Utf8Utils for dicttoolkit.
Bug: 10059681 Change-Id: Ie484ba8096823792f0ac663524d1c02d1be070e9main
Keisuke Kuroyanagi
parent
cd10540973
commit
f0c303dd02
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@ -24,11 +24,14 @@ LATIN_IME_DICT_TOOLKIT_SRC_FILES := \
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makedict_executor.cpp) \
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$(addprefix offdevice_intermediate_dict/, \
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offdevice_intermediate_dict.cpp) \
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utils/command_utils.cpp
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$(addprefix utils/, \
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command_utils.cpp \
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utf8_utils.cpp)
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LATIN_IME_DICT_TOOLKIT_TEST_FILES := \
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dict_toolkit_defines_test.cpp \
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$(addprefix offdevice_intermediate_dict/, \
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offdevice_intermediate_dict_test.cpp) \
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$(addprefix utils/, \
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command_utils_test.cpp)
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command_utils_test.cpp \
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utf8_utils_test.cpp)
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@ -0,0 +1,119 @@
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/*
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* Copyright (C) 2014 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 "utils/utf8_utils.h"
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#include "utils/char_utils.h"
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namespace latinime {
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namespace dicttoolkit {
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const size_t Utf8Utils::MAX_SEQUENCE_SIZE_FOR_A_CODE_POINT = 4;
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const uint8_t Utf8Utils::FIRST_BYTE_MARKER_MASKS[] = {0, 0x80, 0xE0, 0xF0, 0xF8};
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const uint8_t Utf8Utils::FIRST_BYTE_MARKERS[] = {0, 0x00, 0xC0, 0xE0, 0xF0};
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const uint8_t Utf8Utils::FIRST_BYTE_CODE_POINT_BITS_MASKS[] = {0, 0x7F, 0x1F, 0x0F, 0x03};
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const int Utf8Utils::MAX_ENCODED_CODE_POINT_VALUES[] = {-1, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
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const uint8_t Utf8Utils::TRAILING_BYTE_CODE_POINT_BITS_MASK = 0x3F;
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const uint8_t Utf8Utils::TRAILING_BYTE_MARKER = 0x80;
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const size_t Utf8Utils::CODE_POINT_BIT_COUNT_IN_TRAILING_BYTE = 6;
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/* static */ std::vector<int> Utf8Utils::getCodePoints(const std::string &utf8Str) {
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std::vector<int> codePoints;
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int remainingByteCountForCurrentCodePoint = 0;
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int currentCodePointSequenceSize = 0;
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int codePoint = 0;
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for (const char c : utf8Str) {
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if (remainingByteCountForCurrentCodePoint == 0) {
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currentCodePointSequenceSize = getSequenceSizeByCheckingFirstByte(c);
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if (currentCodePointSequenceSize <= 0) {
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AKLOGE("%x is an invalid utf8 first byte value.", c);
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return std::vector<int>();
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}
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remainingByteCountForCurrentCodePoint = currentCodePointSequenceSize;
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codePoint = maskFirstByte(c, remainingByteCountForCurrentCodePoint);
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} else {
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codePoint <<= CODE_POINT_BIT_COUNT_IN_TRAILING_BYTE;
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codePoint += maskTrailingByte(c);
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}
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remainingByteCountForCurrentCodePoint--;
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if (remainingByteCountForCurrentCodePoint == 0) {
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if (codePoint <= MAX_ENCODED_CODE_POINT_VALUES[currentCodePointSequenceSize - 1]) {
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AKLOGE("%d bytes encode for codePoint(%x) is a redundant UTF-8 sequence.",
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currentCodePointSequenceSize, codePoint);
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return std::vector<int>();
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}
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codePoints.push_back(codePoint);
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}
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}
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return codePoints;
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}
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/* static */ int Utf8Utils::getSequenceSizeByCheckingFirstByte(const uint8_t firstByte) {
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for (size_t i = 1; i <= MAX_SEQUENCE_SIZE_FOR_A_CODE_POINT; ++i) {
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if ((firstByte & FIRST_BYTE_MARKER_MASKS[i]) == FIRST_BYTE_MARKERS[i]) {
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return i;
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}
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}
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// Not a valid utf8 char first byte.
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return -1;
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}
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/* static */ AK_FORCE_INLINE int Utf8Utils::maskFirstByte(const uint8_t firstByte,
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const int sequenceSize) {
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return firstByte & FIRST_BYTE_CODE_POINT_BITS_MASKS[sequenceSize];
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}
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/* static */ AK_FORCE_INLINE int Utf8Utils::maskTrailingByte(const uint8_t secondOrLaterByte) {
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return secondOrLaterByte & TRAILING_BYTE_CODE_POINT_BITS_MASK;
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}
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/* static */ std::string Utf8Utils::getUtf8String(const CodePointArrayView codePoints) {
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std::string utf8String;
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for (const int codePoint : codePoints) {
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const int sequenceSize = getSequenceSizeToEncodeCodePoint(codePoint);
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if (sequenceSize <= 0) {
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AKLOGE("Cannot encode code point (%d).", codePoint);
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return std::string();
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}
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const int trailingByteCount = sequenceSize - 1;
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// Output first byte.
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const int value = codePoint >> (trailingByteCount * CODE_POINT_BIT_COUNT_IN_TRAILING_BYTE);
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utf8String.push_back(static_cast<char>(value | FIRST_BYTE_MARKERS[sequenceSize]));
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// Output second and later bytes.
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for (int i = 1; i < sequenceSize; ++i) {
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const int shiftAmount = (trailingByteCount - i) * CODE_POINT_BIT_COUNT_IN_TRAILING_BYTE;
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const int value = (codePoint >> shiftAmount) & TRAILING_BYTE_CODE_POINT_BITS_MASK;
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utf8String.push_back(static_cast<char>(value | TRAILING_BYTE_MARKER));
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}
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}
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return utf8String;
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}
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/* static */ int Utf8Utils::getSequenceSizeToEncodeCodePoint(const int codePoint) {
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if (codePoint < 0) {
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return -1;
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}
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for (size_t i = 1; i <= MAX_SEQUENCE_SIZE_FOR_A_CODE_POINT; ++i) {
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if (codePoint <= MAX_ENCODED_CODE_POINT_VALUES[i]) {
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return i;
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}
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}
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return -1;
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}
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} // namespace dicttoolkit
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} // namespace latinime
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@ -0,0 +1,56 @@
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/*
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* Copyright (C) 2014 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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#ifndef LATINIME_DICT_TOOLKIT_UTF8_UTILS_H
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#define LATINIME_DICT_TOOLKIT_UTF8_UTILS_H
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#include <cstdint>
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#include <string>
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#include <vector>
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#include "dict_toolkit_defines.h"
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#include "utils/int_array_view.h"
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namespace latinime {
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namespace dicttoolkit {
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class Utf8Utils {
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public:
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static std::vector<int> getCodePoints(const std::string &utf8Str);
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static std::string getUtf8String(const CodePointArrayView codePoints);
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private:
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DISALLOW_IMPLICIT_CONSTRUCTORS(Utf8Utils);
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// Values indexed by sequence size.
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static const size_t MAX_SEQUENCE_SIZE_FOR_A_CODE_POINT;
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static const uint8_t FIRST_BYTE_MARKER_MASKS[];
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static const uint8_t FIRST_BYTE_MARKERS[];
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static const uint8_t FIRST_BYTE_CODE_POINT_BITS_MASKS[];
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static const int MAX_ENCODED_CODE_POINT_VALUES[];
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static const uint8_t TRAILING_BYTE_CODE_POINT_BITS_MASK;
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static const uint8_t TRAILING_BYTE_MARKER;
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static const size_t CODE_POINT_BIT_COUNT_IN_TRAILING_BYTE;
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static int getSequenceSizeByCheckingFirstByte(const uint8_t firstByte);
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static int maskFirstByte(const uint8_t firstByte, const int encodeSize);
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static int maskTrailingByte(const uint8_t secondOrLaterByte);
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static int getSequenceSizeToEncodeCodePoint(const int codePoint);
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};
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} // namespace dicttoolkit
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} // namespace latinime
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#endif // LATINIME_DICT_TOOLKIT_UTF8_UTILS_H
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@ -0,0 +1,85 @@
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/*
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* Copyright (C) 2014 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 "utils/utf8_utils.h"
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#include <gtest/gtest.h>
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#include <vector>
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#include "utils/int_array_view.h"
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namespace latinime {
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namespace dicttoolkit {
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namespace {
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TEST(Utf8UtilsTests, TestGetCodePoints) {
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{
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const std::vector<int> codePoints = Utf8Utils::getCodePoints("");
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EXPECT_EQ(0u, codePoints.size());
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}
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{
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const std::vector<int> codePoints = Utf8Utils::getCodePoints("test");
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EXPECT_EQ(4u, codePoints.size());
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EXPECT_EQ('t', codePoints[0]);
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EXPECT_EQ('e', codePoints[1]);
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EXPECT_EQ('s', codePoints[2]);
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EXPECT_EQ('t', codePoints[3]);
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}
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{
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const std::vector<int> codePoints = Utf8Utils::getCodePoints(u8"\u3042a\u03C2\u0410");
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EXPECT_EQ(4u, codePoints.size());
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EXPECT_EQ(0x3042, codePoints[0]); // HIRAGANA LETTER A
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EXPECT_EQ('a', codePoints[1]);
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EXPECT_EQ(0x03C2, codePoints[2]); // CYRILLIC CAPITAL LETTER A
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EXPECT_EQ(0x0410, codePoints[3]); // GREEK SMALL LETTER FINAL SIGMA
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}
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{
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const std::vector<int> codePoints = Utf8Utils::getCodePoints(u8"\U0001F36A?\U0001F752");
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EXPECT_EQ(3u, codePoints.size());
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EXPECT_EQ(0x1F36A, codePoints[0]); // COOKIE
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EXPECT_EQ('?', codePoints[1]);
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EXPECT_EQ(0x1F752, codePoints[2]); // ALCHEMICAL SYMBOL FOR STARRED TRIDENT
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}
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// Redundant UTF-8 sequences must be rejected.
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EXPECT_TRUE(Utf8Utils::getCodePoints("\xC0\xAF").empty());
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EXPECT_TRUE(Utf8Utils::getCodePoints("\xE0\x80\xAF").empty());
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EXPECT_TRUE(Utf8Utils::getCodePoints("\xF0\x80\x80\xAF").empty());
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}
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TEST(Utf8UtilsTests, TestGetUtf8String) {
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{
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const std::vector<int> codePoints = {'t', 'e', 's', 't'};
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EXPECT_EQ("test", Utf8Utils::getUtf8String(CodePointArrayView(codePoints)));
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}
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{
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const std::vector<int> codePoints = {
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0x00E0 /* LATIN SMALL LETTER A WITH GRAVE */,
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0x03C2 /* GREEK SMALL LETTER FINAL SIGMA */,
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0x0430 /* CYRILLIC SMALL LETTER A */,
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0x3042 /* HIRAGANA LETTER A */,
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0x1F36A /* COOKIE */,
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0x1F752 /* ALCHEMICAL SYMBOL FOR STARRED TRIDENT */
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};
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EXPECT_EQ(u8"\u00E0\u03C2\u0430\u3042\U0001F36A\U0001F752",
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Utf8Utils::getUtf8String(CodePointArrayView(codePoints)));
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}
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}
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} // namespace
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} // namespace dicttoolkit
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} // namespace latinime
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