Add spellcheck and word suggestion to the prediction service

third_party/prediction/suggest/core/dictionary/digraph_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 DIGRAPH_UTILS_H
+#define DIGRAPH_UTILS_H
+
+#include "third_party/prediction/defines.h"
+
+namespace latinime {
+
+class DictionaryHeaderStructurePolicy;
+
+class DigraphUtils {
+ public:
+  typedef enum {
+    NOT_A_DIGRAPH_INDEX,
+    FIRST_DIGRAPH_CODEPOINT,
+    SECOND_DIGRAPH_CODEPOINT
+  } DigraphCodePointIndex;
+
+  typedef enum {
+    DIGRAPH_TYPE_NONE,
+    DIGRAPH_TYPE_GERMAN_UMLAUT,
+  } DigraphType;
+
+  typedef struct {
+    int first;
+    int second;
+    int compositeGlyph;
+  } digraph_t;
+
+  static bool hasDigraphForCodePoint(
+      const DictionaryHeaderStructurePolicy* const headerPolicy,
+      const int compositeGlyphCodePoint);
+  static int getDigraphCodePointForIndex(
+      const int compositeGlyphCodePoint,
+      const DigraphCodePointIndex digraphCodePointIndex);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(DigraphUtils);
+  static DigraphType getDigraphTypeForDictionary(
+      const DictionaryHeaderStructurePolicy* const headerPolicy);
+  static int getAllDigraphsForDigraphTypeAndReturnSize(
+      const DigraphType digraphType,
+      const digraph_t** const digraphs);
+  static const digraph_t* getDigraphForCodePoint(
+      const int compositeGlyphCodePoint);
+  static const digraph_t* getDigraphForDigraphTypeAndCodePoint(
+      const DigraphType digraphType,
+      const int compositeGlyphCodePoint);
+
+  static const digraph_t GERMAN_UMLAUT_DIGRAPHS[];
+  static const DigraphType USED_DIGRAPH_TYPES[];
+};
+}  // namespace latinime
+#endif  // DIGRAPH_UTILS_H