| SentenceAndTokenOffsets.java |
package edu.northwestern.at.morphadorner.examples;
/* Please see the license information at the end of this file. */
import java.io.*;
import java.text.*;
import java.util.*;
import edu.northwestern.at.morphadorner.corpuslinguistics.lexicon.*;
import edu.northwestern.at.morphadorner.corpuslinguistics.postagger.guesser.*;
import edu.northwestern.at.morphadorner.corpuslinguistics.sentencesplitter.*;
import edu.northwestern.at.morphadorner.corpuslinguistics.tokenizer.*;
import edu.northwestern.at.utils.*;
/** SentenceAndTokenOffsets: Display sentence and token offsets in text.
*
* <p>
* Usage:
* </p>
*
* <p>
* <code>
* java -Xmx256m edu.northwestern.at.morphadorner.example.SentenceAndTokenOffsets InputFileName
* </code>
* </p>
*
* <p>
* where "InputFileName" specifies the name of a text file to split
* into sentences and word tokens. The default sentence splitter,
* tokenizer, part of speech guesser, and word and suffix lexicons
* are used.
* </p>
*
* <p>
* Example:
* </p>
*
* <p>
* <code>
* java -Xmx256m edu.northwestern.at.morphadorner.example.AdornAString mytext.txt
* </code>
* </p>
*
* <p>
* The output displays each extracted sentence along with its starting and
* ending offset in the text read from the specified input file.
* For each sentence, a list of the extracted tokens in that sentence
* is displayed along with each token's starting and ending offset
* relative to the start of the sentence text.
* </p>
*/
public class SentenceAndTokenOffsets
{
/** Main program.
*
* @param args Command line arguments.
*/
public static void main( String[] args )
{
try
{
if ( args.length > 0 )
{
displayOffsets( args[ 0 ] );
}
else
{
System.err.println(
"Usage: SentenceAndTokenOffsets inputFileName" );
}
}
catch ( Exception e )
{
e.printStackTrace();
}
}
/** Display sentence and token offsets in text.
*
* @param inputFileName Input file name.
*/
public static void displayOffsets( String inputFileName )
throws Exception
{
// Wrap standard output as utf-8.
PrintStream printOut =
new PrintStream
(
new BufferedOutputStream( System.out ) ,
true ,
"utf-8"
);
// Load text to split into
// sentences and tokens.
String sampleText =
FileUtils.readTextFile( inputFileName , "utf-8" );
// Convert all whitespace characters
// into blanks. (Not necessary,
// but makes the display cleaner below.)
sampleText = sampleText.replaceAll( "\\s" , " " );
// Create default sentence splitter.
SentenceSplitter splitter = new DefaultSentenceSplitter();
// Create part of speech guesser
// for use by splitter.
PartOfSpeechGuesser partOfSpeechGuesser =
new DefaultPartOfSpeechGuesser();
// Get default word lexicon for
// use by part of speech guesser.
Lexicon lexicon = new DefaultWordLexicon();
// Set lexicon into guesser.
partOfSpeechGuesser.setWordLexicon( lexicon );
// Get default suffix lexicon for
// use by part of speech guesser.
Lexicon suffixLexicon = new DefaultSuffixLexicon();
// Set suffix lexicon into guesser.
partOfSpeechGuesser.setSuffixLexicon( suffixLexicon );
// Set guesser into sentence splitter.
splitter.setPartOfSpeechGuesser( partOfSpeechGuesser );
// Create default word tokenizer.
WordTokenizer tokenizer = new DefaultWordTokenizer();
// Split input text into sentences
// and words.
List<List<String>> sentences =
splitter.extractSentences
(
sampleText ,
tokenizer
);
// Get sentence start and end
// offsets in input text.
int[] sentenceOffsets =
splitter.findSentenceOffsets( sampleText , sentences );
// Loop over sentences.
for ( int i = 0 ; i < sentences.size() ; i++ )
{
// Get start and end offset of
// sentence text. Note: the
// end is the end + 1 since that
// is what substring wants.
int start = sentenceOffsets[ i ];
int end = sentenceOffsets[ i + 1 ];
// Get sentence text.
String sentence =
sampleText.substring( start , end );
// Display sentence number,
// start, end, and text.
printOut.println(
i + " [" + start + "," + ( end - 1 ) + "]: " + sentence );
// Get word tokens in this sentence.
List words = sentences.get( i );
// Get offsets for each word token
// relative to this sentence.
int[] wordOffsets =
tokenizer.findWordOffsets( sentence , words );
// Loop over word tokens.
for ( int j = 0 ; j < words.size() ; j++ )
{
// Get start and end offset of
// this word token. Note: the
// end is the end + 1 since that
// is what substring wants.
start = wordOffsets[ j ];
end =
wordOffsets[ j ] + words.get( j ).toString().length();
// Display token number,
// start, end, and text.
printOut.println
(
" " + j + " [" + start + "," +
( end - 1 ) + "]: " +
sentence.substring( start , end )
);
}
}
}
}
/*
Copyright (c) 2008, 2013 by Northwestern University.
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Developed by:
Academic and Research Technologies
Northwestern University
http://www.it.northwestern.edu/about/departments/at/
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obtaining a copy of this software and associated documentation
files (the "Software"), to deal with the Software without
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Software is furnished to do so, subject to the following
conditions:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimers.
* Redistributions in binary form must reproduce the above
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disclaimers in the documentation and/or other materials provided
with the distribution.
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*/