If fixits appear to overlap, move the second one over in the output.

This occurs when you have two insertions and the first one is so long that the
second fixit's column is before the first fixit ends. The edits themselves
don't actually overlap, but our command-line preview does.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@158229 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Frontend/TextDiagnostic.cpp b/lib/Frontend/TextDiagnostic.cpp
index 99e89f246bfc0a9731db86326f711299b92978b5..5c8da05c7bba2f6e996aad059a1c335e65e2c738 100644 (file)
--- a/lib/Frontend/TextDiagnostic.cpp
+++ b/lib/Frontend/TextDiagnostic.cpp
@@ -1090,6 +1090,7 @@ std::string TextDiagnostic::buildFixItInsertionLine(
   std::string FixItInsertionLine;
   if (Hints.empty() || !DiagOpts.ShowFixits)
     return FixItInsertionLine;
+  unsigned PrevHintEnd = 0;
 
   for (ArrayRef<FixItHint>::iterator I = Hints.begin(), E = Hints.end();
        I != E; ++I) {
@@ -1107,6 +1108,16 @@ std::string TextDiagnostic::buildFixItInsertionLine(
         assert(HintColNo<static_cast<unsigned>(map.bytes())+1);
         HintColNo = map.byteToColumn(HintColNo);
 
+        // If we inserted a long previous hint, push this one forwards, and add
+        // an extra space to show that this is not part of the previous
+        // completion. This is sort of the best we can do when two hints appear
+        // to overlap.
+        //
+        // Note that if this hint is located immediately after the previous
+        // hint, no space will be added, since the location is more important.
+        if (HintColNo < PrevHintEnd)
+          HintColNo = PrevHintEnd + 1;
+
         // FIXME: if the fixit includes tabs or other characters that do not
         //  take up a single column per byte when displayed then
         //  I->CodeToInsert.size() is not a column number and we're mixing
@@ -1115,19 +1126,16 @@ std::string TextDiagnostic::buildFixItInsertionLine(
         unsigned LastColumnModified
           = HintColNo + I->CodeToInsert.size();
 
-        if (LastColumnModified > static_cast<unsigned>(map.bytes())) {
-          unsigned LastExistingColumn = map.byteToColumn(map.bytes());
-          unsigned AddedColumns = LastColumnModified-LastExistingColumn;
-          LastColumnModified = LastExistingColumn + AddedColumns;
-        } else {
+        if (LastColumnModified <= static_cast<unsigned>(map.bytes()))
           LastColumnModified = map.byteToColumn(LastColumnModified);
-        }
 
         if (LastColumnModified > FixItInsertionLine.size())
           FixItInsertionLine.resize(LastColumnModified, ' ');
         assert(HintColNo+I->CodeToInsert.size() <= FixItInsertionLine.size());
         std::copy(I->CodeToInsert.begin(), I->CodeToInsert.end(),
                   FixItInsertionLine.begin() + HintColNo);
+
+        PrevHintEnd = LastColumnModified;
       } else {
         FixItInsertionLine.clear();
         break;