com.clearnlp.morphology.MPLib Maven / Gradle / Ivy

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/**
 * Copyright (c) 2009/09-2012/08, Regents of the University of Colorado
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 * 2. 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.
 * 
 * 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.
 */
/**
 * Copyright 2012/09-2013/04, 2013/11-Present, University of Massachusetts Amherst
 * Copyright 2013/05-2013/10, IPSoft Inc.
 * 
 * Licensed 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 com.clearnlp.morphology;

import java.util.regex.Pattern;


import com.clearnlp.pattern.PTLink;
import com.clearnlp.pattern.PTNumber;
import com.clearnlp.pattern.PTPunct;

/**
 * Morphology library.
 * @since 1.0.0
 * @author Jinho D. Choi ({@code [email protected]})
 */
public class MPLib
{
	static final public String META_URL = "#url#";
	
	static final public Pattern ALPHA_CHAR = Pattern.compile("\\p{Alpha}");
	static final public Pattern ALNUM_CHAR = Pattern.compile("\\p{Alnum}");
	static public boolean isAlpha(String form)
	{
		return ALPHA_CHAR.matcher(form).find();
	}
	
	static public boolean isAlnum(String form)
	{
		return ALNUM_CHAR.matcher(form).find();		
	}

	/**
	 * Returns a normalized form of the specific word-form.
	 * @see containsURL
	 * @see PTNumber#collapseDigits(String)
	 * @see PTPunct#collapsePunctuation(String)
	 * @param form the word-form.
	 * @return a normalized form of the specific word-form.
	 */
	static public String simplifyBasic(String form)
	{
		if (PTLink.containsURL(form))	return META_URL;
		
		form = PTNumber.collapseDigits(form);
		form = PTPunct.collapsePunctuation(form);
		
		return form;
	}
	
	static public String getSimplifiedLowercaseWordForm(String form)
	{
		return simplifyBasic(form).toLowerCase();
	}
}