libSyntax: create a basic infrastructure for generating libSyntax entities by using Parser.

include/swift/Parse/Parser.h

@@ -25,6 +25,8 @@
 #include "swift/AST/Module.h"
 #include "swift/AST/Pattern.h"
 #include "swift/AST/Stmt.h"
+#include "swift/Syntax/RawTokenSyntax.h"
+#include "swift/Syntax/SyntaxParsingContext.h"
 #include "swift/Basic/OptionSet.h"
 #include "swift/Parse/Lexer.h"
 #include "swift/Parse/LocalContext.h"
@@ -325,6 +327,9 @@ public:
   /// This vector is managed by \c StructureMarkerRAII objects.
   llvm::SmallVector<StructureMarker, 16> StructureMarkers;
 
+  /// Current syntax parsing context where call backs should be directed to.
+  syntax::SyntaxParsingContext *SyntaxContext;
+
 public:
   Parser(unsigned BufferID, SourceFile &SF, SILParserTUStateBase *SIL,
          PersistentParserState *PersistentState = nullptr);
@@ -1417,6 +1422,11 @@ tokenizeWithTrivia(const LangOptions &LangOpts,
                    unsigned Offset = 0,
                    unsigned EndOffset = 0);
 
+
+void populateTokenSyntaxMap(const LangOptions &LangOpts,
+                            const SourceManager &SM,
+                            unsigned BufferID,
+                            std::vector<syntax::RawTokenInfo> &Result);
 } // end namespace swift
 
 #endif