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FlushWriter.d

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00001 /*******************************************************************************
00002 
00003         @file FlushWriter.d
00004         
00005         Copyright (c) 2004 Kris Bell
00006         
00007         This software is provided 'as-is', without any express or implied
00008         warranty. In no event will the authors be held liable for damages
00009         of any kind arising from the use of this software.
00010         
00011         Permission is hereby granted to anyone to use this software for any 
00012         purpose, including commercial applications, and to alter it and/or 
00013         redistribute it freely, subject to the following restrictions:
00014         
00015         1. The origin of this software must not be misrepresented; you must 
00016            not claim that you wrote the original software. If you use this 
00017            software in a product, an acknowledgment within documentation of 
00018            said product would be appreciated but is not required.
00019 
00020         2. Altered source versions must be plainly marked as such, and must 
00021            not be misrepresented as being the original software.
00022 
00023         3. This notice may not be removed or altered from any distribution
00024            of the source.
00025 
00026         4. Derivative works are permitted, but they must carry this notice
00027            in full and credit the original source.
00028 
00029 
00030                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
00031 
00032 
00033         @version        Initial version; March 2004      
00034 
00035         @author         Kris
00036                         
00037 
00038 *******************************************************************************/
00039 
00040 module mango.io.FlushWriter;
00041 
00042 public import  mango.io.DisplayWriter;
00043 
00044 /*******************************************************************************
00045 
00046         Subclass to support automatic flushing. This can be used for 
00047         Stdout, Stderr, and other related conduits.
00048 
00049 *******************************************************************************/
00050 
00051 class FlushWriter : DisplayWriter
00052 {
00053         alias DisplayWriter.put put;
00054 
00055         /***********************************************************************
00056         
00057                 Construct a FlushWriter upon the specified IBuffer
00058 
00059         ***********************************************************************/
00060 
00061         this (IBuffer buffer)
00062         {
00063                 super (buffer);
00064         }
00065 
00066         /***********************************************************************
00067         
00068                 Construct a FlushWriter upon the specified IConduit
00069 
00070         ***********************************************************************/
00071 
00072         this (IConduit conduit)
00073         {
00074                 this (conduit.createBuffer);
00075         }
00076 
00077         /***********************************************************************
00078         
00079                 look for a trailing '\n' ~ flush output if one is present
00080                 
00081         ***********************************************************************/
00082 
00083         IWriter put (char[] s) 
00084         {
00085                 super.put (s);
00086                 if (s.length && s[s.length-1] == '\n')
00087                     flush();
00088                 return this;
00089         }
00090 
00091         /**********************************************************************
00092         
00093                 Intercept the IWritable method to catch newlines, and 
00094                 flush the buffer whenever one is emitted
00095 
00096         ***********************************************************************/
00097 
00098         override IWriter put (IWritable x)
00099         {      
00100                // have superclass handle the IWritable
00101                 super.put (x);
00102 
00103                 // flush output when we see a newline
00104                 if (cast(INewlineWriter) x)
00105                     flush ();
00106 
00107                 return this;
00108         }
00109 }
00110      

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