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/*
* Copyright (C) 2010 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_CHAR_UTILS_H
#define LATINIME_CHAR_UTILS_H
#include <cctype>
#include <cstring>
#include <vector>
#include "defines.h"
namespace latinime {
class CharUtils {
public:
static const std::vector<int> EMPTY_STRING;
static AK_FORCE_INLINE bool isAsciiUpper(int c) {
// Note: isupper(...) reports false positives for some Cyrillic characters, causing them to
// be incorrectly lower-cased using toAsciiLower(...) rather than latin_tolower(...).
return (c >= 'A' && c <= 'Z');
}
static AK_FORCE_INLINE int toLowerCase(const int c) {
if (isAsciiUpper(c)) {
return toAsciiLower(c);
}
if (isAscii(c)) {
return c;
}
return latin_tolower(c);
}
static AK_FORCE_INLINE int toBaseLowerCase(const int c) {
return toLowerCase(toBaseCodePoint(c));
}
static AK_FORCE_INLINE bool isIntentionalOmissionCodePoint(const int codePoint) {
// TODO: Do not hardcode here
return codePoint == KEYCODE_SINGLE_QUOTE || codePoint == KEYCODE_HYPHEN_MINUS;
}
static AK_FORCE_INLINE int getCodePointCount(const int arraySize, const int *const codePoints) {
int size = 0;
for (; size < arraySize; ++size) {
if (codePoints[size] == '\0') {
break;
}
}
return size;
}
static AK_FORCE_INLINE int toBaseCodePoint(int c) {
if (c < BASE_CHARS_SIZE) {
return static_cast<int>(BASE_CHARS[c]);
}
return c;
}
static AK_FORCE_INLINE int getSpaceCount(const int *const codePointBuffer, const int length) {
int spaceCount = 0;
for (int i = 0; i < length; ++i) {
if (codePointBuffer[i] == KEYCODE_SPACE) {
++spaceCount;
}
}
return spaceCount;
}
static AK_FORCE_INLINE int isInUnicodeSpace(const int codePoint) {
return codePoint >= MIN_UNICODE_CODE_POINT && codePoint <= MAX_UNICODE_CODE_POINT;
}
// Returns updated code point count. Returns 0 when the code points cannot be marked as a
// Beginning-of-Sentence.
static AK_FORCE_INLINE int attachBeginningOfSentenceMarker(int *const codePoints,
const int codePointCount, const int maxCodePoint) {
if (codePointCount > 0 && codePoints[0] == CODE_POINT_BEGINNING_OF_SENTENCE) {
// Marker has already been attached.
return codePointCount;
}
if (codePointCount >= maxCodePoint) {
// the code points cannot be marked as a Beginning-of-Sentence.
return 0;
}
memmove(codePoints + 1, codePoints, sizeof(int) * codePointCount);
codePoints[0] = CODE_POINT_BEGINNING_OF_SENTENCE;
return codePointCount + 1;
}
private:
DISALLOW_IMPLICIT_CONSTRUCTORS(CharUtils);
static const int MIN_UNICODE_CODE_POINT;
static const int MAX_UNICODE_CODE_POINT;
/**
* Table mapping most combined Latin, Greek, and Cyrillic characters
* to their base characters. If c is in range, BASE_CHARS[c] == c
* if c is not a combined character, or the base character if it
* is combined.
*/
static const int BASE_CHARS_SIZE = 0x0500;
static const unsigned short BASE_CHARS[BASE_CHARS_SIZE];
static AK_FORCE_INLINE bool isAscii(int c) {
return isascii(c) != 0;
}
static AK_FORCE_INLINE int toAsciiLower(int c) {
return c - 'A' + 'a';
}
static int latin_tolower(const int c);
};
} // namespace latinime
#endif // LATINIME_CHAR_UTILS_H
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