/**
* Copyright (c) 2005-2006 Aptana, Inc.
*
* 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. If redistributing this code,
* this entire header must remain intact.
*/
package com.aptana.ide.editors.unified.utils;
/***********************************************************************************************************************
* Copyright (c) 2000, 2005 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
**********************************************************************************************************************/
// copied directly from org.eclipse.jface.internal.text.link.contentassist.LineBreakingReader;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.Reader;
import java.text.BreakIterator;
import org.eclipse.swt.graphics.GC;
/**
* Not a real reader. Could change if requested
*/
public class LineBreakingReader
{
private BufferedReader fReader;
private GC fGC;
private int fMaxWidth;
private String fLine;
private int fOffset;
private BreakIterator fLineBreakIterator;
/**
* 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 (in 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();
}
/**
* isFormattedLine
*
* @return boolean
*/
public boolean isFormattedLine()
{
return fLine != null;
}
/**
* readLine
*
* @return String
* @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 tempOffset = currOffset;
int currWidth = 0;
int nextOffset = fLineBreakIterator.following(tempOffset);
while (nextOffset != BreakIterator.DONE)
{
String word = fLine.substring(tempOffset, nextOffset);
int wordWidth = fGC.textExtent(word).x;
int nextWidth = wordWidth + currWidth;
if (nextWidth > fMaxWidth)
{
if (currWidth > 0)
{
return tempOffset;
}
return nextOffset;
}
currWidth = nextWidth;
tempOffset = nextOffset;
nextOffset = fLineBreakIterator.next();
}
return nextOffset;
}
private int findWordBegin(int idx)
{
int index = idx;
while (index < fLine.length() && Character.isWhitespace(fLine.charAt(index)))
{
index++;
}
return index;
}
}