source: trunk/Include/Classes/System/IO/StringReader.ab@ 435

'Classes/System/IO/StringReader.ab

Namespace System
Namespace IO

/*
@brief Stringから読み込みを行うTextReaderの実装。
@date 2008/02/26
@auther Egtra
*/
Class StringReader
    Inherits TextReader
Public
    /*
    @brief コンストラクタ
    @date 2008/02/26
    @auther Egtra
    @param str 読み取る基となる文字列。
    @exception ArgumentNullException strがNothingのとき。
    */
    Sub StringReader(str As String)
        If ActiveBasic.IsNothing(str) Then
            Throw New ArgumentNullException("str")
        End If
        s = str
        i = 0
    End Sub

    /*
    @date 2008/02/26
    @auther Egtra
    */
    Override Function Peek() As Long
        If i = s.Length Then
            Peek = -1
        Else
            Peek = s[i]
        End If
    End Function

    /*
    @date 2008/02/26
    @auther Egtra
    */
    Override Function Read() As Long
        If i = s.Length Then
            Read = -1
        Else
            Read = s[i]
            i++
        End If
    End Function

    /*
    @date 2008/02/26
    @auther Egtra
    */
    Override Function ReadToEnd() As String
        ReadToEnd = s.Substring(i)
        i = s.Length
    End Function

Protected
    /*
    @date 2008/02/26
    @auther Egtra
    */
    Override Sub Dispose(disposing As Boolean)
        s = Nothing
        i = 0
    End Sub

    /*
    @date 2008/02/26
    @auther Egtra
    */
    Override Function ReadImpl(buffer As *StrChar, index As Long, count As Long) As Long
        ReadImpl = Math.Min(count, s.Length - i)
        ActiveBasic.Strings.ChrCopy(VarPtr(buffer[index]) As *StrChar, (StrPtr(s) + i * SizeOf (StrChar)) As *StrChar, ReadImpl As SIZE_T) 'ToDo: ポインタに対する+演算
    End Function

Private
    s As String
    i As Long
End Class

End Namespace
End Namespace