Add spellcheck and word suggestion to the prediction service

third_party/android_prediction/suggest/core/policy/weighting.cpp

Index: third_party/android_prediction/suggest/core/policy/weighting.cpp
diff --git a/third_party/android_prediction/suggest/core/policy/weighting.cpp b/third_party/android_prediction/suggest/core/policy/weighting.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..1db2625eddfff180a320b023a1116e74e86247e9
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+++ b/third_party/android_prediction/suggest/core/policy/weighting.cpp
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+/*
+ * 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.
+ */
+
+#include "third_party/android_prediction/suggest/core/policy/weighting.h"
+
+#include "third_party/android_prediction/defines.h"
+#include "third_party/android_prediction/suggest/core/dicnode/dic_node.h"
+#include "third_party/android_prediction/suggest/core/dicnode/dic_node_profiler.h"
+#include "third_party/android_prediction/suggest/core/dicnode/dic_node_utils.h"
+#include "third_party/android_prediction/suggest/core/dictionary/error_type_utils.h"
+#include "third_party/android_prediction/suggest/core/session/dic_traverse_session.h"
+
+namespace latinime {
+
+class MultiBigramMap;
+
+static inline void profile(const CorrectionType correctionType, DicNode *const node) {
+#if DEBUG_DICT
+    switch (correctionType) {
+    case CT_OMISSION:
+        PROF_OMISSION(node->mProfiler);
+        return;
+    case CT_ADDITIONAL_PROXIMITY:
+        PROF_ADDITIONAL_PROXIMITY(node->mProfiler);
+        return;
+    case CT_SUBSTITUTION:
+        PROF_SUBSTITUTION(node->mProfiler);
+        return;
+    case CT_NEW_WORD_SPACE_OMISSION:
+        PROF_NEW_WORD(node->mProfiler);
+        return;
+    case CT_MATCH:
+        PROF_MATCH(node->mProfiler);
+        return;
+    case CT_COMPLETION:
+        PROF_COMPLETION(node->mProfiler);
+        return;
+    case CT_TERMINAL:
+        PROF_TERMINAL(node->mProfiler);
+        return;
+    case CT_TERMINAL_INSERTION:
+        PROF_TERMINAL_INSERTION(node->mProfiler);
+        return;
+    case CT_NEW_WORD_SPACE_SUBSTITUTION:
+        PROF_SPACE_SUBSTITUTION(node->mProfiler);
+        return;
+    case CT_INSERTION:
+        PROF_INSERTION(node->mProfiler);
+        return;
+    case CT_TRANSPOSITION:
+        PROF_TRANSPOSITION(node->mProfiler);
+        return;
+    default:
+        // do nothing
+        return;
+    }
+#else
+    // do nothing
+#endif
+}
+
+/* static */ void Weighting::addCostAndForwardInputIndex(const Weighting *const weighting,
+        const CorrectionType correctionType, const DicTraverseSession *const traverseSession,
+        const DicNode *const parentDicNode, DicNode *const dicNode,
+        MultiBigramMap *const multiBigramMap) {
+    const int inputSize = traverseSession->getInputSize();
+    DicNode_InputStateG inputStateG;
+    inputStateG.mNeedsToUpdateInputStateG = false; // Don't use input info by default
+    const float spatialCost = Weighting::getSpatialCost(weighting, correctionType,
+            traverseSession, parentDicNode, dicNode, &inputStateG);
+    const float languageCost = Weighting::getLanguageCost(weighting, correctionType,
+            traverseSession, parentDicNode, dicNode, multiBigramMap);
+    const ErrorTypeUtils::ErrorType errorType = weighting->getErrorType(correctionType,
+            traverseSession, parentDicNode, dicNode);
+    profile(correctionType, dicNode);
+    if (inputStateG.mNeedsToUpdateInputStateG) {
+        dicNode->updateInputIndexG(&inputStateG);
+    } else {
+        dicNode->forwardInputIndex(0, getForwardInputCount(correctionType),
+                (correctionType == CT_TRANSPOSITION));
+    }
+    dicNode->addCost(spatialCost, languageCost, weighting->needsToNormalizeCompoundDistance(),
+            inputSize, errorType);
+    if (CT_NEW_WORD_SPACE_OMISSION == correctionType) {
+        // When we are on a terminal, we save the current distance for evaluating
+        // when to auto-commit partial suggestions.
+        dicNode->saveNormalizedCompoundDistanceAfterFirstWordIfNoneYet();
+    }
+}
+
+/* static */ float Weighting::getSpatialCost(const Weighting *const weighting,
+        const CorrectionType correctionType, const DicTraverseSession *const traverseSession,
+        const DicNode *const parentDicNode, const DicNode *const dicNode,
+        DicNode_InputStateG *const inputStateG) {
+    switch(correctionType) {
+    case CT_OMISSION:
+        return weighting->getOmissionCost(parentDicNode, dicNode);
+    case CT_ADDITIONAL_PROXIMITY:
+        // only used for typing
+        return weighting->getAdditionalProximityCost();
+    case CT_SUBSTITUTION:
+        // only used for typing
+        return weighting->getSubstitutionCost();
+    case CT_NEW_WORD_SPACE_OMISSION:
+        return weighting->getNewWordSpatialCost(traverseSession, dicNode, inputStateG);
+    case CT_MATCH:
+        return weighting->getMatchedCost(traverseSession, dicNode, inputStateG);
+    case CT_COMPLETION:
+        return weighting->getCompletionCost(traverseSession, dicNode);
+    case CT_TERMINAL:
+        return weighting->getTerminalSpatialCost(traverseSession, dicNode);
+    case CT_TERMINAL_INSERTION:
+        return weighting->getTerminalInsertionCost(traverseSession, dicNode);
+    case CT_NEW_WORD_SPACE_SUBSTITUTION:
+        return weighting->getSpaceSubstitutionCost(traverseSession, dicNode);
+    case CT_INSERTION:
+        return weighting->getInsertionCost(traverseSession, parentDicNode, dicNode);
+    case CT_TRANSPOSITION:
+        return weighting->getTranspositionCost(traverseSession, parentDicNode, dicNode);
+    default:
+        return 0.0f;
+    }
+}
+
+/* static */ float Weighting::getLanguageCost(const Weighting *const weighting,
+        const CorrectionType correctionType, const DicTraverseSession *const traverseSession,
+        const DicNode *const parentDicNode, const DicNode *const dicNode,
+        MultiBigramMap *const multiBigramMap) {
+    switch(correctionType) {
+    case CT_OMISSION:
+        return 0.0f;
+    case CT_SUBSTITUTION:
+        return 0.0f;
+    case CT_NEW_WORD_SPACE_OMISSION:
+        return weighting->getNewWordBigramLanguageCost(
+                traverseSession, parentDicNode, multiBigramMap);
+    case CT_MATCH:
+        return 0.0f;
+    case CT_COMPLETION:
+        return 0.0f;
+    case CT_TERMINAL: {
+        const float languageImprobability =
+                DicNodeUtils::getBigramNodeImprobability(
+                        traverseSession->getDictionaryStructurePolicy(), dicNode, multiBigramMap);
+        return weighting->getTerminalLanguageCost(traverseSession, dicNode, languageImprobability);
+    }
+    case CT_TERMINAL_INSERTION:
+        return 0.0f;
+    case CT_NEW_WORD_SPACE_SUBSTITUTION:
+        return weighting->getNewWordBigramLanguageCost(
+                traverseSession, parentDicNode, multiBigramMap);
+    case CT_INSERTION:
+        return 0.0f;
+    case CT_TRANSPOSITION:
+        return 0.0f;
+    default:
+        return 0.0f;
+    }
+}
+
+/* static */ int Weighting::getForwardInputCount(const CorrectionType correctionType) {
+    switch(correctionType) {
+        case CT_OMISSION:
+            return 0;
+        case CT_ADDITIONAL_PROXIMITY:
+            return 0; /* 0 because CT_MATCH will be called */
+        case CT_SUBSTITUTION:
+            return 0; /* 0 because CT_MATCH will be called */
+        case CT_NEW_WORD_SPACE_OMISSION:
+            return 0;
+        case CT_MATCH:
+            return 1;
+        case CT_COMPLETION:
+            return 1;
+        case CT_TERMINAL:
+            return 0;
+        case CT_TERMINAL_INSERTION:
+            return 1;
+        case CT_NEW_WORD_SPACE_SUBSTITUTION:
+            return 1;
+        case CT_INSERTION:
+            return 2; /* look ahead + skip the current char */
+        case CT_TRANSPOSITION:
+            return 2; /* look ahead + skip the current char */
+        default:
+            return 0;
+    }
+}
+}  // namespace latinime