/* * Copyright (C) 2008 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 <utils/AndroidUnicode.h> #include "CharacterData.h" #define LOG_TAG "Unicode" #include <utils/Log.h> // ICU headers for using macros #include <unicode/utf16.h> #define MIN_RADIX 2 #define MAX_RADIX 36 #define TYPE_SHIFT 0 #define TYPE_MASK ((1<<5)-1) #define DIRECTION_SHIFT (TYPE_SHIFT+5) #define DIRECTION_MASK ((1<<5)-1) #define MIRRORED_SHIFT (DIRECTION_SHIFT+5) #define MIRRORED_MASK ((1<<1)-1) #define TOUPPER_SHIFT (MIRRORED_SHIFT+1) #define TOUPPER_MASK ((1<<6)-1) #define TOLOWER_SHIFT (TOUPPER_SHIFT+6) #define TOLOWER_MASK ((1<<6)-1) #define TOTITLE_SHIFT (TOLOWER_SHIFT+6) #define TOTITLE_MASK ((1<<2)-1) #define MIRROR_SHIFT (TOTITLE_SHIFT+2) #define MIRROR_MASK ((1<<5)-1) #define NUMERIC_SHIFT (TOTITLE_SHIFT+2) #define NUMERIC_MASK ((1<<7)-1) #define DECOMPOSITION_SHIFT (11) #define DECOMPOSITION_MASK ((1<<5)-1) /* * Returns the value stored in the CharacterData tables that contains * an index into the packed data table and the decomposition type. */ static uint16_t findCharacterValue(UChar32 c) { LOG_ASSERT(c >= 0 && c <= 0x10FFFF, "findCharacterValue received an invalid codepoint"); if (c < 256) return CharacterData::LATIN1_DATA[c]; // Rotate the bits because the tables are separated into even and odd codepoints c = (c >> 1) | ((c & 1) << 20); CharacterData::Range search = CharacterData::FULL_DATA[c >> 16]; const uint32_t* array = search.array; // This trick is so that that compare in the while loop does not // need to shift the array entry down by 16 c <<= 16; c |= 0xFFFF; int high = (int)search.length - 1; int low = 0; if (high < 0) return 0; while (low < high - 1) { int probe = (high + low) >> 1; // The entries contain the codepoint in the high 16 bits and the index // into PACKED_DATA in the low 16. if (array[probe] > (unsigned)c) high = probe; else low = probe; } LOG_ASSERT((array[low] <= (unsigned)c), "A suitable range was not found"); return array[low] & 0xFFFF; } uint32_t android::Unicode::getPackedData(UChar32 c) { // findCharacterValue returns a 16-bit value with the top 5 bits containing a decomposition type // and the remaining bits containing an index. return CharacterData::PACKED_DATA[findCharacterValue(c) & 0x7FF]; } android::Unicode::CharType android::Unicode::getType(UChar32 c) { if (c < 0 || c >= 0x10FFFF) return CHARTYPE_UNASSIGNED; return (CharType)((getPackedData(c) >> TYPE_SHIFT) & TYPE_MASK); } android::Unicode::DecompositionType android::Unicode::getDecompositionType(UChar32 c) { // findCharacterValue returns a 16-bit value with the top 5 bits containing a decomposition type // and the remaining bits containing an index. return (DecompositionType)((findCharacterValue(c) >> DECOMPOSITION_SHIFT) & DECOMPOSITION_MASK); } int android::Unicode::getDigitValue(UChar32 c, int radix) { if (radix < MIN_RADIX || radix > MAX_RADIX) return -1; int tempValue = radix; if (c >= '0' && c <= '9') tempValue = c - '0'; else if (c >= 'a' && c <= 'z') tempValue = c - 'a' + 10; else if (c >= 'A' && c <= 'Z') tempValue = c - 'A' + 10; return tempValue < radix ? tempValue : -1; } int android::Unicode::getNumericValue(UChar32 c) { if (isMirrored(c)) return -1; return (int) CharacterData::NUMERICS[((getPackedData(c) >> NUMERIC_SHIFT) & NUMERIC_MASK)]; } UChar32 android::Unicode::toLower(UChar32 c) { return c + CharacterData::LCDIFF[(getPackedData(c) >> TOLOWER_SHIFT) & TOLOWER_MASK]; } UChar32 android::Unicode::toUpper(UChar32 c) { return c + CharacterData::UCDIFF[(getPackedData(c) >> TOUPPER_SHIFT) & TOUPPER_MASK]; } android::Unicode::Direction android::Unicode::getDirectionality(UChar32 c) { uint32_t data = getPackedData(c); if (0 == data) return DIRECTIONALITY_UNDEFINED; Direction d = (Direction) ((data >> DIRECTION_SHIFT) & DIRECTION_MASK); if (DIRECTION_MASK == d) return DIRECTIONALITY_UNDEFINED; return d; } bool android::Unicode::isMirrored(UChar32 c) { return ((getPackedData(c) >> MIRRORED_SHIFT) & MIRRORED_MASK) != 0; } UChar32 android::Unicode::toMirror(UChar32 c) { if (!isMirrored(c)) return c; return c + CharacterData::MIRROR_DIFF[(getPackedData(c) >> MIRROR_SHIFT) & MIRROR_MASK]; } UChar32 android::Unicode::toTitle(UChar32 c) { int32_t diff = CharacterData::TCDIFF[(getPackedData(c) >> TOTITLE_SHIFT) & TOTITLE_MASK]; if (TOTITLE_MASK == diff) return toUpper(c); return c + diff; }