278 lines
8.3 KiB
C++
278 lines
8.3 KiB
C++
/*
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**
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** Copyright 2009, The Android Open Source Project
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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#include <stdio.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <string.h>
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#include <cutils/log.h>
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#include <unicode/uchar.h>
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//#define USE_ASSET_MANAGER
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#ifdef USE_ASSET_MANAGER
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#include <utils/AssetManager.h>
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#include <utils/Asset.h>
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#endif
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#include "dictionary.h"
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#include "basechars.h"
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#define DEBUG_DICT 0
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namespace latinime {
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Dictionary::Dictionary(void *dict, int typedLetterMultiplier, int fullWordMultiplier)
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{
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mDict = (unsigned char*) dict;
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mTypedLetterMultiplier = typedLetterMultiplier;
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mFullWordMultiplier = fullWordMultiplier;
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}
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Dictionary::~Dictionary()
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{
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}
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int Dictionary::getSuggestions(int *codes, int codesSize, unsigned short *outWords, int *frequencies,
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int maxWordLength, int maxWords, int maxAlternatives)
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{
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memset(frequencies, 0, maxWords * sizeof(*frequencies));
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memset(outWords, 0, maxWords * maxWordLength * sizeof(*outWords));
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mFrequencies = frequencies;
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mOutputChars = outWords;
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mInputCodes = codes;
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mInputLength = codesSize;
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mMaxAlternatives = maxAlternatives;
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mMaxWordLength = maxWordLength;
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mMaxWords = maxWords;
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mWords = 0;
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getWordsRec(0, 0, mInputLength * 3, false, 1, 0);
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if (DEBUG_DICT) LOGI("Returning %d words", mWords);
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return mWords;
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}
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unsigned short
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Dictionary::getChar(int *pos)
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{
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unsigned short ch = (unsigned short) (mDict[(*pos)++] & 0xFF);
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// If the code is 255, then actual 16 bit code follows (in big endian)
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if (ch == 0xFF) {
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ch = ((mDict[*pos] & 0xFF) << 8) | (mDict[*pos + 1] & 0xFF);
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(*pos) += 2;
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}
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return ch;
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}
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int
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Dictionary::getAddress(int *pos)
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{
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int address = 0;
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address += (mDict[*pos] & 0x7F) << 16;
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address += (mDict[*pos + 1] & 0xFF) << 8;
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address += (mDict[*pos + 2] & 0xFF);
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*pos += 3;
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return address;
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}
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int
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Dictionary::wideStrLen(unsigned short *str)
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{
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if (!str) return 0;
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unsigned short *end = str;
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while (*end)
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end++;
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return end - str;
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}
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bool
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Dictionary::addWord(unsigned short *word, int length, int frequency)
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{
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word[length] = 0;
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if (DEBUG_DICT) LOGI("Found word = %s, freq = %d : \n", word, frequency);
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// Find the right insertion point
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int insertAt = 0;
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while (insertAt < mMaxWords) {
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if (frequency > mFrequencies[insertAt]
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|| (mFrequencies[insertAt] == frequency
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&& length < wideStrLen(mOutputChars + insertAt * mMaxWordLength))) {
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break;
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}
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insertAt++;
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}
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if (insertAt < mMaxWords) {
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memmove((char*) mFrequencies + (insertAt + 1) * sizeof(mFrequencies[0]),
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(char*) mFrequencies + insertAt * sizeof(mFrequencies[0]),
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(mMaxWords - insertAt - 1) * sizeof(mFrequencies[0]));
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mFrequencies[insertAt] = frequency;
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memmove((char*) mOutputChars + (insertAt + 1) * mMaxWordLength * sizeof(short),
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(char*) mOutputChars + (insertAt ) * mMaxWordLength * sizeof(short),
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(mMaxWords - insertAt - 1) * sizeof(short) * mMaxWordLength);
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unsigned short *dest = mOutputChars + (insertAt ) * mMaxWordLength;
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while (length--) {
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*dest++ = *word++;
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}
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*dest = 0; // NULL terminate
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// Update the word count
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if (insertAt + 1 > mWords) mWords = insertAt + 1;
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if (DEBUG_DICT) LOGI("Added word at %d\n", insertAt);
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return true;
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}
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return false;
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}
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unsigned short
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Dictionary::toLowerCase(unsigned short c, const int depth) {
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if (c < sizeof(BASE_CHARS) / sizeof(BASE_CHARS[0])) {
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c = BASE_CHARS[c];
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}
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if (depth == 0) {
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if (c >='A' && c <= 'Z') {
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c |= 32;
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} else if (c > 127) {
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c = u_tolower(c);
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}
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}
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return c;
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}
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bool
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Dictionary::sameAsTyped(unsigned short *word, int length)
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{
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if (length != mInputLength) {
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return false;
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}
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int *inputCodes = mInputCodes;
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while (length--) {
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if ((unsigned int) *inputCodes != (unsigned int) *word) {
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return false;
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}
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inputCodes += mMaxAlternatives;
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word++;
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}
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return true;
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}
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static char QUOTE = '\'';
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void
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Dictionary::getWordsRec(int pos, int depth, int maxDepth, bool completion, int snr, int inputIndex)
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{
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// Optimization: Prune out words that are too long compared to how much was typed.
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if (depth > maxDepth) {
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return;
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}
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int count = getCount(&pos);
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int *currentChars = NULL;
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if (mInputLength <= inputIndex) {
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completion = true;
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} else {
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currentChars = mInputCodes + (inputIndex * mMaxAlternatives);
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}
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for (int i = 0; i < count; i++) {
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unsigned short c = getChar(&pos);
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unsigned short lowerC = toLowerCase(c, depth);
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bool terminal = getTerminal(&pos);
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int childrenAddress = getAddress(&pos);
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int freq = getFreq(&pos);
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// If we are only doing completions, no need to look at the typed characters.
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if (completion) {
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mWord[depth] = c;
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if (terminal) {
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addWord(mWord, depth + 1, freq * snr);
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}
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if (childrenAddress != 0) {
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getWordsRec(childrenAddress, depth + 1, maxDepth,
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completion, snr, inputIndex);
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}
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} else if (c == QUOTE && currentChars[0] != QUOTE) {
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// Skip the ' and continue deeper
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mWord[depth] = QUOTE;
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if (childrenAddress != 0) {
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getWordsRec(childrenAddress, depth + 1, maxDepth, false, snr, inputIndex);
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}
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} else {
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int j = 0;
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while (currentChars[j] > 0) {
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int addedWeight = j == 0 ? mTypedLetterMultiplier : 1;
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if (currentChars[j] == lowerC || currentChars[j] == c) {
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mWord[depth] = c;
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if (mInputLength == inputIndex + 1) {
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if (terminal) {
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if (//INCLUDE_TYPED_WORD_IF_VALID ||
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!sameAsTyped(mWord, depth + 1)) {
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addWord(mWord, depth + 1,
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(freq * snr * addedWeight * mFullWordMultiplier));
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}
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}
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if (childrenAddress != 0) {
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getWordsRec(childrenAddress, depth + 1,
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maxDepth, true, snr * addedWeight, inputIndex + 1);
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}
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} else if (childrenAddress != 0) {
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getWordsRec(childrenAddress, depth + 1, maxDepth,
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false, snr * addedWeight, inputIndex + 1);
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}
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}
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j++;
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}
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}
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}
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}
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bool
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Dictionary::isValidWord(unsigned short *word, int length)
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{
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return isValidWordRec(0, word, 0, length);
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}
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bool
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Dictionary::isValidWordRec(int pos, unsigned short *word, int offset, int length) {
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int count = getCount(&pos);
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unsigned short currentChar = (unsigned short) word[offset];
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for (int j = 0; j < count; j++) {
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unsigned short c = getChar(&pos);
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int terminal = getTerminal(&pos);
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int childPos = getAddress(&pos);
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if (c == currentChar) {
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if (offset == length - 1) {
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if (terminal) {
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return true;
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}
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} else {
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if (childPos != 0) {
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if (isValidWordRec(childPos, word, offset + 1, length)) {
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return true;
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}
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}
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}
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}
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getFreq(&pos);
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// There could be two instances of each alphabet - upper and lower case. So continue
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// looking ...
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}
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return false;
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}
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} // namespace latinime
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