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/*******************************************************************************
* Copyright (c) 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jst.jsp.ui.internal.taginfo;
import java.io.IOException;
import java.io.Reader;
import java.net.URL;
import org.eclipse.jst.jsp.ui.internal.Logger;
import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTError;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.widgets.Display;
/**
* Provides a set of convenience methods for creating HTML pages.
*
* Based on org.eclipse.jdt.internal.ui.text.HTMLPrinter
*/
class HTMLPrinter {
static RGB BG_COLOR_RGB = null;
static {
final Display display = Display.getDefault();
if (display != null && !display.isDisposed()) {
try {
display.asyncExec(new Runnable() {
/*
* @see java.lang.Runnable#run()
*/
public void run() {
BG_COLOR_RGB = display.getSystemColor(SWT.COLOR_INFO_BACKGROUND).getRGB();
}
});
}
catch (SWTError err) {
// see: https://bugs.eclipse.org/bugs/show_bug.cgi?id=45294
if (err.code != SWT.ERROR_DEVICE_DISPOSED)
throw err;
}
}
}
private HTMLPrinter() {
// nothing
}
private static String replace(String text, char c, String s) {
int previous = 0;
int current = text.indexOf(c, previous);
if (current == -1)
return text;
StringBuffer buffer = new StringBuffer();
while (current > -1) {
buffer.append(text.substring(previous, current));
buffer.append(s);
previous = current + 1;
current = text.indexOf(c, previous);
}
buffer.append(text.substring(previous));
return buffer.toString();
}
public static String convertToHTMLContent(String content) {
content = replace(content, '&', "&"); //$NON-NLS-1$
content = replace(content, '"', """); //$NON-NLS-1$
content = replace(content, '<', "<"); //$NON-NLS-1$
return replace(content, '>', ">"); //$NON-NLS-1$
}
static String read(Reader rd) {
StringBuffer buffer = new StringBuffer();
char[] readBuffer = new char[2048];
try {
int n = rd.read(readBuffer);
while (n > 0) {
buffer.append(readBuffer, 0, n);
n = rd.read(readBuffer);
}
return buffer.toString();
}
catch (IOException x) {
// never expected
Logger.log(Logger.WARNING_DEBUG, x.getMessage(), x);
}
return null;
}
public static void insertPageProlog(StringBuffer buffer, int position, RGB bgRGB, URL styleSheetURL) {
if (bgRGB == null)
insertPageProlog(buffer, position, styleSheetURL);
else {
StringBuffer pageProlog = new StringBuffer(300);
pageProlog.append("<html>"); //$NON-NLS-1$
appendStyleSheetLink(pageProlog, styleSheetURL);
pageProlog.append("<body text=\"#000000\" bgcolor=\""); //$NON-NLS-1$
appendColor(pageProlog, bgRGB);
pageProlog.append("\"><font size=-1>"); //$NON-NLS-1$
buffer.insert(position, pageProlog.toString());
}
}
public static void insertPageProlog(StringBuffer buffer, int position, RGB bgRGB) {
if (bgRGB == null)
insertPageProlog(buffer, position);
else {
StringBuffer pageProlog = new StringBuffer(60);
pageProlog.append("<html><body text=\"#000000\" bgcolor=\""); //$NON-NLS-1$
appendColor(pageProlog, bgRGB);
pageProlog.append("\"><font size=-1>"); //$NON-NLS-1$
buffer.insert(position, pageProlog.toString());
}
}
private static void appendStyleSheetLink(StringBuffer buffer, URL styleSheetURL) {
if (styleSheetURL == null)
return;
buffer.append("<head>"); //$NON-NLS-1$
buffer.append("<LINK REL=\"stylesheet\" HREF= \""); //$NON-NLS-1$
buffer.append(styleSheetURL);
buffer.append("\" CHARSET=\"ISO-8859-1\" TYPE=\"text/css\">"); //$NON-NLS-1$
buffer.append("</head>"); //$NON-NLS-1$
}
private static void appendColor(StringBuffer buffer, RGB rgb) {
buffer.append('#');
buffer.append(Integer.toHexString(rgb.red));
buffer.append(Integer.toHexString(rgb.green));
buffer.append(Integer.toHexString(rgb.blue));
}
public static void insertPageProlog(StringBuffer buffer, int position) {
insertPageProlog(buffer, position, getBgColor());
}
public static void insertPageProlog(StringBuffer buffer, int position, URL styleSheetURL) {
insertPageProlog(buffer, position, getBgColor(), styleSheetURL);
}
private static RGB getBgColor() {
if (BG_COLOR_RGB != null)
return BG_COLOR_RGB;
// RGB value of info bg color on WindowsXP
return new RGB(255, 255, 225);
}
public static void addPageProlog(StringBuffer buffer) {
insertPageProlog(buffer, buffer.length());
}
public static void addPageEpilog(StringBuffer buffer) {
buffer.append("</font></body></html>"); //$NON-NLS-1$
}
public static void startBulletList(StringBuffer buffer) {
buffer.append("<ul>"); //$NON-NLS-1$
}
public static void endBulletList(StringBuffer buffer) {
buffer.append("</ul>"); //$NON-NLS-1$
}
public static void addBullet(StringBuffer buffer, String bullet) {
if (bullet != null) {
buffer.append("<li>"); //$NON-NLS-1$
buffer.append(bullet);
buffer.append("</li>"); //$NON-NLS-1$
}
}
public static void addSmallHeader(StringBuffer buffer, String header) {
if (header != null) {
buffer.append("<h5>"); //$NON-NLS-1$
buffer.append(header);
buffer.append("</h5>"); //$NON-NLS-1$
}
}
public static void addParagraph(StringBuffer buffer, String paragraph) {
if (paragraph != null) {
buffer.append("<p>"); //$NON-NLS-1$
buffer.append(paragraph);
}
}
public static void addParagraph(StringBuffer buffer, Reader paragraphReader) {
if (paragraphReader != null)
addParagraph(buffer, read(paragraphReader));
}
}
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