SimpleStopwordsRemover.cs

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// TraceLab Component Library
// Copyright © 2012-2013 SEMERU
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using TraceLabSDK.Types;

namespace TraceLab.Components.DevelopmentKit.Preprocessors
{
    public static class SimpleStopwordsRemover
    {
        public static TLArtifactsCollection ProcessArtifacts(TLArtifactsCollection listOfArtifacts, int minWordLength, bool removeNumbers)
        {
            TLArtifactsCollection processed = new TLArtifactsCollection();
            foreach (TLArtifact artifact in listOfArtifacts.Values)
            {
                TLArtifact processedArtifact = new TLArtifact(artifact.Id, String.Empty);
                processedArtifact.Text = ProcessText(artifact.Text, minWordLength, removeNumbers);
                processed.Add(processedArtifact);
            }
            return processed;
        }

        public static string ProcessText(string text, int minWordLength, bool removeNumbers)
        {
            StringBuilder builder = new StringBuilder();

            string[] tokens = text.Split();

            foreach (string token in tokens)
            {
                if (token.Length >= minWordLength)
                {
                    if (removeNumbers && IsNumber(token))
                    {
                        continue;
                    }
                    else
                    {
                        builder.AppendFormat("{0} ", token);
                    }
                }
            }

            return builder.ToString().TrimEnd();

        }

        private static bool IsNumber(string text)
        {
            int len = text.Length;
            for (int i = 0; i < len; ++i)
            {
                char c = text[i];
                if (c < '0' || c > '9')
                    return false;
            }
            return true;
        }
    }
}