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/*
* Copyright 1998 Finn Bock.
*
* This program contains material copyrighted by:
* Copyright (c) 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
* The Netherlands.
*/
package org.python.modules;
import org.python.core.Py;
import org.python.core.PyCallIter;
import org.python.core.PyList;
import org.python.core.PyObject;
import org.python.core.PyString;
/**
* This module implements a file-like class, StringIO, that reads and
* writes a string buffer (also known as memory files).
* See the description on file objects for operations.
* @author Finn Bock, [email protected]
* @version cStringIO.java,v 1.10 1999/05/20 18:03:20 fb Exp
*/
public class cStringIO {
/**
* Create an empty StringIO object
* @return a new StringIO object.
*/
public static StringIO StringIO() {
return new StringIO();
}
/**
* Create a StringIO object, initialized by the value.
* @param buf The initial value.
* @return a new StringIO object.
*/
public static StringIO StringIO(String buf) {
return new StringIO(buf);
}
/**
* The StringIO object
* @see cStringIO#StringIO()
* @see cStringIO#StringIO(String)
*/
public static class StringIO extends PyObject {
transient public boolean softspace = false;
//transient public String name = "";
//transient public String mode = "w";
transient public boolean closed = false;
transient private char[] buf;
transient private int count;
transient private int pos;
StringIO() {
this.buf = new char[16];
}
StringIO(String buf) {
this.buf = new char[buf.length() + 16];
write(buf);
seek(0);
}
public void __setattr__(String name, PyObject value) {
if (name == "softspace") {
softspace = value.__nonzero__();
return;
}
super.__setattr__(name, value);
}
public PyObject __iter__() {
return new PyCallIter(__getattr__("readline"), Py.newString(""));
}
/**
* Free the memory buffer.
*/
public void close() {
buf = null;
closed = true;
}
/**
* Return false.
* @return false.
*/
public boolean isatty() {
return false;
}
/**
* Position the file pointer to the absolute position.
* @param pos the position in the file.
*/
public void seek(long pos) {
seek(pos, 0);
}
/**
* Position the file pointer to the position in the .
* @param pos the position in the file.
* @param mode; 0=from the start, 1=relative, 2=from the end.
*/
public void seek(long pos, int mode) {
if (mode == 1)
this.pos = (int)pos + this.pos;
else if (mode == 2)
this.pos = (int)pos + count;
else
this.pos = Math.max(0, (int)pos);
}
/**
* Reset the file position to the beginning of the file.
*/
public void reset() {
pos = 0;
}
/**
* Return the file position.
* @returns the position in the file.
*/
public long tell() {
return pos;
}
/**
* Read all data until EOF is reached.
* An empty string is returned when EOF is encountered immediately.
* @returns A string containing the data.
*/
public String read() {
return read(-1);
}
/**
* Read at most size bytes from the file (less if the read hits EOF).
* If the size argument is negative, read all data until EOF is
* reached. An empty string is returned when EOF is encountered
* immediately.
* @param size the number of characters to read.
* @returns A string containing the data read.
*/
public String read(int size) {
opencheck();
int newpos = (size < 0) ? count : Math.min(pos+size, count);
String r = null;
if (size == 1 && newpos > pos) {
r = cStringIO.getString(buf[pos]);
} else {
r = new String(buf, pos, newpos-pos);
}
pos = newpos;
return r;
}
private int indexOf(char ch, int pos) {
for (int i = pos; i < count; i++) {
if (buf[i] == ch)
return i;
}
return -1;
}
/**
* Read one entire line from the file. A trailing newline character
* is kept in the string (but may be absent when a file ends with
* an incomplete line).
* An empty string is returned when EOF is hit immediately.
* @returns data from the file up to and including the newline.
*/
public String readline() {
return readline(-1);
}
/**
* Read one entire line from the file. A trailing newline character
* is kept in the string (but may be absent when a file ends with an
* incomplete line).
* If the size argument is non-negative, it is a maximum byte count
* (including the trailing newline) and an incomplete line may be
* returned.
* @returns data from the file up to and including the newline.
*/
public String readline(int length) {
opencheck();
int i = indexOf('\n', pos);
int newpos = (i < 0) ? count : i+1;
if (length != -1 && pos + length < newpos)
newpos = pos + length;
String r = new String(buf, pos, newpos-pos);
pos = newpos;
return r;
}
/**
* Read and return a line without the trailing newling.
* Usind by cPickle as an optimization.
*/
public String readlineNoNl() {
int i = indexOf('\n', pos);
int newpos = (i < 0) ? count : i;
String r = new String(buf, pos, newpos-pos);
pos = newpos;
if (pos < count) // Skip the newline
pos++;
return r;
}
/**
* Read until EOF using readline() and return a list containing
* the lines thus read.
* @return a list of the lines.
*/
public PyObject readlines() {
return readlines(0);
}
/**
* Read until EOF using readline() and return a list containing
* the lines thus read.
* @return a list of the lines.
*/
public PyObject readlines(int sizehint) {
opencheck();
int total = 0;
PyList lines = new PyList();
String line = readline();
while (line.length() > 0) {
lines.append(new PyString(line));
total += line.length();
if (0 < sizehint && sizehint <= total)
break;
line = readline();
}
return lines;
}
/**
* truncate the file at the current position.
*/
public void truncate() {
truncate(-1);
}
/**
* truncate the file at the position pos.
*/
public void truncate(int pos) {
opencheck();
if (pos < 0)
pos = this.pos;
if (count > pos)
count = pos;
}
private void expandCapacity(int newLength) {
int newCapacity = (buf.length + 1) * 2;
if (newLength > newCapacity) {
newCapacity = newLength;
}
char newBuf[] = new char[newCapacity];
System.arraycopy(buf, 0, newBuf, 0, count);
buf = newBuf;
//System.out.println("newleng:" + newCapacity);
}
/**
* Write a string to the file.
* @param s The data to write.
*/
public void write(String s) {
opencheck();
int newpos = pos + s.length();
if (newpos >= buf.length)
expandCapacity(newpos);
if (newpos > count)
count = newpos;
s.getChars(0, s.length(), buf, pos);
pos = newpos;
}
/**
* Write a char to the file. Used by cPickle as an optimization.
* @param ch The data to write.
*/
public void writeChar(char ch) {
if (pos+1 >= buf.length)
expandCapacity(pos+1);
buf[pos++] = ch;
if (pos > count)
count = pos;
}
/**
* Write a list of strings to the file.
*/
public void writelines(String[] lines) {
for (int i = 0; i < lines.length; i++) {
write(lines[i]);
}
}
/**
* Flush the internal buffer. Does nothing.
*/
public void flush() {
opencheck();
}
/**
* Retrieve the entire contents of the ``file'' at any time
* before the StringIO object's close() method is called.
* @return the contents of the StringIO.
*/
public String getvalue() {
opencheck();
return new String(buf, 0, count);
}
private final void opencheck() {
if (buf == null)
throw Py.ValueError("I/O operation on closed file");
}
}
private static String[] strings = new String[256];
static String getString(char ch) {
if ((int)ch > 255) {
return new String(new char[] { ch });
}
String s = strings[(int)ch];
if (s == null) {
s = new String(new char[] { ch });
strings[(int)ch] = s;
}
return s;
}
}
