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/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / IO / StringReader.cs / 1 / StringReader.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================ ** ** Class: StringReader ** ** Purpose: For reading text from strings ** ** ===========================================================*/ using System; using System.Runtime.InteropServices; namespace System.IO { // This class implements a text reader that reads from a string. // [Serializable()] [System.Runtime.InteropServices.ComVisible(true)] public class StringReader : TextReader { private String _s; private int _pos; private int _length; public StringReader(String s) { if (s == null) throw new ArgumentNullException("s"); _s = s; _length = s == null? 0: s.Length; } // Closes this StringReader. Following a call to this method, the String // Reader will throw an ObjectDisposedException. public override void Close() { Dispose(true); } protected override void Dispose(bool disposing) { _s = null; _pos = 0; _length = 0; base.Dispose(disposing); } // Returns the next available character without actually reading it from // the underlying string. The current position of the StringReader is not // changed by this operation. The returned value is -1 if no further // characters are available. // public override int Peek() { if (_s == null) __Error.ReaderClosed(); if (_pos == _length) return -1; return _s[_pos]; } // Reads the next character from the underlying string. The returned value // is -1 if no further characters are available. // public override int Read() { if (_s == null) __Error.ReaderClosed(); if (_pos == _length) return -1; return _s[_pos++]; } // Reads a block of characters. This method will read up to count // characters from this 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 is reached. // public override int Read([In, Out] char[] buffer, int index, int count) { if (buffer==null) throw new ArgumentNullException("buffer", Environment.GetResourceString("ArgumentNull_Buffer")); if (index < 0) throw new ArgumentOutOfRangeException("index", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if (count < 0) throw new ArgumentOutOfRangeException("count", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if (buffer.Length - index < count) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen")); if (_s == null) __Error.ReaderClosed(); int n = _length - _pos; if (n > 0) { if (n > count) n = count; _s.CopyTo(_pos, buffer, index, n); _pos += n; } return n; } public override String ReadToEnd() { if (_s == null) __Error.ReaderClosed(); String s; if (_pos==0) s = _s; else s = _s.Substring(_pos, _length - _pos); _pos = _length; return s; } // Reads a line. 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. The resulting string does not // contain the terminating carriage return and/or line feed. The returned // value is null if the end of the underlying string has been reached. // public override String ReadLine() { if (_s == null) __Error.ReaderClosed(); int i = _pos; while (i < _length) { char ch = _s[i]; if (ch == '\r' || ch == '\n') { String result = _s.Substring(_pos, i - _pos); _pos = i + 1; if (ch == '\r' && _pos < _length && _s[_pos] == '\n') _pos++; return result; } i++; } if (i > _pos) { String result = _s.Substring(_pos, i - _pos); _pos = i; return result; } return null; } } }
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