[libclang] Introduce clang_Cursor_getSpellingNameRange().

It retrieves a source range for a piece that forms the cursors spelling name.
Most of the times there is only one range for the complete spelling but for
objc methods and objc message expressions, there are multiple pieces for each
selector identifier.

Part of rdar://11113120

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@153775 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 73 insertions, 3 deletions

diff --git a/tools/c-index-test/c-index-test.c b/tools/c-index-test/c-index-test.c
index 5dd9254631..e774e78086 100644
--- a/tools/c-index-test/c-index-test.c
+++ b/tools/c-index-test/c-index-test.c
@@ -171,7 +171,8 @@ static void PrintRange(CXSourceRange R, const char *str) {
   if (!begin_file || !end_file)
     return;
 
-  printf(" %s=", str);
+  if (str)
+    printf(" %s=", str);
   PrintExtent(stdout, begin_line, begin_column, end_line, end_column);
 }
 
@@ -1449,8 +1450,19 @@ static int inspect_cursor_at(int argc, const char **argv) {
         PrintCursorExtent(Cursor);
         Spelling = clang_getCursorSpelling(Cursor);
         cspell = clang_getCString(Spelling);
-        if (cspell && strlen(cspell) != 0)
-          printf(" Spelling=%s", cspell);
+        if (cspell && strlen(cspell) != 0) {
+          unsigned pieceIndex;
+          CXSourceRange range, extent;
+          extent = clang_getCursorExtent(Cursor);
+          printf(" Spelling=%s (", cspell);
+          for (pieceIndex = 0; ; ++pieceIndex) {
+            range = clang_Cursor_getSpellingNameRange(Cursor, pieceIndex, 0);
+            if (clang_Range_isNull(range))
+              break;
+            PrintRange(range, 0);
+          }
+          printf(")");
+        }
         clang_disposeString(Spelling);
         if (completionString != NULL) {
           printf("\nCompletion string: ");
diff --git a/tools/libclang/CIndex.cpp b/tools/libclang/CIndex.cpp
index 2a05b1b6f7..c63a969fe4 100644
--- a/tools/libclang/CIndex.cpp
+++ b/tools/libclang/CIndex.cpp
@@ -3167,6 +3167,63 @@ CXString clang_getCursorSpelling(CXCursor C) {
   return createCXString("");
 }
 
+CXSourceRange clang_Cursor_getSpellingNameRange(CXCursor C,
+                                                unsigned pieceIndex,
+                                                unsigned options) {
+  if (clang_Cursor_isNull(C))
+    return clang_getNullRange();
+
+  ASTContext &Ctx = getCursorContext(C);
+
+  if (clang_isStatement(C.kind)) {
+    Stmt *S = getCursorStmt(C);
+    if (LabelStmt *Label = dyn_cast_or_null<LabelStmt>(S)) {
+      if (pieceIndex > 0)
+        return clang_getNullRange();
+      return cxloc::translateSourceRange(Ctx, Label->getIdentLoc());
+    }
+
+    return clang_getNullRange();
+  }
+
+  if (C.kind == CXCursor_ObjCMessageExpr) {
+    if (ObjCMessageExpr *
+          ME = dyn_cast_or_null<ObjCMessageExpr>(getCursorExpr(C))) {
+      if (pieceIndex >= ME->getNumSelectorLocs())
+        return clang_getNullRange();
+      return cxloc::translateSourceRange(Ctx, ME->getSelectorLoc(pieceIndex));
+    }
+  }
+
+  if (C.kind == CXCursor_ObjCInstanceMethodDecl ||
+      C.kind == CXCursor_ObjCClassMethodDecl) {
+    if (ObjCMethodDecl *
+          MD = dyn_cast_or_null<ObjCMethodDecl>(getCursorDecl(C))) {
+      if (pieceIndex >= MD->getNumSelectorLocs())
+        return clang_getNullRange();
+      return cxloc::translateSourceRange(Ctx, MD->getSelectorLoc(pieceIndex));
+    }
+  }
+
+  // FIXME: A CXCursor_InclusionDirective should give the location of the
+  // filename, but we don't keep track of this.
+
+  // FIXME: A CXCursor_AnnotateAttr should give the location of the annotation
+  // but we don't keep track of this.
+
+  // FIXME: A CXCursor_AsmLabelAttr should give the location of the label
+  // but we don't keep track of this.
+
+  // Default handling, give the location of the cursor.
+
+  if (pieceIndex > 0)
+    return clang_getNullRange();
+
+  CXSourceLocation CXLoc = clang_getCursorLocation(C);
+  SourceLocation Loc = cxloc::translateSourceLocation(CXLoc);
+  return cxloc::translateSourceRange(Ctx, Loc);
+}
+
 CXString clang_getCursorDisplayName(CXCursor C) {
   if (!clang_isDeclaration(C.kind))
     return clang_getCursorSpelling(C);
diff --git a/tools/libclang/libclang.exports b/tools/libclang/libclang.exports
index 21861fb709..2fe3f1d53c 100644
--- a/tools/libclang/libclang.exports
+++ b/tools/libclang/libclang.exports
@@ -4,6 +4,7 @@ clang_CXIndex_getGlobalOptions
 clang_CXIndex_setGlobalOptions
 clang_CXXMethod_isStatic
 clang_CXXMethod_isVirtual
+clang_Cursor_getSpellingNameRange
 clang_Cursor_getTranslationUnit
 clang_Cursor_isNull
 clang_IndexAction_create