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/*
* Copyright (C) 2010 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_UNIGRAM_DICTIONARY_H
#define LATINIME_UNIGRAM_DICTIONARY_H
#include <stdint.h>
#include "correction.h"
#include "correction_state.h"
#include "defines.h"
#include "proximity_info.h"
namespace latinime {
class UnigramDictionary {
public:
// Mask and flags for children address type selection.
static const int MASK_GROUP_ADDRESS_TYPE = 0xC0;
static const int FLAG_GROUP_ADDRESS_TYPE_NOADDRESS = 0x00;
static const int FLAG_GROUP_ADDRESS_TYPE_ONEBYTE = 0x40;
static const int FLAG_GROUP_ADDRESS_TYPE_TWOBYTES = 0x80;
static const int FLAG_GROUP_ADDRESS_TYPE_THREEBYTES = 0xC0;
// Flag for single/multiple char group
static const int FLAG_HAS_MULTIPLE_CHARS = 0x20;
// Flag for terminal groups
static const int FLAG_IS_TERMINAL = 0x10;
// Flag for bigram presence
static const int FLAG_HAS_BIGRAMS = 0x04;
// Attribute (bigram/shortcut) related flags:
// Flag for presence of more attributes
static const int FLAG_ATTRIBUTE_HAS_NEXT = 0x80;
// Flag for sign of offset. If this flag is set, the offset value must be negated.
static const int FLAG_ATTRIBUTE_OFFSET_NEGATIVE = 0x40;
// Mask for attribute frequency, stored on 4 bits inside the flags byte.
static const int MASK_ATTRIBUTE_FREQUENCY = 0x0F;
// Mask and flags for attribute address type selection.
static const int MASK_ATTRIBUTE_ADDRESS_TYPE = 0x30;
static const int FLAG_ATTRIBUTE_ADDRESS_TYPE_ONEBYTE = 0x10;
static const int FLAG_ATTRIBUTE_ADDRESS_TYPE_TWOBYTES = 0x20;
static const int FLAG_ATTRIBUTE_ADDRESS_TYPE_THREEBYTES = 0x30;
UnigramDictionary(const uint8_t* const streamStart, int typedLetterMultipler,
int fullWordMultiplier, int maxWordLength, int maxWords, int maxProximityChars,
const bool isLatestDictVersion);
bool isValidWord(const uint16_t* const inWord, const int length) const;
int getBigramPosition(int pos, unsigned short *word, int offset, int length) const;
int getSuggestions(ProximityInfo *proximityInfo, const int *xcoordinates,
const int *ycoordinates, const int *codes, const int codesSize, const int flags,
unsigned short *outWords, int *frequencies);
virtual ~UnigramDictionary();
private:
void getWordSuggestions(ProximityInfo *proximityInfo, const int *xcoordinates,
const int *ycoordinates, const int *codes, const int codesSize,
unsigned short *outWords, int *frequencies, const int flags);
bool isDigraph(const int* codes, const int i, const int codesSize) const;
void getWordWithDigraphSuggestionsRec(ProximityInfo *proximityInfo,
const int *xcoordinates, const int* ycoordinates, const int *codesBuffer,
const int codesBufferSize, const int flags, const int* codesSrc, const int codesRemain,
const int currentDepth, int* codesDest, unsigned short* outWords, int* frequencies);
void initSuggestions(ProximityInfo *proximityInfo, const int *xcoordinates,
const int *ycoordinates, const int *codes, const int codesSize,
unsigned short *outWords, int *frequencies);
void getSuggestionCandidates(const bool useFullEditDistance);
bool addWord(unsigned short *word, int length, int frequency);
void getSplitTwoWordsSuggestion(const int inputLength, Correction *correction);
void getMissingSpaceWords(const int inputLength, const int missingSpacePos,
Correction *correction, const bool useFullEditDistance);
void getMistypedSpaceWords(const int inputLength, const int spaceProximityPos,
Correction *correction, const bool useFullEditDistance);
void onTerminal(const int freq, Correction *correction);
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
bool processCurrentNode(const int initialPos,
Correction *correction, int *newCount,
int *newChildPosition, int *nextSiblingPosition);
int getMostFrequentWordLike(const int startInputIndex, const int inputLength,
unsigned short *word);
int getMostFrequentWordLikeInner(const uint16_t* const inWord, const int length,
short unsigned int* outWord);
const uint8_t* const DICT_ROOT;
const int MAX_WORD_LENGTH;
const int MAX_WORDS;
const int MAX_PROXIMITY_CHARS;
const bool IS_LATEST_DICT_VERSION;
const int TYPED_LETTER_MULTIPLIER;
const int FULL_WORD_MULTIPLIER;
const int ROOT_POS;
const unsigned int BYTES_IN_ONE_CHAR;
const int MAX_UMLAUT_SEARCH_DEPTH;
// Flags for special processing
// Those *must* match the flags in BinaryDictionary.Flags.ALL_FLAGS in BinaryDictionary.java
// or something very bad (like, the apocalypse) will happen.
// Please update both at the same time.
enum {
REQUIRES_GERMAN_UMLAUT_PROCESSING = 0x1,
USE_FULL_EDIT_DISTANCE = 0x2
};
static const struct digraph_t { int first; int second; } GERMAN_UMLAUT_DIGRAPHS[];
int *mFrequencies;
unsigned short *mOutputChars;
ProximityInfo *mProximityInfo;
Correction *mCorrection;
int mInputLength;
// MAX_WORD_LENGTH_INTERNAL must be bigger than MAX_WORD_LENGTH
unsigned short mWord[MAX_WORD_LENGTH_INTERNAL];
int mStackChildCount[MAX_WORD_LENGTH_INTERNAL];// TODO: remove
int mStackInputIndex[MAX_WORD_LENGTH_INTERNAL];// TODO: remove
int mStackSiblingPos[MAX_WORD_LENGTH_INTERNAL];// TODO: remove
};
} // namespace latinime
#endif // LATINIME_UNIGRAM_DICTIONARY_H
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