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Statistical parsing of English sentences

, 13 Dec 2006
Shows how to generate parse trees for English language sentences, using a C# port of OpenNLP, a statistical natural language parsing library.
englishparsing_bin.zip
Lithium.dll
ModelConverter.exe
OpenNLP Tools.chm
OpenNLP.dll
ParseTree.exe
SharpEntropy.dll
ToolsExample.exe
englishparsing_net2_0_bin.zip
ToolsExample.exe
Lithium.dll
ModelConverter.exe
OpenNLP Tools.chm
OpenNLP.dll
ParseTree.exe
SharpEntropy.dll
englishparsing_net2_0_src.zip
Lithium
Collections
Delegates
Enums
Interfaces
IO
Lithium.csproj.vspscc
LithiumControl.bmp
Shapes
UI
Visitors
ModelConverter
App.ico
ModelConverter.csproj.vspscc
ParseTree
App.ico
ParseTree.csproj.vspscc
ToolsExample
App.ico
ToolsExample.csproj.vspscc
OpenNLP
OpenNLP.csproj.vspscc
SharpEntropy.dll
Tools
Chunker
NameFind
Parser
PosTagger
SentenceDetect
Tokenize
Util
englishparsing_src.zip
Lithium.csproj.user
LithiumControl.bmp
App.ico
ModelConverter.csproj.user
OpenNLP.csproj.user
SharpEntropy.dll
vssver.scc
vssver.scc
vssver.scc
vssver.scc
vssver.scc
vssver.scc
vssver.scc
App.ico
ParseTree.csproj.user
App.ico
ToolsExample.csproj.user
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Text;

namespace ToolsExample
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class MainForm : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Button btnParse;
		private System.Windows.Forms.Button btnPOSTag;
		private System.Windows.Forms.Button btnChunk;
		private System.Windows.Forms.Button btnTokenize;
		private System.Windows.Forms.Button btnNameFind;
		private System.Windows.Forms.TextBox txtOut;
		private System.Windows.Forms.Button btnSplit;
		private System.Windows.Forms.TextBox txtIn;
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;

		private string mModelPath;

		private OpenNLP.Tools.SentenceDetect.MaximumEntropySentenceDetector mSentenceDetector;
		private OpenNLP.Tools.Tokenize.EnglishMaximumEntropyTokenizer mTokenizer;
		private OpenNLP.Tools.PosTagger.EnglishMaximumEntropyPosTagger mPosTagger;
		private OpenNLP.Tools.Chunker.EnglishTreebankChunker mChunker;
		private OpenNLP.Tools.Parser.EnglishTreebankParser mParser;
		private OpenNLP.Tools.NameFind.EnglishNameFinder mNameFinder;

		public MainForm()
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();

			mModelPath = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase);
			mModelPath = new System.Uri(mModelPath).LocalPath + @"\Models\";
		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this.btnParse = new System.Windows.Forms.Button();
			this.btnPOSTag = new System.Windows.Forms.Button();
			this.btnChunk = new System.Windows.Forms.Button();
			this.btnTokenize = new System.Windows.Forms.Button();
			this.btnNameFind = new System.Windows.Forms.Button();
			this.txtOut = new System.Windows.Forms.TextBox();
			this.btnSplit = new System.Windows.Forms.Button();
			this.txtIn = new System.Windows.Forms.TextBox();
			this.SuspendLayout();
			// 
			// btnParse
			// 
			this.btnParse.Location = new System.Drawing.Point(360, 104);
			this.btnParse.Name = "btnParse";
			this.btnParse.TabIndex = 21;
			this.btnParse.Text = "Parse";
			this.btnParse.Click += new System.EventHandler(this.btnParse_Click);
			// 
			// btnPOSTag
			// 
			this.btnPOSTag.Location = new System.Drawing.Point(184, 104);
			this.btnPOSTag.Name = "btnPOSTag";
			this.btnPOSTag.TabIndex = 20;
			this.btnPOSTag.Text = "POS tag";
			this.btnPOSTag.Click += new System.EventHandler(this.btnPOSTag_Click);
			// 
			// btnChunk
			// 
			this.btnChunk.Location = new System.Drawing.Point(272, 104);
			this.btnChunk.Name = "btnChunk";
			this.btnChunk.TabIndex = 19;
			this.btnChunk.Text = "Chunk";
			this.btnChunk.Click += new System.EventHandler(this.btnChunk_Click);
			// 
			// btnTokenize
			// 
			this.btnTokenize.Location = new System.Drawing.Point(96, 104);
			this.btnTokenize.Name = "btnTokenize";
			this.btnTokenize.TabIndex = 18;
			this.btnTokenize.Text = "Tokenize";
			this.btnTokenize.Click += new System.EventHandler(this.btnTokenize_Click);
			// 
			// btnNameFind
			// 
			this.btnNameFind.Location = new System.Drawing.Point(448, 104);
			this.btnNameFind.Name = "btnNameFind";
			this.btnNameFind.TabIndex = 16;
			this.btnNameFind.Text = "Find Names";
			this.btnNameFind.Click += new System.EventHandler(this.btnNameFind_Click);
			// 
			// txtOut
			// 
			this.txtOut.Anchor = (((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom) 
				| System.Windows.Forms.AnchorStyles.Left) 
				| System.Windows.Forms.AnchorStyles.Right);
			this.txtOut.Location = new System.Drawing.Point(8, 136);
			this.txtOut.Multiline = true;
			this.txtOut.Name = "txtOut";
			this.txtOut.ScrollBars = System.Windows.Forms.ScrollBars.Both;
			this.txtOut.Size = new System.Drawing.Size(520, 400);
			this.txtOut.TabIndex = 15;
			this.txtOut.Text = "";
			this.txtOut.WordWrap = false;
			// 
			// btnSplit
			// 
			this.btnSplit.Location = new System.Drawing.Point(8, 104);
			this.btnSplit.Name = "btnSplit";
			this.btnSplit.TabIndex = 14;
			this.btnSplit.Text = "Split";
			this.btnSplit.Click += new System.EventHandler(this.btnSplit_Click);
			// 
			// txtIn
			// 
			this.txtIn.Anchor = ((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left) 
				| System.Windows.Forms.AnchorStyles.Right);
			this.txtIn.Location = new System.Drawing.Point(8, 8);
			this.txtIn.Multiline = true;
			this.txtIn.Name = "txtIn";
			this.txtIn.Size = new System.Drawing.Size(520, 88);
			this.txtIn.TabIndex = 13;
			this.txtIn.Text = @"The suburb of Saffron Park lay on the sunset side of London, as red and ragged as a cloud of sunset. It was built of a bright brick throughout; its skyline was fantastic, and even its ground plan was wild. It had been the outburst of a speculative builder, faintly tinged with art, who called its architecture sometimes Elizabethan and sometimes Queen Anne, apparently under the impression that the two sovereigns were identical. It was described with some justice as an artistic colony, though it never in any definable way produced any art.";
			// 
			// MainForm
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(536, 542);
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
																		  this.btnParse,
																		  this.btnPOSTag,
																		  this.btnChunk,
																		  this.btnTokenize,
																		  this.btnNameFind,
																		  this.txtOut,
																		  this.btnSplit,
																		  this.txtIn});
			this.Name = "MainForm";
			this.Text = "OpenNLP Tools Example";
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new MainForm());
		}

		#region Button click events

		private void btnSplit_Click(object sender, System.EventArgs e)
		{		
			string[] sentences = SplitSentences(txtIn.Text);
			
			txtOut.Text = string.Join("\r\n\r\n", sentences);
		}

		private void btnTokenize_Click(object sender, System.EventArgs e)
		{
			StringBuilder output = new StringBuilder();

			string[] sentences = SplitSentences(txtIn.Text);

			foreach(string sentence in sentences)
			{
				string[] tokens = TokenizeSentence(sentence);
				output.Append(string.Join(" | ", tokens)).Append("\r\n\r\n");
			}

			txtOut.Text = output.ToString();
		}

		private void btnPOSTag_Click(object sender, System.EventArgs e)
		{
			StringBuilder output = new StringBuilder();

			string[] sentences = SplitSentences(txtIn.Text);

			foreach(string sentence in sentences)
			{
				string[] tokens = TokenizeSentence(sentence);
				string[] tags = PosTagTokens(tokens);

				for (int currentTag = 0; currentTag < tags.Length; currentTag++)
				{
					output.Append(tokens[currentTag]).Append("/").Append(tags[currentTag]).Append(" ");
				}

				output.Append("\r\n\r\n");
			}

			txtOut.Text = output.ToString();
		}

		private void btnChunk_Click(object sender, System.EventArgs e)
		{
			StringBuilder output = new StringBuilder();

			string[] sentences = SplitSentences(txtIn.Text);

			foreach(string sentence in sentences)
			{
				string[] tokens = TokenizeSentence(sentence);
				string[] tags = PosTagTokens(tokens);

				output.Append(ChunkSentence(tokens, tags)).Append("\r\n");
			}

			txtOut.Text = output.ToString();
		}

		private void btnParse_Click(object sender, System.EventArgs e)
		{
			StringBuilder output = new StringBuilder();

			string[] sentences = SplitSentences(txtIn.Text);

			foreach(string sentence in sentences)
			{
				output.Append(ParseSentence(sentence).Show()).Append("\r\n\r\n");
			}

			txtOut.Text = output.ToString();
		}

		private void btnNameFind_Click(object sender, System.EventArgs e)
		{
			StringBuilder output = new StringBuilder();

			string[] sentences = SplitSentences(txtIn.Text);

			foreach(string sentence in sentences)
			{
                output.Append(FindNames(sentence)).Append("\r\n");
			}

			txtOut.Text = output.ToString();
		}

		#endregion

		#region NLP methods

		private string[] SplitSentences(string paragraph)
		{
			if (mSentenceDetector == null)
			{
				mSentenceDetector = new OpenNLP.Tools.SentenceDetect.EnglishMaximumEntropySentenceDetector(mModelPath + "EnglishSD.nbin");
			}

			return mSentenceDetector.SentenceDetect(paragraph);
		}

		private string[] TokenizeSentence(string sentence)
		{
			if (mTokenizer == null)
			{
				mTokenizer = new OpenNLP.Tools.Tokenize.EnglishMaximumEntropyTokenizer(mModelPath + "EnglishTok.nbin");
			}

			return mTokenizer.Tokenize(sentence);
		}

		private string[] PosTagTokens(string[] tokens)
		{
			if (mPosTagger == null)
			{
				mPosTagger = new OpenNLP.Tools.PosTagger.EnglishMaximumEntropyPosTagger(mModelPath + "EnglishPOS.nbin", mModelPath + @"\Parser\tagdict");
			}

			return mPosTagger.Tag(tokens);
		}

		private string ChunkSentence(string[] tokens, string[] tags)
		{
			if (mChunker == null)
			{
				mChunker = new OpenNLP.Tools.Chunker.EnglishTreebankChunker(mModelPath + "EnglishChunk.nbin");
			}
			
			return mChunker.GetChunks(tokens, tags);
		}

		private OpenNLP.Tools.Parser.Parse ParseSentence(string sentence)
		{
			if (mParser == null)
			{
				mParser = new OpenNLP.Tools.Parser.EnglishTreebankParser(mModelPath, true, false);
			}

			return mParser.DoParse(sentence);
		}

		private string FindNames(string sentence)
		{
			if (mNameFinder == null)
			{
				mNameFinder = new OpenNLP.Tools.NameFind.EnglishNameFinder(mModelPath + "namefind\\");
			}

			string[] models = new string[] {"date", "location", "money", "organization", "percentage", "person", "time"};
			return mNameFinder.GetNames(models, sentence);
		}

		#endregion

		

		
	}
}

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About the Author

Richard Northedge
Web Developer
United Kingdom United Kingdom
Richard Northedge is a senior developer with a UK Microsoft Gold Partner company. He has a postgraduate degree in English Literature, has been programming professionally since 1998 and has been an MCSD since 2000.

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