1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef LATINIME_CHAR_UTILS_H 18 #define LATINIME_CHAR_UTILS_H 19 20 namespace latinime { 21 isAsciiUpper(unsigned short c)22inline static int isAsciiUpper(unsigned short c) { 23 return c >= 'A' && c <= 'Z'; 24 } 25 toAsciiLower(unsigned short c)26inline static unsigned short toAsciiLower(unsigned short c) { 27 return c - 'A' + 'a'; 28 } 29 isAscii(unsigned short c)30inline static int isAscii(unsigned short c) { 31 return c <= 127; 32 } 33 34 unsigned short latin_tolower(unsigned short c); 35 36 /** 37 * Table mapping most combined Latin, Greek, and Cyrillic characters 38 * to their base characters. If c is in range, BASE_CHARS[c] == c 39 * if c is not a combined character, or the base character if it 40 * is combined. 41 */ 42 43 static const int BASE_CHARS_SIZE = 0x0500; 44 extern const unsigned short BASE_CHARS[BASE_CHARS_SIZE]; 45 toBaseChar(unsigned short c)46inline static unsigned short toBaseChar(unsigned short c) { 47 if (c < BASE_CHARS_SIZE) { 48 return BASE_CHARS[c]; 49 } 50 return c; 51 } 52 toBaseLowerCase(unsigned short c)53inline static unsigned short toBaseLowerCase(unsigned short c) { 54 c = toBaseChar(c); 55 if (isAsciiUpper(c)) { 56 return toAsciiLower(c); 57 } else if (isAscii(c)) { 58 return c; 59 } 60 return latin_tolower(c); 61 } 62 63 } // namespace latinime 64 65 #endif // LATINIME_CHAR_UTILS_H 66