tdf#119143: introduce tentative directional embedding import support

ECMA-376-1:2016 states that w:dir is functionally equivalent to LRE/RLE+PDF
pair around the enclosed runs. So this patch does just that.

Change-Id: Ibf9775338cc38a3bbc38a42a33fc64ae787b478f
Reviewed-on: https://gerrit.libreoffice.org/59643
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

3 files changed, 47 insertions, 0 deletions

diff --git a/writerfilter/source/ooxml/OOXMLFastContextHandler.cxx b/writerfilter/source/ooxml/OOXMLFastContextHandler.cxx
index 33db6201101c..3ebe463b6270 100644
--- a/writerfilter/source/ooxml/OOXMLFastContextHandler.cxx
+++ b/writerfilter/source/ooxml/OOXMLFastContextHandler.cxx
@@ -357,6 +357,10 @@ void OOXMLFastContextHandler::endCharacterGroup()
     }
 }
 
+void OOXMLFastContextHandler::pushBiDiEmbedLevel() {}
+
+void OOXMLFastContextHandler::popBiDiEmbedLevel() {}
+
 void OOXMLFastContextHandler::startParagraphGroup()
 {
     if (isForwardEvents())
@@ -1228,6 +1232,20 @@ void OOXMLFastContextHandlerValue::setDefaultStringValue()
         setValue(pValue);
     }
 }
+
+// ECMA-376-1:2016 17.3.2.8; https://www.unicode.org/reports/tr9/#Explicit_Directional_Embeddings
+void OOXMLFastContextHandlerValue::pushBiDiEmbedLevel()
+{
+    const bool bRtl
+        = mpValue.get() && mpValue.get()->getInt() == NS_ooxml::LN_Value_ST_Direction_rtl;
+    OOXMLFactory::characters(this, bRtl ? u"\u202B" : u"\u202A"); // RLE / LRE
+}
+
+void OOXMLFastContextHandlerValue::popBiDiEmbedLevel()
+{
+    OOXMLFactory::characters(this, u"\u202C"); // PDF (POP DIRECTIONAL FORMATTING)
+}
+
 /*
   class OOXMLFastContextHandlerTable
 */
diff --git a/writerfilter/source/ooxml/OOXMLFastContextHandler.hxx b/writerfilter/source/ooxml/OOXMLFastContextHandler.hxx
index 0bf03601e5b5..68e5d8e8c36f 100644
--- a/writerfilter/source/ooxml/OOXMLFastContextHandler.hxx
+++ b/writerfilter/source/ooxml/OOXMLFastContextHandler.hxx
@@ -139,6 +139,8 @@ public:
     void endParagraphGroup();
     void startCharacterGroup();
     void endCharacterGroup();
+    virtual void pushBiDiEmbedLevel();
+    virtual void popBiDiEmbedLevel();
     void startSdt();
     void endSdt();
 
@@ -335,6 +337,9 @@ public:
     virtual void setDefaultHexValue() override;
     virtual void setDefaultStringValue() override;
 
+    virtual void pushBiDiEmbedLevel() override;
+    virtual void popBiDiEmbedLevel() override;
+
 private:
     OOXMLValue::Pointer_t mpValue;
 };
diff --git a/writerfilter/source/ooxml/model.xml b/writerfilter/source/ooxml/model.xml
index 25f8a267bb8a..36328c035d75 100644
--- a/writerfilter/source/ooxml/model.xml
+++ b/writerfilter/source/ooxml/model.xml
@@ -13943,12 +13943,27 @@
           <element name="sdt">
             <ref name="CT_SdtRun"/>
           </element>
+          <element name="dir">
+            <ref name="CT_DirContentRun"/>
+          </element>
           <element name="r">
             <ref name="CT_R"/>
           </element>
           <ref name="EG_RunLevelElts"/>
         </choice>
       </define>
+      <define name="CT_DirContentRun">
+        <ref name="EG_PContent"/>
+        <attribute name="val">
+          <ref name="ST_Direction"/>
+        </attribute>
+      </define>
+      <define name="ST_Direction">
+        <choice>
+          <value>ltr</value>
+          <value>rtl</value>
+        </choice>
+      </define>
       <define name="CT_SdtContentRun">
         <ref name="EG_PContent"/>
       </define>
@@ -18144,6 +18159,15 @@
     <resource name="CT_SdtEndPr" resource="Properties">
       <element name="rPr" tokenid="ooxml:CT_SdtEndPr_rPr"/>
     </resource>
+    <resource name="CT_DirContentRun" resource="Value">
+      <attribute name="val" tokenid="ooxml:CT_DirContentRun_val" action="setValue"/>
+      <action name="start" action="pushBiDiEmbedLevel"/>
+      <action name="end" action="popBiDiEmbedLevel"/>
+    </resource>
+    <resource name="ST_Direction" resource="List">
+      <value tokenid="ooxml:Value_ST_Direction_ltr">ltr</value>
+      <value tokenid="ooxml:Value_ST_Direction_rtl">rtl</value>
+    </resource>
     <resource name="CT_SdtContentRun" resource="Stream"/>
     <resource name="CT_SdtContentBlock" resource="Stream"/>
     <resource name="CT_SdtContentRow" resource="Stream"/>