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52 lines
1.7 KiB
C++
52 lines
1.7 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) 2022 - 2023 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/WordData.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 "swift/shims/UnicodeData.h"
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#include <stdint.h>
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SWIFT_RUNTIME_STDLIB_INTERNAL
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__swift_uint8_t _swift_stdlib_getWordBreakProperty(__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 index = 1; //0th element is a dummy element
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while (index < WORD_BREAK_DATA_COUNT) {
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auto entry = _swift_stdlib_words[index];
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// Shift the 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 >> 21) - 1;
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//If we want the left child of the current node in our virtual tree,
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//that's at index * 2, if we want the right child it's at (index * 2) + 1
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if (scalar < lower) {
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index = 2 * index;
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} else if (scalar <= upper) {
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return _swift_stdlib_words_data[index];
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} else {
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index = 2 * index + 1;
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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 word
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// array (this occurs when a scalar doesn't map to any word break
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// property). Return the max value here to indicate .any.
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return UINT8_MAX;
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#endif
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}
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