n#820503: initial MCE support in writerfilter ooxml tokenizer

writerfilter OOXML tokenizer was just ignoring the mce elements and thus
getting the Choice content and the Fallback one. This initial support
drops all mc:Choice contents to read mc:Fallback. At least for drawingML
vs VML support, we have a much better support of the fallback.

Change-Id: Ic0bf69d0436994e9cfcf38accdd57d17e9f391fe
(cherry picked from commit f4112ce9e7840efbcd567c4d18ed4519a1e91294)
Reviewed-on: https://gerrit.libreoffice.org/4705
Reviewed-by: Fridrich Strba <fridrich@documentfoundation.org>
Tested-by: Fridrich Strba <fridrich@documentfoundation.org>

4 files changed, 67 insertions, 8 deletions

diff --git a/writerfilter/CustomTarget_source.mk b/writerfilter/CustomTarget_source.mk
index 0ffd8d95d20f..890349768c93 100644
--- a/writerfilter/CustomTarget_source.mk
+++ b/writerfilter/CustomTarget_source.mk
@@ -38,6 +38,7 @@ writerfilter_OOXMLNAMESPACES= \
 	vml-main \
 	vml-officeDrawing \
 	vml-wordprocessingDrawing \
+	mce \
 	wml
 
 writerfilter_ALL = \
diff --git a/writerfilter/source/ooxml/OOXMLFastContextHandler.cxx b/writerfilter/source/ooxml/OOXMLFastContextHandler.cxx
index aae56aaa472a..403bc324b0bd 100644
--- a/writerfilter/source/ooxml/OOXMLFastContextHandler.cxx
+++ b/writerfilter/source/ooxml/OOXMLFastContextHandler.cxx
@@ -127,7 +127,8 @@ OOXMLFastContextHandler::OOXMLFastContextHandler
   mnInstanceNumber(mnInstanceCount),
   mnRefCount(0),
   inPositionV(false),
-  m_xContext(context)
+  m_xContext(context),
+  m_bDiscardChildren(false)
 {
     mnInstanceCount++;
     aSetContexts.insert(this);
@@ -150,7 +151,8 @@ OOXMLFastContextHandler::OOXMLFastContextHandler
   mnInstanceNumber(mnInstanceCount),
   mnRefCount(0),
   inPositionV(pContext->inPositionV),
-  m_xContext(pContext->m_xContext)
+  m_xContext(pContext->m_xContext),
+  m_bDiscardChildren(pContext->m_bDiscardChildren)
 {
     if (pContext != NULL)
     {
@@ -190,8 +192,14 @@ void SAL_CALL OOXMLFastContextHandler::startFastElement
     dumpXml( debug_logger );
     debug_logger->endElement();
 #endif
-    attributes(Attribs);
-    lcl_startFastElement(Element, Attribs);
+    if ((Element & 0xffff0000) == NS_mce && (Element & 0xffff) == OOXML_Choice)
+        m_bDiscardChildren = true;
+
+    if (!m_bDiscardChildren)
+    {
+        attributes(Attribs);
+        lcl_startFastElement(Element, Attribs);
+    }
 }
 
 void SAL_CALL OOXMLFastContextHandler::startUnknownElement
@@ -218,7 +226,11 @@ throw (uno::RuntimeException, xml::sax::SAXException)
     (void) sToken;
 #endif
 
-    lcl_endFastElement(Element);
+    if ((Element & 0xffff0000) == NS_mce && (Element & 0xffff) == OOXML_Choice)
+        m_bDiscardChildren = false;
+
+    if (!m_bDiscardChildren)
+        lcl_endFastElement(Element);
 
 #ifdef DEBUG_CONTEXT_HANDLER
     debug_logger->startElement("at-end");
@@ -269,10 +281,14 @@ uno::Reference< xml::sax::XFastContextHandler > SAL_CALL
     debug_logger->startElement("contexthandler.createFastChildContext");
     debug_logger->attribute("token", fastTokenToId(Element));
     debug_logger->attribute("type", getType());
+    debug_logger->attribute("discard-children", OUString::valueOf(m_bDiscardChildren));
 #endif
 
-    uno::Reference< xml::sax::XFastContextHandler > xResult
-        (lcl_createFastChildContext(Element, Attribs));
+    uno::Reference< xml::sax::XFastContextHandler > xResult;
+    if ((Element & 0xffff0000) != NS_mce && !m_bDiscardChildren)
+        xResult.set(lcl_createFastChildContext(Element, Attribs));
+    else if ((Element & 0xffff0000) == NS_mce)
+        xResult = this;
 
 #ifdef DEBUG_CONTEXT_HANDLER
     debug_logger->endElement();
@@ -322,7 +338,8 @@ void OOXMLFastContextHandler::lcl_characters
 (const OUString & rString)
 throw (uno::RuntimeException, xml::sax::SAXException)
 {
-    OOXMLFactory::getInstance()->characters(this, rString);
+    if (!m_bDiscardChildren)
+        OOXMLFactory::getInstance()->characters(this, rString);
 }
 
 namespace
diff --git a/writerfilter/source/ooxml/OOXMLFastContextHandler.hxx b/writerfilter/source/ooxml/OOXMLFastContextHandler.hxx
index b47f611046a8..39bbcacf253b 100644
--- a/writerfilter/source/ooxml/OOXMLFastContextHandler.hxx
+++ b/writerfilter/source/ooxml/OOXMLFastContextHandler.hxx
@@ -289,6 +289,7 @@ private:
     void operator =(OOXMLFastContextHandler &); // not defined
 
     uno::Reference< uno::XComponentContext > m_xContext;
+    bool m_bDiscardChildren;
 
     static sal_uInt32 mnInstanceCount;
 
diff --git a/writerfilter/source/ooxml/model.xml b/writerfilter/source/ooxml/model.xml
index 18861880e801..e4af31990e6c 100644
--- a/writerfilter/source/ooxml/model.xml
+++ b/writerfilter/source/ooxml/model.xml
@@ -30,6 +30,7 @@
   <namespace-alias name="http://schemas.openxmlformats.org/wordprocessingml/2006/main" alias="wordprocessingml" id="doc"/>
   <namespace-alias name="http://schemas.openxmlformats.org/officeDocument/2006/math" alias="math" id="officeMath"/>
   <namespace-alias name="http://schemas.openxmlformats.org/schemaLibrary/2006/main" alias="schemaLibrary" id="schema"/>
+  <namespace-alias name="http://schemas.openxmlformats.org/markup-compatibility/2006" alias="mce" id="mce"/>
   <namespace-alias name="http://sprm" alias="sprm" id="sprm"/>
   <token tokenid="ooxml:shape"/>
   <token tokenid="ooxml:token"/>
@@ -12136,6 +12137,45 @@
       <value name="background" tokenid="ooxml:Value_office_ST_FillType_background">background</value>
     </resource>
   </namespace>
+  <namespace name="mce">
+    <start name="AlternateContent"/>
+    <grammar xmlns="http://relaxng.org/ns/structure/1.0" ns="http://schemas.openxmlformats.org/markup-compatibility/2006" datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
+      <define name="nsList">
+        <list>
+          <zeroOrMore>
+            <data type="NCName"/>
+          </zeroOrMore>
+        </list>
+      </define>
+      <define name="AlternateContent">
+        <element name="AlternateContent">
+          <oneOrMore>
+            <ref name="choice"/>
+          </oneOrMore>
+          <optional>
+            <ref name="fallback"/>
+          </optional>
+        </element>
+      </define>
+      <define name="Choice">
+        <element name="Choice">
+          <attribute name="Requires">
+            <ref name="nsList"/>
+          </attribute>
+          <text/>
+        </element>
+      </define>
+      <define name="Fallback">
+        <element name="Fallback">
+          <text/>
+        </element>
+      </define>
+    </grammar>
+    <resource name="AlternateContent" resource="Value"/>
+    <resource name="Choice" resource="Value">
+      <attribute name="Requires" tokenid="ooxml:mc_Requires"/>
+    </resource>
+  </namespace>
   <namespace name="vml-wordprocessingDrawing" file="vml-wordprocessingDrawing.rng">
     <start name="bordertop"/>
     <start name="borderleft"/>