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/*******************************************************************************
* Copyright (c) 2000, 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.compare.internal.patch;
import java.io.*;
import java.util.*;
import org.eclipse.jface.util.Assert;
/* package */ class LineReader {
private boolean fHaveChar= false;
private int fLastChar;
private boolean fSawEOF= false;
private BufferedReader fReader;
private boolean fIgnoreSingleCR= false;
/* package */ LineReader(BufferedReader reader) {
fReader= reader;
Assert.isNotNull(reader);
}
void ignoreSingleCR() {
fIgnoreSingleCR= true;
}
/**
* Reads a line of text. A line is considered to be terminated by any one
* of a line feed ('\n'), a carriage return ('\r'), or a carriage return
* followed immediately by a linefeed.
* @return A string containing the contents of the line including
* the line-termination characters, or <code>null</code> if the end of the
* stream has been reached
* @exception IOException If an I/O error occurs
*/
/* package */ String readLine() throws IOException {
StringBuffer sb= null;
while (!fSawEOF) {
int c= readChar();
if (c == -1) {
fSawEOF= true;
break;
}
if (sb == null)
sb= new StringBuffer();
sb.append((char)c);
if (c == '\n')
break;
if (c == '\r') {
c= readChar();
if (c == -1) {
fSawEOF= true;
break; // EOF
}
if (c != '\n') {
if (fIgnoreSingleCR) {
sb.append((char)c);
continue;
}
fHaveChar= true;
fLastChar= c;
} else
sb.append((char)c);
break;
}
}
if (sb != null)
return sb.toString();
return null;
}
/* package */ void close() {
try {
fReader.close();
} catch (IOException ex) {
// silently ignored
}
}
/* package */ List readLines() {
try {
List lines= new ArrayList();
String line;
while ((line= readLine()) != null)
lines.add(line);
return lines;
} catch (IOException ex) {
// NeedWork
//System.out.println("error while reading file: " + fileName + "(" + ex + ")");
} finally {
close();
}
return null;
}
/**
* Returns the number of characters in the given string without
* counting a trailing line separator.
*/
/* package */ int lineContentLength(String line) {
if (line == null)
return 0;
int length= line.length();
for (int i= length-1; i >= 0; i--) {
char c= line.charAt(i);
if (c =='\n' || c == '\r')
length--;
else
break;
}
return length;
}
//---- private
private int readChar() throws IOException {
if (fHaveChar) {
fHaveChar= false;
return fLastChar;
}
return fReader.read();
}
}
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