tdf#84237 use XErrorHandler in CDocumentBuilder

In documentbuilder.cxx added code to call XErrorHandler::warning and XErrorHandler::error functions (from DOM::warning_func and DOM::error_func)
In domtest.cxx added try {} catch () block to BasicTest::validInputTest, BasicTest::warningInputTest and BasicTest::errorInputTest and to SerializerTest::serializerTest. Also uncommented lines CPPUNIT_TEST(warningInputTest); and CPPUNIT_TEST(errorInputTest);

Unit tests are now working
(FatalError test removed, as lib2xml doesn't distinguish between error and fatal error and counts everything as error).

Change-Id: I27c5036df6a1cc5bef5dbb8171c201d81bae2ccd
Reviewed-on: https://gerrit.libreoffice.org/41376Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>

unoxml/source/dom/documentbuilder.cxx

@@ -269,21 +269,71 @@ namespace DOM
     // default warning handler does not trigger assertion
     static void warning_func(void * ctx, const char * /*msg*/, ...)
     {
-        SAL_INFO(
-            "unoxml",
-            "libxml2 warning: "
-                << make_error_message(static_cast<xmlParserCtxtPtr>(ctx)));
+        try
+        {
+            xmlParserCtxtPtr const pctx = static_cast<xmlParserCtxtPtr>(ctx);
+
+            SAL_INFO(
+                "unoxml",
+                "libxml2 warning: "
+                << make_error_message(pctx));
+
+            CDocumentBuilder * const pDocBuilder = static_cast<CDocumentBuilder*>(pctx->_private);
+
+            if (pDocBuilder->getErrorHandler().is())   // if custom error handler is set (using setErrorHandler ())
+            {
+                // Prepare SAXParseException to be passed to custom XErrorHandler::warning function
+                css::xml::sax::SAXParseException saxex;
+                saxex.Message = make_error_message(pctx);
+                saxex.LineNumber = static_cast<sal_Int32>(pctx->lastError.line);
+                saxex.ColumnNumber = static_cast<sal_Int32>(pctx->lastError.int2);
+
+                // Call custom warning function
+                pDocBuilder->getErrorHandler()->warning(::css::uno::Any(saxex));
+            }
+        }
+        catch (const css::uno::RuntimeException &e)
+        {
+            // Protect lib2xml from UNO Exception
+            SAL_WARN("unoxml",
+                "DOM::warning_func: caught RuntimeException"
+                << e.Message);
+        }
     }
 
     // default error handler triggers assertion
     static void error_func(void * ctx, const char * /*msg*/, ...)
     {
-        SAL_WARN(
-            "unoxml",
-            "libxml2 error: "
-                << make_error_message(static_cast<xmlParserCtxtPtr>(ctx)));
+        try
+        {
+            xmlParserCtxtPtr const pctx = static_cast<xmlParserCtxtPtr>(ctx);
+            SAL_WARN(
+                "unoxml",
+                "libxml2 error: "
+                << make_error_message(pctx));
+
+            CDocumentBuilder * const pDocBuilder = static_cast<CDocumentBuilder*>(pctx->_private);
+
+            if (pDocBuilder->getErrorHandler().is())   // if custom error handler is set (using setErrorHandler ())
+            {
+                // Prepare SAXParseException to be passed to custom XErrorHandler::error function
+                css::xml::sax::SAXParseException saxex;
+                saxex.Message = make_error_message(pctx);
+                saxex.LineNumber = static_cast<sal_Int32>(pctx->lastError.line);
+                saxex.ColumnNumber = static_cast<sal_Int32>(pctx->lastError.int2);
+
+                // Call custom warning function
+                pDocBuilder->getErrorHandler()->error(::css::uno::Any(saxex));
+            }
+        }
+        catch (const css::uno::RuntimeException &e)
+        {
+            // Protect lib2xml from UNO Exception
+            SAL_WARN("unoxml",
+                "DOM::error_func: caught RuntimeException"
+                << e.Message);
+        }
     }
-
     } // extern "C"
 
     void throwEx(xmlParserCtxtPtr ctxt)

unoxml/source/dom/documentbuilder.hxx

@@ -123,6 +123,17 @@ namespace DOM
         the XML document to be parsed.
         */
         virtual void SAL_CALL setErrorHandler(const css::uno::Reference< css::xml::sax::XErrorHandler >& eh) override;
+
+        /*
+        Get the ErrorHandler to be used to report errors present in
+        the XML document to be parsed.
+        */
+
+        const css::uno::Reference< css::xml::sax::XErrorHandler >& getErrorHandler()
+        {
+            return m_xErrorHandler;
+        }
+
     };
 }