/* Copyright 2017 Andrew Dawson
 *
 * This file is part of Tusky.
 *
 * Tusky is free software: you can redistribute it and/or modify it under the terms of the GNU
 * General Public License as published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
 * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 * Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with Tusky. If not, see
 * <http://www.gnu.org/licenses/>. */

package com.keylesspalace.tusky;

import android.os.Build;
import android.text.Html;
import android.text.Spanned;

class HtmlUtils {
    private static CharSequence trimTrailingWhitespace(CharSequence s) {
        int i = s.length();
        do {
            i--;
        } while (i >= 0 && Character.isWhitespace(s.charAt(i)));
        return s.subSequence(0, i + 1);
    }

    static Spanned fromHtml(String html) {
        Spanned result;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            result = Html.fromHtml(html, Html.FROM_HTML_MODE_LEGACY);
        } else {
            result = Html.fromHtml(html);
        }
        /* Html.fromHtml returns trailing whitespace if the html ends in a </p> tag, which
         * all status contents do, so it should be trimmed. */
        return (Spanned) trimTrailingWhitespace(result);
    }
}