/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreemnets. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package opennlp.tools.tokenize;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import opennlp.tools.util.Span;
import opennlp.tools.util.StringUtil;
/**
* Performs tokenization using character classes.
*/
public class SimpleTokenizer extends AbstractTokenizer {
public static final SimpleTokenizer INSTANCE;
static {
INSTANCE = new SimpleTokenizer();
}
/**
* @deprecated Use INSTANCE field instead to obtain an instance, constructor
* will be made private in the future.
*/
@Deprecated
public SimpleTokenizer() {
}
public Span[] tokenizePos(String s) {
CharacterEnum charType = CharacterEnum.WHITESPACE;
CharacterEnum state = charType;
List<Span> tokens = new ArrayList<Span>();
int sl = s.length();
int start = -1;
char pc = 0;
for (int ci = 0; ci < sl; ci++) {
char c = s.charAt(ci);
if (StringUtil.isWhitespace(c)) {
charType = CharacterEnum.WHITESPACE;
}
else if (Character.isLetter(c)) {
charType = CharacterEnum.ALPHABETIC;
}
else if (Character.isDigit(c)) {
charType = CharacterEnum.NUMERIC;
}
else {
charType = CharacterEnum.OTHER;
}
if (state == CharacterEnum.WHITESPACE) {
if (charType != CharacterEnum.WHITESPACE) {
start = ci;
}
}
else {
if (charType != state || charType == CharacterEnum.OTHER && c != pc) {
tokens.add(new Span(start, ci));
start = ci;
}
}
state = charType;
pc = c;
}
if (charType != CharacterEnum.WHITESPACE) {
tokens.add(new Span(start, sl));
}
return tokens.toArray(new Span[tokens.size()]);
}
/**
*
* @param args
*
* @throws IOException
*/
@Deprecated
public static void main(String[] args) throws IOException {
if (args.length != 0) {
System.err.println("Usage: java opennlp.tools.tokenize.SimpleTokenizer < sentences");
System.exit(1);
}
opennlp.tools.tokenize.Tokenizer tokenizer = new SimpleTokenizer();
java.io.BufferedReader inReader = new java.io.BufferedReader(new java.io.InputStreamReader(System.in));
for (String line = inReader.readLine(); line != null; line = inReader.readLine()) {
if (line.equals("")) {
System.out.println();
}
else {
String[] tokens = tokenizer.tokenize(line);
if (tokens.length > 0) {
System.out.print(tokens[0]);
}
for (int ti=1,tn=tokens.length;ti<tn;ti++) {
System.out.print(" "+tokens[ti]);
}
System.out.println();
}
}
}
}
class CharacterEnum {
static final CharacterEnum WHITESPACE = new CharacterEnum("whitespace");
static final CharacterEnum ALPHABETIC = new CharacterEnum("alphabetic");
static final CharacterEnum NUMERIC = new CharacterEnum("numeric");
static final CharacterEnum OTHER = new CharacterEnum("other");
private String name;
private CharacterEnum(String name) {
this.name = name;
}
@Override
public String toString() {
return name;
}
}