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Diffstat (limited to '')
| -rw-r--r-- | src/main/java/de/pixart/messenger/utils/IrregularUnicodeBlockDetector.java | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/src/main/java/de/pixart/messenger/utils/IrregularUnicodeBlockDetector.java b/src/main/java/de/pixart/messenger/utils/IrregularUnicodeBlockDetector.java new file mode 100644 index 000000000..df654eeb3 --- /dev/null +++ b/src/main/java/de/pixart/messenger/utils/IrregularUnicodeBlockDetector.java @@ -0,0 +1,160 @@ +/* + * Copyright (c) 2018, Daniel Gultsch All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation and/or + * other materials provided with the distribution. + * + * 3. Neither the name of the copyright holder nor the names of its contributors + * may be used to endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR + * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +package de.pixart.messenger.utils; + +import android.content.Context; +import android.support.annotation.ColorInt; +import android.text.Spannable; +import android.text.SpannableString; +import android.text.SpannableStringBuilder; +import android.text.style.ForegroundColorSpan; +import android.util.LruCache; + +import java.util.ArrayList; +import java.util.Collections; +import java.util.HashMap; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.regex.Matcher; +import java.util.regex.Pattern; + +import de.pixart.messenger.R; +import de.pixart.messenger.ui.util.Color; +import rocks.xmpp.addr.Jid; + +public class IrregularUnicodeBlockDetector { + + private static final Map<Character.UnicodeBlock,Character.UnicodeBlock> NORMALIZATION_MAP; + + static { + Map<Character.UnicodeBlock,Character.UnicodeBlock> temp = new HashMap<>(); + temp.put(Character.UnicodeBlock.LATIN_1_SUPPLEMENT, Character.UnicodeBlock.BASIC_LATIN); + NORMALIZATION_MAP = Collections.unmodifiableMap(temp); + } + + private static Character.UnicodeBlock normalize(Character.UnicodeBlock in) { + if (NORMALIZATION_MAP.containsKey(in)) { + return NORMALIZATION_MAP.get(in); + } else { + return in; + } + } + + private static final LruCache<Jid, Pattern> CACHE = new LruCache<>(100); + + public static Spannable style(Context context, Jid jid) { + return style(jid, Color.get(context, R.attr.color_warning)); + } + + private static Spannable style(Jid jid, @ColorInt int color) { + SpannableStringBuilder builder = new SpannableStringBuilder(); + if (jid.getLocal() != null) { + SpannableString local = new SpannableString(jid.getLocal()); + Matcher matcher = find(jid).matcher(local); + while (matcher.find()) { + if (matcher.start() < matcher.end()) { + local.setSpan(new ForegroundColorSpan(color), matcher.start(), matcher.end(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); + } + } + builder.append(local); + builder.append('@'); + } + if (jid.getDomain() != null) { + builder.append(jid.getDomain()); + } + if (builder.length() != 0 && jid.getResource() != null) { + builder.append('/'); + builder.append(jid.getResource()); + } + return builder; + } + + private static Map<Character.UnicodeBlock, List<String>> map(Jid jid) { + Map<Character.UnicodeBlock, List<String>> map = new HashMap<>(); + String local = jid.getLocal(); + final int length = local.length(); + for (int offset = 0; offset < length; ) { + final int codePoint = local.codePointAt(offset); + Character.UnicodeBlock block = normalize(Character.UnicodeBlock.of(codePoint)); + List<String> codePoints; + if (map.containsKey(block)) { + codePoints = map.get(block); + } else { + codePoints = new ArrayList<>(); + map.put(block, codePoints); + } + codePoints.add(String.copyValueOf(Character.toChars(codePoint))); + offset += Character.charCount(codePoint); + } + return map; + } + + private static Set<String> eliminateFirstAndGetCodePoints(Map<Character.UnicodeBlock, List<String>> map) { + Character.UnicodeBlock block = Character.UnicodeBlock.BASIC_LATIN; + int size = 0; + for (Map.Entry<Character.UnicodeBlock, List<String>> entry : map.entrySet()) { + if (entry.getValue().size() > size) { + size = entry.getValue().size(); + block = entry.getKey(); + } + } + map.remove(block); + Set<String> all = new HashSet<>(); + for (List<String> codePoints : map.values()) { + all.addAll(codePoints); + } + return all; + } + + private static Pattern find(Jid jid) { + synchronized (CACHE) { + Pattern pattern = CACHE.get(jid); + if (pattern != null) { + return pattern; + } + pattern = create(eliminateFirstAndGetCodePoints(map(jid))); + CACHE.put(jid, pattern); + return pattern; + } + } + + private static Pattern create(Set<String> codePoints) { + final StringBuilder pattern = new StringBuilder(); + for (String codePoint : codePoints) { + if (pattern.length() != 0) { + pattern.append('|'); + } + pattern.append(Pattern.quote(codePoint)); + } + return Pattern.compile(pattern.toString()); + } +}
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