292 lines
6.3 KiB
C#
292 lines
6.3 KiB
C#
//
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// System.IO.TextReader
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//
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// Authors:
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// Marcin Szczepanski (marcins@zipworld.com.au)
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// Miguel de Icaza (miguel@gnome.org)
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// Marek Safar (marek.safar@gmail.com)
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//
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// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
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// Copyright 2011 Xamarin Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Runtime.InteropServices;
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#if NET_4_5
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using System.Threading.Tasks;
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#endif
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namespace System.IO {
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[Serializable]
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[ComVisible (true)]
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#if NET_2_1
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public abstract class TextReader : IDisposable {
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#else
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public abstract class TextReader : MarshalByRefObject, IDisposable {
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#endif
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sealed class NullTextReader : TextReader
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{
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public override string ReadLine ()
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{
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return null;
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}
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public override string ReadToEnd ()
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{
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return String.Empty;
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}
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}
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public static readonly TextReader Null = new NullTextReader ();
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protected TextReader()
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{
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}
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public virtual void Close()
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{
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Dispose(true);
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}
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public void Dispose ()
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{
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Dispose(true);
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}
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protected virtual void Dispose (bool disposing)
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{
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if (disposing){
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// If we are explicitly disposed, we can avoid finalization.
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GC.SuppressFinalize (this);
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}
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return;
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}
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public virtual int Peek()
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{
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return -1;
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}
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public virtual int Read()
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{
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return -1;
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}
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public virtual int Read ([In, Out] char[] buffer, int index, int count)
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{
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int c, i;
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for (i = 0; i < count; i++) {
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if ((c = Read ()) == -1)
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return i;
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buffer [index + i] = (char)c;
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}
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return i;
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}
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public virtual int ReadBlock ([In, Out] char [] buffer, int index, int count)
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{
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int total_read_count = 0;
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int current_read_count;
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do {
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current_read_count = Read (buffer, index, count);
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index += current_read_count;
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total_read_count += current_read_count;
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count -= current_read_count;
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} while (current_read_count != 0 && count > 0);
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return total_read_count;
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}
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public virtual string ReadLine ()
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{
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var result = new System.Text.StringBuilder ();
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int c;
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while ((c = Read ()) != -1){
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// check simple character line ending
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if (c == '\n')
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break;
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if (c == '\r') {
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if (Peek () == '\n')
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Read ();
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break;
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}
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result.Append ((char) c);
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}
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if (c == -1 && result.Length == 0)
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return null;
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return result.ToString ();
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}
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public virtual string ReadToEnd ()
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{
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var result = new System.Text.StringBuilder ();
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int c;
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while ((c = Read ()) != -1)
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result.Append ((char) c);
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return result.ToString ();
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}
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public static TextReader Synchronized (TextReader reader)
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{
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if (reader == null)
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throw new ArgumentNullException ("reader is null");
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if (reader is SynchronizedReader)
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return reader;
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return new SynchronizedReader (reader);
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}
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#if NET_4_5
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//
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// Use tuple to pack the arguments because it's faster than
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// setting up anonymous method container with an instance delegate
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//
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public virtual Task<int> ReadAsync (char[] buffer, int index, int count)
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{
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return Task.Factory.StartNew (l => {
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var t = (Tuple<TextReader, char[], int, int>) l;
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return t.Item1.Read (t.Item2, t.Item3, t.Item4);
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}, Tuple.Create (this, buffer, index, count));
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}
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public virtual Task<int> ReadBlockAsync (char[] buffer, int index, int count)
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{
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return Task.Factory.StartNew (l => {
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var t = (Tuple<TextReader, char[], int, int>) l;
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return t.Item1.ReadBlock (t.Item2, t.Item3, t.Item4);
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}, Tuple.Create (this, buffer, index, count));
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}
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public virtual Task<string> ReadLineAsync ()
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{
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return Task.Factory.StartNew (l => ((TextReader) l).ReadLine (), this);
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}
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public virtual Task<string> ReadToEndAsync ()
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{
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return Task.Factory.StartNew (l => ((TextReader) l).ReadToEnd (), this);
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}
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#endif
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}
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//
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// Synchronized Reader implementation, used internally.
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//
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[Serializable]
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sealed class SynchronizedReader : TextReader
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{
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readonly TextReader reader;
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public SynchronizedReader (TextReader reader)
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{
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this.reader = reader;
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}
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public override void Close ()
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{
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lock (this){
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reader.Close ();
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}
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}
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public override int Peek ()
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{
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lock (this){
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return reader.Peek ();
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}
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}
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public override int ReadBlock (char [] buffer, int index, int count)
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{
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lock (this){
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return reader.ReadBlock (buffer, index, count);
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}
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}
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public override string ReadLine ()
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{
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lock (this){
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return reader.ReadLine ();
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}
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}
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public override string ReadToEnd ()
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{
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lock (this){
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return reader.ReadToEnd ();
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}
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}
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public override int Read ()
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{
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lock (this){
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return reader.Read ();
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}
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}
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public override int Read (char [] buffer, int index, int count)
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{
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lock (this){
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return reader.Read (buffer, index, count);
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}
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}
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#if NET_4_5
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public override Task<int> ReadAsync (char[] buffer, int index, int count)
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{
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lock (this) {
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return reader.ReadAsync (buffer, index, count);
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}
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}
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public override Task<int> ReadBlockAsync (char[] buffer, int index, int count)
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{
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lock (this) {
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return reader.ReadBlockAsync (buffer, index, count);
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}
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}
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public override Task<string> ReadLineAsync ()
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{
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lock (this) {
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return reader.ReadLineAsync ();
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}
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}
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public override Task<string> ReadToEndAsync ()
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{
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lock (this) {
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return reader.ReadToEndAsync ();
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}
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}
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#endif
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}
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}
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