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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
107 lines
3.4 KiB
C++
107 lines
3.4 KiB
C++
//===--- UnicodeCharRanges.h - Types and functions for character ranges ---===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_UNICODECHARRANGES_H
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#define LLVM_SUPPORT_UNICODECHARRANGES_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/Mutex.h"
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#include "llvm/Support/MutexGuard.h"
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#include "llvm/Support/raw_ostream.h"
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#include <algorithm>
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#define DEBUG_TYPE "unicode"
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namespace llvm {
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namespace sys {
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/// Represents a closed range of Unicode code points [Lower, Upper].
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struct UnicodeCharRange {
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uint32_t Lower;
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uint32_t Upper;
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};
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inline bool operator<(uint32_t Value, UnicodeCharRange Range) {
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return Value < Range.Lower;
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}
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inline bool operator<(UnicodeCharRange Range, uint32_t Value) {
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return Range.Upper < Value;
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}
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/// Holds a reference to an ordered array of UnicodeCharRange and allows
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/// to quickly check if a code point is contained in the set represented by this
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/// array.
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class UnicodeCharSet {
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public:
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typedef ArrayRef<UnicodeCharRange> CharRanges;
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/// Constructs a UnicodeCharSet instance from an array of
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/// UnicodeCharRanges.
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///
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/// Array pointed by \p Ranges should have the lifetime at least as long as
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/// the UnicodeCharSet instance, and should not change. Array is validated by
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/// the constructor, so it makes sense to create as few UnicodeCharSet
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/// instances per each array of ranges, as possible.
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#ifdef NDEBUG
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// FIXME: This could use constexpr + static_assert. This way we
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// may get rid of NDEBUG in this header. Unfortunately there are some
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// problems to get this working with MSVC 2013. Change this when
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// the support for MSVC 2013 is dropped.
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constexpr UnicodeCharSet(CharRanges Ranges) : Ranges(Ranges) {}
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#else
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UnicodeCharSet(CharRanges Ranges) : Ranges(Ranges) {
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assert(rangesAreValid());
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}
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#endif
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/// Returns true if the character set contains the Unicode code point
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/// \p C.
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bool contains(uint32_t C) const {
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return std::binary_search(Ranges.begin(), Ranges.end(), C);
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}
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private:
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/// Returns true if each of the ranges is a proper closed range
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/// [min, max], and if the ranges themselves are ordered and non-overlapping.
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bool rangesAreValid() const {
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uint32_t Prev = 0;
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for (CharRanges::const_iterator I = Ranges.begin(), E = Ranges.end();
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I != E; ++I) {
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if (I != Ranges.begin() && Prev >= I->Lower) {
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LLVM_DEBUG(dbgs() << "Upper bound 0x");
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LLVM_DEBUG(dbgs().write_hex(Prev));
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LLVM_DEBUG(dbgs() << " should be less than succeeding lower bound 0x");
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LLVM_DEBUG(dbgs().write_hex(I->Lower) << "\n");
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return false;
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}
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if (I->Upper < I->Lower) {
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LLVM_DEBUG(dbgs() << "Upper bound 0x");
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LLVM_DEBUG(dbgs().write_hex(I->Lower));
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LLVM_DEBUG(dbgs() << " should not be less than lower bound 0x");
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LLVM_DEBUG(dbgs().write_hex(I->Upper) << "\n");
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return false;
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}
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Prev = I->Upper;
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}
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return true;
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}
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const CharRanges Ranges;
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};
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} // namespace sys
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} // namespace llvm
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#undef DEBUG_TYPE // "unicode"
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#endif // LLVM_SUPPORT_UNICODECHARRANGES_H
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