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package eu.dnetlib.pace.common;
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import java.text.Normalizer;
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import java.util.Collection;
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import java.util.List;
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import java.util.Set;
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import java.util.StringTokenizer;
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import org.apache.commons.io.IOUtils;
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import org.apache.commons.lang.StringUtils;
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import com.google.common.base.Joiner;
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import com.google.common.collect.Iterables;
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import com.google.common.collect.Lists;
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import com.google.common.collect.Sets;
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import eu.dnetlib.pace.clustering.NGramUtils;
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import eu.dnetlib.pace.model.Field;
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import eu.dnetlib.pace.model.FieldList;
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import eu.dnetlib.pace.model.FieldListImpl;
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/**
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* Set of common functions
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*
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* @author claudio
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*
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*/
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public abstract class AbstractPaceFunctions {
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protected static Set<String> stopwords = loadFromClasspath("/eu/dnetlib/pace/config/stopwords_en.txt");
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protected static Set<String> ngramBlacklist = loadFromClasspath("/eu/dnetlib/pace/config/ngram_blacklist.txt");
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private static final String alpha = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 ";
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private static final String aliases_from = "⁰¹²³⁴⁵⁶⁷⁸⁹⁺⁻⁼⁽⁾ⁿ₀₁₂₃₄₅₆₇₈₉₊₋₌₍₎";
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private static final String aliases_to = "0123456789+-=()n0123456789+-=()";
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protected final static FieldList EMPTY_FIELD = new FieldListImpl();
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protected String concat(final List<String> l) {
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return Joiner.on(" ").skipNulls().join(l);
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}
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protected String cleanup(final String s) {
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final String s1 = nfd(s);
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final String s2 = fixAliases(s1);
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final String s3 = s2.replaceAll("–", " ");
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final String s4 = s3.replaceAll("&", " ");
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final String s5 = s4.replaceAll("−", " ");
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final String s6 = s5.replaceAll("([0-9]+)", " $1 ");
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final String s7 = s6.replaceAll("[^\\p{ASCII}]|\\p{Punct}", " ");
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final String s8 = s7.replaceAll("\\n", " ");
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final String s9 = s8.replaceAll("(?m)\\s+", " ");
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final String s10 = s9.trim();
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return s10;
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}
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protected String finalCleanup(final String s) {
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return s.toLowerCase();
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}
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protected boolean checkNumbers(final String a, final String b) {
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final String numbersA = getNumbers(a);
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final String numbersB = getNumbers(b);
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final String romansA = getRomans(a);
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final String romansB = getRomans(b);
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return !numbersA.equals(numbersB) || !romansA.equals(romansB);
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}
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protected String getRomans(final String s) {
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final StringBuilder sb = new StringBuilder();
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for (final String t : s.split(" ")) {
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sb.append(isRoman(t) ? t : "");
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}
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return sb.toString();
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}
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protected boolean isRoman(final String s) {
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return s.replaceAll("^M{0,4}(CM|CD|D?C{0,3})(XC|XL|L?X{0,3})(IX|IV|V?I{0,3})$", "qwertyuiop").equals("qwertyuiop");
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}
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protected String getNumbers(final String s) {
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return s.replaceAll("\\D", "");
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}
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protected String fixAliases(final String s) {
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final StringBuilder sb = new StringBuilder();
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for (final char ch : Lists.charactersOf(s)) {
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final int i = StringUtils.indexOf(aliases_from, ch);
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sb.append(i >= 0 ? aliases_to.charAt(i) : ch);
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}
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return sb.toString();
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}
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protected String removeSymbols(final String s) {
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final StringBuilder sb = new StringBuilder();
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for (final char ch : Lists.charactersOf(s)) {
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sb.append(StringUtils.contains(alpha, ch) ? ch : " ");
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}
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return sb.toString().replaceAll("\\s+", " ");
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}
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protected String getFirstValue(final Field values) {
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return (values != null) && !Iterables.isEmpty(values) ? Iterables.getFirst(values, EMPTY_FIELD).stringValue() : null;
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}
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protected boolean notNull(final String s) {
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return s != null;
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}
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// ///////////////////////
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protected String normalize(final String s) {
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return nfd(s).toLowerCase().replaceAll("(\\W|\\p{InCombiningDiacriticalMarks}|\\p{Punct}|\\d|\\n)+", " ").trim();
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}
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private String nfd(final String s) {
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return Normalizer.normalize(s, Normalizer.Form.NFD);
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}
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protected String filterStopWords(final String s, final Set<String> stopwords) {
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final StringTokenizer st = new StringTokenizer(s);
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final StringBuilder sb = new StringBuilder();
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while (st.hasMoreTokens()) {
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final String token = st.nextToken();
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if (!stopwords.contains(token)) {
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sb.append(token);
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sb.append(" ");
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}
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}
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return sb.toString().trim();
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}
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protected Collection<String> filterBlacklisted(final Collection<String> set, final Set<String> ngramBlacklist) {
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final Set<String> newset = Sets.newLinkedHashSet();
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for (final String s : set) {
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if (!ngramBlacklist.contains(s)) {
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newset.add(s);
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}
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}
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return newset;
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}
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// ////////////////////
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public static Set<String> loadFromClasspath(final String classpath) {
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final Set<String> h = Sets.newHashSet();
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try {
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for (final String s : IOUtils.readLines(NGramUtils.class.getResourceAsStream(classpath))) {
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h.add(s);
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}
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} catch (final Throwable e) {
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return Sets.newHashSet();
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}
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return h;
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}
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}
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