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
33namespace 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