Home | History | Annotate | Download | only in Antlr3.Runtime.Test 
      1 /*
      2  * [The "BSD licence"]
      3  * Copyright (c) 2005-2008 Terence Parr
      4  * All rights reserved.
      5  *
      6  * Conversion to C#:
      7  * Copyright (c) 2008-2009 Sam Harwell, Pixel Mine, Inc.
      8  * All rights reserved.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. The name of the author may not be used to endorse or promote products
     19  *    derived from this software without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 namespace Antlr3.Runtime.Test
     34 {
     35     using System;
     36     using Antlr.Runtime;
     37     using Antlr.Runtime.Tree;
     38     using Microsoft.VisualStudio.TestTools.UnitTesting;
     39     using System.Text;
     40 
     41     [TestClass]
     42     public class TestFastLexer
     43     {
     44         [TestMethod]
     45         public void TestBasicFastLexer()
     46         {
     47             string inputElement = "x-2356*Abte+32+eno/6623+y";
     48             StringBuilder builder = new StringBuilder( inputElement, 1000000 * inputElement.Length );
     49             for ( int i = 0; i < 999999; i++ )
     50                 builder.Append( inputElement );
     51 
     52             string text = builder.ToString();
     53             int iterations = 5;
     54             // warmup
     55             IterateFast( text, iterations );
     56             Iterate( text, iterations );
     57 
     58             var time = Iterate( text, iterations );
     59             var timeFast = IterateFast( text, iterations );
     60 
     61             Console.WriteLine( "Elapsed time (norm): {0} seconds.", time.TotalSeconds );
     62             Console.WriteLine( "Elapsed time (fast): {0} seconds.", timeFast.TotalSeconds );
     63         }
     64 
     65         TimeSpan Iterate( string text, int count )
     66         {
     67             DateTime start = DateTime.Now;
     68 
     69             for ( int i = 0; i < count; i++ )
     70             {
     71                 SimpleExpressionLexer lexer = new SimpleExpressionLexer( new ANTLRStringStream( text ) );
     72                 CommonTokenStream tokens = new CommonTokenStream( lexer );
     73                 tokens.Fill();
     74             }
     75 
     76             return DateTime.Now - start;
     77         }
     78 
     79         TimeSpan IterateFast( string text, int count )
     80         {
     81             DateTime start = DateTime.Now;
     82 
     83             for ( int i = 0; i < count; i++ )
     84             {
     85                 FastSimpleExpressionLexer lexer = new FastSimpleExpressionLexer( new SlimStringStream( text ) );
     86                 FastTokenStream tokens = new FastTokenStream( lexer );
     87                 //FastTokenStream<SlimToken> tokens = new FastTokenStream<SlimToken>( lexer );
     88                 tokens.FillBuffer();
     89             }
     90 
     91             return DateTime.Now - start;
     92         }
     93     }
     94 }
     95