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//
// System.IO.StringReader
//
// Author: Marcin Szczepanski (marcins@zipworld.com.au)
//
using System;
namespace System.IO {
[Serializable]
public class StringReader : TextReader {
private string source;
private char[] sourceChars;
private int nextChar;
private int sourceLength;
public StringReader( string s ) {
this.source = s;
nextChar = 0;
sourceLength = s.Length;
sourceChars = s.ToCharArray();
}
public override void Close() {
Dispose( true );
}
protected override void Dispose( bool disposing ) {
return;
}
public override int Peek() {
if( nextChar >= sourceLength ) {
return -1;
} else {
return (int)source[ nextChar ];
}
}
public override int Read() {
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( char[] buffer, int index, int count ) {
if( buffer == null ) {
throw new ArgumentNullException();
} else if( buffer.Length - index < count ) {
throw new ArgumentException();
} else if( index < 0 || count < 0 ) {
throw new ArgumentOutOfRangeException();
}
int charsToRead;
if( nextChar + count > sourceLength ) {
charsToRead = sourceLength - nextChar;
} else {
charsToRead = count;
}
Array.Copy(sourceChars, nextChar, buffer, index, charsToRead );
nextChar += count;
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
if (nextChar == source.Length)
return null;
int nextCR = source.IndexOf( '\r', nextChar );
int nextLF = source.IndexOf( '\n', nextChar );
if( nextCR == -1 && nextLF == -1 ) {
return ReadToEnd();
}
int readTo;
if( nextCR == -1 ) {
readTo = nextLF;
} else {
readTo = nextCR;
}
string nextLine = source.Substring( nextChar, readTo - nextChar );
if( nextLF == nextCR + 1 ) {
nextChar = readTo + 2;
} else {
nextChar = readTo + 1;
}
return nextLine;
}
public override string ReadToEnd() {
string toEnd = source.Substring( nextChar, sourceLength - nextChar );
nextChar = sourceLength;
return toEnd;
}
}
}
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