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pdfHTML is an iText 7 add-on that lets you to parse (X)HTML snippets and the associated CSS and converts
them to PDF.
/*
This file is part of the iText (R) project.
Copyright (c) 1998-2017 iText Group NV
Authors: Bruno Lowagie, Paulo Soares, et al.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License version 3
as published by the Free Software Foundation with the addition of the
following permission added to Section 15 as permitted in Section 7(a):
FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
OF THIRD PARTY RIGHTS
This program 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program; if not, see http://www.gnu.org/licenses or write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA, 02110-1301 USA, or download the license from the following URL:
http://itextpdf.com/terms-of-use/
The interactive user interfaces in modified source and object code versions
of this program must display Appropriate Legal Notices, as required under
Section 5 of the GNU Affero General Public License.
In accordance with Section 7(b) of the GNU Affero General Public License,
a covered work must retain the producer line in every PDF that is created
or manipulated using iText.
You can be released from the requirements of the license by purchasing
a commercial license. Buying such a license is mandatory as soon as you
develop commercial activities involving the iText software without
disclosing the source code of your own applications.
These activities include: offering paid services to customers as an ASP,
serving PDFs on the fly in a web application, shipping iText with a closed
source product.
For more information, please contact iText Software Corp. at this
address: [email protected]
*/
package com.itextpdf.html2pdf.attach.impl.tags;
import com.itextpdf.html2pdf.attach.ITagWorker;
import com.itextpdf.html2pdf.attach.ProcessorContext;
import com.itextpdf.html2pdf.attach.impl.layout.HtmlDocumentRenderer;
import com.itextpdf.html2pdf.attach.impl.layout.form.element.IFormField;
import com.itextpdf.html2pdf.attach.util.WaitingInlineElementsHelper;
import com.itextpdf.html2pdf.css.CssConstants;
import com.itextpdf.html2pdf.css.resolve.ICssResolver;
import com.itextpdf.html2pdf.html.node.IElementNode;
import com.itextpdf.html2pdf.html.node.INode;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.IPropertyContainer;
import com.itextpdf.layout.element.AreaBreak;
import com.itextpdf.layout.element.IBlockElement;
import com.itextpdf.layout.element.ILeafElement;
import com.itextpdf.layout.element.Image;
import com.itextpdf.layout.property.Property;
/**
* TagWorker class for the {@code html} element.
*/
public class HtmlTagWorker implements ITagWorker {
/** The iText document instance. */
private Document document;
/** Helper class for waiting inline elements. */
private WaitingInlineElementsHelper inlineHelper;
/**
* Creates a new {@link HtmlTagWorker} instance.
*
* @param element the element
* @param context the context
*/
public HtmlTagWorker(IElementNode element, ProcessorContext context) {
boolean immediateFlush = context.isImmediateFlush() && !context.getCssContext().isPagesCounterPresent();
PdfDocument pdfDocument = context.getPdfDocument();
document = new Document(pdfDocument, pdfDocument.getDefaultPageSize(), immediateFlush);
document.setRenderer(new HtmlDocumentRenderer(document, immediateFlush));
document.setProperty(Property.COLLAPSING_MARGINS, true);
document.setFontProvider(context.getFontProvider());
if (context.getTempFonts() != null) {
document.setProperty(Property.FONT_SET, context.getTempFonts());
}
String fontFamily = element.getStyles().get(CssConstants.FONT_FAMILY);
document.setProperty(Property.FONT, fontFamily);
inlineHelper = new WaitingInlineElementsHelper(element.getStyles().get(CssConstants.WHITE_SPACE), element.getStyles().get(CssConstants.TEXT_TRANSFORM));
}
/* (non-Javadoc)
* @see com.itextpdf.html2pdf.attach.ITagWorker#processEnd(com.itextpdf.html2pdf.html.node.IElementNode, com.itextpdf.html2pdf.attach.ProcessorContext)
*/
@Override
public void processEnd(IElementNode element, ProcessorContext context) {
inlineHelper.flushHangingLeaves(document);
}
/* (non-Javadoc)
* @see com.itextpdf.html2pdf.attach.ITagWorker#processContent(java.lang.String, com.itextpdf.html2pdf.attach.ProcessorContext)
*/
@Override
public boolean processContent(String content, ProcessorContext context) {
inlineHelper.add(content);
return true;
}
/* (non-Javadoc)
* @see com.itextpdf.html2pdf.attach.ITagWorker#processTagChild(com.itextpdf.html2pdf.attach.ITagWorker, com.itextpdf.html2pdf.attach.ProcessorContext)
*/
@Override
public boolean processTagChild(ITagWorker childTagWorker, ProcessorContext context) {
boolean processed = false;
if (childTagWorker instanceof SpanTagWorker) {
boolean allChildrenProcessed = true;
for (IPropertyContainer propertyContainer : ((SpanTagWorker) childTagWorker).getAllElements()) {
if (propertyContainer instanceof ILeafElement) {
inlineHelper.add((ILeafElement) propertyContainer);
} else if (propertyContainer instanceof IBlockElement && CssConstants.INLINE_BLOCK.equals(((SpanTagWorker) childTagWorker).getElementDisplay(propertyContainer))) {
inlineHelper.add((IBlockElement) propertyContainer);
} else {
allChildrenProcessed = processBlockChild(propertyContainer) && allChildrenProcessed;
}
}
processed = allChildrenProcessed;
} else if (childTagWorker.getElementResult() instanceof IFormField) {
if (childTagWorker instanceof IDisplayAware && CssConstants.BLOCK.equals(((IDisplayAware) childTagWorker).getDisplay())) {
postProcessInlineGroup();
inlineHelper.add((ILeafElement) childTagWorker.getElementResult());
postProcessInlineGroup();
} else {
inlineHelper.add((IFormField) childTagWorker.getElementResult());
}
processed = true;
} else if (childTagWorker.getElementResult() instanceof AreaBreak) {
postProcessInlineGroup();
document.add((AreaBreak) childTagWorker.getElementResult());
processed = true;
} else if (childTagWorker instanceof IDisplayAware && CssConstants.INLINE_BLOCK.equals(((IDisplayAware) childTagWorker).getDisplay()) && childTagWorker.getElementResult() instanceof IBlockElement) {
inlineHelper.add((IBlockElement) childTagWorker.getElementResult());
processed = true;
} else if (childTagWorker instanceof BrTagWorker) {
inlineHelper.add((ILeafElement) childTagWorker.getElementResult());
processed = true;
} else if (childTagWorker.getElementResult() != null) {
processed = processBlockChild(childTagWorker.getElementResult());
}
return processed;
}
/* (non-Javadoc)
* @see com.itextpdf.html2pdf.attach.ITagWorker#getElementResult()
*/
@Override
public IPropertyContainer getElementResult() {
return document;
}
/**
* Processes the page rules.
*
* @param rootNode the root node
* @param cssResolver the css resolver
* @param context the context
*/
public void processPageRules(INode rootNode, ICssResolver cssResolver, ProcessorContext context) {
((HtmlDocumentRenderer)document.getRenderer()).processPageRules(rootNode, cssResolver, context);
}
/**
* Processes a block child.
*
* @param element the element
* @return true, if successful
*/
private boolean processBlockChild(IPropertyContainer element) {
postProcessInlineGroup();
if (element instanceof IBlockElement) {
document.add((IBlockElement) element);
return true;
}
if (element instanceof Image) {
document.add((Image) element);
return true;
}
return false;
}
/**
* Post-processes the hanging leaves of the waiting inline elements.
*/
private void postProcessInlineGroup() {
inlineHelper.flushHangingLeaves(document);
}
}