content: // COPIED FROM org.eclipse.jface.internal.text.html
  // to get around "discouraged access" errors
  /*******************************************************************************
   * Copyright (c) 2000, 2008 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.wst.jsdt.internal.ui.text.html;
  
  import java.io.IOException;
  import java.io.Reader;
  import java.net.URL;
  
  import org.eclipse.swt.SWT;
  import org.eclipse.swt.SWTError;
  import org.eclipse.swt.graphics.FontData;
  import org.eclipse.swt.graphics.RGB;
  import org.eclipse.swt.widgets.Display;
  
  
  /**
   * Provides a set of convenience methods for creating HTML pages.
   * <p>
   * Moved into this package from <code>org.eclipse.jface.internal.text.revisions</code>.</p>
   */
  public class HTMLPrinter {
  
  	private 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() {
  	}
  
  	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, '&', "&amp;"); //$NON-NLS-1$
  		content= replace(content, '"', "&quot;"); //$NON-NLS-1$
  		content= replace(content, '<', "&lt;"); //$NON-NLS-1$
  		return replace(content, '>', "&gt;"); //$NON-NLS-1$
  	}
  
  	public 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) {
  		}
  
  		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>"); //$NON-NLS-1$
  
  			appendStyleSheetURL(pageProlog, styleSheetURL);
  
  			pageProlog.append("<body text=\"#000000\" bgcolor=\""); //$NON-NLS-1$
  			appendColor(pageProlog, bgRGB);
  			pageProlog.append("\">"); //$NON-NLS-1$
  
  			buffer.insert(position,  pageProlog.toString());
  		}
  	}
  	public static void insertPageProlog(StringBuffer buffer, int position, RGB bgRGB, String styleSheet) {
  		
  		if (bgRGB == null)
  			insertPageProlog(buffer, position, styleSheet);
  		else {
  			StringBuffer pageProlog= new StringBuffer(300);
  			
  			pageProlog.append("<html>"); //$NON-NLS-1$
  			
  			appendStyleSheetURL(pageProlog, styleSheet);
  			
  			pageProlog.append("<body text=\"#000000\" bgcolor=\""); //$NON-NLS-1$
  			appendColor(pageProlog, bgRGB);
  			pageProlog.append("\">"); //$NON-NLS-1$
  			
  			buffer.insert(position,  pageProlog.toString());
  		}
  	}
  
  	public static void insertStyles(StringBuffer buffer, String[] styles) {
  		if (styles == null || styles.length == 0)
  			return;
  
  		StringBuffer styleBuf= new StringBuffer(10 * styles.length);
  		for (int i= 0; styles != null && i < styles.length; i++) {
  			styleBuf.append(" style=\""); //$NON-NLS-1$
  			styleBuf.append(styles[i]);
  			styleBuf.append('"');
  		}
  
  		// Find insertion index
  		// a) within existing body tag with trailing space 
  		int index= buffer.indexOf("<body "); //$NON-NLS-1$
  		if (index != -1) {
  			buffer.insert(index+5, styleBuf);
  			return;
  		}
  
  		// b) within existing body tag without attributes
  		index= buffer.indexOf("<body>"); //$NON-NLS-1$
  		if (index != -1) {
  			buffer.insert(index+5, ' ');
  			buffer.insert(index+6, styleBuf);
  			return;
  		}
  	}
  
  	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("\">"); //$NON-NLS-1$
  			buffer.insert(position,  pageProlog.toString());
  		}
  	}
  
  	private static void appendStyleSheetURL(StringBuffer buffer, String styleSheet) {
  		if (styleSheet == null)
  			return;
  		
  		buffer.append("<head><style CHARSET=\"ISO-8859-1\" TYPE=\"text/css\">"); //$NON-NLS-1$
  		buffer.append(styleSheet);
  		buffer.append("</style></head>"); //$NON-NLS-1$
  	}
  	
  	private static void appendStyleSheetURL(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); 
  	}
  	
  	public static void insertPageProlog(StringBuffer buffer, int position, String styleSheet) {
  		insertPageProlog(buffer, position, getBgColor(), styleSheet); 
  	}
  
  	private static RGB getBgColor() {
  		if (BG_COLOR_RGB != null)
  			return BG_COLOR_RGB;
  		return new RGB(255,255, 225); // RGB value of info bg color on WindowsXP
  
  	}
  
  	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));
  	}
  	
  	/**
  	 * Replaces the following style attributes of the font definition of the <code>html</code>
  	 * element:
  	 * <ul>
  	 * <li>font-size</li>
  	 * <li>font-weight</li>
  	 * <li>font-style</li>
  	 * <li>font-family</li>
  	 * </ul>
  	 * The font's name is used as font family, a <code>sans-serif</code> default font family is
  	 * appended for the case that the given font name is not available.
  	 * <p>
  	 * If the listed font attributes are not contained in the passed style list, nothing happens.
  	 * </p>
  	 * 
  	 * @param styles CSS style definitions
  	 * @param fontData the font information to use
  	 * @return the modified style definitions
  	 * 
  	 */
  	public static String convertTopLevelFont(String styles, FontData fontData) {
  		boolean bold= (fontData.getStyle() & SWT.BOLD) != 0;
  		boolean italic= (fontData.getStyle() & SWT.ITALIC) != 0;
  		
  		// See: https://bugs.eclipse.org/bugs/show_bug.cgi?id=155993
  		String size= Integer.toString(fontData.getHeight()) + ("carbon".equals(SWT.getPlatform()) ? "px" : "pt"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
  		
  		String family= "'" + fontData.getName() + "',sans-serif"; //$NON-NLS-1$ //$NON-NLS-2$
  		styles= styles.replaceFirst("(html\\s*\\{.*(?:\\s|;)font-size:\\s*)\\d+pt(\\;?.*\\})", "$1" + size + "$2"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
  		styles= styles.replaceFirst("(html\\s*\\{.*(?:\\s|;)font-weight:\\s*)\\w+(\\;?.*\\})", "$1" + (bold ? "bold" : "normal") + "$2"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$
  		styles= styles.replaceFirst("(html\\s*\\{.*(?:\\s|;)font-style:\\s*)\\w+(\\;?.*\\})", "$1" + (italic ? "italic" : "normal") + "$2"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$
  		styles= styles.replaceFirst("(html\\s*\\{.*(?:\\s|;)font-family:\\s*).+?(;.*\\})", "$1" + family + "$2"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
  		return styles;
  	}
  }
  