Filters: Make behavior of "whole word" filters consistent with the web UI when filters are non-alphanumeric (#1623)

* Fix tests build

* Make behavior of non-alphanumeric whole-word filters consistent with the web UI.
Fixes #1543

* Fix typo in filter tests

app/src/androidTest/java/com/keylesspalace/tusky/TimelineDAOTest.kt

@@ -208,6 +208,7 @@ class TimelineDAOTest {
                 favouritesCount = 2 * statusId.toInt(),
                 reblogged = even,
                 favourited = !even,
+                bookmarked = false,
                 sensitive = even,
                 spoilerText = "spoier$statusId",
                 visibility = Status.Visibility.PRIVATE,
@@ -236,6 +237,7 @@ class TimelineDAOTest {
                 favouritesCount = 0,
                 reblogged = false,
                 favourited = false,
+                bookmarked = false,
                 sensitive = false,
                 spoilerText = null,
                 visibility = null,

app/src/main/java/com/keylesspalace/tusky/fragment/SFragment.java

@@ -95,6 +95,7 @@ public abstract class SFragment extends BaseFragment implements Injectable {
     private static List<Filter> filters;
     private boolean filterRemoveRegex;
     private Matcher filterRemoveRegexMatcher;
+    private static Matcher alphanumeric = Pattern.compile("^\\w+$").matcher("");
 
     @Inject
     public MastodonApi mastodonApi;
@@ -520,8 +521,11 @@ public abstract class SFragment extends BaseFragment implements Injectable {
     }
 
     private static String filterToRegexToken(Filter filter) {
-        String phrase = Pattern.quote(filter.getPhrase());
-        return filter.getWholeWord() ? String.format("(^|\\W)%s($|\\W)", phrase) : phrase;
+        String phrase = filter.getPhrase();
+        String quotedPhrase = Pattern.quote(phrase);
+        return (filter.getWholeWord() && alphanumeric.reset(phrase).matches()) ? // "whole word" should only apply to alphanumeric filters, #1543
+                String.format("(^|\\W)%s($|\\W)", quotedPhrase) :
+                quotedPhrase;
     }
 
     public static void flushFilters() {

app/src/test/java/com/keylesspalace/tusky/FilterTest.kt

@@ -86,6 +86,14 @@ class FilterTest {
                                                 expiresAt = null,
                                                 irreversible = false,
                                                 wholeWord = true
+                                        ),
+                                        Filter(
+                                                id = "123",
+                                                phrase = "@twitter.com",
+                                                context = listOf(Filter.HOME),
+                                                expiresAt = null,
+                                                irreversible = false,
+                                                wholeWord = true
                                         )
                                 )
                         )
@@ -145,7 +153,7 @@ class FilterTest {
     }
 
     @Test
-    fun shouldNotFilter_whenContentDoesNotMAtchWholeWord() {
+    fun shouldNotFilter_whenContentDoesNotMatchWholeWord() {
         assertFalse(fragment.shouldFilterStatus(
                 mockStatus(content = "one two badWholeWordTest three")
         ))
@@ -172,6 +180,13 @@ class FilterTest {
         ))
     }
 
+    @Test
+    fun shouldFilterPartialWord_whenWholeWordFilterContainsNonAlphanumericCharacters() {
+        assertTrue(fragment.shouldFilterStatus(
+                mockStatus(content = "one two someone@twitter.com three")
+        ))
+    }
+
     private fun mockStatus(
             content: String = "",
             spoilerText: String = "",