Allow using MemoryBuffers with yaml::Stream directly.

The rationale is to get YAML filenames in diagnostics from
yaml::Stream::printError -- currently the filename is hard-coded as
"YAML" because there's no buffer information available.

Patch by Kim Gräsman!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168341 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 20 insertions, 0 deletions

diff --git a/lib/Support/YAMLParser.cpp b/lib/Support/YAMLParser.cpp
index 34df636a72..2ae33f5b99 100644
--- a/lib/Support/YAMLParser.cpp
+++ b/lib/Support/YAMLParser.cpp
@@ -252,6 +252,7 @@ namespace yaml {
 class Scanner {
 public:
   Scanner(const StringRef Input, SourceMgr &SM);
+  Scanner(MemoryBuffer *Buffer, SourceMgr &SM_);
 
   /// @brief Parse the next token and return it without popping it.
   Token &peekNext();
@@ -708,6 +709,21 @@ Scanner::Scanner(StringRef Input, SourceMgr &sm)
   End = InputBuffer->getBufferEnd();
 }
 
+Scanner::Scanner(MemoryBuffer *Buffer, SourceMgr &SM_)
+  : SM(SM_)
+  , InputBuffer(Buffer)
+  , Current(InputBuffer->getBufferStart())
+  , End(InputBuffer->getBufferEnd())
+  , Indent(-1)
+  , Column(0)
+  , Line(0)
+  , FlowLevel(0)
+  , IsStartOfStream(true)
+  , IsSimpleKeyAllowed(true)
+  , Failed(false) {
+    SM.AddNewSourceBuffer(InputBuffer, SMLoc());
+}
+
 Token &Scanner::peekNext() {
   // If the current token is a possible simple key, keep parsing until we
   // can confirm.
@@ -1532,6 +1548,10 @@ Stream::Stream(StringRef Input, SourceMgr &SM)
   : scanner(new Scanner(Input, SM))
   , CurrentDoc(0) {}
 
+Stream::Stream(MemoryBuffer *InputBuffer, SourceMgr &SM)
+  : scanner(new Scanner(InputBuffer, SM))
+  , CurrentDoc(0) {}
+
 Stream::~Stream() {}
 
 bool Stream::failed() { return scanner->failed(); }