Add DigraphUtils class

Add a new DigraphUtils class to manage digraph handling for both
gesture and typing input.

Bug: 8493920
Change-Id: I3a509e1311b9039653f9f488d3c28bb54205f416

1 files changed, 47 insertions, 0 deletions

diff --git a/native/jni/src/digraph_utils.h b/native/jni/src/digraph_utils.h
new file mode 100644
index 000000000..6e364b67a
--- /dev/null
+++ b/native/jni/src/digraph_utils.h
@@ -0,0 +1,47 @@
+/*
+ * 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
+
+namespace latinime {
+
+class DigraphUtils {
+ public:
+    typedef enum {
+        NOT_A_DIGRAPH_INDEX,
+        FIRST_DIGRAPH_CODEPOINT,
+        SECOND_DIGRAPH_CODEPOINT
+    } DigraphCodePointIndex;
+
+    typedef struct { int first; int second; int compositeGlyph; } digraph_t;
+
+    static bool hasDigraphForCodePoint(const int dictFlags, const int compositeGlyphCodePoint);
+    static int getAllDigraphsForDictionaryAndReturnSize(
+            const int dictFlags, const digraph_t **digraphs);
+    static int getDigraphCodePointForIndex(const int dictFlags, const int compositeGlyphCodePoint,
+            const DigraphCodePointIndex digraphCodePointIndex);
+
+ private:
+    DISALLOW_IMPLICIT_CONSTRUCTORS(DigraphUtils);
+    static const digraph_t *getDigraphForCodePoint(
+            const int dictFlags, const int compositeGlyphCodePoint);
+
+    static const digraph_t GERMAN_UMLAUT_DIGRAPHS[];
+    static const digraph_t FRENCH_LIGATURES_DIGRAPHS[];
+};
+} // namespace latinime
+#endif // DIGRAPH_UTILS_H