app/src/main/java/me/zhanghai/android/douya/util/SpanUtils.java

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/*
 * Copyright (c) 2016 Zhang Hai <Dreaming.in.Code.ZH@Gmail.com>
 * All Rights Reserved.
 */

package me.zhanghai.android.douya.util;

import android.support.annotation.NonNull;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.Spanned;
import android.text.util.Linkify;
import android.util.Patterns;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import me.zhanghai.android.douya.ui.UriSpan;

public class SpanUtils {

    /**
     * Modified from {@link Patterns#WEB_URL}, with ftp scheme added and an optional trailing slash.
     */
    @SuppressWarnings("deprecation")
    public static final Pattern WEB_URL_PATTERN = Pattern.compile(
            "((?:(http|https|Http|Https|ftp|Ftp|rtsp|Rtsp):\\/\\/(?:(?:[a-zA-Z0-9\\$\\-\\_\\.\\+\\!\\*\\'\\(\\)"
                    + "\\,\\;\\?\\&\\=]|(?:\\%[a-fA-F0-9]{2})){1,64}(?:\\:(?:[a-zA-Z0-9\\$\\-\\_"
                    + "\\.\\+\\!\\*\\'\\(\\)\\,\\;\\?\\&\\=]|(?:\\%[a-fA-F0-9]{2})){1,25})?\\@)?)?"
                    + "(?:" + Patterns.DOMAIN_NAME + ")"
                    + "(?:\\:\\d{1,5})?)"
                    + "(\\/(?:(?:[" + Patterns.GOOD_IRI_CHAR + "\\;\\/\\?\\:\\@\\&\\=\\#\\~"
                    + "\\-\\.\\+\\!\\*\\'\\(\\)\\,\\_])|(?:\\%[a-fA-F0-9]{2}))*)?"
                    + "(?=\\W|$)");

    private static final String[] WEB_URL_SCHEMES = { "http://", "https://", "ftp://", "rtsp://" };

    /**
     *  Filters out web URL matches that occur after an at-sign (@).  This is
     *  to prevent turning the domain name in an email address into a web link.
     */
    private static final MatchFilter WEB_URL_MATCH_FILTER = new MatchFilter() {
        public final boolean acceptMatch(CharSequence s, int start, int end) {
            if (start == 0) {
                return true;
            }
            if (s.charAt(start - 1) == '@') {
                return false;
            }
            return true;
        }
    };

    /**
     * Modified from {@link Patterns#EMAIL_ADDRESS}, with optional mailto scheme added.
     */
    public static final Pattern EMAIL_PATTERN = Pattern.compile(
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