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Add DigraphUtils class

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Add a new DigraphUtils class to manage digraph handling for both
gesture and typing input.

Bug: 8493920
Change-Id: I3a509e1311b9039653f9f488d3c28bb54205f416
This commit is contained in:
Tom Ouyang 2013-04-02 17:21:08 -07:00
parent 868805aec4
commit 2fdf5b70ad
5 changed files with 153 additions and 29 deletions
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1
native/jni/Android.mk
View file

@ -59,6 +59,7 @@ LATIN_IME_CORE_SRC_FILES := \
correction.cpp \
dictionary.cpp \
dic_traverse_wrapper.cpp \
digraph_utils.cpp \
proximity_info.cpp \
proximity_info_params.cpp \
proximity_info_state.cpp \

93
native/jni/src/digraph_utils.cpp Normal file
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@ -0,0 +1,93 @@
/*
* Copyright (C) 2013 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 "binary_format.h"
#include "defines.h"
#include "digraph_utils.h"
namespace latinime {
const DigraphUtils::digraph_t DigraphUtils::GERMAN_UMLAUT_DIGRAPHS[] =
{ { 'a', 'e', 0x00E4 }, // U+00E4 : LATIN SMALL LETTER A WITH DIAERESIS
{ 'o', 'e', 0x00F6 }, // U+00F6 : LATIN SMALL LETTER O WITH DIAERESIS
{ 'u', 'e', 0x00FC } }; // U+00FC : LATIN SMALL LETTER U WITH DIAERESIS
const DigraphUtils::digraph_t DigraphUtils::FRENCH_LIGATURES_DIGRAPHS[] =
{ { 'a', 'e', 0x00E6 }, // U+00E6 : LATIN SMALL LETTER AE
{ 'o', 'e', 0x0153 } }; // U+0153 : LATIN SMALL LIGATURE OE
/* static */ bool DigraphUtils::hasDigraphForCodePoint(
const int dictFlags, const int compositeGlyphCodePoint) {
if (DigraphUtils::getDigraphForCodePoint(dictFlags, compositeGlyphCodePoint)) {
return true;
}
return false;
}
// Retrieves the set of all digraphs associated with the given dictionary.
// Returns the size of the digraph array, or 0 if none exist.
/* static */ int DigraphUtils::getAllDigraphsForDictionaryAndReturnSize(
const int dictFlags, const DigraphUtils::digraph_t **digraphs) {
if (BinaryFormat::REQUIRES_GERMAN_UMLAUT_PROCESSING & dictFlags) {
*digraphs = DigraphUtils::GERMAN_UMLAUT_DIGRAPHS;
return NELEMS(DigraphUtils::GERMAN_UMLAUT_DIGRAPHS);
}
if (BinaryFormat::REQUIRES_FRENCH_LIGATURES_PROCESSING & dictFlags) {
*digraphs = DigraphUtils::FRENCH_LIGATURES_DIGRAPHS;
return NELEMS(DigraphUtils::FRENCH_LIGATURES_DIGRAPHS);
}
return 0;
}
// Returns the digraph codepoint for the given composite glyph codepoint and digraph codepoint index
// (which specifies the first or second codepoint in the digraph).
/* static */ int DigraphUtils::getDigraphCodePointForIndex(const int dictFlags,
const int compositeGlyphCodePoint, const DigraphCodePointIndex digraphCodePointIndex) {
if (digraphCodePointIndex == NOT_A_DIGRAPH_INDEX) {
return NOT_A_CODE_POINT;
}
const DigraphUtils::digraph_t *digraph =
DigraphUtils::getDigraphForCodePoint(dictFlags, compositeGlyphCodePoint);
if (!digraph) {
return NOT_A_CODE_POINT;
}
if (digraphCodePointIndex == FIRST_DIGRAPH_CODEPOINT) {
return digraph->first;
} else if (digraphCodePointIndex == SECOND_DIGRAPH_CODEPOINT) {
return digraph->second;
}
ASSERT(false);
return NOT_A_CODE_POINT;
}
/**
* Returns the digraph for the input composite glyph codepoint, or 0 if none exists.
* dictFlags: the dictionary flags needed to determine which digraphs are supported.
* compositeGlyphCodePoint: the method returns the digraph corresponding to this codepoint.
*/
/* static */ const DigraphUtils::digraph_t *DigraphUtils::getDigraphForCodePoint(
const int dictFlags, const int compositeGlyphCodePoint) {
const DigraphUtils::digraph_t *digraphs = 0;
const int digraphsSize =
DigraphUtils::getAllDigraphsForDictionaryAndReturnSize(dictFlags, &digraphs);
for (int i = 0; i < digraphsSize; i++) {
if (digraphs[i].compositeGlyph == compositeGlyphCodePoint) {
return &digraphs[i];
}
}
return 0;
}
} // namespace latinime

47
native/jni/src/digraph_utils.h Normal file
View file

@ -0,0 +1,47 @@
/*
* Copyright (C) 2013 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 DIGRAPH_UTILS_H
#define DIGRAPH_UTILS_H
namespace latinime {
class DigraphUtils {
public:
typedef enum {
NOT_A_DIGRAPH_INDEX,
FIRST_DIGRAPH_CODEPOINT,
SECOND_DIGRAPH_CODEPOINT
} DigraphCodePointIndex;
typedef struct { int first; int second; int compositeGlyph; } digraph_t;
static bool hasDigraphForCodePoint(const int dictFlags, const int compositeGlyphCodePoint);
static int getAllDigraphsForDictionaryAndReturnSize(
const int dictFlags, const digraph_t **digraphs);
static int getDigraphCodePointForIndex(const int dictFlags, const int compositeGlyphCodePoint,
const DigraphCodePointIndex digraphCodePointIndex);
private:
DISALLOW_IMPLICIT_CONSTRUCTORS(DigraphUtils);
static const digraph_t *getDigraphForCodePoint(
const int dictFlags, const int compositeGlyphCodePoint);
static const digraph_t GERMAN_UMLAUT_DIGRAPHS[];
static const digraph_t FRENCH_LIGATURES_DIGRAPHS[];
};
} // namespace latinime
#endif // DIGRAPH_UTILS_H

31
native/jni/src/unigram_dictionary.cpp
View file

@ -22,6 +22,7 @@
#include "char_utils.h"
#include "defines.h"
#include "dictionary.h"
#include "digraph_utils.h"
#include "proximity_info.h"
#include "terminal_attributes.h"
#include "unigram_dictionary.h"
@ -30,15 +31,6 @@
namespace latinime {
const UnigramDictionary::digraph_t UnigramDictionary::GERMAN_UMLAUT_DIGRAPHS[] =
{ { 'a', 'e', 0x00E4 }, // U+00E4 : LATIN SMALL LETTER A WITH DIAERESIS
{ 'o', 'e', 0x00F6 }, // U+00F6 : LATIN SMALL LETTER O WITH DIAERESIS
{ 'u', 'e', 0x00FC } }; // U+00FC : LATIN SMALL LETTER U WITH DIAERESIS
const UnigramDictionary::digraph_t UnigramDictionary::FRENCH_LIGATURES_DIGRAPHS[] =
{ { 'a', 'e', 0x00E6 }, // U+00E6 : LATIN SMALL LETTER AE
{ 'o', 'e', 0x0153 } }; // U+0153 : LATIN SMALL LIGATURE OE
// TODO: check the header
UnigramDictionary::UnigramDictionary(const uint8_t *const streamStart, const unsigned int flags)
: DICT_ROOT(streamStart), ROOT_POS(0),
@ -58,7 +50,7 @@ static void addWord(int *word, int length, int probability, WordsPriorityQueue *
// Return the replacement code point for a digraph, or 0 if none.
int UnigramDictionary::getDigraphReplacement(const int *codes, const int i, const int inputSize,
const digraph_t *const digraphs, const unsigned int digraphsSize) const {
const DigraphUtils::digraph_t *const digraphs, const unsigned int digraphsSize) const {
// There can't be a digraph if we don't have at least 2 characters to examine
if (i + 2 > inputSize) return false;
@ -74,7 +66,7 @@ int UnigramDictionary::getDigraphReplacement(const int *codes, const int i, cons
// It's an interesting digraph if the second char matches too.
if (digraphs[lastDigraphIndex].second == codes[i + 1]) {
return digraphs[lastDigraphIndex].replacement;
return digraphs[lastDigraphIndex].compositeGlyph;
} else {
return 0;
}
@ -93,7 +85,7 @@ void UnigramDictionary::getWordWithDigraphSuggestionsRec(ProximityInfo *proximit
const bool useFullEditDistance, const int *codesSrc,
const int codesRemain, const int currentDepth, int *codesDest, Correction *correction,
WordsPriorityQueuePool *queuePool,
const digraph_t *const digraphs, const unsigned int digraphsSize) const {
const DigraphUtils::digraph_t *const digraphs, const unsigned int digraphsSize) const {
ASSERT(sizeof(codesDest[0]) == sizeof(codesSrc[0]));
ASSERT(sizeof(xCoordinatesBuffer[0]) == sizeof(xcoordinates[0]));
ASSERT(sizeof(yCoordinatesBuffer[0]) == sizeof(ycoordinates[0]));
@ -169,7 +161,10 @@ int UnigramDictionary::getSuggestions(ProximityInfo *proximityInfo, const int *x
queuePool.clearAll();
Correction masterCorrection;
masterCorrection.resetCorrection();
if (BinaryFormat::REQUIRES_GERMAN_UMLAUT_PROCESSING & FLAGS)
const DigraphUtils::digraph_t *digraphs = 0;
const int digraphsSize =
DigraphUtils::getAllDigraphsForDictionaryAndReturnSize(FLAGS, &digraphs);
if (digraphsSize > 0)
{ // Incrementally tune the word and try all possibilities
int codesBuffer[sizeof(*inputCodePoints) * inputSize];
int xCoordinatesBuffer[inputSize];
@ -177,15 +172,7 @@ int UnigramDictionary::getSuggestions(ProximityInfo *proximityInfo, const int *x
getWordWithDigraphSuggestionsRec(proximityInfo, xcoordinates, ycoordinates, codesBuffer,
xCoordinatesBuffer, yCoordinatesBuffer, inputSize, bigramMap, bigramFilter,
useFullEditDistance, inputCodePoints, inputSize, 0, codesBuffer, &masterCorrection,
&queuePool, GERMAN_UMLAUT_DIGRAPHS, NELEMS(GERMAN_UMLAUT_DIGRAPHS));
} else if (BinaryFormat::REQUIRES_FRENCH_LIGATURES_PROCESSING & FLAGS) {
int codesBuffer[sizeof(*inputCodePoints) * inputSize];
int xCoordinatesBuffer[inputSize];
int yCoordinatesBuffer[inputSize];
getWordWithDigraphSuggestionsRec(proximityInfo, xcoordinates, ycoordinates, codesBuffer,
xCoordinatesBuffer, yCoordinatesBuffer, inputSize, bigramMap, bigramFilter,
useFullEditDistance, inputCodePoints, inputSize, 0, codesBuffer, &masterCorrection,
&queuePool, FRENCH_LIGATURES_DIGRAPHS, NELEMS(FRENCH_LIGATURES_DIGRAPHS));
&queuePool, digraphs, digraphsSize);
} else { // Normal processing
getWordSuggestions(proximityInfo, xcoordinates, ycoordinates, inputCodePoints, inputSize,
bigramMap, bigramFilter, useFullEditDistance, &masterCorrection, &queuePool);

10
native/jni/src/unigram_dictionary.h
View file

@ -20,6 +20,7 @@
#include <map>
#include <stdint.h>
#include "defines.h"
#include "digraph_utils.h"
namespace latinime {
@ -29,8 +30,6 @@ class TerminalAttributes;
class WordsPriorityQueuePool;
class UnigramDictionary {
typedef struct { int first; int second; int replacement; } digraph_t;
public:
// Error tolerances
static const int DEFAULT_MAX_ERRORS = 2;
@ -57,13 +56,13 @@ class UnigramDictionary {
const bool useFullEditDistance, Correction *correction,
WordsPriorityQueuePool *queuePool) const;
int getDigraphReplacement(const int *codes, const int i, const int inputSize,
const digraph_t *const digraphs, const unsigned int digraphsSize) const;
const DigraphUtils::digraph_t *const digraphs, const unsigned int digraphsSize) const;
void getWordWithDigraphSuggestionsRec(ProximityInfo *proximityInfo, const int *xcoordinates,
const int *ycoordinates, const int *codesBuffer, int *xCoordinatesBuffer,
int *yCoordinatesBuffer, const int codesBufferSize, const std::map<int, int> *bigramMap,
const uint8_t *bigramFilter, const bool useFullEditDistance, const int *codesSrc,
const int codesRemain, const int currentDepth, int *codesDest, Correction *correction,
WordsPriorityQueuePool *queuePool, const digraph_t *const digraphs,
WordsPriorityQueuePool *queuePool, const DigraphUtils::digraph_t *const digraphs,
const unsigned int digraphsSize) const;
void initSuggestions(ProximityInfo *proximityInfo, const int *xcoordinates,
const int *ycoordinates, const int *codes, const int inputSize,
@ -111,9 +110,6 @@ class UnigramDictionary {
const int ROOT_POS;
const int MAX_DIGRAPH_SEARCH_DEPTH;
const int FLAGS;
static const digraph_t GERMAN_UMLAUT_DIGRAPHS[];
static const digraph_t FRENCH_LIGATURES_DIGRAPHS[];
};
} // namespace latinime
#endif // LATINIME_UNIGRAM_DICTIONARY_H