// 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.BufferedReader;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.util.Iterator;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.graphics.Drawable;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.widgets.Display;
import org.eclipse.jface.text.DefaultInformationControl;
import org.eclipse.jface.text.Region;
import org.eclipse.jface.text.TextPresentation;
import com.ibm.icu.text.BreakIterator;
/**
* <p>
* Moved into this package from <code>org.eclipse.jface.internal.text.revisions</code>.</p>
*/
public class HTMLTextPresenter implements DefaultInformationControl.IInformationPresenter, DefaultInformationControl.IInformationPresenterExtension {
public class LineBreakingReader {
private BufferedReader fReader;
private GC fGC;
private int fMaxWidth;
private String fLine;
private int fOffset;
private BreakIterator fLineBreakIterator;
private boolean fBreakWords;
/**
* Creates a reader that breaks an input text to fit in a given width.
*
* @param reader Reader of the input text
* @param gc The graphic context that defines the currently used font sizes
* @param maxLineWidth The max width (pixels) where the text has to fit in
*/
public LineBreakingReader(Reader reader, GC gc, int maxLineWidth) {
fReader= new BufferedReader(reader);
fGC= gc;
fMaxWidth= maxLineWidth;
fOffset= 0;
fLine= null;
fLineBreakIterator= BreakIterator.getLineInstance();
fBreakWords= true;
}
public boolean isFormattedLine() {
return fLine != null;
}
/**
* Reads the next line. The lengths of the line will not exceed the given maximum
* width.
*
* @return the next line
* @throws IOException
*/
public String readLine() throws IOException {
if (fLine == null) {
String line= fReader.readLine();
if (line == null)
return null;
int lineLen= fGC.textExtent(line).x;
if (lineLen < fMaxWidth) {
return line;
}
fLine= line;
fLineBreakIterator.setText(line);
fOffset= 0;
}
int breakOffset= findNextBreakOffset(fOffset);
String res;
if (breakOffset != BreakIterator.DONE) {
res= fLine.substring(fOffset, breakOffset);
fOffset= findWordBegin(breakOffset);
if (fOffset == fLine.length()) {
fLine= null;
}
} else {
res= fLine.substring(fOffset);
fLine= null;
}
return res;
}
private int findNextBreakOffset(int currOffset) {
int currWidth= 0;
int nextOffset= fLineBreakIterator.following(currOffset);
while (nextOffset != BreakIterator.DONE) {
String word= fLine.substring(currOffset, nextOffset);
int wordWidth= fGC.textExtent(word).x;
int nextWidth= wordWidth + currWidth;
if (nextWidth > fMaxWidth) {
if (currWidth > 0)
return currOffset;
if (!fBreakWords)
return nextOffset;
// need to fit into fMaxWidth
int length= word.length();
while (length >= 0) {
length--;
word= word.substring(0, length);
wordWidth= fGC.textExtent(word).x;
if (wordWidth + currWidth < fMaxWidth)
return currOffset + length;
}
return nextOffset;
}
currWidth= nextWidth;
currOffset= nextOffset;
nextOffset= fLineBreakIterator.next();
}
return nextOffset;
}
private int findWordBegin(int idx) {
while (idx < fLine.length() && Character.isWhitespace(fLine.charAt(idx))) {
idx++;
}
return idx;
}
}
private static final String LINE_DELIM= System.getProperty("line.separator", "\n"); //$NON-NLS-1$ //$NON-NLS-2$
private int fCounter;
private boolean fEnforceUpperLineLimit;
public HTMLTextPresenter(boolean enforceUpperLineLimit) {
super();
fEnforceUpperLineLimit= enforceUpperLineLimit;
}
public HTMLTextPresenter() {
this(true);
}
protected Reader createReader(String hoverInfo, TextPresentation presentation) {
return new HTML2TextReader(new StringReader(hoverInfo), presentation);
}
protected void adaptTextPresentation(TextPresentation presentation, int offset, int insertLength) {
int yoursStart= offset;
int yoursEnd= offset + insertLength -1;
yoursEnd= Math.max(yoursStart, yoursEnd);
Iterator e= presentation.getAllStyleRangeIterator();
while (e.hasNext()) {
StyleRange range= (StyleRange) e.next();
int myStart= range.start;
int myEnd= range.start + range.length -1;
myEnd= Math.max(myStart, myEnd);
if (myEnd < yoursStart)
continue;
if (myStart < yoursStart)
range.length += insertLength;
else
range.start += insertLength;
}
}
private void append(StringBuffer buffer, String string, TextPresentation presentation) {
int length= string.length();
buffer.append(string);
if (presentation != null)
adaptTextPresentation(presentation, fCounter, length);
fCounter += length;
}
private String getIndent(String line) {
int length= line.length();
int i= 0;
while (i < length && Character.isWhitespace(line.charAt(i))) ++i;
return (i == length ? line : line.substring(0, i)) + " "; //$NON-NLS-1$
}
/*
* @see IHoverInformationPresenter#updatePresentation(Display display, String, TextPresentation, int, int)
*/
public String updatePresentation(Display display, String hoverInfo, TextPresentation presentation, int maxWidth, int maxHeight) {
return updatePresentation((Drawable)display, hoverInfo, presentation, maxWidth, maxHeight);
}
/*
* @see IHoverInformationPresenterExtension#updatePresentation(Drawable drawable, String, TextPresentation, int, int)
*
*/
public String updatePresentation(Drawable drawable, String hoverInfo, TextPresentation presentation, int maxWidth, int maxHeight) {
if (hoverInfo == null)
return null;
GC gc= new GC(drawable);
try {
StringBuffer buffer= new StringBuffer();
int maxNumberOfLines= Math.round(maxHeight / gc.getFontMetrics().getHeight());
fCounter= 0;
LineBreakingReader reader= new LineBreakingReader(createReader(hoverInfo, presentation), gc, maxWidth);
boolean lastLineFormatted= false;
String lastLineIndent= null;
String line=reader.readLine();
boolean lineFormatted= reader.isFormattedLine();
boolean firstLineProcessed= false;
while (line != null) {
if (fEnforceUpperLineLimit && maxNumberOfLines <= 0)
break;
if (firstLineProcessed) {
if (!lastLineFormatted)
append(buffer, LINE_DELIM, null);
else {
append(buffer, LINE_DELIM, presentation);
if (lastLineIndent != null)
append(buffer, lastLineIndent, presentation);
}
}
append(buffer, line, null);
firstLineProcessed= true;
lastLineFormatted= lineFormatted;
if (!lineFormatted)
lastLineIndent= null;
else if (lastLineIndent == null)
lastLineIndent= getIndent(line);
line= reader.readLine();
lineFormatted= reader.isFormattedLine();
maxNumberOfLines--;
}
if (line != null) {
append(buffer, LINE_DELIM, lineFormatted ? presentation : null);
append(buffer, HTMLMessages.getString("HTMLTextPresenter.ellipse"), presentation); //$NON-NLS-1$
}
return trim(buffer, presentation);
} catch (IOException e) {
// ignore TODO do something else?
return null;
} finally {
gc.dispose();
}
}
private String trim(StringBuffer buffer, TextPresentation presentation) {
int length= buffer.length();
int end= length -1;
while (end >= 0 && Character.isWhitespace(buffer.charAt(end)))
-- end;
if (end == -1)
return ""; //$NON-NLS-1$
if (end < length -1)
buffer.delete(end + 1, length);
else
end= length;
int start= 0;
while (start < end && Character.isWhitespace(buffer.charAt(start)))
++ start;
buffer.delete(0, start);
presentation.setResultWindow(new Region(start, buffer.length()));
return buffer.toString();
}
}