Related: tdf#65642 RTF filter: import \pgnlcltr

This as a side effect also implements support for DOCX <w:pgNumType
w:fmt="lowerLetter" .../>.

Change-Id: I47b60a0390ef081dc15b26e40393e35bf7bad130

sw/qa/extras/rtfexport/data/pgnlcltr.rtf

+{\rtf1
+\pard\plain \ltrpar\ql \li0\ri0\sa200\sl276\slmult1\widctlpar\wrapdefault\aspalpha\aspnum\faauto\adjustright\rin0\lin0\itap0 \rtlch\fcs1 \af31507\afs22\alang1025 \ltrch\fcs0
+{\field\fldedit
+{\*\fldinst
+{ PAGE   \\* MERGEFORMAT }
+}
+{\fldrslt
+{1}
+}
+}
+\sect
+\sectd\pgnrestart\pgnlcltr
+{\field\fldedit
+{\*\fldinst
+{\rtlch\fcs1 \af31507 \ltrch\fcs0 \insrsid525329  PAGE   \\* MERGEFORMAT }
+}
+{\fldrslt
+{\rtlch\fcs1 \af31507 \ltrch\fcs0 \lang1024\langfe1024\noproof\insrsid9597790 A}
+}
+}
+{\rtlch\fcs1 \af31507 \ltrch\fcs0 \insrsid13321744
+\par }
+}

sw/qa/extras/rtfexport/rtfexport.cxx

@@ -1007,6 +1007,12 @@ DECLARE_RTFEXPORT_TEST(testTdf65642, "tdf65642.rtf")
     CPPUNIT_ASSERT_EQUAL(static_cast<sal_Int32>(1), getProperty<sal_Int32>(getParagraph(2), "PageNumberOffset"));
 }
 
+DECLARE_RTFEXPORT_TEST(testPgnlcltr, "pgnlcltr.rtf")
+{
+    // The second page's numbering type: this was style::NumberingType::ARABIC.
+    CPPUNIT_ASSERT_EQUAL(style::NumberingType::CHARS_LOWER_LETTER_N, getProperty<sal_Int16>(getStyles("PageStyles")->getByName("Converted1"), "NumberingType"));
+}
+
 CPPUNIT_PLUGIN_IMPLEMENT();
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

writerfilter/source/dmapper/DomainMapper.cxx

@@ -993,6 +993,10 @@ void DomainMapper::lcl_attribute(Id nName, Value & val)
                     // A, B, ...
                     pSectionContext->SetPageNumberType(style::NumberingType::CHARS_UPPER_LETTER_N);
                 break;
+                case NS_ooxml::LN_Value_ST_NumberFormat_lowerLetter:
+                    // a, b, ...
+                    pSectionContext->SetPageNumberType(style::NumberingType::CHARS_LOWER_LETTER_N);
+                break;
                 }
             }
         break;

writerfilter/source/rtftok/rtfdocumentimpl.cxx

@@ -3280,7 +3280,6 @@ RTFError RTFDocumentImpl::dispatchFlag(RTFKeyword nKeyword)
     case RTF_PGNDEC:
     case RTF_PGNUCRM:
     case RTF_PGNLCRM:
-    case RTF_PGNLCLTR:
     case RTF_PGNBIDIA:
     case RTF_PGNBIDIB:
         // These should be mapped to NS_ooxml::LN_EG_SectPrContents_pgNumType, but dmapper has no API for that at the moment.
@@ -3604,6 +3603,12 @@ RTFError RTFDocumentImpl::dispatchFlag(RTFKeyword nKeyword)
         lcl_putNestedAttribute(m_aStates.top().aSectionSprms, NS_ooxml::LN_EG_SectPrContents_pgNumType, NS_ooxml::LN_CT_PageNumber_fmt, pIntValue);
     }
     break;
+    case RTF_PGNLCLTR:
+    {
+        auto pIntValue = std::make_shared<RTFValue>(NS_ooxml::LN_Value_ST_NumberFormat_lowerLetter);
+        lcl_putNestedAttribute(m_aStates.top().aSectionSprms, NS_ooxml::LN_EG_SectPrContents_pgNumType, NS_ooxml::LN_CT_PageNumber_fmt, pIntValue);
+    }
+    break;
     default:
     {
         SAL_INFO("writerfilter", "TODO handle flag '" << lcl_RtfToString(nKeyword) << "'");