Introduce MSWordStyles::GetSwNumRule()

This is similar to GetSwFmt(), but for list styles.

Change-Id: I5c198c786e0c73c83430bd60b91d0ef85c7a49fc

sw/source/filter/ww8/wrtw8sty.cxx

@@ -718,6 +718,13 @@ void MSWordStyles::OutputStylesTable()
     m_rExport.bStyDef = false;
 }
 
+const SwNumRule* MSWordStyles::GetSwNumRule(sal_uInt16 nId) const
+{
+    std::map<sal_uInt16, const SwNumRule*>::const_iterator it = m_aNumRules.find(nId);
+    assert(it != m_aNumRules.end());
+    return it->second;
+}
+
 //---------------------------------------------------------------------------
 //          Fonts
 //---------------------------------------------------------------------------

sw/source/filter/ww8/wrtww8.hxx

@@ -1559,6 +1559,8 @@ public:
     OString GetStyleId(sal_uInt16 nId) const;
 
     const SwFmt* GetSwFmt(sal_uInt16 nId) const { return pFmtA[nId]; }
+    /// Get numbering rule of the nId-th style
+    const SwNumRule* GetSwNumRule(sal_uInt16 nId) const;
 };
 
 sal_Int16 GetWordFirstLineOffset(const SwNumFmt &rFmt);