Add spellcheck and word suggestion to the prediction service

third_party/prediction/utils/autocorrection_threshold_utils.h

+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_AUTOCORRECTION_THRESHOLD_UTILS_H
+#define LATINIME_AUTOCORRECTION_THRESHOLD_UTILS_H
+
+#include "third_party/prediction/defines.h"
+
+namespace latinime {
+
+class AutocorrectionThresholdUtils {
+ public:
+  static float calcNormalizedScore(const int* before,
+                                   const int beforeLength,
+                                   const int* after,
+                                   const int afterLength,
+                                   const int score);
+  static int editDistance(const int* before,
+                          const int beforeLength,
+                          const int* after,
+                          const int afterLength);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(AutocorrectionThresholdUtils);
+
+  static const int MAX_INITIAL_SCORE;
+  static const int TYPED_LETTER_MULTIPLIER;
+  static const int FULL_WORD_MULTIPLIER;
+};
+}  // namespace latinime
+#endif  // LATINIME_AUTOCORRECTION_THRESHOLD_UTILS_H