Fixed FLA export - XML formatting with blank lines on Java9+

libsrc/ffdec_lib/src/com/jpexs/helpers/XmlPrettyFormat.java

@@ -0,0 +1,82 @@
+/*
+ *  Copyright (C) 2010-2022 JPEXS, All rights reserved.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3.0 of the License, or (at your option) any later version.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library.
+ */
+package com.jpexs.helpers;
+
+import java.io.File;
+import java.io.StringReader;
+import java.io.StringWriter;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import javax.xml.transform.OutputKeys;
+import javax.xml.transform.Result;
+import javax.xml.transform.Source;
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerException;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.TransformerFactoryConfigurationError;
+import javax.xml.transform.stream.StreamResult;
+import javax.xml.transform.stream.StreamSource;
+
+/**
+ *
+ * @author JPEXS
+ */
+public class XmlPrettyFormat {
+
+    private static final String PRETTY_PRINT_XSLT = "<xsl:stylesheet version=\"1.0\" xmlns:xsl=\"http://www.w3.org/1999/XSL/Transform\">\n"
+            + "    <xsl:strip-space elements=\"*\"/>\n"
+            + "    <xsl:output method=\"xml\" encoding=\"UTF-8\"/>\n"
+            + "\n"
+            + "    <xsl:template match=\"@*|node()\">\n"
+            + "        <xsl:copy>\n"
+            + "            <xsl:apply-templates select=\"@*|node()\"/>\n"
+            + "        </xsl:copy>\n"
+            + "    </xsl:template>\n"
+            + "\n"
+            + "</xsl:stylesheet>";
+
+    public boolean prettyFormat(Source source, Result result, int indent, boolean withXmlDeclaration) {
+        try {            
+            TransformerFactory transformerFactory = TransformerFactory.newInstance();
+            transformerFactory.setAttribute("indent-number", indent);
+            Transformer transformer = transformerFactory.newTransformer(new StreamSource(new StringReader(PRETTY_PRINT_XSLT)));
+            transformer.setOutputProperty(OutputKeys.INDENT, "yes");
+            if (!withXmlDeclaration) {
+                transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
+            }
+            transformer.transform(source, result);
+            return true;
+        } catch (TransformerFactoryConfigurationError | IllegalArgumentException | TransformerException e) {
+            Logger.getLogger(XmlPrettyFormat.class.getName()).log(Level.SEVERE, "Pretty print error", e);
+            return false;
+        }
+    }
+    
+    public boolean prettyFormat(File source, File result, int indent, boolean withXmlDeclaration) {
+        return prettyFormat(new StreamSource(source), new StreamResult(result), indent, withXmlDeclaration);
+    }
+    
+    public String prettyFormat(String input, int indent, boolean withXmlDeclaration) {
+        Source xmlInput = new StreamSource(new StringReader(input));
+        StringWriter stringWriter = new StringWriter();
+        StreamResult xmlOutput = new StreamResult(stringWriter);
+        if (!prettyFormat(xmlInput, xmlOutput, indent, withXmlDeclaration)) {
+            return input;
+        }
+        return xmlOutput.getWriter().toString();
+    }
+}