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svg is a module for iText7 that allows you to integrate SVG images in your PDF creation and manipulation process
/*
This file is part of the iText (R) project.
Copyright (c) 1998-2018 iText Group NV
Authors: iText Software.
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.svg.css.impl;
import com.itextpdf.styledxmlparser.AttributeConstants;
import com.itextpdf.styledxmlparser.css.CssDeclaration;
import com.itextpdf.styledxmlparser.css.CssStyleSheet;
import com.itextpdf.styledxmlparser.css.ICssContext;
import com.itextpdf.styledxmlparser.css.ICssResolver;
import com.itextpdf.styledxmlparser.css.media.MediaDeviceDescription;
import com.itextpdf.styledxmlparser.css.parse.CssRuleSetParser;
import com.itextpdf.styledxmlparser.css.parse.CssStyleSheetParser;
import com.itextpdf.styledxmlparser.node.IAttribute;
import com.itextpdf.styledxmlparser.node.IDataNode;
import com.itextpdf.styledxmlparser.node.IElementNode;
import com.itextpdf.styledxmlparser.node.INode;
import com.itextpdf.styledxmlparser.node.ITextNode;
import com.itextpdf.svg.SvgTagConstants;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
/**
* Default CSS resolver implementation.
*/
public class DefaultSvgStyleResolver implements ICssResolver {
private CssStyleSheet internalStyleSheet;
/**
* Creates a DefaultSvgStyleResolver. This constructor will instantiate its internal style sheet and it
* will collect the css declarations from the provided node.
*
* @param rootNode node to collect css from
*/
public DefaultSvgStyleResolver(INode rootNode) {
internalStyleSheet = new CssStyleSheet();
collectCssDeclarations(rootNode);
}
@Override
public Map resolveStyles(INode node, ICssContext context) {
Map styles = new HashMap<>();
//Load in defaults
//TODO (RND-865): Figure out if defaults are necessary
//Load in from collected style sheets
List styleSheetDeclarations = internalStyleSheet.getCssDeclarations(node, MediaDeviceDescription.createDefault());
for (CssDeclaration ssd : styleSheetDeclarations) {
styles.put(ssd.getProperty(), ssd.getExpression());
}
//Load in inherited declarations from parent
//TODO: RND-880
//Load in attributes declarations
if (node instanceof IElementNode) {
IElementNode eNode = (IElementNode) node;
for (IAttribute attr : eNode.getAttributes()) {
processAttribute(attr, styles);
}
}
return styles;
}
private void processAttribute(IAttribute attr, Map styles) {
//Style attribute needs to be parsed further
if (attr.getKey().equals(AttributeConstants.STYLE)) {
Map parsed = parseStylesFromStyleAttribute(attr.getValue());
for (Map.Entry style : parsed.entrySet()) {
styles.put(style.getKey(), style.getValue());
}
} else {
styles.put(attr.getKey(), attr.getValue());
}
}
private Map parseStylesFromStyleAttribute(String style) {
Map parsed = new HashMap<>();
List declarations = CssRuleSetParser.parsePropertyDeclarations(style);
for (CssDeclaration declaration : declarations) {
parsed.put(declaration.getProperty(), declaration.getExpression());
}
return parsed;
}
private void collectCssDeclarations(INode rootNode) {
internalStyleSheet = new CssStyleSheet();
LinkedList q = new LinkedList<>();
if (rootNode != null) {
q.add(rootNode);
}
while (! q.isEmpty()) {
INode currentNode = q.getFirst();
q.removeFirst();
if (currentNode instanceof IElementNode) {
IElementNode headChildElement = (IElementNode) currentNode;
if (headChildElement.name().equals(SvgTagConstants.STYLE)) {//XML parser will parse style tag contents as text nodes
if (currentNode.childNodes().size() > 0 && ( currentNode.childNodes().get(0) instanceof IDataNode || currentNode.childNodes().get(0) instanceof ITextNode )) {
String styleData;
if (currentNode.childNodes().get(0) instanceof IDataNode) {
styleData = ( (IDataNode) currentNode.childNodes().get(0) ).getWholeData();
} else {
styleData = ( (ITextNode) currentNode.childNodes().get(0) ).wholeText();
}
CssStyleSheet styleSheet = CssStyleSheetParser.parse(styleData);
//TODO(RND-863): mediaquery wrap
//styleSheet = wrapStyleSheetInMediaQueryIfNecessary(headChildElement, styleSheet);
internalStyleSheet.appendCssStyleSheet(styleSheet);
}
}
//TODO(RND-864): resolution of external style sheets via the link tag
}
for (INode child : currentNode.childNodes()) {
if (child instanceof IElementNode) {
q.add(child);
}
}
}
}
}