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Open HTML to PDF is a CSS 2.1 renderer written in Java. This artifact contains the core rendering and layout code.
/*
*
* XhtmlDocument.java
* Copyright (c) 2004, 2005 Torbjoern Gannholm
*
* This program 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 2.1
* of the License, or (at your option) any later version.
*
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
package com.openhtmltopdf.simple;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.w3c.dom.Attr;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.ProcessingInstruction;
import com.openhtmltopdf.css.extend.StylesheetFactory;
import com.openhtmltopdf.css.extend.TreeResolver;
import com.openhtmltopdf.css.sheet.StylesheetInfo;
import com.openhtmltopdf.extend.NamespaceHandler;
/**
* Handles a general XML document
*
* @author Torbjoern Gannholm
*/
public class NoNamespaceHandler implements NamespaceHandler {
static final String _namespace = "http://www.w3.org/XML/1998/namespace";
public String getNamespace() {
return _namespace;
}
public String getAttributeValue(org.w3c.dom.Element e, String attrName) {
return e.hasAttribute(attrName) ? e.getAttribute(attrName) : null;
}
public String getAttributeValue(Element e, String namespaceURI, String attrName) {
if (namespaceURI == TreeResolver.NO_NAMESPACE) {
return getAttributeValue(e, attrName);
} else if (namespaceURI == null) {
if (e.getLocalName() == null) { // No namespaces
return getAttributeValue(e, attrName);
} else {
NamedNodeMap attrs = e.getAttributes();
int l = attrs.getLength();
for (int i = 0; i < l; i++) {
Attr attr = (Attr)attrs.item(i);
if (attrName.equals(attr.getLocalName()) ||
(attr.getLocalName() == null && attrName.equals(attr.getNodeName()))) {
return attr.getValue();
}
}
return null;
}
} else {
return e.hasAttributeNS(namespaceURI, attrName) ? e.getAttributeNS(namespaceURI, attrName) : null;
}
}
public String getClass(org.w3c.dom.Element e) {
return null;
}
public String getID(org.w3c.dom.Element e) {
return null;
}
public String getLang(org.w3c.dom.Element e) {
return e.getAttribute("lang");
}
public String getElementStyling(org.w3c.dom.Element e) {
return null;
}
public String getNonCssStyling(Element e) {
return null;
}
public String getLinkUri(org.w3c.dom.Element e) {
return null;
}
public String getDocumentTitle(org.w3c.dom.Document doc) {
return null;
}
public String getAnchorName(Element e) {
return null;
}
public boolean isImageElement(Element e) {
return false;
}
public String getImageSourceURI(Element e) {
return null;
}
public boolean isFormElement(Element e) {
return false;
}
private Pattern _typePattern = Pattern.compile("type\\s?=\\s?");
private Pattern _hrefPattern = Pattern.compile("href\\s?=\\s?");
private Pattern _titlePattern = Pattern.compile("title\\s?=\\s?");
private Pattern _alternatePattern = Pattern.compile("alternate\\s?=\\s?");
private Pattern _mediaPattern = Pattern.compile("media\\s?=\\s?");
public StylesheetInfo[] getStylesheets(org.w3c.dom.Document doc) {
List list = new ArrayList<>();
//get the processing-instructions (actually for XmlDocuments)
//type and href are required to be set
NodeList nl = doc.getChildNodes();
for (int i = 0, len = nl.getLength(); i < len; i++) {
Node node = nl.item(i);
if (node.getNodeType() != Node.PROCESSING_INSTRUCTION_NODE) continue;
ProcessingInstruction piNode = (ProcessingInstruction) node;
if (!piNode.getTarget().equals("xml-stylesheet")) continue;
StylesheetInfo info;
info = new StylesheetInfo();
info.setOrigin(StylesheetInfo.AUTHOR);
String pi = piNode.getData();
Matcher m = _alternatePattern.matcher(pi);
if (m.matches()) {
int start = m.end();
String alternate = pi.substring(start + 1, pi.indexOf(pi.charAt(start), start + 1));
//TODO: handle alternate stylesheets
if (alternate.equals("yes")) continue;//DON'T get alternate stylesheets for now
}
m = _typePattern.matcher(pi);
if (m.find()) {
int start = m.end();
String type = pi.substring(start + 1, pi.indexOf(pi.charAt(start), start + 1));
//TODO: handle other stylesheet types
if (!type.equals("text/css")) continue;//for now
info.setType(type);
}
m = _hrefPattern.matcher(pi);
if (m.find()) {
int start = m.end();
String href = pi.substring(start + 1, pi.indexOf(pi.charAt(start), start + 1));
info.setUri(href);
}
m = _titlePattern.matcher(pi);
if (m.find()) {
int start = m.end();
String title = pi.substring(start + 1, pi.indexOf(pi.charAt(start), start + 1));
info.setTitle(title);
}
m = _mediaPattern.matcher(pi);
if (m.find()) {
int start = m.end();
String media = pi.substring(start + 1, pi.indexOf(pi.charAt(start), start + 1));
info.setMedia(media);
} else {
info.addMedium("screen");
}
list.add(info);
}
return list.toArray(new StylesheetInfo[list.size()]);
}
public StylesheetInfo getDefaultStylesheet(StylesheetFactory factory) {
return null;
}
}