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TextReader.d

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00001 /*******************************************************************************
00002 
00003         @file TextReader.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 
00027                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
00028 
00029 
00030         @version        Initial version, March 2004      
00031         @author         Kris
00032 
00033 
00034 *******************************************************************************/
00035 
00036 module mango.io.TextReader;
00037 
00038 private import  mango.io.Token,
00039                 mango.io.Tokenizer,
00040                 mango.io.Exception,
00041                 mango.io.AbstractReader;
00042 
00043 /*******************************************************************************
00044 
00045         Grok readable input from a stream. All input is tokenized from the
00046         associated buffer, and converted as necessary into the destination 
00047         location. A SpaceTokenizer is used by default, but you can choose
00048         an alternative (such as a comma-delimiting tokenizer).
00049 
00050 *******************************************************************************/
00051 
00052 class TextReader : AbstractReader
00053 {
00054         // an individual token
00055         private Token token;
00056 
00057         // internal tokenizer instance
00058         private ITokenizer tokenizer;
00059 
00060         /***********************************************************************
00061         
00062                 Construct a TextReader on the provided buffer, using the
00063                 specified Tokenizer instead of the default one.
00064 
00065         ***********************************************************************/
00066 
00067         this (IBuffer buffer, ITokenizer tokenizer)
00068         {
00069                 super (buffer);
00070                 this.token = new Token;
00071                 this.tokenizer = tokenizer;
00072      
00073                 numeric.int1 = &int1;
00074                 numeric.int8 = 
00075                 numeric.int8u = &int8;
00076                 numeric.int16 =
00077                 numeric.int16u = &int16;
00078                 numeric.int32 = 
00079                 numeric.int32u = &int32;
00080                 numeric.int64 = 
00081                 numeric.int64u = &int64;
00082 
00083                 numeric.float32 = &float32;
00084                 numeric.float64 = &float64;
00085                 numeric.float80 = &float80;
00086         }
00087      
00088         /***********************************************************************
00089         
00090                 Construct a TextReader on the given buffer
00091 
00092         ***********************************************************************/
00093 
00094         this (IBuffer buffer)
00095         {
00096                 this (buffer, Tokenizers.space);
00097         }
00098      
00099         /***********************************************************************
00100                 
00101                 Construct a TextReader upon the buffer associated with the
00102                 given conduit.
00103 
00104         ***********************************************************************/
00105 
00106         this (IConduit conduit)
00107         {
00108                 this (conduit.createBuffer);
00109         }
00110 
00111         /***********************************************************************
00112         
00113         ***********************************************************************/
00114         
00115         override char[] toString()
00116         {
00117                 return "text reader";
00118         }
00119 
00120         /***********************************************************************
00121         
00122                 Internal method to isolate the next token.
00123 
00124         ***********************************************************************/
00125 
00126         private final Token next ()
00127         {
00128                 if (tokenizer.next (buffer, token) && token.getLength > 0)
00129                     return token;    
00130                 throw new TokenException ("unexpected end of input");
00131         }
00132 
00133         /***********************************************************************
00134         
00135         ***********************************************************************/
00136 
00137         void int1 (void* src, uint count)
00138         {     
00139                 while (count)
00140                       {
00141                       * cast(bool*) src = (next.toString == "true");
00142                       ++src;
00143                       --count;
00144                       }
00145         }
00146 
00147         /***********************************************************************
00148         
00149         ***********************************************************************/
00150 
00151         void int8 (void* src, uint count)
00152         {     
00153                 while (count)
00154                       {
00155                       * cast(byte*) src = next.toInt();
00156                       src += byte.sizeof;
00157                       count -= byte.sizeof;
00158                       }
00159         }
00160 
00161         /***********************************************************************
00162         
00163         ***********************************************************************/
00164 
00165         void int16 (void* src, uint count)
00166         {     
00167                 while (count)
00168                       {
00169                       * cast(short*) src = next.toInt();
00170                       src += short.sizeof;
00171                       count -= short.sizeof;
00172                       }
00173         }
00174 
00175         /***********************************************************************
00176         
00177         ***********************************************************************/
00178 
00179         void int32 (void* src, uint count)
00180         {     
00181                 while (count)
00182                       {
00183                       * cast(int*) src = next.toInt();
00184                       src += int.sizeof;
00185                       count -= int.sizeof;
00186                       }
00187         }
00188 
00189         /***********************************************************************
00190         
00191         ***********************************************************************/
00192 
00193         void int64 (void* src, uint count)
00194         {     
00195                 while (count)
00196                       {
00197                       * cast(long*) src = next.toLong();
00198                       src += long.sizeof;
00199                       count -= long.sizeof;
00200                       }
00201         }
00202 
00203         /***********************************************************************
00204         
00205         ***********************************************************************/
00206 
00207         void float32 (void* src, uint count)
00208         {     
00209                 while (count)
00210                       {
00211                       * cast(float*) src = next.toReal();
00212                       src += float.sizeof;
00213                       count -= float.sizeof;
00214                       }
00215         }
00216 
00217         /***********************************************************************
00218         
00219         ***********************************************************************/
00220 
00221         void float64 (void* src, uint count)
00222         {     
00223                 while (count)
00224                       {
00225                       * cast(double*) src = next.toReal();
00226                       src += double.sizeof;
00227                       count -= double.sizeof;
00228                       }
00229         }
00230 
00231         /***********************************************************************
00232         
00233         ***********************************************************************/
00234 
00235         void float80 (void* src, uint count)
00236         {     
00237                 while (count)
00238                       {
00239                       * cast(real*) src = next.toReal();
00240                       src += real.sizeof;
00241                       count -= real.sizeof;
00242                       }
00243         }
00244 
00245         /***********************************************************************
00246         
00247         ***********************************************************************/
00248 
00249         override IReader get (inout char[] x) 
00250         { 
00251                 // dup the input string, to avoid surprises
00252                 x = next.toString (false);
00253                 return this;
00254         }
00255 
00256         /***********************************************************************
00257         
00258                 @todo - Tokenizer needs to handle wchar[] before this will
00259                         operate correctly
00260 
00261         ***********************************************************************/
00262 
00263         override IReader get (inout wchar[] x) 
00264         { 
00265                 assert (0);
00266                 return this;
00267         }
00268 
00269         /***********************************************************************
00270         
00271                 @todo - Tokenizer needs to handle dchar[] before this will
00272                         operate correctly
00273 
00274         ***********************************************************************/
00275 
00276         override IReader get (inout dchar[] x) 
00277         { 
00278                 assert (0);
00279                 return this;
00280         }
00281 }

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