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// Copyright (c) 2001, Dr Martin Porter
// Copyright (c) 2002, Richard Boulton
// Copyright (c) 2015, Cesar Souza
// Copyright (c) 2025, Olly Betts
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// * this list of conditions and the following disclaimer.
// * 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.
// * Neither the name of the copyright holders nor the names of its contributors
// * may be used to endorse or promote products derived from this software
// * without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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 Snowball
{
using System;
using System.IO;
using System.Reflection;
using System.Linq;
/// <summary>
/// Snowball's Stemmer program.
/// </summary>
///
public static class Program
{
private static void usage()
{
Console.WriteLine("Usage: stemwords.exe -l <language> [-i <input file>] [-o <output file>]");
}
/// <summary>
/// Main program entrypoint.
/// </summary>
///
public static void Main(String[] args)
{
string language = null;
string inputName = null;
string outputName = null;
for (int i = 0; i < args.Length; i++)
{
if (args[i] == "-l")
language = args[i + 1];
else if (args[i] == "-i")
inputName = args[i + 1];
else if (args[i] == "-o")
outputName = args[i + 1];
}
if (language == null)
{
usage();
return;
}
Stemmer stemmer =
typeof(Stemmer).Assembly.GetTypes()
.Where(t => t.IsSubclassOf(typeof(Stemmer)) && !t.IsAbstract)
.Where(t => match(t.Name, language))
.Select(t => (Stemmer)Activator.CreateInstance(t)).FirstOrDefault();
if (stemmer == null)
{
Console.WriteLine("Language not found.");
return;
}
Console.WriteLine("Using " + stemmer.GetType());
TextWriter output = System.Console.Out;
if (outputName != null)
output = new StreamWriter(outputName);
TextReader input = System.Console.In;
if (inputName != null)
input = new StreamReader(inputName);
while (true)
{
var line = input.ReadLine();
if (line == null) break;
var o = stemmer.Stem(line);
output.WriteLine(o);
}
output.Flush();
}
private static bool match(string stemmerName, string language)
{
string expectedName = language + "Stemmer";
return stemmerName.StartsWith(expectedName,
StringComparison.CurrentCultureIgnoreCase);
}
}
}
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