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// © 2021 and later: Unicode, Inc. and others.
// License & terms of use: https://www.unicode.org/copyright.html
// emojiprops.cpp
// created: 2021sep04 Markus W. Scherer
#include "unicode/utypes.h"
#include "unicode/uchar.h"
#include "unicode/ucharstrie.h"
#include "unicode/ucptrie.h"
#include "unicode/udata.h"
#include "unicode/ustringtrie.h"
#include "unicode/utf16.h"
#include "emojiprops.h"
#include "ucln.h"
#include "ucln_cmn.h"
#include "umutex.h"
#include "uset_imp.h"
U_NAMESPACE_BEGIN
namespace {
EmojiProps *singleton = nullptr;
icu::UInitOnce emojiInitOnce {};
UBool U_CALLCONV emojiprops_cleanup() {
delete singleton;
singleton = nullptr;
emojiInitOnce.reset();
return true;
}
void U_CALLCONV initSingleton(UErrorCode &errorCode) {
if (U_FAILURE(errorCode)) { return; }
singleton = new EmojiProps(errorCode);
if (singleton == nullptr) {
errorCode = U_MEMORY_ALLOCATION_ERROR;
} else if (U_FAILURE(errorCode)) {
delete singleton;
singleton = nullptr;
}
ucln_common_registerCleanup(UCLN_COMMON_EMOJIPROPS, emojiprops_cleanup);
}
// TODO: turn this into a shared helper function
// Requires the major version to match, and then requires at least the minor version.
UBool udata_isAcceptableMajorMinor(
const UDataInfo &info, const char16_t *dataFormat, uint8_t major, uint8_t minor) {
return
info.size >= 20 &&
info.isBigEndian == U_IS_BIG_ENDIAN &&
info.charsetFamily == U_CHARSET_FAMILY &&
info.dataFormat[0] == dataFormat[0] &&
info.dataFormat[1] == dataFormat[1] &&
info.dataFormat[2] == dataFormat[2] &&
info.dataFormat[3] == dataFormat[3] &&
info.formatVersion[0] == major &&
info.formatVersion[1] >= minor;
}
} // namespace
EmojiProps::~EmojiProps() {
udata_close(memory);
ucptrie_close(cpTrie);
}
const EmojiProps *
EmojiProps::getSingleton(UErrorCode &errorCode) {
if (U_FAILURE(errorCode)) { return nullptr; }
umtx_initOnce(emojiInitOnce, &initSingleton, errorCode);
return singleton;
}
UBool U_CALLCONV
EmojiProps::isAcceptable(void * /*context*/, const char * /*type*/, const char * /*name*/,
const UDataInfo *pInfo) {
return udata_isAcceptableMajorMinor(*pInfo, u"Emoj", 1, 0);
}
void
EmojiProps::load(UErrorCode &errorCode) {
memory = udata_openChoice(nullptr, "icu", "uemoji", isAcceptable, this, &errorCode);
if (U_FAILURE(errorCode)) { return; }
const uint8_t* inBytes = static_cast<const uint8_t*>(udata_getMemory(memory));
const int32_t* inIndexes = reinterpret_cast<const int32_t*>(inBytes);
int32_t indexesLength = inIndexes[IX_CPTRIE_OFFSET] / 4;
if (indexesLength <= IX_RGI_EMOJI_ZWJ_SEQUENCE_TRIE_OFFSET) {
errorCode = U_INVALID_FORMAT_ERROR; // Not enough indexes.
return;
}
int32_t i = IX_CPTRIE_OFFSET;
int32_t offset = inIndexes[i++];
int32_t nextOffset = inIndexes[i];
cpTrie = ucptrie_openFromBinary(UCPTRIE_TYPE_FAST, UCPTRIE_VALUE_BITS_8,
inBytes + offset, nextOffset - offset, nullptr, &errorCode);
if (U_FAILURE(errorCode)) {
return;
}
for (i = IX_BASIC_EMOJI_TRIE_OFFSET; i <= IX_RGI_EMOJI_ZWJ_SEQUENCE_TRIE_OFFSET; ++i) {
offset = inIndexes[i];
nextOffset = inIndexes[i + 1];
// Set/leave nullptr if there is no UCharsTrie.
const char16_t* p = nextOffset > offset ? reinterpret_cast<const char16_t*>(inBytes + offset) : nullptr;
stringTries[getStringTrieIndex(i)] = p;
}
}
void
EmojiProps::addPropertyStarts(const USetAdder *sa, UErrorCode & /*errorCode*/) const {
// Add the start code point of each same-value range of the trie.
UChar32 start = 0, end;
uint32_t value;
while ((end = ucptrie_getRange(cpTrie, start, UCPMAP_RANGE_NORMAL, 0,
nullptr, nullptr, &value)) >= 0) {
sa->add(sa->set, start);
start = end + 1;
}
}
UBool
EmojiProps::hasBinaryProperty(UChar32 c, UProperty which) {
UErrorCode errorCode = U_ZERO_ERROR;
const EmojiProps *ep = getSingleton(errorCode);
return U_SUCCESS(errorCode) && ep->hasBinaryPropertyImpl(c, which);
}
UBool
EmojiProps::hasBinaryPropertyImpl(UChar32 c, UProperty which) const {
if (which < UCHAR_EMOJI || UCHAR_RGI_EMOJI < which) {
return false;
}
// Note: UCHAR_REGIONAL_INDICATOR is a single, hardcoded range implemented elsewhere.
static constexpr int8_t bitFlags[] = {
BIT_EMOJI, // UCHAR_EMOJI=57
BIT_EMOJI_PRESENTATION, // UCHAR_EMOJI_PRESENTATION=58
BIT_EMOJI_MODIFIER, // UCHAR_EMOJI_MODIFIER=59
BIT_EMOJI_MODIFIER_BASE, // UCHAR_EMOJI_MODIFIER_BASE=60
BIT_EMOJI_COMPONENT, // UCHAR_EMOJI_COMPONENT=61
-1, // UCHAR_REGIONAL_INDICATOR=62
-1, // UCHAR_PREPENDED_CONCATENATION_MARK=63
BIT_EXTENDED_PICTOGRAPHIC, // UCHAR_EXTENDED_PICTOGRAPHIC=64
BIT_BASIC_EMOJI, // UCHAR_BASIC_EMOJI=65
-1, // UCHAR_EMOJI_KEYCAP_SEQUENCE=66
-1, // UCHAR_RGI_EMOJI_MODIFIER_SEQUENCE=67
-1, // UCHAR_RGI_EMOJI_FLAG_SEQUENCE=68
-1, // UCHAR_RGI_EMOJI_TAG_SEQUENCE=69
-1, // UCHAR_RGI_EMOJI_ZWJ_SEQUENCE=70
BIT_BASIC_EMOJI, // UCHAR_RGI_EMOJI=71
};
int32_t bit = bitFlags[which - UCHAR_EMOJI];
if (bit < 0) {
return false; // not a property that we support in this function
}
uint8_t bits = UCPTRIE_FAST_GET(cpTrie, UCPTRIE_8, c);
return (bits >> bit) & 1;
}
UBool
EmojiProps::hasBinaryProperty(const char16_t *s, int32_t length, UProperty which) {
UErrorCode errorCode = U_ZERO_ERROR;
const EmojiProps *ep = getSingleton(errorCode);
return U_SUCCESS(errorCode) && ep->hasBinaryPropertyImpl(s, length, which);
}
UBool
EmojiProps::hasBinaryPropertyImpl(const char16_t *s, int32_t length, UProperty which) const {
if (s == nullptr && length != 0) { return false; }
if (length <= 0 && (length == 0 || *s == 0)) { return false; } // empty string
// The caller should have delegated single code points to hasBinaryProperty(c, which).
if (which < UCHAR_BASIC_EMOJI || UCHAR_RGI_EMOJI < which) {
return false;
}
UProperty firstProp = which, lastProp = which;
if (which == UCHAR_RGI_EMOJI) {
// RGI_Emoji is the union of the other emoji properties of strings.
firstProp = UCHAR_BASIC_EMOJI;
lastProp = UCHAR_RGI_EMOJI_ZWJ_SEQUENCE;
}
for (int32_t prop = firstProp; prop <= lastProp; ++prop) {
const char16_t *trieUChars = stringTries[prop - UCHAR_BASIC_EMOJI];
if (trieUChars != nullptr) {
UCharsTrie trie(trieUChars);
UStringTrieResult result = trie.next(s, length);
if (USTRINGTRIE_HAS_VALUE(result)) {
return true;
}
}
}
return false;
}
void
EmojiProps::addStrings(const USetAdder *sa, UProperty which, UErrorCode &errorCode) const {
if (U_FAILURE(errorCode)) { return; }
if (which < UCHAR_BASIC_EMOJI || UCHAR_RGI_EMOJI < which) {
return;
}
UProperty firstProp = which, lastProp = which;
if (which == UCHAR_RGI_EMOJI) {
// RGI_Emoji is the union of the other emoji properties of strings.
firstProp = UCHAR_BASIC_EMOJI;
lastProp = UCHAR_RGI_EMOJI_ZWJ_SEQUENCE;
}
for (int32_t prop = firstProp; prop <= lastProp; ++prop) {
const char16_t *trieUChars = stringTries[prop - UCHAR_BASIC_EMOJI];
if (trieUChars != nullptr) {
UCharsTrie::Iterator iter(trieUChars, 0, errorCode);
while (iter.next(errorCode)) {
const UnicodeString &s = iter.getString();
sa->addString(sa->set, s.getBuffer(), s.length());
}
}
}
}
U_NAMESPACE_END
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