rewriter plugin for removing forward rtl string declarations

Change-Id: I12bf38985ae62756973c05aacf762ae3c405ac9b

compilerplugins/clang/removeforwardstringdecl.cxx

@@ -0,0 +1,76 @@
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * Based on LLVM/Clang.
+ *
+ * This file is distributed under the University of Illinois Open Source
+ * License. See LICENSE.TXT for details.
+ *
+ */
+
+#include "removeforwardstringdecl.hxx"
+
+#include <clang/AST/ASTContext.h>
+#include <clang/Basic/SourceManager.h>
+
+/*
+This is a rewriter.
+
+Remove all forward declarations of rtl strings. I.e. 'namespace rtl { class OUString; }' etc.
+*/
+
+namespace loplugin
+{
+
+RemoveForwardStringDecl::RemoveForwardStringDecl( ASTContext& context, Rewriter& rewriter )
+    : RewritePlugin( context, rewriter )
+    {
+    }
+
+void RemoveForwardStringDecl::run()
+    {
+    TraverseDecl( context.getTranslationUnitDecl());
+    }
+
+bool RemoveForwardStringDecl::VisitNamespaceDecl( NamespaceDecl* declaration )
+    {
+    if( ignoreLocation( declaration ))
+        return true;
+    if( declaration->getQualifiedNameAsString() != "rtl" )
+        return true;
+    bool canRemove = true;
+    for( NamespaceDecl::decl_iterator it = declaration->decls_begin();
+         it != declaration->decls_end();
+         ++it )
+        {
+        if( *it != NULL )
+            {
+            if( !tryRemoveStringForwardDecl( *it ))
+                canRemove = false;
+            }
+        }
+    if( canRemove ) // contained only forward decls that we removed
+        removeText( declaration->getSourceRange(), RemoveLineIfEmpty );
+    return true;
+    }
+
+bool RemoveForwardStringDecl::tryRemoveStringForwardDecl( const Decl* decl )
+    {
+    const CXXRecordDecl* classdecl = dyn_cast< CXXRecordDecl >( decl );
+    if( classdecl == NULL )
+        return false;
+    if( !classdecl->isFreeStanding() || classdecl->isCompleteDefinition())
+        return false; // not a simple forward declaration
+    if( classdecl->getName() == "OString" || classdecl->getName() == "OUString"
+        || classdecl->getName() == "OStringBuffer" || classdecl->getName() == "OUStringBuffer"
+        || classdecl->getName() == "OStringHash" || classdecl->getName() == "OUStringHash"
+        || classdecl->getName() == "OStringLiteral" || classdecl->getName() == "OUStringLiteral" )
+        {
+        removeText( SourceRange( classdecl->getOuterLocStart(), classdecl->getLocEnd()),
+            RemoveLineIfEmpty | RemoveWholeStatement );
+        return true;
+        }
+    return false;
+    }
+
+} // namespace