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//===--- Unicode.h - Unicode utilities --------------------------*- C++ -*-===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 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
//
//===----------------------------------------------------------------------===//
#ifndef SWIFT_BASIC_UNICODE_H
#define SWIFT_BASIC_UNICODE_H
#include "swift/Basic/LLVM.h"
#include "llvm/ADT/StringRef.h"
namespace swift {
namespace unicode {
StringRef extractFirstExtendedGraphemeCluster(StringRef S);
static inline bool isSingleExtendedGraphemeCluster(StringRef S) {
StringRef First = extractFirstExtendedGraphemeCluster(S);
if (First.empty())
return false;
return First == S;
}
enum class GraphemeClusterBreakProperty : uint8_t {
Other,
CR,
LF,
Control,
Extend,
Regional_Indicator,
Prepend,
SpacingMark,
L,
V,
T,
LV,
LVT,
};
/// Extended grapheme cluster boundary rules, represented as a matrix. Indexed
/// by first code point, then by second code point in least-significant-bit
/// order. A set bit means that a boundary is prohibited between two code
/// points.
extern const uint16_t ExtendedGraphemeClusterNoBoundaryRulesMatrix[];
/// Returns the value of the Grapheme_Cluster_Break property for a given code
/// point.
GraphemeClusterBreakProperty getGraphemeClusterBreakProperty(uint32_t C);
/// Determine if there is an extended grapheme cluster boundary between code
/// points with given Grapheme_Cluster_Break property values.
static inline bool
isExtendedGraphemeClusterBoundary(GraphemeClusterBreakProperty GCB1,
GraphemeClusterBreakProperty GCB2) {
auto RuleRow =
ExtendedGraphemeClusterNoBoundaryRulesMatrix[static_cast<unsigned>(GCB1)];
return !(RuleRow & (1 << static_cast<unsigned>(GCB2)));
}
bool isSingleUnicodeScalar(StringRef S);
unsigned extractFirstUnicodeScalar(StringRef S);
} // end namespace unicode
} // end namespace swift
#endif // SWIFT_BASIC_UNICODE_H