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99 lines
2.8 KiB
C
99 lines
2.8 KiB
C
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//===--- UnicodeCharRanges.h - Types and functions for character ranges ---===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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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namespace {
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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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typedef llvm::ArrayRef<UnicodeCharRange> UnicodeCharSet;
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/// Returns true if each of the ranges in \p CharSet 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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static inline bool isValidCharSet(UnicodeCharSet CharSet) {
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#ifndef NDEBUG
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static llvm::SmallPtrSet<const UnicodeCharRange *, 16> Validated;
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static llvm::sys::Mutex ValidationMutex;
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// Check the validation cache.
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{
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llvm::MutexGuard Guard(ValidationMutex);
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if (Validated.count(CharSet.data()))
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return true;
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}
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// Walk through the ranges.
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uint32_t Prev = 0;
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for (UnicodeCharSet::iterator I = CharSet.begin(), E = CharSet.end();
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I != E; ++I) {
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if (I != CharSet.begin() && Prev >= I->Lower) {
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DEBUG(llvm::dbgs() << "Upper bound 0x");
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DEBUG(llvm::dbgs().write_hex(Prev));
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DEBUG(llvm::dbgs() << " should be less than succeeding lower bound 0x");
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DEBUG(llvm::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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DEBUG(llvm::dbgs() << "Upper bound 0x");
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DEBUG(llvm::dbgs().write_hex(I->Lower));
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DEBUG(llvm::dbgs() << " should not be less than lower bound 0x");
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DEBUG(llvm::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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// Update the validation cache.
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{
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llvm::MutexGuard Guard(ValidationMutex);
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Validated.insert(CharSet.data());
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}
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#endif
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return true;
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}
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} // namespace
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/// Returns true if the Unicode code point \p C is within the set of
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/// characters specified by \p CharSet.
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LLVM_READONLY static inline bool isCharInSet(uint32_t C,
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UnicodeCharSet CharSet) {
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assert(isValidCharSet(CharSet));
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size_t LowPoint = 0;
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size_t HighPoint = CharSet.size();
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// Binary search the set of char ranges.
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while (HighPoint != LowPoint) {
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size_t MidPoint = (HighPoint + LowPoint) / 2;
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if (C < CharSet[MidPoint].Lower)
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HighPoint = MidPoint;
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else if (C > CharSet[MidPoint].Upper)
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LowPoint = MidPoint + 1;
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else
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return true;
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}
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return false;
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}
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#endif // LLVM_SUPPORT_UNICODECHARRANGES_H
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