Add check for convertToElements

DEVSIX-7929

Author: guustysebie

src/main/java/com/itextpdf/html2pdf/attach/ProcessorContext.java

@@ -22,6 +22,7 @@ This file is part of the iText (R) project.
  */
 package com.itextpdf.html2pdf.attach;
 
+import com.itextpdf.commons.actions.contexts.IMetaInfo;
 import com.itextpdf.html2pdf.ConverterProperties;
 import com.itextpdf.html2pdf.attach.impl.DefaultTagWorkerFactory;
 import com.itextpdf.html2pdf.attach.impl.HtmlMetaInfoContainer;
@@ -35,7 +36,6 @@ This file is part of the iText (R) project.
 import com.itextpdf.html2pdf.resolver.form.RadioCheckResolver;
 import com.itextpdf.html2pdf.resolver.resource.HtmlResourceResolver;
 import com.itextpdf.io.font.FontProgram;
-import com.itextpdf.commons.actions.contexts.IMetaInfo;
 import com.itextpdf.kernel.pdf.PdfDocument;
 import com.itextpdf.layout.font.FontInfo;
 import com.itextpdf.layout.font.FontProvider;
@@ -231,9 +231,9 @@ public State getState() {
     }
 
     /**
-     * Gets the PDF document.
+     * Gets the PDF document. If the PDF document is not set, null is returned.
      *
-     * @return the PDF document
+     * @return the PDF document or null
      */
     public PdfDocument getPdfDocument() {
         return pdfDocument;

src/main/java/com/itextpdf/html2pdf/attach/impl/tags/ButtonTagWorker.java

@@ -60,7 +60,7 @@ public class ButtonTagWorker extends DivTagWorker {
 
     private boolean hasChildren = false;
 
-    private final PdfAConformanceLevel pdfAConformanceLevel;
+    private PdfAConformanceLevel pdfAConformanceLevel;
 
     /**
      * Creates a new {@link ButtonTagWorker} instance.
@@ -76,7 +76,9 @@ public ButtonTagWorker(IElementNode element, ProcessorContext context) {
         }
         this.name = context.getFormFieldNameResolver().resolveFormName(name);
         flatten = !context.isCreateAcroForm();
-        pdfAConformanceLevel = context.getPdfDocument().getConformanceLevel();
+        if (context.getPdfDocument() != null) {
+            pdfAConformanceLevel = context.getPdfDocument().getConformanceLevel();
+        }
         lang = element.getAttribute(AttributeConstants.LANG);
     }
 

src/test/java/com/itextpdf/html2pdf/Html2ElementsTest.java

@@ -55,16 +55,16 @@ This file is part of the iText (R) project.
 import com.itextpdf.test.annotations.LogMessage;
 import com.itextpdf.test.annotations.LogMessages;
 import com.itextpdf.test.annotations.type.IntegrationTest;
-import org.junit.Assert;
-import org.junit.BeforeClass;
-import org.junit.Test;
-import org.junit.experimental.categories.Category;
 
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
+import org.junit.Assert;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
 
 @Category(IntegrationTest.class)
 public class Html2ElementsTest extends ExtendedITextTest {
@@ -381,6 +381,23 @@ public void htmlToElementsSvgObjectTest() throws IOException, InterruptedExcepti
         Assert.assertNull(new CompareTool().compareByContent(outPdf, cmpPdf, destinationFolder));
     }
 
+    @Test
+    public void htmlToElementsFormTest() throws IOException, InterruptedException {
+        FileInputStream htmlFile = new FileInputStream(sourceFolder + "formelements.html");
+        String cmpPdf = sourceFolder + "cmp_htmlToElementsForms.pdf";
+        String outPdf = destinationFolder + "htmlToElementsForms.pdf";
+
+        List<IElement> elements = HtmlConverter.convertToElements(htmlFile,
+                new ConverterProperties().setBaseUri(sourceFolder));
+        try (Document document = new Document(new PdfDocument(new PdfWriter(outPdf)))) {
+            for (IElement element : elements) {
+                document.add((IBlockElement) element);
+            }
+        }
+        Assert.assertNull(new CompareTool().compareByContent(outPdf, cmpPdf, destinationFolder));
+    }
+
+
     private static void addElementsToDocument(Document document, List<IElement> elements) {
         for (IElement elem : elements) {
             if (elem instanceof IBlockElement) {

src/test/resources/com/itextpdf/html2pdf/Html2ElementsTest/cmp_htmlToElementsForms.pdf

@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>Title</title>
+</head>
+<body>
+<form>
+
+    <input type="text" value="1">
+    <select>
+        <option value="1">1</option>
+        <option value="2">2</option>
+    </select>
+    <input name="checkbox" type="checkbox" checked>
+    <input name="radio" type="radio" checked>
+    <input name="radio" type="radio">
+    <input type="submit" value="Submit">
+    <input type="button" value="Button">
+    <button>Button</button>
+</form>
+
+</body>
+</html>