597 lines
18 KiB
C++
597 lines
18 KiB
C++
/*
|
|
**
|
|
** Copyright 2009, 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 <stdio.h>
|
|
#include <fcntl.h>
|
|
#include <sys/mman.h>
|
|
#include <string.h>
|
|
//#define LOG_TAG "dictionary.cpp"
|
|
//#include <cutils/log.h>
|
|
#define LOGI
|
|
|
|
#include "dictionary.h"
|
|
#include "basechars.h"
|
|
#include "char_utils.h"
|
|
|
|
#define DEBUG_DICT 0
|
|
#define DICTIONARY_VERSION_MIN 200
|
|
#define DICTIONARY_HEADER_SIZE 2
|
|
#define NOT_VALID_WORD -99
|
|
|
|
namespace latinime {
|
|
|
|
Dictionary::Dictionary(void *dict, int typedLetterMultiplier, int fullWordMultiplier)
|
|
{
|
|
mDict = (unsigned char*) dict;
|
|
mTypedLetterMultiplier = typedLetterMultiplier;
|
|
mFullWordMultiplier = fullWordMultiplier;
|
|
getVersionNumber();
|
|
}
|
|
|
|
Dictionary::~Dictionary()
|
|
{
|
|
}
|
|
|
|
int Dictionary::getSuggestions(int *codes, int codesSize, unsigned short *outWords, int *frequencies,
|
|
int maxWordLength, int maxWords, int maxAlternatives, int skipPos,
|
|
int *nextLetters, int nextLettersSize)
|
|
{
|
|
int suggWords;
|
|
mFrequencies = frequencies;
|
|
mOutputChars = outWords;
|
|
mInputCodes = codes;
|
|
mInputLength = codesSize;
|
|
mMaxAlternatives = maxAlternatives;
|
|
mMaxWordLength = maxWordLength;
|
|
mMaxWords = maxWords;
|
|
mSkipPos = skipPos;
|
|
mMaxEditDistance = mInputLength < 5 ? 2 : mInputLength / 2;
|
|
mNextLettersFrequencies = nextLetters;
|
|
mNextLettersSize = nextLettersSize;
|
|
|
|
if (checkIfDictVersionIsLatest()) {
|
|
getWordsRec(DICTIONARY_HEADER_SIZE, 0, mInputLength * 3, false, 1, 0, 0);
|
|
} else {
|
|
getWordsRec(0, 0, mInputLength * 3, false, 1, 0, 0);
|
|
}
|
|
|
|
// Get the word count
|
|
suggWords = 0;
|
|
while (suggWords < mMaxWords && mFrequencies[suggWords] > 0) suggWords++;
|
|
if (DEBUG_DICT) LOGI("Returning %d words", suggWords);
|
|
|
|
if (DEBUG_DICT) {
|
|
LOGI("Next letters: ");
|
|
for (int k = 0; k < nextLettersSize; k++) {
|
|
if (mNextLettersFrequencies[k] > 0) {
|
|
LOGI("%c = %d,", k, mNextLettersFrequencies[k]);
|
|
}
|
|
}
|
|
LOGI("\n");
|
|
}
|
|
return suggWords;
|
|
}
|
|
|
|
void
|
|
Dictionary::registerNextLetter(unsigned short c)
|
|
{
|
|
if (c < mNextLettersSize) {
|
|
mNextLettersFrequencies[c]++;
|
|
}
|
|
}
|
|
|
|
void
|
|
Dictionary::getVersionNumber()
|
|
{
|
|
mVersion = (mDict[0] & 0xFF);
|
|
mBigram = (mDict[1] & 0xFF);
|
|
LOGI("IN NATIVE SUGGEST Version: %d Bigram : %d \n", mVersion, mBigram);
|
|
}
|
|
|
|
// Checks whether it has the latest dictionary or the old dictionary
|
|
bool
|
|
Dictionary::checkIfDictVersionIsLatest()
|
|
{
|
|
return (mVersion >= DICTIONARY_VERSION_MIN) && (mBigram == 1 || mBigram == 0);
|
|
}
|
|
|
|
unsigned short
|
|
Dictionary::getChar(int *pos)
|
|
{
|
|
unsigned short ch = (unsigned short) (mDict[(*pos)++] & 0xFF);
|
|
// If the code is 255, then actual 16 bit code follows (in big endian)
|
|
if (ch == 0xFF) {
|
|
ch = ((mDict[*pos] & 0xFF) << 8) | (mDict[*pos + 1] & 0xFF);
|
|
(*pos) += 2;
|
|
}
|
|
return ch;
|
|
}
|
|
|
|
int
|
|
Dictionary::getAddress(int *pos)
|
|
{
|
|
int address = 0;
|
|
if ((mDict[*pos] & FLAG_ADDRESS_MASK) == 0) {
|
|
*pos += 1;
|
|
} else {
|
|
address += (mDict[*pos] & (ADDRESS_MASK >> 16)) << 16;
|
|
address += (mDict[*pos + 1] & 0xFF) << 8;
|
|
address += (mDict[*pos + 2] & 0xFF);
|
|
*pos += 3;
|
|
}
|
|
return address;
|
|
}
|
|
|
|
int
|
|
Dictionary::getFreq(int *pos)
|
|
{
|
|
int freq = mDict[(*pos)++] & 0xFF;
|
|
|
|
if (checkIfDictVersionIsLatest()) {
|
|
// skipping bigram
|
|
int bigramExist = (mDict[*pos] & FLAG_BIGRAM_READ);
|
|
if (bigramExist > 0) {
|
|
int nextBigramExist = 1;
|
|
while (nextBigramExist > 0) {
|
|
(*pos) += 3;
|
|
nextBigramExist = (mDict[(*pos)++] & FLAG_BIGRAM_CONTINUED);
|
|
}
|
|
} else {
|
|
(*pos)++;
|
|
}
|
|
}
|
|
|
|
return freq;
|
|
}
|
|
|
|
int
|
|
Dictionary::wideStrLen(unsigned short *str)
|
|
{
|
|
if (!str) return 0;
|
|
unsigned short *end = str;
|
|
while (*end)
|
|
end++;
|
|
return end - str;
|
|
}
|
|
|
|
bool
|
|
Dictionary::addWord(unsigned short *word, int length, int frequency)
|
|
{
|
|
word[length] = 0;
|
|
if (DEBUG_DICT) {
|
|
char s[length + 1];
|
|
for (int i = 0; i <= length; i++) s[i] = word[i];
|
|
LOGI("Found word = %s, freq = %d : \n", s, frequency);
|
|
}
|
|
|
|
// Find the right insertion point
|
|
int insertAt = 0;
|
|
while (insertAt < mMaxWords) {
|
|
if (frequency > mFrequencies[insertAt]
|
|
|| (mFrequencies[insertAt] == frequency
|
|
&& length < wideStrLen(mOutputChars + insertAt * mMaxWordLength))) {
|
|
break;
|
|
}
|
|
insertAt++;
|
|
}
|
|
if (insertAt < mMaxWords) {
|
|
memmove((char*) mFrequencies + (insertAt + 1) * sizeof(mFrequencies[0]),
|
|
(char*) mFrequencies + insertAt * sizeof(mFrequencies[0]),
|
|
(mMaxWords - insertAt - 1) * sizeof(mFrequencies[0]));
|
|
mFrequencies[insertAt] = frequency;
|
|
memmove((char*) mOutputChars + (insertAt + 1) * mMaxWordLength * sizeof(short),
|
|
(char*) mOutputChars + (insertAt ) * mMaxWordLength * sizeof(short),
|
|
(mMaxWords - insertAt - 1) * sizeof(short) * mMaxWordLength);
|
|
unsigned short *dest = mOutputChars + (insertAt ) * mMaxWordLength;
|
|
while (length--) {
|
|
*dest++ = *word++;
|
|
}
|
|
*dest = 0; // NULL terminate
|
|
if (DEBUG_DICT) LOGI("Added word at %d\n", insertAt);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
Dictionary::addWordBigram(unsigned short *word, int length, int frequency)
|
|
{
|
|
word[length] = 0;
|
|
if (DEBUG_DICT) {
|
|
char s[length + 1];
|
|
for (int i = 0; i <= length; i++) s[i] = word[i];
|
|
LOGI("Bigram: Found word = %s, freq = %d : \n", s, frequency);
|
|
}
|
|
|
|
// Find the right insertion point
|
|
int insertAt = 0;
|
|
while (insertAt < mMaxBigrams) {
|
|
if (frequency > mBigramFreq[insertAt]
|
|
|| (mBigramFreq[insertAt] == frequency
|
|
&& length < wideStrLen(mBigramChars + insertAt * mMaxWordLength))) {
|
|
break;
|
|
}
|
|
insertAt++;
|
|
}
|
|
LOGI("Bigram: InsertAt -> %d maxBigrams: %d\n", insertAt, mMaxBigrams);
|
|
if (insertAt < mMaxBigrams) {
|
|
memmove((char*) mBigramFreq + (insertAt + 1) * sizeof(mBigramFreq[0]),
|
|
(char*) mBigramFreq + insertAt * sizeof(mBigramFreq[0]),
|
|
(mMaxBigrams - insertAt - 1) * sizeof(mBigramFreq[0]));
|
|
mBigramFreq[insertAt] = frequency;
|
|
memmove((char*) mBigramChars + (insertAt + 1) * mMaxWordLength * sizeof(short),
|
|
(char*) mBigramChars + (insertAt ) * mMaxWordLength * sizeof(short),
|
|
(mMaxBigrams - insertAt - 1) * sizeof(short) * mMaxWordLength);
|
|
unsigned short *dest = mBigramChars + (insertAt ) * mMaxWordLength;
|
|
while (length--) {
|
|
*dest++ = *word++;
|
|
}
|
|
*dest = 0; // NULL terminate
|
|
if (DEBUG_DICT) LOGI("Bigram: Added word at %d\n", insertAt);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
unsigned short
|
|
Dictionary::toLowerCase(unsigned short c) {
|
|
if (c < sizeof(BASE_CHARS) / sizeof(BASE_CHARS[0])) {
|
|
c = BASE_CHARS[c];
|
|
}
|
|
if (c >='A' && c <= 'Z') {
|
|
c |= 32;
|
|
} else if (c > 127) {
|
|
c = latin_tolower(c);
|
|
}
|
|
return c;
|
|
}
|
|
|
|
bool
|
|
Dictionary::sameAsTyped(unsigned short *word, int length)
|
|
{
|
|
if (length != mInputLength) {
|
|
return false;
|
|
}
|
|
int *inputCodes = mInputCodes;
|
|
while (length--) {
|
|
if ((unsigned int) *inputCodes != (unsigned int) *word) {
|
|
return false;
|
|
}
|
|
inputCodes += mMaxAlternatives;
|
|
word++;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static char QUOTE = '\'';
|
|
|
|
void
|
|
Dictionary::getWordsRec(int pos, int depth, int maxDepth, bool completion, int snr, int inputIndex,
|
|
int diffs)
|
|
{
|
|
// Optimization: Prune out words that are too long compared to how much was typed.
|
|
if (depth > maxDepth) {
|
|
return;
|
|
}
|
|
if (diffs > mMaxEditDistance) {
|
|
return;
|
|
}
|
|
int count = getCount(&pos);
|
|
int *currentChars = NULL;
|
|
if (mInputLength <= inputIndex) {
|
|
completion = true;
|
|
} else {
|
|
currentChars = mInputCodes + (inputIndex * mMaxAlternatives);
|
|
}
|
|
|
|
for (int i = 0; i < count; i++) {
|
|
// -- at char
|
|
unsigned short c = getChar(&pos);
|
|
// -- at flag/add
|
|
unsigned short lowerC = toLowerCase(c);
|
|
bool terminal = getTerminal(&pos);
|
|
int childrenAddress = getAddress(&pos);
|
|
// -- after address or flag
|
|
int freq = 1;
|
|
if (terminal) freq = getFreq(&pos);
|
|
// -- after add or freq
|
|
|
|
// If we are only doing completions, no need to look at the typed characters.
|
|
if (completion) {
|
|
mWord[depth] = c;
|
|
if (terminal) {
|
|
addWord(mWord, depth + 1, freq * snr);
|
|
if (depth >= mInputLength && mSkipPos < 0) {
|
|
registerNextLetter(mWord[mInputLength]);
|
|
}
|
|
}
|
|
if (childrenAddress != 0) {
|
|
getWordsRec(childrenAddress, depth + 1, maxDepth,
|
|
completion, snr, inputIndex, diffs);
|
|
}
|
|
} else if ((c == QUOTE && currentChars[0] != QUOTE) || mSkipPos == depth) {
|
|
// Skip the ' or other letter and continue deeper
|
|
mWord[depth] = c;
|
|
if (childrenAddress != 0) {
|
|
getWordsRec(childrenAddress, depth + 1, maxDepth, false, snr, inputIndex, diffs);
|
|
}
|
|
} else {
|
|
int j = 0;
|
|
while (currentChars[j] > 0) {
|
|
if (currentChars[j] == lowerC || currentChars[j] == c) {
|
|
int addedWeight = j == 0 ? mTypedLetterMultiplier : 1;
|
|
mWord[depth] = c;
|
|
if (mInputLength == inputIndex + 1) {
|
|
if (terminal) {
|
|
if (//INCLUDE_TYPED_WORD_IF_VALID ||
|
|
!sameAsTyped(mWord, depth + 1)) {
|
|
int finalFreq = freq * snr * addedWeight;
|
|
if (mSkipPos < 0) finalFreq *= mFullWordMultiplier;
|
|
addWord(mWord, depth + 1, finalFreq);
|
|
}
|
|
}
|
|
if (childrenAddress != 0) {
|
|
getWordsRec(childrenAddress, depth + 1,
|
|
maxDepth, true, snr * addedWeight, inputIndex + 1,
|
|
diffs + (j > 0));
|
|
}
|
|
} else if (childrenAddress != 0) {
|
|
getWordsRec(childrenAddress, depth + 1, maxDepth,
|
|
false, snr * addedWeight, inputIndex + 1, diffs + (j > 0));
|
|
}
|
|
}
|
|
j++;
|
|
if (mSkipPos >= 0) break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
int
|
|
Dictionary::getBigramAddress(int *pos, bool advance)
|
|
{
|
|
int address = 0;
|
|
|
|
address += (mDict[*pos] & 0x3F) << 16;
|
|
address += (mDict[*pos + 1] & 0xFF) << 8;
|
|
address += (mDict[*pos + 2] & 0xFF);
|
|
|
|
if (advance) {
|
|
*pos += 3;
|
|
}
|
|
|
|
return address;
|
|
}
|
|
|
|
int
|
|
Dictionary::getBigramFreq(int *pos)
|
|
{
|
|
int freq = mDict[(*pos)++] & FLAG_BIGRAM_FREQ;
|
|
|
|
return freq;
|
|
}
|
|
|
|
|
|
int
|
|
Dictionary::getBigrams(unsigned short *prevWord, int prevWordLength, int *codes, int codesSize,
|
|
unsigned short *bigramChars, int *bigramFreq, int maxWordLength, int maxBigrams,
|
|
int maxAlternatives)
|
|
{
|
|
mBigramFreq = bigramFreq;
|
|
mBigramChars = bigramChars;
|
|
mInputCodes = codes;
|
|
mInputLength = codesSize;
|
|
mMaxWordLength = maxWordLength;
|
|
mMaxBigrams = maxBigrams;
|
|
mMaxAlternatives = maxAlternatives;
|
|
|
|
if (mBigram == 1 && checkIfDictVersionIsLatest()) {
|
|
int pos = isValidWordRec(DICTIONARY_HEADER_SIZE, prevWord, 0, prevWordLength);
|
|
LOGI("Pos -> %d\n", pos);
|
|
if (pos < 0) {
|
|
return 0;
|
|
}
|
|
|
|
int bigramCount = 0;
|
|
int bigramExist = (mDict[pos] & FLAG_BIGRAM_READ);
|
|
if (bigramExist > 0) {
|
|
int nextBigramExist = 1;
|
|
while (nextBigramExist > 0 && bigramCount < maxBigrams) {
|
|
int bigramAddress = getBigramAddress(&pos, true);
|
|
int frequency = (FLAG_BIGRAM_FREQ & mDict[pos]);
|
|
// search for all bigrams and store them
|
|
searchForTerminalNode(bigramAddress, frequency);
|
|
nextBigramExist = (mDict[pos++] & FLAG_BIGRAM_CONTINUED);
|
|
bigramCount++;
|
|
}
|
|
}
|
|
|
|
return bigramCount;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
Dictionary::searchForTerminalNode(int addressLookingFor, int frequency)
|
|
{
|
|
// track word with such address and store it in an array
|
|
unsigned short word[mMaxWordLength];
|
|
|
|
int pos;
|
|
int followDownBranchAddress = DICTIONARY_HEADER_SIZE;
|
|
bool found = false;
|
|
char followingChar = ' ';
|
|
int depth = -1;
|
|
|
|
while(!found) {
|
|
bool followDownAddressSearchStop = false;
|
|
bool firstAddress = true;
|
|
bool haveToSearchAll = true;
|
|
|
|
if (depth >= 0) {
|
|
word[depth] = (unsigned short) followingChar;
|
|
}
|
|
pos = followDownBranchAddress; // pos start at count
|
|
int count = mDict[pos] & 0xFF;
|
|
LOGI("count - %d\n",count);
|
|
pos++;
|
|
for (int i = 0; i < count; i++) {
|
|
// pos at data
|
|
pos++;
|
|
// pos now at flag
|
|
if (!getFirstBitOfByte(&pos)) { // non-terminal
|
|
if (!followDownAddressSearchStop) {
|
|
int addr = getBigramAddress(&pos, false);
|
|
if (addr > addressLookingFor) {
|
|
followDownAddressSearchStop = true;
|
|
if (firstAddress) {
|
|
firstAddress = false;
|
|
haveToSearchAll = true;
|
|
} else if (!haveToSearchAll) {
|
|
break;
|
|
}
|
|
} else {
|
|
followDownBranchAddress = addr;
|
|
followingChar = (char)(0xFF & mDict[pos-1]);
|
|
if (firstAddress) {
|
|
firstAddress = false;
|
|
haveToSearchAll = false;
|
|
}
|
|
}
|
|
}
|
|
pos += 3;
|
|
} else if (getFirstBitOfByte(&pos)) { // terminal
|
|
if (addressLookingFor == (pos-1)) { // found !!
|
|
depth++;
|
|
word[depth] = (0xFF & mDict[pos-1]);
|
|
found = true;
|
|
break;
|
|
}
|
|
if (getSecondBitOfByte(&pos)) { // address + freq (4 byte)
|
|
if (!followDownAddressSearchStop) {
|
|
int addr = getBigramAddress(&pos, false);
|
|
if (addr > addressLookingFor) {
|
|
followDownAddressSearchStop = true;
|
|
if (firstAddress) {
|
|
firstAddress = false;
|
|
haveToSearchAll = true;
|
|
} else if (!haveToSearchAll) {
|
|
break;
|
|
}
|
|
} else {
|
|
followDownBranchAddress = addr;
|
|
followingChar = (char)(0xFF & mDict[pos-1]);
|
|
if (firstAddress) {
|
|
firstAddress = false;
|
|
haveToSearchAll = true;
|
|
}
|
|
}
|
|
}
|
|
pos += 4;
|
|
} else { // freq only (2 byte)
|
|
pos += 2;
|
|
}
|
|
|
|
// skipping bigram
|
|
int bigramExist = (mDict[pos] & FLAG_BIGRAM_READ);
|
|
if (bigramExist > 0) {
|
|
int nextBigramExist = 1;
|
|
while (nextBigramExist > 0) {
|
|
pos += 3;
|
|
nextBigramExist = (mDict[pos++] & FLAG_BIGRAM_CONTINUED);
|
|
}
|
|
} else {
|
|
pos++;
|
|
}
|
|
}
|
|
}
|
|
depth++;
|
|
if (followDownBranchAddress == 0) {
|
|
LOGI("ERROR!!! Cannot find bigram!!");
|
|
break;
|
|
}
|
|
}
|
|
if (checkFirstCharacter(word)) {
|
|
addWordBigram(word, depth, frequency);
|
|
}
|
|
}
|
|
|
|
bool
|
|
Dictionary::checkFirstCharacter(unsigned short *word)
|
|
{
|
|
// Checks whether this word starts with same character or neighboring characters of
|
|
// what user typed.
|
|
|
|
int *inputCodes = mInputCodes;
|
|
int maxAlt = mMaxAlternatives;
|
|
while (maxAlt > 0) {
|
|
if ((unsigned int) *inputCodes == (unsigned int) *word) {
|
|
return true;
|
|
}
|
|
inputCodes++;
|
|
maxAlt--;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
Dictionary::isValidWord(unsigned short *word, int length)
|
|
{
|
|
if (checkIfDictVersionIsLatest()) {
|
|
return (isValidWordRec(DICTIONARY_HEADER_SIZE, word, 0, length) != NOT_VALID_WORD);
|
|
} else {
|
|
return (isValidWordRec(0, word, 0, length) != NOT_VALID_WORD);
|
|
}
|
|
}
|
|
|
|
int
|
|
Dictionary::isValidWordRec(int pos, unsigned short *word, int offset, int length) {
|
|
// returns address of bigram data of that word
|
|
// return -99 if not found
|
|
|
|
int count = getCount(&pos);
|
|
unsigned short currentChar = (unsigned short) word[offset];
|
|
for (int j = 0; j < count; j++) {
|
|
unsigned short c = getChar(&pos);
|
|
int terminal = getTerminal(&pos);
|
|
int childPos = getAddress(&pos);
|
|
if (c == currentChar) {
|
|
if (offset == length - 1) {
|
|
if (terminal) {
|
|
return (pos+1);
|
|
}
|
|
} else {
|
|
if (childPos != 0) {
|
|
int t = isValidWordRec(childPos, word, offset + 1, length);
|
|
if (t > 0) {
|
|
return t;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (terminal) {
|
|
getFreq(&pos);
|
|
}
|
|
// There could be two instances of each alphabet - upper and lower case. So continue
|
|
// looking ...
|
|
}
|
|
return NOT_VALID_WORD;
|
|
}
|
|
|
|
|
|
} // namespace latinime
|