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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2021 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#if SWIFT_STDLIB_ENABLE_UNICODE_DATA
#include "Common/GraphemeData.h"
#else
#include "swift/Runtime/Debug.h"
#endif
#include "swift/shims/UnicodeData.h"
#include <limits>
SWIFT_RUNTIME_STDLIB_INTERNAL
__swift_uint8_t _swift_stdlib_getGraphemeBreakProperty(__swift_uint32_t scalar) {
#if !SWIFT_STDLIB_ENABLE_UNICODE_DATA
swift::swift_abortDisabledUnicodeSupport();
#else
auto index = 1; //0th element is a dummy element
while (index < GRAPHEME_BREAK_DATA_COUNT) {
auto entry = _swift_stdlib_graphemeBreakProperties[index];
// Shift the enum and range count out of the value.
auto lower = (entry << 11) >> 11;
// Shift the enum out first, then shift out the scalar value.
auto upper = lower + ((entry << 3) >> 24);
// Shift everything out.
auto enumValue = (__swift_uint8_t)(entry >> 29);
// Special case: extendedPictographic who used an extra bit for the range.
if (enumValue == 5) {
upper = lower + ((entry << 2) >> 23);
}
//If we want the left child of the current node in our virtual tree,
//that's at index * 2, if we want the right child it's at (index * 2) + 1
if (scalar < lower) {
index = 2 * index;
} else if (scalar <= upper) {
return enumValue;
} else {
index = 2 * index + 1;
}
}
// If we made it out here, then our scalar was not found in the grapheme
// array (this occurs when a scalar doesn't map to any grapheme break
// property). Return the max value here to indicate .any.
return 0xFF;
#endif
}
SWIFT_RUNTIME_STDLIB_INTERNAL
__swift_bool _swift_stdlib_isLinkingConsonant(__swift_uint32_t scalar) {
#if !SWIFT_STDLIB_ENABLE_UNICODE_DATA
swift::swift_abortDisabledUnicodeSupport();
#else
auto idx = _swift_stdlib_getScalarBitArrayIdx(scalar,
_swift_stdlib_linkingConsonant,
_swift_stdlib_linkingConsonant_ranks);
if (idx == std::numeric_limits<__swift_intptr_t>::max()) {
return false;
}
return true;
#endif
}
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