77 lines
2.2 KiB
C++
77 lines
2.2 KiB
C++
/*
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* Copyright (C) 2010 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_CHAR_UTILS_H
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#define LATINIME_CHAR_UTILS_H
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#include <cctype>
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#include <stdint.h>
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namespace latinime {
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inline static bool isAsciiUpper(unsigned short c) {
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// Note: isupper(...) reports false positives for some Cyrillic characters, causing them to
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// be incorrectly lower-cased using toAsciiLower(...) rather than latin_tolower(...).
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return (c >= 'A' && c <= 'Z');
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}
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inline static unsigned short toAsciiLower(unsigned short c) {
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return c - 'A' + 'a';
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}
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inline static bool isAscii(unsigned short c) {
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return isascii(static_cast<int>(c)) != 0;
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}
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unsigned short latin_tolower(const unsigned short c);
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/**
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* Table mapping most combined Latin, Greek, and Cyrillic characters
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* to their base characters. If c is in range, BASE_CHARS[c] == c
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* if c is not a combined character, or the base character if it
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* is combined.
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*/
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static const int BASE_CHARS_SIZE = 0x0500;
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extern const uint16_t BASE_CHARS[BASE_CHARS_SIZE];
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inline static unsigned short toBaseChar(unsigned short c) {
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if (c < BASE_CHARS_SIZE) {
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return BASE_CHARS[c];
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}
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return c;
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}
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inline static unsigned short toLowerCase(const unsigned short c) {
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if (isAsciiUpper(c)) {
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return toAsciiLower(c);
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} else if (isAscii(c)) {
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return c;
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}
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return latin_tolower(c);
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}
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inline static unsigned short toBaseLowerCase(const unsigned short c) {
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return toLowerCase(toBaseChar(c));
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}
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inline static bool isSkippableChar(const uint16_t character) {
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// TODO: Do not hardcode here
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return character == '\'' || character == '-';
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}
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} // namespace latinime
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#endif // LATINIME_CHAR_UTILS_H
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