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Parses XML to PDF, with CSS support, using iText
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/*
*
* This file is part of the iText (R) project.
Copyright (c) 1998-2022 iText Group NV
* Authors: Balder Van Camp, Emiel Ackermann, 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.tool.xml.html;
import com.itextpdf.text.Chunk;
import com.itextpdf.text.Element;
import com.itextpdf.text.ListItem;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.pdf.draw.LineSeparator;
import com.itextpdf.text.pdf.draw.VerticalPositionMark;
import com.itextpdf.tool.xml.NoCustomContextException;
import com.itextpdf.tool.xml.Tag;
import com.itextpdf.tool.xml.WorkerContext;
import com.itextpdf.tool.xml.css.CSS;
import com.itextpdf.tool.xml.css.CssUtils;
import com.itextpdf.tool.xml.exceptions.LocaleMessages;
import com.itextpdf.tool.xml.exceptions.RuntimeWorkerException;
import com.itextpdf.tool.xml.html.pdfelement.TabbedChunk;
import com.itextpdf.tool.xml.pipeline.html.HtmlPipelineContext;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* @author redlab_b
*
*/
public class ParaGraph extends AbstractTagProcessor {
/*
* (non-Javadoc)
*
* @see
* com.itextpdf.tool.xml.TagProcessor#content(com.itextpdf.tool.xml.Tag,
* java.util.List, com.itextpdf.text.Document, java.lang.String)
*/
@Override
public List content(final WorkerContext ctx, final Tag tag, final String content) {
List sanitizedChunks = HTMLUtils.sanitize(content, false);
List l = new ArrayList(1);
for (Chunk sanitized : sanitizedChunks) {
HtmlPipelineContext myctx;
try {
myctx = getHtmlPipelineContext(ctx);
} catch (NoCustomContextException e) {
throw new RuntimeWorkerException(e);
}
if ((null != tag.getCSS().get(CSS.Property.TAB_INTERVAL))) {
TabbedChunk tabbedChunk = new TabbedChunk(sanitized.getContent());
if (null != getLastChild(tag) && null != getLastChild(tag).getCSS().get(CSS.Property.XFA_TAB_COUNT)) {
tabbedChunk.setTabCount(Integer.parseInt(getLastChild(tag).getCSS().get(CSS.Property.XFA_TAB_COUNT)));
}
l.add(getCssAppliers().apply(tabbedChunk, tag, myctx));
} else if (null != getLastChild(tag) && null != getLastChild(tag).getCSS().get(CSS.Property.XFA_TAB_COUNT)) {
TabbedChunk tabbedChunk = new TabbedChunk(sanitized.getContent());
tabbedChunk.setTabCount(Integer.parseInt(getLastChild(tag).getCSS().get(CSS.Property.XFA_TAB_COUNT)));
l.add(getCssAppliers().apply(tabbedChunk, tag, myctx));
} else {
l.add(getCssAppliers().apply(sanitized, tag, myctx));
}
}
return l;
}
private Tag getLastChild(final Tag tag) {
if (0 != tag.getChildren().size())
return tag.getChildren().get(tag.getChildren().size() - 1);
else
return null;
}
/*
* (non-Javadoc)
*
* @see
* com.itextpdf.tool.xml.TagProcessor#endElement(com.itextpdf.tool.xml.Tag,
* java.util.List, com.itextpdf.text.Document)
*/
@Override
public List end(final WorkerContext ctx, final Tag tag, final List currentContent) {
List l = new ArrayList(1);
if (currentContent.size() > 0) {
List elements = new ArrayList();
List listItems = new ArrayList();
for (Element el : currentContent) {
if (el instanceof ListItem) {
if (!elements.isEmpty()) {
processParagraphItems(ctx, tag, elements, l);
elements.clear();
}
listItems.add((ListItem)el);
} else {
if (!listItems.isEmpty()) {
processListItems(ctx, tag, listItems, l);
listItems.clear();
}
elements.add(el);
}
}
if (!elements.isEmpty()) {
processParagraphItems(ctx, tag, elements, l);
elements.clear();
} else if (!listItems.isEmpty()) {
processListItems(ctx, tag, listItems, l);
listItems.clear();
}
}
return l;
}
protected void processParagraphItems(final WorkerContext ctx, final Tag tag, final List paragraphItems, List l) {
Paragraph p = new Paragraph();
p.setMultipliedLeading(1.2f);
// Element lastElement = paragraphItems.get(paragraphItems.size() - 1);
// if (lastElement instanceof Chunk && Chunk.NEWLINE.getContent().equals(((Chunk) lastElement).getContent())) {
// paragraphItems.remove(paragraphItems.size() - 1);
// }
Map css = tag.getCSS();
if (null != css.get(CSS.Property.TAB_INTERVAL)) {
addTabIntervalContent(ctx, tag, paragraphItems, p, css.get(CSS.Property.TAB_INTERVAL));
l.add(p);
} else if (null != css.get(CSS.Property.TAB_STOPS)) { // paraList = currentContentToParagraph(paragraphItems, true, true, tag, ctx);
if (!l.isEmpty() && !paraList.isEmpty()) {
Element firstElement = paraList.get(0);
if (firstElement instanceof Paragraph ) {
((Paragraph) firstElement).setSpacingBefore(0);
}
}
for (Element e : paraList) {
l.add(e);
}
}
}
protected void processListItems(final WorkerContext ctx, final Tag tag, final List listItems, List l) {
try {
com.itextpdf.text.List list = new com.itextpdf.text.List();
list.setAlignindent(false);
list = (com.itextpdf.text.List) getCssAppliers().apply(list, tag,
getHtmlPipelineContext(ctx));
list.setIndentationLeft(0);
int i = 0;
for (ListItem li : listItems) {
li = (ListItem) getCssAppliers().apply(li, tag, getHtmlPipelineContext(ctx));
if (i != listItems.size() - 1) {
li.setSpacingAfter(0);
}
if (i != 0 ) {
li.setSpacingBefore(0);
}
i++;
li.setMultipliedLeading(1.2f);
list.add(li);
}
if (!l.isEmpty()) {
Element latestElement = l.get(l.size() - 1);
if (latestElement instanceof Paragraph ) {
((Paragraph) latestElement).setSpacingAfter(0);
}
}
l.add(list);
} catch (NoCustomContextException e) {
throw new RuntimeWorkerException(LocaleMessages.getInstance().getMessage(LocaleMessages.NO_CUSTOM_CONTEXT), e);
}
}
/**
* Applies the tab interval of the p tag on its {@link TabbedChunk} elements.
* The style "xfa-tab-count" of the {@link TabbedChunk} is multiplied with the tab interval of the p tag. This width is then added to a new {@link TabbedChunk}.
* Elements other than TabbedChunks are added directly to the given Paragraph p.
*
* @param currentContent containing the elements inside the p tag.
* @param p paragraph to which the tabbed chunks will be added.
* @param value the value of style "tab-interval".
*/
private void addTabIntervalContent(final WorkerContext ctx, final Tag tag, final List currentContent, final Paragraph p, final String value) {
float width = 0;
for(Element e: currentContent) {
if (e instanceof TabbedChunk) {
width += ((TabbedChunk) e).getTabCount()*CssUtils.getInstance().parsePxInCmMmPcToPt(value);
TabbedChunk tab = new TabbedChunk(new VerticalPositionMark(), width, false);
p.add(new Chunk(tab));
p.add(new Chunk((TabbedChunk) e));
} else {
if (e instanceof LineSeparator) {
try {
HtmlPipelineContext htmlPipelineContext = getHtmlPipelineContext(ctx);
Chunk newLine = (Chunk)getCssAppliers().apply(new Chunk(Chunk.NEWLINE), tag, htmlPipelineContext);
p.add(newLine);
} catch (NoCustomContextException e1) {
throw new RuntimeWorkerException(LocaleMessages.getInstance().getMessage(LocaleMessages.NO_CUSTOM_CONTEXT), e1);
}
}
p.add(e);
}
}
}
/**
* Applies the tab stops of the p tag on its {@link TabbedChunk} elements.
*
* @param currentContent containing the elements inside the p tag.
* @param p paragraph to which the tabbed chunks will be added.
* @param value the value of style "tab-stops".
*/
private void addTabStopsContent(final List currentContent, final Paragraph p, final String value) {
List tabs = new ArrayList();
String[] alignAndWidth = value.split(" ");
float tabWidth = 0;
for(int i = 0 , j = 1; j < alignAndWidth.length ; i+=2, j+=2) {
tabWidth += CssUtils.getInstance().parsePxInCmMmPcToPt(alignAndWidth[j]);
TabbedChunk tab = new TabbedChunk(new VerticalPositionMark(), tabWidth, true, alignAndWidth[i]);
tabs.add(tab);
}
int tabsPerRow = tabs.size();
int currentTab = 0;
for(Element e: currentContent) {
if (e instanceof TabbedChunk) {
if(currentTab == tabsPerRow) {
currentTab = 0;
}
if(((TabbedChunk) e).getTabCount() != 0 /* == 1*/) {
p.add(new Chunk(tabs.get(currentTab)));
p.add(new Chunk((TabbedChunk) e));
++currentTab;
// } else { // wat doet een tabCount van groter dan 1? sla een tab over of count * tabWidth?
// int widthMultiplier = ((TabbedChunk) e).getTabCount();
}
}
else {
p.add(e);
}
}
}
/*
* (non-Javadoc)
*
* @see com.itextpdf.tool.xml.TagProcessor#isStackOwner()
*/
@Override
public boolean isStackOwner() {
return true;
}
}