tdf#61908 OOXML export cell range for matrix/array formula

Problem Description:
- Matrix multiplication cell formula range is not exported after roundtrip.

XML Difference:
Original : <f t="array" ref="G5:G6">MMULT(A1:C2,E1:E3)</f>

Roundtrip : <f aca="false">MMULT(A1:C2,E1:E3)</f>

Solution : Added formula cell range support for matrix multiplication.

Reviewed-on: https://gerrit.libreoffice.org/16033Reviewed-by: David Tardon <dtardon@redhat.com>
Tested-by: David Tardon <dtardon@redhat.com>
(cherry picked from commit beb8e283)

Conflicts:
	sc/qa/unit/subsequent_export-test.cxx

fix 176 unbalanced XML_f xlsx export failuires

regression from

commit beb8e283
Author: yogesh.bharate001 <yogesh.bharate@synerzip.com>
Date:   Tue Jun 2 16:39:09 2015 +0530

    tdf#61908:XLSX formula cell range is not exported for MMULT.

(cherry picked from commit 103b6194)

array formulas do not consist only of multiple rows, tdf#61908 follow-up

For example, {={1,2}*3} is a two columns one row vector, or even a
single cell could hold an array formula.

(cherry picked from commit 92df7db8)

a54ce5ce437e592378fe930b779c518de9670995
14a44ac8356fdffc98b7097f48319755f5f2f317

do not write MM_REFERENCE formulas to OOXML, tdf#61908 follow-up

The array range is covered by MM_FORMULA.
Excel even complained when loading such a document.

(cherry picked from commit f501fe4d)

Change-Id: Ic871f064a98a324bc16a4253b633c97417c3f900
10e1b19fbfb8ea849ffe3d46504fdf3389633c5f
Reviewed-on: https://gerrit.libreoffice.org/18592Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sc/qa/unit/subsequent_export-test.cxx

@@ -147,6 +147,8 @@ public:
     void testHiddenShape();
     void testMoveCellAnchoredShapes();
     void testHeaderImage();
+    void testMatrixMultiplication();
+
 
     CPPUNIT_TEST_SUITE(ScExportTest);
     CPPUNIT_TEST(test);
@@ -203,6 +205,8 @@ public:
     CPPUNIT_TEST(testHiddenShape);
     CPPUNIT_TEST(testMoveCellAnchoredShapes);
     CPPUNIT_TEST(testHeaderImage);
+    CPPUNIT_TEST(testMatrixMultiplication);
+
 
     CPPUNIT_TEST_SUITE_END();
 
@@ -2824,6 +2828,32 @@ void ScExportTest::testHeaderImage()
     CPPUNIT_ASSERT(aURL.startsWith("vnd.sun.star.GraphicObject:"));
 }
 
+void ScExportTest::testMatrixMultiplication()
+{
+    ScDocShellRef xShell = loadDoc("matrix-multiplication.", XLSX);
+    CPPUNIT_ASSERT(xShell.Is());
+
+    ScDocShellRef xDocSh = saveAndReload(&(*xShell), XLSX);
+    CPPUNIT_ASSERT(xDocSh.Is());
+
+    xmlDocPtr pDoc = XPathHelper::parseExport(&(*xDocSh), m_xSFactory, "xl/worksheets/sheet1.xml", XLSX);
+    CPPUNIT_ASSERT(pDoc);
+
+    OUString CellFormulaRange = getXPath(pDoc,
+        "/x:worksheet/x:sheetData/x:row[4]/x:c/x:f","ref");
+
+    // make sure that the CellFormulaRange is G5:G6.
+    CPPUNIT_ASSERT_EQUAL(OUString("G5:G6"), CellFormulaRange);
+
+    OUString CellFormulaType = getXPath(pDoc,
+        "/x:worksheet/x:sheetData/x:row[4]/x:c/x:f","t");
+
+    // make sure that the CellFormulaType is array.
+    CPPUNIT_ASSERT_EQUAL(OUString("array"), CellFormulaType);
+
+    xDocSh->DoClose();
+}
+
 CPPUNIT_TEST_SUITE_REGISTRATION(ScExportTest);
 
 CPPUNIT_PLUGIN_IMPLEMENT();

sc/source/filter/excel/xetable.cxx

@@ -932,23 +932,82 @@ void XclExpFormulaCell::SaveXml( XclExpXmlStream& rStrm )
             // OOXTODO: XML_cm, XML_vm, XML_ph
             FSEND );
 
-    rWorksheet->startElement( XML_f,
-            // OOXTODO: XML_t,      ST_CellFormulaType
-            XML_aca,    XclXmlUtils::ToPsz( (mxTokArr && mxTokArr->IsVolatile()) || (mxAddRec && mxAddRec->IsVolatile()) ),
-            // OOXTODO: XML_ref,    ST_Ref
-            // OOXTODO: XML_dt2D,   bool
-            // OOXTODO: XML_dtr,    bool
-            // OOXTODO: XML_del1,   bool
-            // OOXTODO: XML_del2,   bool
-            // OOXTODO: XML_r1,     ST_CellRef
-            // OOXTODO: XML_r2,     ST_CellRef
-            // OOXTODO: XML_ca,     bool
-            // OOXTODO: XML_si,     uint
-            // OOXTODO: XML_bx      bool
-            FSEND );
-    rWorksheet->writeEscaped( XclXmlUtils::ToOUString(
-        rStrm.GetRoot().GetCompileFormulaContext(), mrScFmlaCell.aPos, mrScFmlaCell.GetCode()));
-    rWorksheet->endElement( XML_f );
+    bool bWriteFormula = true;
+    bool bTagStarted = false;
+    ScAddress aScPos( static_cast< SCCOL >( GetXclPos().mnCol ),
+            static_cast< SCROW >( GetXclPos().mnRow ), rStrm.GetRoot().GetCurrScTab() );
+
+    switch (mrScFmlaCell.GetMatrixFlag())
+    {
+        case MM_NONE:
+            break;
+        case MM_REFERENCE:
+            bWriteFormula = false;
+            break;
+        case MM_FORMULA:
+        case MM_FAKE:
+            {
+                // origin of the matrix - find the used matrix range
+                SCCOL nMatWidth;
+                SCROW nMatHeight;
+                mrScFmlaCell.GetMatColsRows( nMatWidth, nMatHeight );
+                OSL_ENSURE( nMatWidth && nMatHeight, "XclExpFormulaCell::XclExpFormulaCell - empty matrix" );
+                ScRange aMatScRange( aScPos );
+                ScAddress& rMatEnd = aMatScRange.aEnd;
+                rMatEnd.IncCol( static_cast< SCsCOL >( nMatWidth - 1 ) );
+                rMatEnd.IncRow( static_cast< SCsROW >( nMatHeight - 1 ) );
+                // reduce to valid range (range keeps valid, because start position IS valid
+                rStrm.GetRoot().GetAddressConverter().ValidateRange( aMatScRange, true );
+
+                OStringBuffer sFmlaCellRange;
+                if (ValidRange(aMatScRange))
+                {
+                    // calculate the cell range.
+                    sFmlaCellRange.append( XclXmlUtils::ToOString(
+                                rStrm.GetRoot().GetStringBuf(), aMatScRange.aStart ).getStr());
+                    sFmlaCellRange.append(":");
+                    sFmlaCellRange.append( XclXmlUtils::ToOString(
+                                rStrm.GetRoot().GetStringBuf(), aMatScRange.aEnd ).getStr());
+                }
+
+                if (    aMatScRange.aStart.Col() == GetXclPos().mnCol &&
+                        aMatScRange.aStart.Row() == static_cast<SCROW>(GetXclPos().mnRow))
+                {
+                    rWorksheet->startElement( XML_f,
+                            XML_aca, XclXmlUtils::ToPsz( (mxTokArr && mxTokArr->IsVolatile()) ||
+                                (mxAddRec && mxAddRec->IsVolatile())),
+                            XML_t, mxAddRec ? "array" : NULL,
+                            XML_ref, !sFmlaCellRange.isEmpty()? sFmlaCellRange.getStr() : NULL,
+                            // OOXTODO: XML_dt2D,   bool
+                            // OOXTODO: XML_dtr,    bool
+                            // OOXTODO: XML_del1,   bool
+                            // OOXTODO: XML_del2,   bool
+                            // OOXTODO: XML_r1,     ST_CellRef
+                            // OOXTODO: XML_r2,     ST_CellRef
+                            // OOXTODO: XML_ca,     bool
+                            // OOXTODO: XML_si,     uint
+                            // OOXTODO: XML_bx      bool
+                            FSEND );
+                    bTagStarted = true;
+                }
+            }
+            break;
+    }
+
+    if (bWriteFormula)
+    {
+        if (!bTagStarted)
+        {
+            rWorksheet->startElement( XML_f,
+                    XML_aca, XclXmlUtils::ToPsz( (mxTokArr && mxTokArr->IsVolatile()) ||
+                        (mxAddRec && mxAddRec->IsVolatile()) ),
+                    FSEND );
+        }
+        rWorksheet->writeEscaped( XclXmlUtils::ToOUString(
+                    rStrm.GetRoot().GetCompileFormulaContext(), mrScFmlaCell.aPos, mrScFmlaCell.GetCode()));
+        rWorksheet->endElement( XML_f );
+    }
+
     if( strcmp( sType, "inlineStr" ) == 0 )
     {
         rWorksheet->startElement( XML_is, FSEND );