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package cgeo.geocaching.utils;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.tuple.Pair;
import android.text.Html;
import android.text.Spanned;
import android.text.style.ImageSpan;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
public final class HtmlUtils {
private HtmlUtils() {
// utility class
}
/**
* Extract the text from a HTML based string. This is similar to what HTML.fromHtml(...) does, but this method also
* removes the embedded images instead of replacing them by a small rectangular representation character.
*
*/
public static String extractText(final CharSequence html) {
if (StringUtils.isBlank(html)) {
return StringUtils.EMPTY;
}
String result = html.toString();
// recognize images in textview HTML contents
if (html instanceof Spanned) {
final Spanned text = (Spanned) html;
final Object[] styles = text.getSpans(0, text.length(), Object.class);
final ArrayList<Pair<Integer, Integer>> removals = new ArrayList<>();
for (final Object style : styles) {
if (style instanceof ImageSpan) {
final int start = text.getSpanStart(style);
final int end = text.getSpanEnd(style);
removals.add(Pair.of(start, end));
}
}
// sort reversed and delete image spans
Collections.sort(removals, new Comparator<Pair<Integer, Integer>>() {
@Override
public int compare(final Pair<Integer, Integer> lhs, final Pair<Integer, Integer> rhs) {
return rhs.getRight().compareTo(lhs.getRight());
}
});
result = text.toString();
for (final Pair<Integer, Integer> removal : removals) {
result = result.substring(0, removal.getLeft()) + result.substring(removal.getRight());
}
}
// now that images are gone, do a normal html to text conversion
return Html.fromHtml(result).toString().trim();
}
public static String removeExtraParagraph(final String htmlIn) {
final String html = StringUtils.trim(htmlIn);
if (StringUtils.startsWith(html, "<p>") && StringUtils.endsWith(html, "</p>")) {
final String paragraph = StringUtils.substring(html, "<p>".length(), html.length() - "</p>".length()).trim();
if (extractText(paragraph).equals(paragraph)) {
return paragraph;
}
}
return html;
}
}
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