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/*
* Copyright (C) 2012 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_PROXIMITY_INFO_STATE_H
#define LATINIME_PROXIMITY_INFO_STATE_H
#include <assert.h>
#include <stdint.h>
#include <string>
#include "additional_proximity_chars.h"
#include "char_utils.h"
#include "defines.h"
namespace latinime {
class ProximityInfo;
class ProximityInfoState {
public:
static const int NORMALIZED_SQUARED_DISTANCE_SCALING_FACTOR_LOG_2 = 10;
static const int NORMALIZED_SQUARED_DISTANCE_SCALING_FACTOR =
1 << NORMALIZED_SQUARED_DISTANCE_SCALING_FACTOR_LOG_2;
// The upper limit of the char code in mCodeToKeyIndex
static const int MAX_CHAR_CODE = 127;
static const float NOT_A_DISTANCE_FLOAT = -1.0f;
static const int NOT_A_CODE = -1;
/////////////////////////////////////////
// Defined in proximity_info_state.cpp //
/////////////////////////////////////////
void initInputParams(
const ProximityInfo* proximityInfo, const int32_t* inputCodes, const int inputLength,
const int* xCoordinates, const int* yCoordinates);
/////////////////////////////////////////
// Defined here //
/////////////////////////////////////////
inline const int* getProximityCharsAt(const int index) const {
return mInputCodes + (index * MAX_PROXIMITY_CHARS_SIZE_INTERNAL);
}
inline unsigned short getPrimaryCharAt(const int index) const {
return getProximityCharsAt(index)[0];
}
inline bool existsCharInProximityAt(const int index, const int c) const {
const int *chars = getProximityCharsAt(index);
int i = 0;
while (chars[i] > 0 && i < MAX_PROXIMITY_CHARS_SIZE_INTERNAL) {
if (chars[i++] == c) {
return true;
}
}
return false;
}
inline bool existsAdjacentProximityChars(const int index) const {
if (index < 0 || index >= mInputLength) return false;
const int currentChar = getPrimaryCharAt(index);
const int leftIndex = index - 1;
if (leftIndex >= 0 && existsCharInProximityAt(leftIndex, currentChar)) {
return true;
}
const int rightIndex = index + 1;
if (rightIndex < mInputLength && existsCharInProximityAt(rightIndex, currentChar)) {
return true;
}
return false;
}
// In the following function, c is the current character of the dictionary word
// currently examined.
// currentChars is an array containing the keys close to the character the
// user actually typed at the same position. We want to see if c is in it: if so,
// then the word contains at that position a character close to what the user
// typed.
// What the user typed is actually the first character of the array.
// proximityIndex is a pointer to the variable where getMatchedProximityId returns
// the index of c in the proximity chars of the input index.
// Notice : accented characters do not have a proximity list, so they are alone
// in their list. The non-accented version of the character should be considered
// "close", but not the other keys close to the non-accented version.
inline ProximityType getMatchedProximityId(const int index,
const unsigned short c, const bool checkProximityChars, int *proximityIndex = 0) const {
const int *currentChars = getProximityCharsAt(index);
const int firstChar = currentChars[0];
const unsigned short baseLowerC = toBaseLowerCase(c);
// The first char in the array is what user typed. If it matches right away,
// that means the user typed that same char for this pos.
if (firstChar == baseLowerC || firstChar == c) {
return EQUIVALENT_CHAR;
}
if (!checkProximityChars) return UNRELATED_CHAR;
// If the non-accented, lowercased version of that first character matches c,
// then we have a non-accented version of the accented character the user
// typed. Treat it as a close char.
if (toBaseLowerCase(firstChar) == baseLowerC)
return NEAR_PROXIMITY_CHAR;
// Not an exact nor an accent-alike match: search the list of close keys
int j = 1;
while (j < MAX_PROXIMITY_CHARS_SIZE_INTERNAL
&& currentChars[j] > ADDITIONAL_PROXIMITY_CHAR_DELIMITER_CODE) {
const bool matched = (currentChars[j] == baseLowerC || currentChars[j] == c);
if (matched) {
if (proximityIndex) {
*proximityIndex = j;
}
return NEAR_PROXIMITY_CHAR;
}
++j;
}
if (j < MAX_PROXIMITY_CHARS_SIZE_INTERNAL
&& currentChars[j] == ADDITIONAL_PROXIMITY_CHAR_DELIMITER_CODE) {
++j;
while (j < MAX_PROXIMITY_CHARS_SIZE_INTERNAL
&& currentChars[j] > ADDITIONAL_PROXIMITY_CHAR_DELIMITER_CODE) {
const bool matched = (currentChars[j] == baseLowerC || currentChars[j] == c);
if (matched) {
if (proximityIndex) {
*proximityIndex = j;
}
return ADDITIONAL_PROXIMITY_CHAR;
}
++j;
}
}
// Was not included, signal this as an unrelated character.
return UNRELATED_CHAR;
}
inline int getNormalizedSquaredDistance(
const int inputIndex, const int proximityIndex) const {
return mNormalizedSquaredDistances[
inputIndex * MAX_PROXIMITY_CHARS_SIZE_INTERNAL + proximityIndex];
}
inline const unsigned short* getPrimaryInputWord() const {
return mPrimaryInputWord;
}
inline bool touchPositionCorrectionEnabled() const {
return mTouchPositionCorrectionEnabled;
}
private:
/////////////////////////////////////////
// Defined in proximity_info_state.cpp //
/////////////////////////////////////////
float calculateNormalizedSquaredDistance(const int keyIndex, const int inputIndex) const;
float calculateSquaredDistanceFromSweetSpotCenter(
const int keyIndex, const int inputIndex) const;
/////////////////////////////////////////
// Defined here //
/////////////////////////////////////////
inline float square(const float x) const { return x * x; }
bool hasInputCoordinates() const {
return mInputXCoordinates && mInputYCoordinates;
}
bool sameAsTyped(const unsigned short *word, int length) const {
if (length != mInputLength) {
return false;
}
const int *inputCodes = mInputCodes;
while (length--) {
if ((unsigned int) *inputCodes != (unsigned int) *word) {
return false;
}
inputCodes += MAX_PROXIMITY_CHARS_SIZE_INTERNAL;
word++;
}
return true;
}
// const
const ProximityInfo *mProximityInfo;
bool mHasTouchPositionCorrectionData;
int mMostCommonKeyWidthSquare;
std::string mLocaleStr;
int mKeyCount;
int mCellHeight;
int mCellWidth;
int mGridHeight;
int mGridWidth;
const int *mInputXCoordinates;
const int *mInputYCoordinates;
bool mTouchPositionCorrectionEnabled;
int32_t mInputCodes[MAX_PROXIMITY_CHARS_SIZE_INTERNAL * MAX_WORD_LENGTH_INTERNAL];
int mNormalizedSquaredDistances[MAX_PROXIMITY_CHARS_SIZE_INTERNAL * MAX_WORD_LENGTH_INTERNAL];
int mInputLength;
unsigned short mPrimaryInputWord[MAX_WORD_LENGTH_INTERNAL];
};
} // namespace latinime
#endif // LATINIME_PROXIMITY_INFO_STATE_H
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