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RegexToken.d

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00001 /*******************************************************************************
00002 
00003         @file RegexToken.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, December 2005      
00034 
00035         @author         Kris
00036 
00037 
00038 *******************************************************************************/
00039 
00040 module mango.text.RegexToken;
00041 
00042 private import mango.text.Token;
00043 
00044 /*******************************************************************************
00045 
00046 
00047 *******************************************************************************/
00048 
00049 class RegexTokenTemplate(T) : TokenTemplate!(T)
00050 {
00051         private import std.regexp;
00052     
00053         private RegExp regex;
00054 
00055         /***********************************************************************
00056         
00057                 Construct a RegexToken with the provided RegExp.
00058 
00059         ***********************************************************************/
00060 
00061         this (T[] pattern, T[] string = null)
00062         {
00063                 super (string);
00064                 regex = new RegExp (pattern, "");
00065         }
00066 
00067         /***********************************************************************
00068  
00069         
00070         ***********************************************************************/
00071 
00072         override bool next()
00073         {
00074                 do {
00075                    ++peek;
00076 
00077                    // did we find a match?
00078                    if (regex.test (peek [0 .. end - peek]))
00079                       {
00080                       int start = regex.pmatch[0].rm_so;
00081                       int finish = regex.pmatch[0].rm_eo;
00082         
00083                       last = peek + start;
00084                       peek += finish;
00085 
00086                       return found;
00087                       }
00088                    } while (getMore);
00089 
00090                 return hasTail;
00091         }
00092 }
00093 
00094 // convenience alias
00095 alias RegexTokenTemplate!(char) RegexToken;

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