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/*
* 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;
}
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