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Merge "Implement getTerminalNodePositionOfWord for ver3 dict."

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This commit is contained in:
Keisuke Kuroynagi 2013-08-08 05:24:42 +00:00 committed by Android (Google) Code Review
commit b0ab71be70
3 changed files with 100 additions and 5 deletions
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2
native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_node_reader.h
View file

@ -42,7 +42,7 @@ class DynamicPatriciaTrieNodeReader {
// Reads node information from dictionary buffer and updates members with the information.
AK_FORCE_INLINE void fetchNodeInfoFromBuffer(const int nodePos) {
fetchNodeInfoFromBufferAndGetNodeCodePoints(mNodePos , 0 /* maxCodePointCount */,
fetchNodeInfoFromBufferAndGetNodeCodePoints(nodePos , 0 /* maxCodePointCount */,
0 /* outCodePoints */);
}

102
native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_policy.cpp
View file

@ -27,6 +27,8 @@
namespace latinime {
const DynamicPatriciaTriePolicy DynamicPatriciaTriePolicy::sInstance;
// To avoid infinite loop caused by invalid or malicious forward links.
const int DynamicPatriciaTriePolicy::MAX_CHILD_COUNT_TO_AVOID_INFINITE_LOOP = 100000;
void DynamicPatriciaTriePolicy::createAndGetAllChildNodes(const DicNode *const dicNode,
const BinaryDictionaryInfo *const binaryDictionaryInfo,
@ -37,14 +39,23 @@ void DynamicPatriciaTriePolicy::createAndGetAllChildNodes(const DicNode *const d
DynamicPatriciaTrieNodeReader nodeReader(binaryDictionaryInfo);
int mergedNodeCodePoints[MAX_WORD_LENGTH];
int nextPos = dicNode->getChildrenPos();
int totalChildCount = 0;
do {
const int childCount = PatriciaTrieReadingUtils::getGroupCountAndAdvancePosition(
binaryDictionaryInfo->getDictRoot(), &nextPos);
totalChildCount += childCount;
if (childCount <= 0 || totalChildCount > MAX_CHILD_COUNT_TO_AVOID_INFINITE_LOOP) {
// Invalid dictionary.
AKLOGI("Invalid dictionary. childCount: %d, totalChildCount: %d, MAX: %d",
childCount, totalChildCount, MAX_CHILD_COUNT_TO_AVOID_INFINITE_LOOP);
ASSERT(false);
return;
}
for (int i = 0; i < childCount; i++) {
nodeReader.fetchNodeInfoFromBufferAndGetNodeCodePoints(nextPos, MAX_WORD_LENGTH,
mergedNodeCodePoints);
if (!nodeReader.isDeleted() && !nodeFilter->isFilteredOut(mergedNodeCodePoints[0])) {
// Push child note when the node is not deleted and not filtered out.
// Push child node when the node is not deleted and not filtered out.
childDicNodes->pushLeavingChild(dicNode, nodeReader.getNodePos(),
nodeReader.getChildrenPos(), nodeReader.getProbability(),
nodeReader.isTerminal(), nodeReader.hasChildren(),
@ -55,13 +66,17 @@ void DynamicPatriciaTriePolicy::createAndGetAllChildNodes(const DicNode *const d
}
nextPos = DynamicPatriciaTrieReadingUtils::getForwardLinkPosition(
binaryDictionaryInfo->getDictRoot(), nextPos);
} while(DynamicPatriciaTrieReadingUtils::isValidForwardLinkPosition(nextPos));
} while (DynamicPatriciaTrieReadingUtils::isValidForwardLinkPosition(nextPos));
}
int DynamicPatriciaTriePolicy::getCodePointsAndProbabilityAndReturnCodePointCount(
const BinaryDictionaryInfo *const binaryDictionaryInfo,
const int nodePos, const int maxCodePointCount, int *const outCodePoints,
int *const outUnigramProbability) const {
if (nodePos == NOT_A_VALID_WORD_POS) {
*outUnigramProbability = NOT_A_PROBABILITY;
return 0;
}
// This method traverses parent nodes from the terminal by following parent pointers; thus,
// node code points are stored in the buffer in the reverse order.
int reverseCodePoints[maxCodePointCount];
@ -106,12 +121,85 @@ int DynamicPatriciaTriePolicy::getCodePointsAndProbabilityAndReturnCodePointCoun
int DynamicPatriciaTriePolicy::getTerminalNodePositionOfWord(
const BinaryDictionaryInfo *const binaryDictionaryInfo, const int *const inWord,
const int length, const bool forceLowerCaseSearch) const {
// TODO: Implement.
return NOT_A_DICT_POS;
int searchCodePoints[length];
for (int i = 0; i < length; ++i) {
searchCodePoints[i] = forceLowerCaseSearch ? CharUtils::toLowerCase(inWord[i]) : inWord[i];
}
int mergedNodeCodePoints[MAX_WORD_LENGTH];
int currentLength = 0;
int pos = getRootPosition();
DynamicPatriciaTrieNodeReader nodeReader(binaryDictionaryInfo);
while (currentLength <= length) {
// When foundMatchedNode becomes true, currentLength is increased at least once.
bool foundMatchedNode = false;
int totalChildCount = 0;
do {
const int childCount = PatriciaTrieReadingUtils::getGroupCountAndAdvancePosition(
binaryDictionaryInfo->getDictRoot(), &pos);
totalChildCount += childCount;
if (childCount <= 0 || totalChildCount > MAX_CHILD_COUNT_TO_AVOID_INFINITE_LOOP) {
// Invalid dictionary.
AKLOGI("Invalid dictionary. childCount: %d, totalChildCount: %d, MAX: %d",
childCount, totalChildCount, MAX_CHILD_COUNT_TO_AVOID_INFINITE_LOOP);
ASSERT(false);
return NOT_A_VALID_WORD_POS;
}
for (int i = 0; i < childCount; i++) {
nodeReader.fetchNodeInfoFromBufferAndGetNodeCodePoints(pos, MAX_WORD_LENGTH,
mergedNodeCodePoints);
if (nodeReader.isDeleted() || nodeReader.getCodePointCount() <= 0) {
// Skip deleted or empty node.
pos = nodeReader.getSiblingNodePos();
continue;
}
bool matched = true;
for (int j = 0; j < nodeReader.getCodePointCount(); ++j) {
if (mergedNodeCodePoints[j] != searchCodePoints[currentLength + j]) {
// Different code point is found.
matched = false;
break;
}
}
if (matched) {
currentLength += nodeReader.getCodePointCount();
if (length == currentLength) {
// Terminal position is found.
return nodeReader.getNodePos();
}
if (!nodeReader.hasChildren()) {
return NOT_A_VALID_WORD_POS;
}
foundMatchedNode = true;
// Advance to the children nodes.
pos = nodeReader.getChildrenPos();
break;
}
// Try next sibling node.
pos = nodeReader.getSiblingNodePos();
}
if (foundMatchedNode) {
break;
}
// If the matched node is not found in the current node group, try to follow the
// forward link.
pos = DynamicPatriciaTrieReadingUtils::getForwardLinkPosition(
binaryDictionaryInfo->getDictRoot(), pos);
} while (DynamicPatriciaTrieReadingUtils::isValidForwardLinkPosition(pos));
if (!foundMatchedNode) {
// Matched node is not found.
return NOT_A_VALID_WORD_POS;
}
}
// If we already traversed the tree further than the word is long, there means
// there was no match (or we would have found it).
return NOT_A_VALID_WORD_POS;
}
int DynamicPatriciaTriePolicy::getUnigramProbability(
const BinaryDictionaryInfo *const binaryDictionaryInfo, const int nodePos) const {
if (nodePos == NOT_A_VALID_WORD_POS) {
return NOT_A_PROBABILITY;
}
DynamicPatriciaTrieNodeReader nodeReader(binaryDictionaryInfo);
nodeReader.fetchNodeInfoFromBuffer(nodePos);
if (nodeReader.isDeleted() || nodeReader.isBlacklisted() || nodeReader.isNotAWord()) {
@ -123,6 +211,9 @@ int DynamicPatriciaTriePolicy::getUnigramProbability(
int DynamicPatriciaTriePolicy::getShortcutPositionOfNode(
const BinaryDictionaryInfo *const binaryDictionaryInfo,
const int nodePos) const {
if (nodePos == NOT_A_VALID_WORD_POS) {
return NOT_A_DICT_POS;
}
DynamicPatriciaTrieNodeReader nodeReader(binaryDictionaryInfo);
nodeReader.fetchNodeInfoFromBuffer(nodePos);
if (nodeReader.isDeleted()) {
@ -134,6 +225,9 @@ int DynamicPatriciaTriePolicy::getShortcutPositionOfNode(
int DynamicPatriciaTriePolicy::getBigramsPositionOfNode(
const BinaryDictionaryInfo *const binaryDictionaryInfo,
const int nodePos) const {
if (nodePos == NOT_A_VALID_WORD_POS) {
return NOT_A_DICT_POS;
}
DynamicPatriciaTrieNodeReader nodeReader(binaryDictionaryInfo);
nodeReader.fetchNodeInfoFromBuffer(nodePos);
if (nodeReader.isDeleted()) {

1
native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_policy.h
View file

@ -61,6 +61,7 @@ class DynamicPatriciaTriePolicy : public DictionaryStructurePolicy {
private:
DISALLOW_COPY_AND_ASSIGN(DynamicPatriciaTriePolicy);
static const DynamicPatriciaTriePolicy sInstance;
static const int MAX_CHILD_COUNT_TO_AVOID_INFINITE_LOOP;
DynamicPatriciaTriePolicy() {}
~DynamicPatriciaTriePolicy() {}