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package cgeo.geocaching.utils;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.tuple.Pair;
import android.text.Spanned;
import android.text.style.ImageSpan;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
public class HtmlUtils {
/**
* 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.
*
* @param html
* @return
*/
public static String extractText(CharSequence html) {
String result = html.toString();
// recognize images in textview HTML contents
if (html instanceof Spanned) {
Spanned text = (Spanned) html;
Object[] styles = text.getSpans(0, text.length(), Object.class);
ArrayList<Pair<Integer, Integer>> removals = new ArrayList<Pair<Integer, Integer>>();
for (Object style : styles) {
if (style instanceof ImageSpan) {
int start = text.getSpanStart(style);
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(Pair<Integer, Integer> lhs, Pair<Integer, Integer> rhs) {
return rhs.getRight().compareTo(lhs.getRight());
}
});
result = text.toString();
for (Pair<Integer, Integer> removal : removals) {
result = result.substring(0, removal.getLeft()) + result.substring(removal.getRight());
}
}
// some line breaks are still in the text, source is unknown
return StringUtils.replace(result, "<br />", "\n").trim();
}
/**
* Convert any non-Latin characters into their HTML escaped equivalents
*
* @param input
* String
* @return output String
*/
public static String convertNonLatinCharactersToHTML(final String input) {
final int inputLen = input.length();
final StringBuilder output = new StringBuilder();
for (int i = 0; i < inputLen; i++) {
char c = input.charAt(i);
if (c > 300) {
output.append("&#");
output.append(Integer.toString(c));
output.append(';');
} else {
output.append(c);
}
}
return output.toString();
}
}
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