Fix how YAML I/O detects flow sequences.

Update test case to verify flow sequence is
written as a flow sequence.

llvm-svn: 171514

llvm/include/llvm/Support/YAMLTraits.h

@@ -276,20 +276,9 @@ public:
 
 
 // Test if SequenceTraits<T> is defined on type T
-// and SequenceTraits<T>::flow is *not* defined.
 template<typename T>
 struct has_SequenceTraits : public  llvm::integral_constant<bool,
-                                         has_SequenceMethodTraits<T>::value
-                                      && !has_FlowTraits<T>::value > { };
-
-
-// Test if SequenceTraits<T> is defined on type T
-// and SequenceTraits<T>::flow is defined.
-template<typename T>
-struct has_FlowSequenceTraits : public llvm::integral_constant<bool,
-                                         has_SequenceMethodTraits<T>::value
-                                      && has_FlowTraits<T>::value > { };
-
+                                      has_SequenceMethodTraits<T>::value > { };
 
 
 // Test if DocumentListTraits<T> is defined on type T
@@ -318,7 +307,6 @@ struct missingTraits : public  llvm::integral_constant<bool,
                                       && !has_ScalarTraits<T>::value
                                       && !has_MappingTraits<T>::value
                                       && !has_SequenceTraits<T>::value
-                                      && !has_FlowSequenceTraits<T>::value
                                       && !has_DocumentListTraits<T>::value >  {};
 
 
@@ -510,35 +498,33 @@ yamlize(IO &io, T &Val, bool) {
 template<typename T>
 typename llvm::enable_if_c<has_SequenceTraits<T>::value,void>::type
 yamlize(IO &io, T &Seq, bool) {
-  unsigned incount = io.beginSequence();
-  unsigned count = io.outputting() ? SequenceTraits<T>::size(io, Seq) : incount;
-  for(unsigned i=0; i < count; ++i) {
-    void *SaveInfo;
-    if ( io.preflightElement(i, SaveInfo) ) {
-      yamlize(io, SequenceTraits<T>::element(io, Seq, i), true);
-      io.postflightElement(SaveInfo);
+  if ( has_FlowTraits< SequenceTraits<T> >::value ) {
+    unsigned incnt = io.beginFlowSequence();
+    unsigned count = io.outputting() ? SequenceTraits<T>::size(io, Seq) : incnt;
+    for(unsigned i=0; i < count; ++i) {
+      void *SaveInfo;
+      if ( io.preflightFlowElement(i, SaveInfo) ) {
+        yamlize(io, SequenceTraits<T>::element(io, Seq, i), true);
+        io.postflightFlowElement(SaveInfo);
+      }
     }
+    io.endFlowSequence();
   }
-  io.endSequence();
-}
-
-template<typename T>
-typename llvm::enable_if_c<has_FlowSequenceTraits<T>::value,void>::type
-yamlize(IO &io, T &Seq, bool) {
-  unsigned incount = io.beginFlowSequence();
-  unsigned count = io.outputting() ? SequenceTraits<T>::size(io, Seq) : incount;
-  for(unsigned i=0; i < count; ++i) {
-    void *SaveInfo;
-    if ( io.preflightFlowElement(i, SaveInfo) ) {
-      yamlize(io, SequenceTraits<T>::element(io, Seq, i), true);
-      io.postflightFlowElement(SaveInfo);
+  else {
+    unsigned incnt = io.beginSequence();
+    unsigned count = io.outputting() ? SequenceTraits<T>::size(io, Seq) : incnt;
+    for(unsigned i=0; i < count; ++i) {
+      void *SaveInfo;
+      if ( io.preflightElement(i, SaveInfo) ) {
+        yamlize(io, SequenceTraits<T>::element(io, Seq, i), true);
+        io.postflightElement(SaveInfo);
+      }
     }
+    io.endSequence();
   }
-  io.endFlowSequence();
 }
 
 
-
 template<>
 struct ScalarTraits<bool> {
   static void output(const bool &, void*, llvm::raw_ostream &);

llvm/lib/Support/YAMLTraits.cpp

@@ -411,8 +411,8 @@ void Output::postflightElement(void *) {
 }
 
 unsigned Output::beginFlowSequence() {
-  this->newLineCheck();
   StateStack.push_back(inFlowSeq);
+  this->newLineCheck();
   ColumnAtFlowStart = Column;
   output("[ ");
   NeedFlowSequenceComma = false;

llvm/unittests/Support/YAMLIOTest.cpp

@@ -600,8 +600,14 @@ TEST(YAMLIO, TestReadWriteMyFlowSequence) {
     map.numbers.push_back(1024);
 
     llvm::raw_string_ostream ostr(intermediate);
-    Output yout(ostr);
+    Output yout(ostr); 
     yout << map;
+    
+    // Verify sequences were written in flow style
+    ostr.flush();
+    llvm::StringRef flowOut(intermediate);
+    EXPECT_NE(llvm::StringRef::npos, flowOut.find("one, two"));
+    EXPECT_NE(llvm::StringRef::npos, flowOut.find("10, -30, 1024"));
   }
 
   {
@@ -632,7 +638,7 @@ LLVM_YAML_STRONG_TYPEDEF(uint32_t, TotalSeconds)
 
 typedef std::vector<TotalSeconds> SecondsSequence;
 
-LLVM_YAML_IS_FLOW_SEQUENCE_VECTOR(TotalSeconds)
+LLVM_YAML_IS_SEQUENCE_VECTOR(TotalSeconds)
 
 
 namespace llvm {
@@ -745,7 +751,7 @@ struct KindAndFlags {
 
 typedef std::vector<KindAndFlags> KindAndFlagsSequence;
 
-LLVM_YAML_IS_FLOW_SEQUENCE_VECTOR(KindAndFlags)
+LLVM_YAML_IS_SEQUENCE_VECTOR(KindAndFlags)
 
 namespace llvm {
 namespace yaml {