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Stdin.d

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00001 /*******************************************************************************
00002 
00003         @file Stdin.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, Feb 2005      
00034         @author         Kris
00035 
00036 
00037 *******************************************************************************/
00038 
00039 module mango.io.Stdin;
00040 
00041 private import  mango.io.Buffer,
00042                 mango.io.Tokenizer,
00043                 mango.io.TextReader,
00044                 mango.io.FileConduit,
00045                 mango.io.ConduitStyle;
00046 
00047 private import  mango.io.model.IReader;
00048 
00049 
00050 /*******************************************************************************
00051 
00052         The ubiquitous console IO support. These are standard FileConduit 
00053         instances, with Reader/Writer wrappers applied appropriately. Note 
00054         that the outputs use FlushBuffer to automatically flush data as it 
00055         is added to the buffer. The basic usage of this module is illustrated 
00056         below:
00057 
00058         @code
00059         char[] msg = "on the console";
00060 
00061         Stdout ("print ") (1) (' ') ("message ") (msg) (CR);
00062         @endcode
00063 
00064         An alternative is to use put() notation like so:
00065 
00066         @code
00067         char[] msg = "on the console";
00068 
00069         Stdout.put ("print ")
00070               .put (1)
00071               .put (' ')
00072               .put ("message ")
00073               .put (msg)
00074               .put (CR);
00075         @endcode
00076 
00077         Another alternative is to use the C++ iostream operators like so:
00078 
00079         @code
00080         char[] msg = "on the console";
00081 
00082         Stdout << "print "
00083                << 1
00084                << ' '
00085                << "message "
00086                << msg
00087                << CR;
00088         @endcode
00089 
00090         Since console idioms are based upon FileConduit, you can use them 
00091         as direct targets for Conduit operations. For example, the code:
00092 
00093         @code
00094           FileConduit fc = new FileConduit ("myfile.txt");
00095           Stdout.conduit.copy (fc);
00096         @endcode
00097 
00098         copies a text file directly to the console. Likewise, you can 
00099         copy console input directly to a FileConduit or a SocketConduit.
00100         Input via Stdin is similar in nature, but uses the Token classes
00101         to isolate and parse each token on an input line:
00102 
00103         @code
00104         Stdout ("please enter your name: ") ();
00105         char[] you;
00106         Stdin (you);           
00107         Stdout ("Hello ") (you) (CR);
00108         @endcode
00109 
00110         Note that Stdin awaits a carriage-return before parsing the input
00111         into the targets. Note also that the Stdout and Stderr are not written 
00112         to be thread-safe. As such you may find that output from two threads 
00113         intersect across each other. If this is a problem you should wrap a 
00114         synchronized block around the offending entity, like so:
00115 
00116         @code
00117         synchronized (Stdout)
00118                       Stdout ("this is ") ("'atomic' ") (" output") (CR);
00119         @endcode
00120         
00121         Alternatively, please consider using the mango.log (Logger) package 
00122         to provide detailed runtime diagnostics from your application. The 
00123         functionality exposed there is likely sufficient for most application 
00124         needs.
00125 
00126         Redirecting the standard IO handles (via a shell) operates as one 
00127         would expect.
00128 
00129 *******************************************************************************/
00130 
00131 class ConsoleReader : TextReader
00132 {
00133         /***********************************************************************
00134         
00135                 Standard output conduit. This is inside the namespace 
00136                 to reduce clutter
00137 
00138         ***********************************************************************/
00139 
00140         FileConduit conduit;
00141 
00142         /***********************************************************************
00143         
00144                 Prohibit instantiation of this class 
00145 
00146         ***********************************************************************/
00147 
00148         private this (int device)
00149         {
00150                 conduit = new FileConduit (new FileDevice (device, ConduitStyle.Access.Read));
00151                 super (conduit, Tokenizers.space);
00152         }
00153 }
00154 
00155 
00156 /*******************************************************************************
00157 
00158         Standard input reader. This is exposed at global scope
00159 
00160 *******************************************************************************/
00161 
00162 static ConsoleReader Stdin;
00163 
00164 static this ()
00165 {
00166         Stdin = new ConsoleReader (0);
00167 }
00168 

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