Clang: Use LineColumn instead of explicit integers for line and column

With OptionalLineColumn we don't need any bool return parameter any more.

Change-Id: I6f57f221c1bfdf08a92a87a7d71ea0eecf83dbcf
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/libs/utils/linecolumn.h

@@ -25,6 +25,10 @@
 
 #pragma once
 
+#include "optional.h"
+
+namespace Utils {
+
 class LineColumn
 {
 public:
@@ -34,11 +38,10 @@ public:
           column(column)
     {}
 
-    bool isValid() const
-    {
-        return line >= 0 && column >= 0;
-    }
-
     int line = -1;
     int column = -1;
 };
+
+using OptionalLineColumn = optional<LineColumn>;
+
+} // namespace Utils

src/libs/utils/textutils.cpp

@@ -46,6 +46,18 @@ bool convertPosition(const QTextDocument *document, int pos, int *line, int *col
     }
 }
 
+Utils::OptionalLineColumn convertPosition(const QTextDocument *document, int pos)
+{
+    Utils::OptionalLineColumn optional;
+
+    QTextBlock block = document->findBlock(pos);
+
+    if (block.isValid())
+        optional.emplace(block.blockNumber() + 1, pos - block.position());
+
+    return optional;
+}
+
 QString textAt(QTextCursor tc, int pos, int length)
 {
     if (pos < 0)

src/libs/utils/textutils.h

@@ -25,6 +25,7 @@
 
 #pragma once
 
+#include "linecolumn.h"
 #include "utils_global.h"
 
 #include <QString>
@@ -39,6 +40,8 @@ namespace Text {
 QTCREATOR_UTILS_EXPORT bool convertPosition(const QTextDocument *document,
                                             int pos,
                                             int *line, int *column);
+QTCREATOR_UTILS_EXPORT
+Utils::OptionalLineColumn convertPosition(const QTextDocument *document, int pos);
 
 QTCREATOR_UTILS_EXPORT QString textAt(QTextCursor tc, int pos, int length);
 

src/plugins/clangrefactoring/refactoringengine.cpp

@@ -94,13 +94,20 @@ void RefactoringEngine::startLocalRenaming(const CppTools::CursorInEditor &data,
 
 CppTools::Usages RefactoringEngine::locationsAt(const CppTools::CursorInEditor &data) const
 {
-    int line = 0, column = 0;
+    CppTools::Usages usages;
-    QTextCursor cursor = Utils::Text::wordStartCursor(data.cursor());
-    Utils::Text::convertPosition(cursor.document(), cursor.position(), &line, &column);
 
+    QTextCursor cursor = Utils::Text::wordStartCursor(data.cursor());
+    Utils::OptionalLineColumn lineColumn = Utils::Text::convertPosition(cursor.document(),
+                                                                        cursor.position());
+
+    if (lineColumn) {
         const QByteArray filePath = data.filePath().toString().toUtf8();
         const ClangBackEnd::FilePathId filePathId = m_filePathCache.filePathId(ClangBackEnd::FilePathView(filePath));
-    return m_symbolQuery.sourceUsagesAt(filePathId, line, column + 1);
+
+        usages = m_symbolQuery.sourceUsagesAt(filePathId, lineColumn->line, lineColumn->column + 1);
+    }
+
+    return usages;
 }
 
 void RefactoringEngine::globalRename(const CppTools::CursorInEditor &data,