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//
// System.IO.StringReader
//
// Author: Marcin Szczepanski (marcins@zipworld.com.au)
//
// Copyright (C) 2004 Novell (http://www.novell.com)
//
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Globalization;
using System.Runtime.InteropServices;
namespace System.IO {
[Serializable]
#if NET_2_0
[ComVisible (true)]
#endif
public class StringReader : TextReader {
string source;
int nextChar;
int sourceLength;
public StringReader( string s ) {
if (s == null)
throw new ArgumentNullException ("s");
this.source = s;
nextChar = 0;
sourceLength = s.Length;
}
public override void Close ()
{
Dispose (true);
}
protected override void Dispose (bool disposing)
{
source = null;
base.Dispose (disposing);
}
public override int Peek() {
CheckObjectDisposedException ();
if( nextChar >= sourceLength ) {
return -1;
} else {
return (int)source[ nextChar ];
}
}
public override int Read() {
CheckObjectDisposedException ();
if( nextChar >= sourceLength ) {
return -1;
} else {
return (int)source[ nextChar++ ];
}
}
// The method will read up to count characters from the StringReader
// into the buffer character array starting at position index. Returns
// the actual number of characters read, or zero if the end of the string
// has been reached and no characters are read.
public override int Read ([In, Out] char[] buffer, int index, int count)
{
CheckObjectDisposedException ();
if (buffer == null)
throw new ArgumentNullException ("buffer");
if (buffer.Length - index < count)
throw new ArgumentException ();
if (index < 0 || count < 0)
throw new ArgumentOutOfRangeException ();
int charsToRead;
// reordered to avoir possible integer overflow
if (nextChar > sourceLength - count)
charsToRead = sourceLength - nextChar;
else
charsToRead = count;
source.CopyTo (nextChar, buffer, index, charsToRead);
nextChar += charsToRead;
return charsToRead;
}
public override string ReadLine ()
{
// Reads until next \r or \n or \r\n, otherwise return null
// LAMESPEC:
// The Beta 2 SDK help says that the ReadLine method
// returns "The next line from the input stream [...] A
// line is defined as a sequence of characters followed by
// a carriage return (\r), a line feed (\n), or a carriage
// return immediately followed by a line feed (\r\n).
// [...] The returned value is a null reference if the end
// of the input stream has been reached."
//
// HOWEVER, the MS implementation returns the rest of
// the string if no \r and/or \n is found in the string
CheckObjectDisposedException ();
if (nextChar >= source.Length)
return null;
int nextCR = source.IndexOf ('\r', nextChar);
int nextLF = source.IndexOf ('\n', nextChar);
int readTo;
bool consecutive = false;
if (nextCR == -1) {
if (nextLF == -1)
return ReadToEnd ();
readTo = nextLF;
} else if (nextLF == -1) {
readTo = nextCR;
} else {
readTo = (nextCR > nextLF) ? nextLF : nextCR;
consecutive = (nextCR + 1 == nextLF);
}
string nextLine = source.Substring (nextChar, readTo - nextChar);
nextChar = readTo + ((consecutive) ? 2 : 1);
return nextLine;
}
public override string ReadToEnd() {
CheckObjectDisposedException ();
string toEnd = source.Substring( nextChar, sourceLength - nextChar );
nextChar = sourceLength;
return toEnd;
}
private void CheckObjectDisposedException ()
{
if (source == null)
throw new ObjectDisposedException ("StringReader",
Locale.GetText ("Cannot read from a closed StringReader"));
}
}
}
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