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/*
* [The "BSD licence"]
* Copyright (c) 2005-2008 Terence Parr
* All rights reserved.
*
* Conversion to C#:
* Copyright (c) 2008-2009 Sam Harwell, Pixel Mine, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
namespace Antlr3.Runtime.Test
{
using System;
using Antlr.Runtime;
using Antlr.Runtime.Tree;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System.Text;
[TestClass]
public class TestFastLexer
{
[TestMethod]
public void TestBasicFastLexer()
{
string inputElement = "x-2356*Abte+32+eno/6623+y";
StringBuilder builder = new StringBuilder( inputElement, 1000000 * inputElement.Length );
for ( int i = 0; i < 999999; i++ )
builder.Append( inputElement );
string text = builder.ToString();
int iterations = 5;
// warmup
IterateFast( text, iterations );
Iterate( text, iterations );
var time = Iterate( text, iterations );
var timeFast = IterateFast( text, iterations );
Console.WriteLine( "Elapsed time (norm): {0} seconds.", time.TotalSeconds );
Console.WriteLine( "Elapsed time (fast): {0} seconds.", timeFast.TotalSeconds );
}
TimeSpan Iterate( string text, int count )
{
DateTime start = DateTime.Now;
for ( int i = 0; i < count; i++ )
{
SimpleExpressionLexer lexer = new SimpleExpressionLexer( new ANTLRStringStream( text ) );
CommonTokenStream tokens = new CommonTokenStream( lexer );
tokens.Fill();
}
return DateTime.Now - start;
}
TimeSpan IterateFast( string text, int count )
{
DateTime start = DateTime.Now;
for ( int i = 0; i < count; i++ )
{
FastSimpleExpressionLexer lexer = new FastSimpleExpressionLexer( new SlimStringStream( text ) );
FastTokenStream tokens = new FastTokenStream( lexer );
//FastTokenStream<SlimToken> tokens = new FastTokenStream<SlimToken>( lexer );
tokens.FillBuffer();
}
return DateTime.Now - start;
}
}
}
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