Add methods to read shortcuts from the binary dict (A2)

This contains stubs only, it does not work yet, however it
doesn't break anything.

Change-Id: If912ae84ff3ccd7a2d6588ffd6fbb9974f87ef3d

native/src/terminal_attributes.h

@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2012 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_TERMINAL_ATTRIBUTES_H
+#define LATINIME_TERMINAL_ATTRIBUTES_H
+
+#include "unigram_dictionary.h"
+
+namespace latinime {
+
+/**
+ * This class encapsulates information about a terminal that allows to
+ * retrieve local node attributes like the list of shortcuts without
+ * exposing the format structure to the client.
+ */
+class TerminalAttributes {
+ public:
+    class ShortcutIterator {
+        const uint8_t* const mDict;
+        int mPos;
+
+     public:
+        ShortcutIterator(const uint8_t* const dict, const int pos) : mDict(dict), mPos(pos) {
+        }
+
+        inline bool hasNextShortcutTarget() const {
+            // TODO: stub method. Fill this in.
+            return false;
+        }
+
+        inline int getNextShortcutTarget(const int maxDepth, uint16_t* outWord) {
+            // TODO: stub method. Fill this in.
+            return 0;
+        }
+    };
+
+ private:
+    const uint8_t* const mDict;
+    const uint8_t mFlags;
+    const int mStartPos;
+
+ public:
+    TerminalAttributes(const uint8_t* const dict, const uint8_t flags, const int pos) :
+            mDict(dict), mFlags(flags), mStartPos(pos) {
+    }
+
+    inline bool isShortcutOnly() const {
+        // TODO: stub method. Fill this in.
+        return false;
+    }
+
+    inline ShortcutIterator getShortcutIterator() const {
+        return ShortcutIterator(mDict, mStartPos);
+    }
+};
+} // namespace latinime
+
+#endif // LATINIME_TERMINAL_ATTRIBUTES_H

native/src/unigram_dictionary.cpp

@@ -25,6 +25,7 @@
 #include "unigram_dictionary.h"
 
 #include "binary_format.h"
+#include "terminal_attributes.h"
 
 namespace latinime {
 
@@ -324,13 +325,21 @@ void UnigramDictionary::getMistypedSpaceWords(ProximityInfo *proximityInfo, cons
             correction, queuePool);
 }
 
-inline void UnigramDictionary::onTerminal(
+inline void UnigramDictionary::onTerminal(const int freq,
-        const int freq, Correction *correction, WordsPriorityQueue *queue) {
+        const TerminalAttributes& terminalAttributes, Correction *correction,
+        WordsPriorityQueue *queue) {
     int wordLength;
     unsigned short* wordPointer;
     const int finalFreq = correction->getFinalFreq(freq, &wordPointer, &wordLength);
     if (finalFreq >= 0) {
-        addWord(wordPointer, wordLength, finalFreq, queue);
+        if (!terminalAttributes.isShortcutOnly()) {
+            addWord(wordPointer, wordLength, finalFreq, queue);
+        }
+        TerminalAttributes::ShortcutIterator iterator = terminalAttributes.getShortcutIterator();
+        while (iterator.hasNextShortcutTarget()) {
+            // TODO: add the shortcut to the list of suggestions using the
+            // iterator.getNextShortcutTarget(int, uint16_t*) method
+        }
     }
 }
 
@@ -646,7 +655,9 @@ inline bool UnigramDictionary::processCurrentNode(const int initialPos,
             // The frequency should be here, because we come here only if this is actually
             // a terminal node, and we are on its last char.
             const int freq = BinaryFormat::readFrequencyWithoutMovingPointer(DICT_ROOT, pos);
-            onTerminal(freq, correction, queue);
+            TerminalAttributes terminalAttributes(DICT_ROOT, flags,
+                    BinaryFormat::skipFrequency(flags, pos));
+            onTerminal(freq, terminalAttributes, correction, queue);
         }
 
         // If there are more chars in this node, then this virtual node has children.

native/src/unigram_dictionary.h

@@ -27,6 +27,7 @@
 
 namespace latinime {
 
+class TerminalAttributes;
 class UnigramDictionary {
 
 public:
@@ -115,7 +116,8 @@ private:
             const int *ycoordinates, const int *codes, const bool useFullEditDistance,
             const int inputLength, const int spaceProximityPos, Correction *correction,
             WordsPriorityQueuePool* queuePool);
-    void onTerminal(const int freq, Correction *correction, WordsPriorityQueue *queue);
+    void onTerminal(const int freq, const TerminalAttributes& terminalAttributes,
+            Correction *correction, WordsPriorityQueue *queue);
     bool needsToSkipCurrentNode(const unsigned short c,
             const int inputIndex, const int skipPos, const int depth);
     // Process a node by considering proximity, missing and excessive character