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535 lines (435 loc) · 14.7 KB
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the Apache 2.0 License.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Text;
using Microsoft.Scripting.Runtime;
using IronPython.Runtime;
using IronPython.Runtime.Exceptions;
using IronPython.Runtime.Operations;
using IronPython.Runtime.Types;
[assembly: PythonModule("cStringIO", typeof(IronPython.Modules.PythonStringIO))]
namespace IronPython.Modules {
class StringStream {
private StringBuilder _data; // builder used for reading/writing
private string _lastValue; // a cached copy of the builder in string form
private int _position; // our current position in the builder
public StringStream(string data) {
_data = new StringBuilder(_lastValue = data);
_position = 0;
}
public bool EOF {
get { return _position >= _data.Length; }
}
public int Position {
get { return _position; }
}
public string Data {
get {
if (_lastValue == null) {
_lastValue = _data.ToString();
}
return _lastValue;
}
}
public string Prefix {
get {
return _data.ToString(0, _position);
}
}
public string Read(int i) {
if (_position + i > _data.Length) {
i = _data.Length - _position;
}
string ret = _data.ToString(_position, i);
_position += i;
return ret;
}
public string ReadLine(int size) {
if (size < 0) {
size = Int32.MaxValue;
}
int i = _position;
int count = 0;
while (i < _data.Length && count < size) {
char c = _data[i];
if (c == '\n' || c == '\r') {
i++;
if (c == '\r' && _position < _data.Length && _data[i] == '\n') {
i++;
}
// preserve newline character like StringIO
string res = _data.ToString(_position, i - _position);
_position = i;
return res;
}
i++;
count++;
}
if (i > _position) {
string res = _data.ToString(_position, i - _position);
_position = i;
return res;
}
return "";
}
public string ReadToEnd() {
if (_position < _data.Length) {
string res = _data.ToString(_position, _data.Length - _position);
_position = _data.Length;
return res;
}
return String.Empty;
}
public void Reset() {
_position = 0;
}
public int Seek(int offset, SeekOrigin origin) {
switch (origin) {
case SeekOrigin.Begin:
_position = offset; break;
case SeekOrigin.Current:
_position = _position + offset; break;
case SeekOrigin.End:
_position = _data.Length + offset; break;
default:
throw new ValueErrorException("origin");
}
return _position;
}
public void Truncate() {
_lastValue = null;
_data.Length = _position;
}
public void Truncate(int size) {
_lastValue = null;
if (size > _data.Length) {
size = _data.Length;
} else if (size < 0) {
throw PythonOps.IOError("(22, 'Negative size not allowed')");
}
_data.Length = size;
_position = size;
}
internal void Write(string s) {
if (_data.Length < _position) {
_data.Length = _position;
}
_lastValue = null;
if (_position == _data.Length) {
_data.Append(s);
} else {
// replace the existing text
_data.Remove(_position, Math.Min(s.Length, _data.Length - _position));
_data.Insert(_position, s);
}
_position += s.Length;
}
}
public static class PythonStringIO {
public static PythonType InputType = DynamicHelpers.GetPythonTypeFromType(typeof(StringI));
public static PythonType OutputType = DynamicHelpers.GetPythonTypeFromType(typeof(StringO));
public const string __doc__ = "Provides file like objects for reading and writing to strings.";
[PythonType, PythonHidden]
public class StringI : IEnumerator<string>, IEnumerator {
private StringStream _sr;
private string _enumValue;
internal StringI(string data) {
_sr = new StringStream(data);
}
public void close() {
_sr = null;
}
public bool closed {
get {
return _sr == null;
}
}
public void flush() {
ThrowIfClosed();
}
public string getvalue() {
ThrowIfClosed();
return _sr.Data;
}
public string getvalue(bool usePos) {
return _sr.Prefix;
}
public bool isatty() {
ThrowIfClosed();
return false;
}
public object __iter__() {
return this;
}
public string next() {
ThrowIfClosed();
if (_sr.EOF) {
throw PythonOps.StopIteration();
}
return readline();
}
public string read() {
ThrowIfClosed();
return _sr.ReadToEnd();
}
public string read(int s) {
ThrowIfClosed();
return (s < 0) ? _sr.ReadToEnd() : _sr.Read(s);
}
public string readline() {
ThrowIfClosed();
return _sr.ReadLine(-1);
}
public string readline(int size) {
ThrowIfClosed();
return _sr.ReadLine(size);
}
public List readlines() {
ThrowIfClosed();
List list = PythonOps.MakeList();
while (!_sr.EOF) {
list.AddNoLock(readline());
}
return list;
}
public List readlines(int size) {
ThrowIfClosed();
List list = PythonOps.MakeList();
while (!_sr.EOF) {
string line = readline();
list.AddNoLock(line);
if (line.Length >= size) break;
size -= line.Length;
}
return list;
}
public void reset() {
ThrowIfClosed();
_sr.Reset();
}
public void seek(int position) {
seek(position, 0);
}
public void seek(int position, int mode) {
ThrowIfClosed();
SeekOrigin so;
switch (mode) {
case 1: so = SeekOrigin.Current; break;
case 2: so = SeekOrigin.End; break;
default: so = SeekOrigin.Begin; break;
}
_sr.Seek(position, so);
}
public int tell() {
ThrowIfClosed();
return _sr.Position;
}
public void truncate() {
ThrowIfClosed();
_sr.Truncate();
}
public void truncate(int size) {
ThrowIfClosed();
_sr.Truncate(size);
}
private void ThrowIfClosed() {
if (closed) {
throw PythonOps.ValueError("I/O operation on closed file");
}
}
#region IEnumerator Members
object IEnumerator.Current {
get { return _enumValue; }
}
bool IEnumerator.MoveNext() {
if (!_sr.EOF) {
_enumValue = readline();
return true;
}
_enumValue = null;
return false;
}
void IEnumerator.Reset() {
throw new NotImplementedException();
}
#endregion
#region IEnumerator<string> Members
string IEnumerator<string>.Current {
get { return _enumValue; }
}
#endregion
#region IDisposable Members
void IDisposable.Dispose() {
}
#endregion
}
[PythonType, PythonHidden, DontMapIEnumerableToContains]
public class StringO : IEnumerator<string>, IEnumerator {
private StringStream _sr = new StringStream("");
private int _softspace;
private string _enumValue;
internal StringO() {
}
public object __iter__() {
return this;
}
public void close() {
if (_sr != null) { _sr = null; }
}
public bool closed {
get {
return _sr == null;
}
}
public void flush() {
}
public string getvalue() {
ThrowIfClosed();
return _sr.Data;
}
public string getvalue(bool usePos) {
ThrowIfClosed();
return _sr.Prefix;
}
public bool isatty() {
ThrowIfClosed();
return false;
}
public string next() {
ThrowIfClosed();
if (_sr.EOF) {
throw PythonOps.StopIteration();
}
return readline();
}
public string read() {
ThrowIfClosed();
return _sr.ReadToEnd();
}
public string read(int i) {
ThrowIfClosed();
return (i < 0) ? _sr.ReadToEnd() : _sr.Read(i);
}
public string readline() {
ThrowIfClosed();
return _sr.ReadLine(-1);
}
public string readline(int size) {
ThrowIfClosed();
return _sr.ReadLine(size);
}
public List readlines() {
ThrowIfClosed();
List list = PythonOps.MakeList();
while (!_sr.EOF) {
list.AddNoLock(readline());
}
return list;
}
public List readlines(int size) {
ThrowIfClosed();
List list = PythonOps.MakeList();
while (!_sr.EOF) {
string line = readline();
list.AddNoLock(line);
if (line.Length >= size) break;
size -= line.Length;
}
return list;
}
public void reset() {
ThrowIfClosed();
_sr.Reset();
}
public void seek(int position) {
seek(position, 0);
}
public void seek(int offset, int origin) {
ThrowIfClosed();
SeekOrigin so;
switch (origin) {
case 1: so = SeekOrigin.Current; break;
case 2: so = SeekOrigin.End; break;
default: so = SeekOrigin.Begin; break;
}
_sr.Seek(offset, so);
}
public int softspace {
get { return _softspace; }
set { _softspace = value; }
}
public int tell() {
ThrowIfClosed();
return _sr.Position;
}
public void truncate() {
ThrowIfClosed();
_sr.Truncate();
}
public void truncate(int size) {
ThrowIfClosed();
_sr.Truncate(size);
}
public void write(string s) {
if (s == null) {
throw PythonOps.TypeError("write argument must be a string or read-only character buffer, not None");
}
ThrowIfClosed();
_sr.Write(s);
}
public void write([NotNull]PythonBuffer buffer) {
_sr.Write(buffer.ToString());
}
public void writelines(object o) {
IEnumerator e = PythonOps.GetEnumerator(o);
while (e.MoveNext()) {
string s = e.Current as string;
if (s == null) {
throw PythonOps.TypeError("string expected");
}
write(s);
}
}
private void ThrowIfClosed() {
if (closed) {
throw PythonOps.ValueError("I/O operation on closed file");
}
}
#region IEnumerator Members
object IEnumerator.Current {
get { return _enumValue; }
}
bool IEnumerator.MoveNext() {
if (!_sr.EOF) {
_enumValue = readline();
return true;
}
_enumValue = null;
return false;
}
void IEnumerator.Reset() {
throw new NotImplementedException();
}
#endregion
#region IEnumerator<string> Members
string IEnumerator<string>.Current {
get { return _enumValue; }
}
#endregion
#region IDisposable Members
void IDisposable.Dispose() {
}
#endregion
}
public static object StringIO() {
return new StringO();
}
public static object StringIO(string data) {
return new StringI(data);
}
}
}