CppEditor: Move CppEditorWidget::linkToSymbol to CppTools

* Cuts direct dependency to CPlusPlus from cppeditor.h, but
  cppfunctiondecldeflink.h still pulls it in.

* Cuts direct dependency to
  cppeditor.h from cppvirtualfunctionassistprovider.cpp, but it still
  depends on cppeditorconstants.h.

* Cuts direct dependency to cppeditor.h from cppelementevaluator.cpp.

The long-term goal is to make the CppEditor independent from concrete
code model backends.

Change-Id: I291ee0d0da5fc5ed1a839a763fe7be11dcf7a6fb
Reviewed-by: Marco Bubke <marco.bubke@theqtcompany.com>

src/plugins/cpptools/cpptoolsreuse.cpp

@@ -227,4 +227,26 @@ const Macro *findCanonicalMacro(const QTextCursor &cursor, Document::Ptr documen
     return 0;
 }
 
+TextEditor::TextEditorWidget::Link linkToSymbol(Symbol *symbol)
+{
+    typedef TextEditor::TextEditorWidget::Link Link;
+
+    if (!symbol)
+        return Link();
+
+    const QString filename = QString::fromUtf8(symbol->fileName(),
+                                               symbol->fileNameLength());
+
+    unsigned line = symbol->line();
+    unsigned column = symbol->column();
+
+    if (column)
+        --column;
+
+    if (symbol->isGenerated())
+        column = 0;
+
+    return Link(filename, line, column);
+}
+
 } // CppTools

src/plugins/cpptools/cpptoolsreuse.h

@@ -33,6 +33,8 @@
 
 #include "cpptools_global.h"
 
+#include <texteditor/texteditor.h>
+
 #include <cplusplus/CppDocument.h>
 
 QT_BEGIN_NAMESPACE
@@ -59,6 +61,8 @@ bool CPPTOOLS_EXPORT isValidFirstIdentifierChar(const QChar &ch);
 bool CPPTOOLS_EXPORT isValidIdentifierChar(const QChar &ch);
 bool CPPTOOLS_EXPORT isValidIdentifier(const QString &s);
 
+TextEditor::TextEditorWidget::Link CPPTOOLS_EXPORT linkToSymbol(CPlusPlus::Symbol *symbol);
+
 QString CPPTOOLS_EXPORT identifierUnderCursor(QTextCursor *cursor);
 
 bool CPPTOOLS_EXPORT isOwnershipRAIIType(CPlusPlus::Symbol *symbol,