writerfilter: add RTFLookahead to be able to look ahead during import

Change-Id: I1da765373c352c8a2aa486fe6210b16bf492728c

writerfilter/Library_writerfilter.mk

@@ -79,6 +79,7 @@ $(eval $(call gb_Library_add_exception_objects,writerfilter,\
 	writerfilter/source/rtftok/rtfcontrolwords \
 	writerfilter/source/rtftok/rtfdocumentfactory \
 	writerfilter/source/rtftok/rtfdocumentimpl \
+	writerfilter/source/rtftok/rtflookahead \
 	writerfilter/source/rtftok/rtfreferenceproperties \
 	writerfilter/source/rtftok/rtfreferencetable \
 	writerfilter/source/rtftok/rtfsdrimport \

writerfilter/source/rtftok/rtfdocumentimpl.cxx

@@ -49,6 +49,7 @@
 
 #include <rtfsdrimport.hxx>
 #include <rtftokenizer.hxx>
+#include <rtflookahead.hxx>
 #include <rtfcharsets.hxx>
 #include <rtfreferenceproperties.hxx>
 #include <rtfskipdestination.hxx>
@@ -1679,8 +1680,12 @@ int RTFDocumentImpl::dispatchDestination(RTFKeyword nKeyword)
             m_aStates.top().bInBackground = true;
             break;
         case RTF_SHPGRP:
-            m_aStates.top().nDestinationState = DESTINATION_SHAPEGROUP;
-            m_aStates.top().bInShapeGroup = true;
+            {
+                RTFLookahead aLookahead(Strm(), m_pTokenizer->getGroupStart());
+                SAL_WARN_IF(!aLookahead.hasTable(), "writerfilter", "no table in groupshape, should create it!");
+                m_aStates.top().nDestinationState = DESTINATION_SHAPEGROUP;
+                m_aStates.top().bInShapeGroup = true;
+            }
             break;
         default:
             SAL_INFO("writerfilter", "TODO handle destination '" << lcl_RtfToString(nKeyword) << "'");

writerfilter/source/rtftok/rtflookahead.cxx

@@ -0,0 +1,130 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <boost/shared_ptr.hpp>
+
+#include <com/sun/star/task/XStatusIndicator.hpp>
+#include <tools/stream.hxx>
+
+#include <rtflookahead.hxx>
+
+using namespace com::sun::star;
+
+namespace writerfilter {
+namespace rtftok {
+
+RTFLookahead::RTFLookahead(SvStream& rStream, sal_Size nGroupStart)
+    : m_rStream(rStream),
+    m_bHasTable(false)
+{
+    sal_Size nPos = m_rStream.Tell();
+    m_rStream.Seek(nGroupStart);
+    uno::Reference<task::XStatusIndicator> xStatusIndicator;
+    m_pTokenizer.reset(new RTFTokenizer(*this, &m_rStream, xStatusIndicator));
+    m_pTokenizer->resolveParse();
+    m_rStream.Seek(nPos);
+}
+
+RTFLookahead::~RTFLookahead()
+{
+}
+
+int RTFLookahead::dispatchDestination(RTFKeyword /*nKeyword*/)
+{
+    return 0;
+}
+
+int RTFLookahead::dispatchFlag(RTFKeyword nKeyword)
+{
+    if (nKeyword == RTF_INTBL)
+        m_bHasTable = true;
+    return 0;
+}
+
+int RTFLookahead::dispatchSymbol(RTFKeyword /*nKeyword*/)
+{
+    return 0;
+}
+
+int RTFLookahead::dispatchToggle(RTFKeyword /*nKeyword*/, bool /*bParam*/, int /*nParam*/)
+{
+    return 0;
+}
+
+int RTFLookahead::dispatchValue(RTFKeyword /*nKeyword*/, int /*nParam*/)
+{
+    return 0;
+}
+
+int RTFLookahead::resolveChars(char ch)
+{
+    while(!m_rStream.IsEof() && (ch != '{' && ch != '}' && ch != '\\'))
+        m_rStream >> ch;
+    if (!m_rStream.IsEof())
+        m_rStream.SeekRel(-1);
+    return 0;
+}
+
+int RTFLookahead::pushState()
+{
+    m_pTokenizer->pushGroup();
+    return 0;
+}
+
+int RTFLookahead::popState()
+{
+    m_pTokenizer->popGroup();
+    return 0;
+}
+
+RTFDestinationState RTFLookahead::getDestinationState()
+{
+    return DESTINATION_NORMAL;
+}
+
+void RTFLookahead::setDestinationState(RTFDestinationState /*nDestinationState*/)
+{
+}
+
+RTFInternalState RTFLookahead::getInternalState()
+{
+    return INTERNAL_NORMAL;
+}
+
+void RTFLookahead::setInternalState(RTFInternalState /*nInternalState*/)
+{
+}
+
+bool RTFLookahead::getSkipUnknown()
+{
+    return false;
+}
+
+void RTFLookahead::setSkipUnknown(bool /*bSkipUnknown*/)
+{
+}
+
+void RTFLookahead::finishSubstream()
+{
+}
+
+bool RTFLookahead::isSubstream() const
+{
+    return false;
+}
+
+bool RTFLookahead::hasTable()
+{
+    return m_bHasTable;
+}
+
+} // namespace rtftok
+} // namespace writerfilter
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

writerfilter/source/rtftok/rtflookahead.hxx

@@ -0,0 +1,56 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef _RTFLOOKAHEAD_HXX_
+#define _RTFLOOKAHEAD_HXX_
+
+#include <rtflistener.hxx>
+#include <rtftokenizer.hxx>
+
+class SvStream;
+
+namespace writerfilter {
+    namespace rtftok {
+        /**
+         * This acts like an importer, but used for looking ahead, e.g. to
+         * determine if the current group contains a table, etc.
+         */
+        class RTFLookahead : public RTFListener
+        {
+            public:
+                RTFLookahead(SvStream& rStream, sal_Size nGroupStart);
+                virtual ~RTFLookahead();
+                virtual int dispatchDestination(RTFKeyword nKeyword);
+                virtual int dispatchFlag(RTFKeyword nKeyword);
+                virtual int dispatchSymbol(RTFKeyword nKeyword);
+                virtual int dispatchToggle(RTFKeyword nKeyword, bool bParam, int nParam);
+                virtual int dispatchValue(RTFKeyword nKeyword, int nParam);
+                virtual int resolveChars(char ch);
+                virtual int pushState();
+                virtual int popState();
+                virtual RTFDestinationState getDestinationState();
+                virtual void setDestinationState(RTFDestinationState nDestinationState);
+                virtual RTFInternalState getInternalState();
+                virtual void setInternalState(RTFInternalState nInternalState);
+                virtual bool getSkipUnknown();
+                virtual void setSkipUnknown(bool bSkipUnknown);
+                virtual void finishSubstream();
+                virtual bool isSubstream() const;
+                bool hasTable();
+            private:
+                boost::shared_ptr<RTFTokenizer> m_pTokenizer;
+                SvStream& m_rStream;
+                bool m_bHasTable;
+        };
+    } // namespace rtftok
+} // namespace writerfilter
+
+#endif // _RTFDOCUMENTIMPL_HXX_
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */