Refactor detectLinks (#297)

* Refactor detect-links
* Add autolink-java license

Clover/app/build.gradle

@@ -130,4 +130,5 @@ dependencies {
     compile 'com.davemorrissey.labs:subsampling-scale-image-view:3.5.0'
     compile 'com.squareup.okhttp3:okhttp:3.4.1'
     compile 'de.greenrobot:eventbus:2.4.0'
+    compile 'org.nibor.autolink:autolink:0.6.0'
 }

Clover/app/src/main/assets/html/licenses.html

@@ -194,5 +194,33 @@ The GIFLIB distribution is Copyright (c) 1997  Eric S. Raymond
         </code>
     </pre>
     <br>
+    <h3>autolink-java</h3>
+    <a href="https://github.com/robinst/autolink-java">https://github.com/robinst/autolink-java</a>
+    <pre>
+        <code>
+The MIT License (MIT)
+
+Copyright (c) 2015 Robin Stocker
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+        </code>
+    </pre>
+    <br>
 </body>
 </html>

Clover/app/src/main/java/org/floens/chan/chan/ChanParser.java

@@ -47,8 +47,12 @@ import org.jsoup.parser.Parser;
 import org.jsoup.select.Elements;
 import org.jsoup.select.NodeTraversor;
 import org.jsoup.select.NodeVisitor;
+import org.nibor.autolink.LinkExtractor;
+import org.nibor.autolink.LinkSpan;
+import org.nibor.autolink.LinkType;
 
 import java.util.ArrayList;
+import java.util.EnumSet;
 import java.util.List;
 import java.util.Set;
 import java.util.regex.Matcher;
@@ -63,6 +67,8 @@ public class ChanParser {
     private static ChanParser instance = new ChanParser();
     private final DatabaseManager databaseManager;
 
+    private final LinkExtractor linkExtractor = LinkExtractor.builder().linkTypes(EnumSet.of(LinkType.URL)).build();
+
     public ChanParser() {
         databaseManager = Chan.getDatabaseManager();
     }
@@ -445,40 +451,16 @@ public class ChanParser {
     }
 
     private void detectLinks(Theme theme, Post post, String text, SpannableString spannable) {
-        int startPos = 0;
-        int endPos;
-        while (true) {
-            startPos = text.indexOf("://", startPos);
-            if (startPos < 0) break;
-
-            // go back to the first space
-            while (startPos > 0 && !isWhitespace(text.charAt(startPos - 1))) {
-                startPos--;
-            }
-
-            // find the last non whitespace character
-            endPos = startPos;
-            while (endPos < text.length() - 1 && !isWhitespace(text.charAt(endPos + 1))) {
-                endPos++;
-            }
-
-            // one past
-            endPos++;
-
-            String linkString = text.substring(startPos, endPos);
-
-            PostLinkable pl = new PostLinkable(theme, post, linkString, linkString, PostLinkable.Type.LINK);
-            spannable.setSpan(pl, startPos, endPos, 0);
+        // use autolink-java lib to detect links
+        final Iterable<LinkSpan> links = linkExtractor.extractLinks(text);
+        for(final LinkSpan link : links) {
+            final String linkText = text.substring(link.getBeginIndex(), link.getEndIndex());
+            final PostLinkable pl = new PostLinkable(theme, post, linkText, linkText, PostLinkable.Type.LINK);
+            spannable.setSpan(pl, link.getBeginIndex(), link.getEndIndex(), 0);
             post.linkables.add(pl);
-
-            startPos = endPos;
         }
     }
 
-    private boolean isWhitespace(char c) {
-        return Character.isWhitespace(c) || c == '>'; // consider > as a link separator
-    }
-
     // Below code taken from org.jsoup.nodes.Element.text(), but it preserves <br>
     private String getNodeText(Element node) {
         final StringBuilder accum = new StringBuilder();