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Java API for Natural Language Generation
/*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
* License for the specific language governing rights and limitations
* under the License.
*
* The Original Code is "Simplenlg".
*
* The Initial Developer of the Original Code is Ehud Reiter, Albert Gatt and Dave Westwater.
* Portions created by Ehud Reiter, Albert Gatt and Dave Westwater are Copyright (C) 2010-11 The University of Aberdeen. All Rights Reserved.
*
* Contributor(s): Ehud Reiter, Albert Gatt, Dave Wewstwater, Roman Kutlak, Margaret Mitchell.
*/
package simplenlg.format.english;
import java.util.ArrayList;
import java.util.List;
import simplenlg.framework.CoordinatedPhraseElement;
import simplenlg.framework.DocumentCategory;
import simplenlg.framework.DocumentElement;
import simplenlg.framework.ElementCategory;
import simplenlg.framework.ListElement;
import simplenlg.framework.NLGElement;
import simplenlg.framework.NLGModule;
import simplenlg.framework.StringElement;
/**
*
* This processing module adds some simple plain text formatting to the
* SimpleNLG output. This includes the following:
*
* - Adding the document title to the beginning of the text.
* - Adding section titles in the relevant places.
* - Adding appropriate new line breaks for ease-of-reading.
* - Adding list items with ' * '.
* - Adding numbers for enumerated lists (e.g., "1.1 - ", "1.2 - ", etc.)
*
*
*
* @author D. Westwater, University of Aberdeen.
* @version 4.0
*
*/
public class TextFormatter extends NLGModule {
static private NumberedPrefix numberedPrefix = new NumberedPrefix();
@Override
public void initialise() {
// Do nothing
}
@Override
public NLGElement realise(NLGElement element) {
NLGElement realisedComponent = null;
StringBuffer realisation = new StringBuffer();
if (element != null) {
ElementCategory category = element.getCategory();
List components = element.getChildren();
//NB: The order of the if-statements below is important!
// check if this is a canned text first
if (element instanceof StringElement) {
realisation.append(element.getRealisation());
} else if (category instanceof DocumentCategory) {
// && element instanceof DocumentElement
String title = element instanceof DocumentElement ? ((DocumentElement) element)
.getTitle()
: null;
// String title = ((DocumentElement) element).getTitle();
switch ((DocumentCategory) category) {
case DOCUMENT:
appendTitle(realisation, title, 2);
realiseSubComponents(realisation, components);
break;
case SECTION:
appendTitle(realisation, title, 1);
realiseSubComponents(realisation, components);
break;
case LIST:
realiseSubComponents(realisation, components);
break;
case ENUMERATED_LIST:
numberedPrefix.upALevel();
if (title != null) {
realisation.append(title).append('\n');
}
if (null != components && 0 < components.size()) {
realisedComponent = realise(components.get(0));
if (realisedComponent != null) {
realisation.append(realisedComponent.getRealisation());
}
for (int i = 1; i < components.size(); i++) {
if (realisedComponent != null && !realisedComponent.getRealisation().endsWith("\n")) {
realisation.append(' ');
}
if(components.get(i).getParent().getCategory() == DocumentCategory.ENUMERATED_LIST) {
numberedPrefix.increment();
}
realisedComponent = realise(components.get(i));
if (realisedComponent != null) {
realisation.append(realisedComponent.getRealisation());
}
}
}
numberedPrefix.downALevel();
break;
case PARAGRAPH:
if (null != components && 0 < components.size()) {
realisedComponent = realise(components.get(0));
if (realisedComponent != null) {
realisation.append(realisedComponent.getRealisation());
}
for (int i = 1; i < components.size(); i++) {
if (realisedComponent != null) {
realisation.append(' ');
}
realisedComponent = realise(components.get(i));
if (realisedComponent != null) {
realisation.append(realisedComponent.getRealisation());
}
}
}
realisation.append("\n\n");
break;
case SENTENCE:
realisation.append(element.getRealisation());
break;
case LIST_ITEM:
if(element.getParent() != null) {
if(element.getParent().getCategory() == DocumentCategory.LIST) {
realisation.append(" * ");
} else if(element.getParent().getCategory() == DocumentCategory.ENUMERATED_LIST) {
realisation.append(numberedPrefix.getPrefix() + " - ");
}
}
for (NLGElement eachComponent : components) {
realisedComponent = realise(eachComponent);
if (realisedComponent != null) {
realisation.append(realisedComponent
.getRealisation());
if(components.indexOf(eachComponent) < components.size()-1) {
realisation.append(' ');
}
}
}
//finally, append newline
realisation.append("\n");
break;
}
// also need to check if element is a ListElement (items can
// have embedded lists post-orthography) or a coordinate
} else if (element instanceof ListElement || element instanceof CoordinatedPhraseElement) {
for (NLGElement eachComponent : components) {
realisedComponent = realise(eachComponent);
if (realisedComponent != null) {
realisation.append(realisedComponent.getRealisation()).append(' ');
}
}
}
}
return new StringElement(realisation.toString());
}
/**
* realiseSubComponents -- Realises subcomponents iteratively.
* @param realisation -- The current realisation StringBuffer.
* @param components -- The components to realise.
*/
private void realiseSubComponents(StringBuffer realisation,
List components) {
NLGElement realisedComponent;
for (NLGElement eachComponent : components) {
realisedComponent = realise(eachComponent);
if (realisedComponent != null) {
realisation.append(realisedComponent
.getRealisation());
}
}
}
/**
* appendTitle -- Appends document or section title to the realised document.
* @param realisation -- The current realisation StringBuffer.
* @param title -- The title to append.
* @param numberOfLineBreaksAfterTitle -- Number of line breaks to append.
*/
private void appendTitle(StringBuffer realisation, String title, int numberOfLineBreaksAfterTitle) {
if (title != null && !title.isEmpty()) {
realisation.append(title);
for(int i = 0; i < numberOfLineBreaksAfterTitle; i++) {
realisation.append("\n");
}
}
}
@Override
public List realise(List elements) {
List realisedList = new ArrayList();
if (elements != null) {
for (NLGElement eachElement : elements) {
realisedList.add(realise(eachElement));
}
}
return realisedList;
}
}