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