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Segmenter.java
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Segmenter.java
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/*******************************************************************************
* Copyright (c) 2022 - 2024 Maxprograms.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 1.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/org/documents/epl-v10.html
*
* Contributors:
* Maxprograms - initial API and implementation
*******************************************************************************/
package com.maxprograms.segmenter;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.xml.parsers.ParserConfigurationException;
import org.xml.sax.SAXException;
import com.maxprograms.xml.Catalog;
import com.maxprograms.xml.Document;
import com.maxprograms.xml.Element;
import com.maxprograms.xml.SAXBuilder;
import com.maxprograms.xml.TextNode;
import com.maxprograms.xml.XMLNode;
import com.maxprograms.xml.XMLUtils;
public class Segmenter {
public static final String STARTIGNORE = "@#$%~";
public static final String ENDIGNORE = "~%$#@";
private Element root;
private boolean cascade;
private List<Element> rules;
private Map<String, String> tags;
private int tagId;
public Segmenter(String srxFile, String srcLanguage, Catalog catalog)
throws SAXException, IOException, ParserConfigurationException {
SAXBuilder builder = new SAXBuilder();
builder.setEntityResolver(catalog);
Document doc = builder.build(srxFile);
root = doc.getRootElement();
if (!root.getName().equals("srx")) {
throw new IOException(Messages.getString("Segmenter.1"));
}
if (!root.getAttributeValue("version").equals("2.0")) {
throw new IOException(Messages.getString("Segmenter.2"));
}
tags = new HashMap<>();
cascade = isCascading();
buildRulesList(srcLanguage);
}
public Segmenter(Document doc, String srcLanguage) throws IOException {
root = doc.getRootElement();
if (!root.getName().equals("srx")) {
throw new IOException(Messages.getString("Segmenter.1"));
}
cascade = isCascading();
buildRulesList(srcLanguage);
}
public String[] segmentRawString(String string) {
return segment(string, false);
}
public String[] segment(String string) {
return segment(string, true);
}
private String[] segment(String string, boolean prepare) {
if (string == null || string.isEmpty()) {
return new String[] {};
}
String pureText = prepare ? prepareString(string) : string;
List<String> parts = new ArrayList<>();
for (int pos = 0; pos < pureText.length(); pos++) {
String left = hideTags(pureText.substring(0, pos));
String right = hideTags(pureText.substring(pos));
if (left.isEmpty()) {
continue;
}
for (int i = 0; i < rules.size(); i++) {
Element rule = rules.get(i);
boolean breaks = rule.getAttributeValue("break", "yes").equals("yes");
Element before = rule.getChild("beforebreak");
Element after = rule.getChild("afterbreak");
String beforexp = "";
if (before != null) {
beforexp = before.getText();
}
String afterxp = "";
if (after != null) {
afterxp = after.getText();
}
if (!beforexp.isEmpty() && !afterxp.isEmpty()) {
// match left and right
if (endsWith(left, beforexp) && startsWith(right, afterxp)) {
if (breaks) {
parts.add(pureText.substring(0, pos));
pureText = pureText.substring(pos);
pos = 0;
}
break;
}
} else if (!beforexp.isEmpty()) {
// match left side only
if (endsWith(left, beforexp)) {
if (breaks) {
parts.add(pureText.substring(0, pos));
pureText = pureText.substring(pos);
pos = 0;
}
break;
}
} else {
// match right side only
if (startsWith(right, afterxp)) {
if (breaks) {
parts.add(pureText.substring(0, pos));
pureText = pureText.substring(pos);
pos = 0;
}
break;
}
}
}
}
parts.add(pureText);
String[] result = new String[parts.size()];
for (int i = 0; i < parts.size(); i++) {
result[i] = cleanup(parts.get(i));
}
return result;
}
private String hideTags(String string) {
String result = string;
Set<String> keys = tags.keySet();
Iterator<String> it = keys.iterator();
while (it.hasNext()) {
String key = it.next();
int index = result.indexOf(key);
if (index != -1) {
result = result.substring(0, index) + result.substring(index + 1);
}
}
return result;
}
private static boolean endsWith(String string, String exp) {
Pattern p = Pattern.compile(exp);
String[] parts = p.split(string);
if (parts.length > 0) {
if (!string.endsWith(parts[parts.length - 1])) {
String ends = string
.substring(string.lastIndexOf(parts[parts.length - 1]) + parts[parts.length - 1].length());
Matcher m = p.matcher(ends);
return m.lookingAt();
}
Matcher m = p.matcher(parts[parts.length - 1]);
return m.lookingAt();
}
// split() did not return any part (everything was removed from the returned
// result).
// perhaps the whole text matches
Matcher m = p.matcher(string);
return m.matches();
}
private static boolean startsWith(String string, String exp) {
Pattern p = Pattern.compile(exp);
Matcher m = p.matcher(string);
return m.lookingAt();
}
private String prepareString(String raw) {
String string = raw;
tags = new HashMap<>();
int k = 0;
int start = string.indexOf(STARTIGNORE);
int end = string.indexOf(ENDIGNORE);
while (start != -1 && end != -1) {
if (start > end) {
break;
}
String tag = string.substring(start + STARTIGNORE.length(), end);
string = string.substring(0, start) + (char) ('\uE000' + k) + string.substring(end + ENDIGNORE.length());
tags.put("" + (char) ('\uE000' + k), tag);
k++;
start = string.indexOf(STARTIGNORE);
end = string.indexOf(ENDIGNORE);
}
start = string.indexOf("<mrk ");
end = string.indexOf("</mrk>");
// check nested <mrk>
int e = string.indexOf("<mrk ", string.indexOf('>', start));
while (e != -1 && e < end) {
end = string.indexOf("</mrk>", end + 1);
e = string.indexOf("<mrk ", string.indexOf('>', e + 1));
}
while (start != -1 && end != -1) {
if (start > end) {
break;
}
String tag = string.substring(start, end + 6);
string = string.substring(0, start) + (char) ('\uE000' + k) + string.substring(end + 6);
tags.put("" + (char) ('\uE000' + k), tag);
k++;
start = string.indexOf("<mrk ");
end = string.indexOf("</mrk>");
}
start = string.indexOf("<ph");
end = string.indexOf("</ph>");
while (start != -1 && end != -1) {
if (start > end) {
break;
}
String tag = string.substring(start, end + 5);
string = string.substring(0, start) + (char) ('\uE000' + k) + string.substring(end + 5);
tags.put("" + (char) ('\uE000' + k), tag);
k++;
start = string.indexOf("<ph");
end = string.indexOf("</ph>");
}
StringBuffer buffer = new StringBuffer();
StringBuffer element = new StringBuffer();
int length = string.length();
boolean inElement = false;
for (int i = 0; i < length; i++) {
char c = string.charAt(i);
if (c == '<' && string.indexOf('>', i) != -1) {
inElement = true;
int a = string.indexOf('<', i + 1);
int b = string.indexOf('>', i + 1);
if (a != -1 && a < b) {
inElement = false;
}
if (i < length - 1 && !Character.isLetter(string.charAt(i + 1)) && string.charAt(i + 1) != '/') {
inElement = false;
}
}
if (inElement) {
element.append(c);
} else {
buffer.append(c);
}
if (c == '>' && inElement) {
inElement = false;
tags.put("" + (char) ('\uE000' + k), element.toString());
buffer.append((char) ('\uE000' + k));
element = new StringBuffer();
k++;
}
}
return buffer.toString();
}
private String cleanup(String string) {
String result = string;
Set<String> keys = tags.keySet();
Iterator<String> it = keys.iterator();
while (it.hasNext()) {
String key = it.next();
int index = result.indexOf(key);
if (index != -1) {
result = result.substring(0, index) + tags.get(key) + result.substring(index + 1);
}
}
return result;
}
private void buildRulesList(String srcLanguage) {
List<String> maps = new ArrayList<>();
List<Element> allMaps = root.getChild("body").getChild("maprules").getChildren("languagemap");
Iterator<Element> it = allMaps.iterator();
while (it.hasNext()) {
Element map = it.next();
if (srcLanguage.matches(map.getAttributeValue("languagepattern"))) {
maps.add(map.getAttributeValue("languagerulename"));
if (!cascade) {
break;
}
}
}
rules = new ArrayList<>();
List<Element> languageRules = root.getChild("body").getChild("languagerules").getChildren("languagerule");
it = languageRules.iterator();
while (it.hasNext()) {
Element languagerule = it.next();
String name = languagerule.getAttributeValue("languagerulename");
if (maps.contains(name)) {
List<Element> ruleset = languagerule.getChildren("rule");
Iterator<Element> rit = ruleset.iterator();
while (rit.hasNext()) {
rules.add(rit.next());
}
}
}
}
private boolean isCascading() {
return root.getChild("header").getAttributeValue("cascade").equals("yes");
}
public Element segment(Element source) throws SAXException, IOException, ParserConfigurationException {
tags = new HashMap<>();
tagId = 0;
String pureText = pureText(source);
List<String> parts = new ArrayList<>();
for (int pos = 0; pos < pureText.length(); pos++) {
String left = hideTags(pureText.substring(0, pos));
String right = hideTags(pureText.substring(pos));
if (left.isEmpty()) {
continue;
}
for (int i = 0; i < rules.size(); i++) {
Element rule = rules.get(i);
boolean breaks = rule.getAttributeValue("break", "yes").equals("yes");
Element before = rule.getChild("beforebreak");
Element after = rule.getChild("afterbreak");
String beforexp = "";
if (before != null) {
beforexp = before.getText();
}
String afterxp = "";
if (after != null) {
afterxp = after.getText();
}
if (!beforexp.isEmpty() && !afterxp.isEmpty()) {
// match left and right
if (endsWith(left, beforexp) && startsWith(right, afterxp)) {
if (breaks) {
parts.add(pureText.substring(0, pos));
pureText = pureText.substring(pos);
pos = 0;
}
break;
}
} else if (!beforexp.isEmpty()) {
// match left side only
if (endsWith(left, beforexp)) {
if (breaks) {
parts.add(pureText.substring(0, pos));
pureText = pureText.substring(pos);
pos = 0;
}
break;
}
} else {
// match right side only
if (startsWith(right, afterxp)) {
if (breaks) {
parts.add(pureText.substring(0, pos));
pureText = pureText.substring(pos);
pos = 0;
}
break;
}
}
}
}
parts.add(pureText);
String[] result = new String[parts.size()];
for (int i = 0; i < parts.size(); i++) {
result[i] = cleanup(XMLUtils.cleanText(parts.get(i)));
}
if (result.length == 1) {
// return a <seg-source> with the content of source
Element res = new Element("seg-source");
Element mrk = new Element("mrk");
mrk.setAttribute("mtype", "seg");
mrk.setAttribute("mid", "1");
res.addContent(mrk);
mrk.addContent(source.getContent());
return res;
}
// generate segments
Element res = new Element("seg-source");
SAXBuilder b = new SAXBuilder();
for (int i = 0; i < result.length; i++) {
String seg = "<mrk mtype=\"seg\" mid=\"" + (i + 1) + "\">" + result[i] + "</mrk>";
Document docu = b.build(new ByteArrayInputStream(seg.getBytes(StandardCharsets.UTF_8)));
res.addContent(docu.getRootElement());
}
return res;
}
private String pureText(Element e) {
StringBuilder result = new StringBuilder();
List<XMLNode> nodes = e.getContent();
Iterator<XMLNode> it = nodes.iterator();
while (it.hasNext()) {
XMLNode n = it.next();
if (n.getNodeType() == XMLNode.TEXT_NODE) {
result.append(((TextNode) n).getText());
}
if (n.getNodeType() == XMLNode.ELEMENT_NODE) {
Element tag = (Element) n;
tags.put("" + (char) ('\uE000' + tagId), tag.toString());
result.append((char) ('\uE000' + tagId));
tagId++;
}
}
return result.toString();
}
}