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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.
/*
* 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.extend;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
/**
* Handles xhtml documents, including presentational html attributes (see css 2.1 spec, 6.4.4).
* In this class ONLY handling (css equivalents) of presentational properties
* (according to css 2.1 spec, section 6.4.4) should be specified.
*
* @author Torbjoern Gannholm
*/
public class XhtmlNamespaceHandler extends XhtmlCssOnlyNamespaceHandler {
/**
* {@inheritDoc}
*/
public boolean isImageElement(Element e) {
return (e != null && e.getNodeName().equalsIgnoreCase("img"));
}
/**
* {@inheritDoc}
*/
public boolean isFormElement(Element e) {
return (e != null && e.getNodeName().equalsIgnoreCase("form"));
}
public String getImageSourceURI(Element e) {
String uri = null;
if (e != null) {
uri = e.getAttribute("src");
}
return uri;
}
public String getNonCssStyling(Element e) {
if (e.getNodeName().equals("table")) {
return applyTableStyles(e);
} else if (e.getNodeName().equals("td") || e.getNodeName().equals("th")) {
return applyTableCellStyles(e);
} else if (e.getNodeName().equals("tr")) {
return applyTableRowStyles(e);
} else if (e.getNodeName().equals("img")) {
return applyImgStyles(e);
} else if (e.getNodeName().equals("p") || e.getNodeName().equals("div")) {
return applyBlockAlign(e);
} else if (e.getNodeName().equals("textarea")) {
return applyTextareaStyles(e);
} else if (e.getNodeName().equals("input")) {
return applyInputStyles(e);
}
return "";
}
private String applyInputStyles(Element e) {
StringBuilder sb = new StringBuilder();
if (e.hasAttribute("width") && isInteger(e.getAttribute("width"))) {
sb.append("width: ");
sb.append(e.getAttribute("width"));
sb.append("px;");
} else if (e.hasAttribute("size") && isInteger(e.getAttribute("size"))) {
sb.append("width: ");
sb.append(e.getAttribute("size"));
sb.append("em;");
}
return sb.toString();
}
private String applyTextareaStyles(Element e) {
StringBuilder sb = new StringBuilder();
if (e.hasAttribute("cols") && isInteger(e.getAttribute("cols"))) {
sb.append("width: ");
sb.append(e.getAttribute("cols"));
sb.append("em;");
}
if (e.hasAttribute("rows") && isInteger(e.getAttribute("rows"))) {
sb.append("height: ");
sb.append(e.getAttribute("rows"));
sb.append("em;");
}
return sb.toString();
}
private String applyBlockAlign(Element e) {
StringBuffer style = new StringBuffer();
applyTextAlign(e, style);
return style.toString();
}
private String applyImgStyles(Element e) {
StringBuffer style = new StringBuffer();
applyFloatingAlign(e, style);
return style.toString();
}
private String applyTableCellStyles(Element e) {
StringBuffer style = new StringBuffer();
String s;
//check for cellpadding
Element table = findTable(e);
if (table != null) {
s = getAttribute(table, "cellpadding");
if (s != null) {
style.append("padding: ");
style.append(convertToLength(s));
style.append(";");
}
s = getAttribute(table, "border");
if (s != null && ! s.equals("0")) {
style.append("border: 1px outset black;");
}
}
s = getAttribute(e, "width");
if (s != null) {
style.append("width: ");
style.append(convertToLength(s));
style.append(";");
}
s = getAttribute(e, "height");
if (s != null) {
style.append("height: ");
style.append(convertToLength(s));
style.append(";");
}
applyTableContentAlign(e, style);
s = getAttribute(e, "bgcolor");
if (s != null) {
s = s.toLowerCase();
style.append("background-color: ");
if (looksLikeAMangledColor(s)) {
style.append('#');
style.append(s);
} else {
style.append(s);
}
style.append(';');
}
s = getAttribute(e, "background");
if (s != null) {
style.append("background-image: url(");
style.append(s);
style.append(");");
}
return style.toString();
}
private String applyTableStyles(Element e) {
StringBuffer style = new StringBuffer();
String s;
s = getAttribute(e, "width");
if (s != null) {
style.append("width: ");
style.append(convertToLength(s));
style.append(";");
}
s = getAttribute(e, "border");
if (s != null) {
style.append("border: ");
style.append(convertToLength(s));
style.append(" inset black;");
}
s = getAttribute(e, "cellspacing");
if (s != null) {
style.append("border-collapse: separate; border-spacing: ");
style.append(convertToLength(s));
style.append(";");
}
s = getAttribute(e, "bgcolor");
if (s != null) {
s = s.toLowerCase();
style.append("background-color: ");
if (looksLikeAMangledColor(s)) {
style.append('#');
style.append(s);
} else {
style.append(s);
}
style.append(';');
}
s = getAttribute(e, "background");
if (s != null) {
style.append("background-image: url(");
style.append(s);
style.append(");");
}
applyFloatingAlign(e, style);
return style.toString();
}
private String applyTableRowStyles(Element e) {
StringBuffer style = new StringBuffer();
applyTableContentAlign(e, style);
return style.toString();
}
private void applyFloatingAlign(Element e, StringBuffer style) {
String s;
s = getAttribute(e, "align");
if (s != null) {
s = s.toLowerCase().trim();
if (s.equals("left")) {
style.append("float: left;");
} else if (s.equals("right")) {
style.append("float: right;");
} else if (s.equals("center")) {
style.append("margin-left: auto; margin-right: auto;");
}
}
}
private void applyTextAlign(Element e, StringBuffer style) {
String s;
s = getAttribute(e, "align");
if (s != null) {
s = s.toLowerCase().trim();
if (s.equals("left") || s.equals("right") ||
s.equals("center") || s.equals("justify")) {
style.append("text-align: ");
style.append(s);
style.append(";");
}
}
}
private void applyTableContentAlign(Element e, StringBuffer style) {
String s;
s = getAttribute(e, "align");
if (s != null) {
style.append("text-align: ");
style.append(s.toLowerCase());
style.append(";");
}
s = getAttribute(e, "valign");
if (s != null) {
style.append("vertical-align: ");
style.append(s.toLowerCase());
style.append(";");
}
}
private boolean looksLikeAMangledColor(String s) {
if (s.length() != 6) {
return false;
}
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
boolean valid = (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f');
if (! valid) {
return false;
}
}
return true;
}
private Element findTable(Element cell) {
Node n = cell.getParentNode();
Element next;
if (n.getNodeType() == Node.ELEMENT_NODE) {
next = (Element)n;
if (next.getNodeName().equals("tr")) {
n = next.getParentNode();
if (n.getNodeType() == Node.ELEMENT_NODE) {
next = (Element)n;
String name = next.getNodeName();
if (name.equals("table")) {
return next;
}
if (name.equals("tbody") || name.equals("tfoot") || name.equals("thead")) {
n = next.getParentNode();
if (n.getNodeType() == Node.ELEMENT_NODE) {
next =(Element)n;
if (next.getNodeName().equals("table")) {
return next;
}
}
}
}
}
}
return null;
}
}