleTest.cpp

@@ -0,0 +1,50 @@
+//===- VersionTupleTests.cpp - Version Number Handling Tests --------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/VersionTuple.h"
+#include "gtest/gtest.h"
+
+using namespace llvm;
+
+TEST(VersionTuple, getAsString) {
+  EXPECT_EQ("0", VersionTuple().getAsString());
+  EXPECT_EQ("1", VersionTuple(1).getAsString());
+  EXPECT_EQ("1.2", VersionTuple(1, 2).getAsString());
+  EXPECT_EQ("1.2.3", VersionTuple(1, 2, 3).getAsString());
+  EXPECT_EQ("1.2.3.4", VersionTuple(1, 2, 3, 4).getAsString());
+}
+
+TEST(VersionTuple, tryParse) {
+  VersionTuple VT;
+
+  EXPECT_FALSE(VT.tryParse("1"));
+  EXPECT_EQ("1", VT.getAsString());
+
+  EXPECT_FALSE(VT.tryParse("1.2"));
+  EXPECT_EQ("1.2", VT.getAsString());
+
+  EXPECT_FALSE(VT.tryParse("1.2.3"));
+  EXPECT_EQ("1.2.3", VT.getAsString());
+
+  EXPECT_FALSE(VT.tryParse("1.2.3.4"));
+  EXPECT_EQ("1.2.3.4", VT.getAsString());
+
+  EXPECT_TRUE(VT.tryParse(""));
+  EXPECT_TRUE(VT.tryParse("1."));
+  EXPECT_TRUE(VT.tryParse("1.2."));
+  EXPECT_TRUE(VT.tryParse("1.2.3."));
+  EXPECT_TRUE(VT.tryParse("1.2.3.4."));
+  EXPECT_TRUE(VT.tryParse("1.2.3.4.5"));
+  EXPECT_TRUE(VT.tryParse("1-2"));
+  EXPECT_TRUE(VT.tryParse("1+2"));
+  EXPECT_TRUE(VT.tryParse(".1"));
+  EXPECT_TRUE(VT.tryParse(" 1"));
+  EXPECT_TRUE(VT.tryParse("1 "));
+  EXPECT_TRUE(VT.tryParse("."));
+}