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4814e00fda
algorithm The implementation uses a specialized trie that has not been tuned to the table data. I tried guessing parameter values that should work well, but did not do any performance measurements. There is no efficient way to initialize arrays with static data in Swift. The required tables are being generated as C++ code in the runtime library. rdar://16013860 Swift SVN r19340
83 lines
2.5 KiB
C++
83 lines
2.5 KiB
C++
//===--- Unicode.h - Unicode utilities --------------------------*- 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) 2014 - 2015 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 http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_BASIC_UNICODE_H
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#define SWIFT_BASIC_UNICODE_H
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#include "swift/Basic/LLVM.h"
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#include "llvm/ADT/StringRef.h"
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namespace swift {
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namespace unicode {
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StringRef extractFirstExtendedGraphemeCluster(StringRef S);
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static inline bool isSingleExtendedGraphemeCluster(StringRef S) {
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StringRef First = extractFirstExtendedGraphemeCluster(S);
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if (First.empty())
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return false;
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return First == S;
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}
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enum class GraphemeClusterBreakProperty : uint8_t {
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Other,
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CR,
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LF,
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Control,
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Extend,
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Regional_Indicator,
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Prepend,
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SpacingMark,
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L,
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V,
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T,
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LV,
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LVT,
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};
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/// Extended grapheme cluster boundary rules, represented as a matrix. Indexed
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/// by first code point, then by second code point in least-significant-bit
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/// order. A set bit means that a boundary is prohibited between two code
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/// points.
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extern const uint16_t ExtendedGraphemeClusterNoBoundaryRulesMatrix[];
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/// Returns the value of the Grapheme_Cluster_Break property for a given code
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/// point.
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GraphemeClusterBreakProperty getGraphemeClusterBreakProperty(uint32_t C);
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/// Returns true if there is always an extended grapheme cluster boundary
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/// after a code point with a given property value. Use only for optimization,
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/// to skip calculating Grapheme_Cluster_Break property for the second code
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/// point.
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static inline bool
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isExtendedGraphemeClusterBoundaryAfter(GraphemeClusterBreakProperty GCB1) {
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auto RuleRow =
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ExtendedGraphemeClusterNoBoundaryRulesMatrix[static_cast<unsigned>(GCB1)];
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return RuleRow == 0;
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}
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/// Determine if there is an extended grapheme cluster boundary between code
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/// points with given Grapheme_Cluster_Break property values.
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static inline bool
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isExtendedGraphemeClusterBoundary(GraphemeClusterBreakProperty GCB1,
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GraphemeClusterBreakProperty GCB2) {
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auto RuleRow =
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ExtendedGraphemeClusterNoBoundaryRulesMatrix[static_cast<unsigned>(GCB1)];
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return !(RuleRow & (1 << static_cast<unsigned>(GCB2)));
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}
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} // namespace unicode
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} // namespace swift
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#endif
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