procyberian/gcc
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Initial revision

Browse source 
From-SVN: r26263
This commit is contained in:
Tom Tromey 1999-04-07 14:42:40 +00:00
parent 140fa895c6
commit ee9dd3721b
370 changed files with 173494 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

245
libjava/java/io/LineNumberReader.java Normal file
View file

@ -0,0 +1,245 @@
/* Copyright (C) 1998, 1999 Cygnus Solutions
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
package java.io;
/**
* @author Per Bothner <bothner@cygnus.com>
* @date April 22, 1998.
*/
/* Written using "Java Class Libraries", 2nd edition, plus online
* API docs for JDK 1.2 beta from http://www.javasoft.com.
* Status: Believed complete and correct.
*
* This implementation has the feature that if '\r' is read, it
* does not look for a '\n', but immediately returns '\n'.
* On the next read(), if a '\n' is read, it is skipped.
* This has the advantage that we do not read (and hang) unnecessarily.
*
* This implementation is also minimal in the number of fields it uses.
*/
public class LineNumberReader extends BufferedReader
{
/** The current line number. */
int lineNumber;
public LineNumberReader(Reader in)
{
super(in, 8192);
}
public LineNumberReader(Reader in, int size)
{
super(in, size);
}
public int getLineNumber()
{
return lineNumber;
}
public void setLineNumber(int lineNumber)
{
this.lineNumber = lineNumber;
}
private static int countLines (char[] buffer, int off, int len)
{
int count = 0;
char prev = '\0';
for (int i = 0; i < len; i++)
{
char ch = buffer[i+off];
if ((ch == '\n' && prev != '\r') || ch == '\r')
count++;
prev = ch;
}
return count;
}
public void mark(int readLimit) throws IOException
{
synchronized (lock)
{
// This is basically the same as BufferedReader.mark.
// However, if the previous character was a '\r', we need to
// save that 'r', in case the next character is a '\n'.
if (pos + readLimit > limit)
{
int saveCR = (pos > 0 && buffer[pos-1] == '\r') ? 1 : 0;
char[] old_buffer = buffer;
if (readLimit > limit)
buffer = new char[saveCR + readLimit];
int copy_start = pos - saveCR;
limit -= copy_start;
System.arraycopy(old_buffer, copy_start, buffer, 0, limit);
pos = saveCR;
}
markPos = pos;
}
}
public void reset() throws IOException
{
synchronized (lock)
{
if (markPos < 0)
throw new IOException("mark never set or invalidated");
if (markPos > 0 && pos > markPos && buffer[markPos-1] == '\r'
&& buffer[markPos] == '\n')
lineNumber--;
lineNumber -= countLines(buffer, pos, markPos);
pos = markPos;
}
}
public int read() throws IOException
{
synchronized (lock)
{
skipRedundantLF();
if (pos >= limit)
{
if (markPos >= 0 && limit == buffer.length)
markPos = -1;
if (markPos <= 0)
pos = limit = 0;
int count = in.read(buffer, limit, buffer.length - limit);
if (count <= 0)
return -1;
limit += count;
}
char ch = buffer[pos++];
if (ch == '\r' || ch == '\n')
{
lineNumber++;
return '\n';
}
return (int) ch;
}
}
public int read(char[] buf, int offset, int count) throws IOException
{
if (count <= 0)
{
if (count < 0)
throw new IndexOutOfBoundsException();
return 0;
}
synchronized (lock)
{
int first = read();
if (first < 0)
return -1;
int start_offset = offset;
buf[offset++] = (char) first;
if (buffer[pos-1] == '\r' && pos < limit && buffer[pos] == '\n')
pos++;
count--;
while (count-- > 0 && pos < limit)
{
char ch = buffer[pos++];
if (ch == '\r')
{
lineNumber++;
ch = '\n';
if (pos < limit && buffer[pos] == '\n')
pos++;
}
else if (ch == '\n')
lineNumber++;
buf[offset++] = ch;
}
return offset - start_offset;
}
}
private void skipRedundantLF() throws IOException
{
if (pos > 0 && buffer[pos-1] == '\r')
{
if (pos < limit)
{ // fast case
if (buffer[pos] == '\n')
pos++;
}
else
{ // use read() to deal with the general case.
// Set pos and limit to zero to avoid infinite recursion in read.
// May need to invalidate markPos if we've exceeded the buffer.
if (pos >= buffer.length)
markPos = -1;
pos = limit = 0;
int ch = read();
if (ch >= 0 && ch != '\n')
pos--;
}
}
}
public String readLine() throws IOException
{
// BufferedReader.readLine already does this. Shouldn't need to keep
// track of newlines (since the read method deals with this for us).
// But if the buffer is large, we may not call the read method at all
// and super.readLine can't increment lineNumber itself.
// Though it may seem kludgy, the safest thing to do is to save off
// lineNumber and increment it explicitly when we're done (iff we
// ended with a '\n' or '\r' as opposed to EOF).
//
// Also, we need to undo the special casing done by BufferedReader.readLine
// when a '\r' is the last char in the buffer. That situation is marked
// by 'pos > limit'.
int tmpLineNumber = lineNumber;
skipRedundantLF();
String str = super.readLine();
if (pos > limit)
--pos;
int ch;
if (pos > 0 && ((ch = buffer[pos - 1]) == '\n' || ch == '\r'))
lineNumber = tmpLineNumber + 1;
return str;
}
public long skip(long count) throws IOException
{
if (count <= 0)
return 0;
long to_do = count;
do
{
int ch = read();
if (ch < 0)
break;
to_do--;
if (ch == '\n' || ch == '\r')
lineNumber++;
else
{
long fence = pos + to_do;
if (limit < fence)
fence = limit;
int end = pos;
for (; end < fence; end++)
{
char endch = buffer[end];
if (endch == '\n' || endch == '\r')
break;
}
to_do -= end - pos;
pos = end;
}
}
while (to_do > 0);
return count - to_do;
}
}