Add highlighting to keyserver/keybase search

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/Highlighter.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2014 Thialfihar <thi@thialfihar.org>
+ *
+ * This program 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.
+ *
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.sufficientlysecure.keychain.util;
+
+import android.content.Context;
+import android.text.Spannable;
+import android.text.style.ForegroundColorSpan;
+
+import org.sufficientlysecure.keychain.R;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class Highlighter {
+    private Context mContext;
+    private String mQuery;
+
+    public Highlighter(Context context, String query) {
+        mContext = context;
+        mQuery = query;
+    }
+
+    public Spannable highlight(String text) {
+        Spannable highlight = Spannable.Factory.getInstance().newSpannable(text);
+
+        if (mQuery == null) {
+            return highlight;
+        }
+
+        Pattern pattern = Pattern.compile("(?i)(" + mQuery.trim().replaceAll("\\s+", "|") + ")");
+        Matcher matcher = pattern.matcher(text);
+        while (matcher.find()) {
+            highlight.setSpan(
+                    new ForegroundColorSpan(mContext.getResources().getColor(R.color.emphasis)),
+                    matcher.start(),
+                    matcher.end(),
+                    Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
+        }
+
+        return highlight;
+    }
+}