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annotate include/llvm/Support/UnicodeCharRanges.h @ 0:95c75e76d11b

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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children 54457678186b
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1 //===--- UnicodeCharRanges.h - Types and functions for character ranges ---===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 #ifndef LLVM_SUPPORT_UNICODECHARRANGES_H
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10 #define LLVM_SUPPORT_UNICODECHARRANGES_H
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11
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12 #include "llvm/ADT/ArrayRef.h"
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13 #include "llvm/ADT/SmallPtrSet.h"
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14 #include "llvm/Support/Compiler.h"
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15 #include "llvm/Support/Debug.h"
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16 #include "llvm/Support/Mutex.h"
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17 #include "llvm/Support/MutexGuard.h"
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18 #include "llvm/Support/raw_ostream.h"
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19
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20 #include <algorithm>
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21
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22 namespace llvm {
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23 namespace sys {
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24
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25 /// \brief Represents a closed range of Unicode code points [Lower, Upper].
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26 struct UnicodeCharRange {
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27 uint32_t Lower;
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28 uint32_t Upper;
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29 };
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30
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31 inline bool operator<(uint32_t Value, UnicodeCharRange Range) {
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32 return Value < Range.Lower;
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33 }
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34 inline bool operator<(UnicodeCharRange Range, uint32_t Value) {
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35 return Range.Upper < Value;
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36 }
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37
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38 /// \brief Holds a reference to an ordered array of UnicodeCharRange and allows
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39 /// to quickly check if a code point is contained in the set represented by this
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40 /// array.
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41 class UnicodeCharSet {
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42 public:
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43 typedef llvm::ArrayRef<UnicodeCharRange> CharRanges;
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44
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45 /// \brief Constructs a UnicodeCharSet instance from an array of
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46 /// UnicodeCharRanges.
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47 ///
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48 /// Array pointed by \p Ranges should have the lifetime at least as long as
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49 /// the UnicodeCharSet instance, and should not change. Array is validated by
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50 /// the constructor, so it makes sense to create as few UnicodeCharSet
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51 /// instances per each array of ranges, as possible.
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52 UnicodeCharSet(CharRanges Ranges) : Ranges(Ranges) {
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53 assert(rangesAreValid());
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54 }
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55
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56 /// \brief Returns true if the character set contains the Unicode code point
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57 /// \p C.
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58 bool contains(uint32_t C) const {
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59 return std::binary_search(Ranges.begin(), Ranges.end(), C);
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60 }
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61
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62 private:
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63 /// \brief Returns true if each of the ranges is a proper closed range
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64 /// [min, max], and if the ranges themselves are ordered and non-overlapping.
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65 bool rangesAreValid() const {
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66 uint32_t Prev = 0;
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67 for (CharRanges::const_iterator I = Ranges.begin(), E = Ranges.end();
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68 I != E; ++I) {
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69 if (I != Ranges.begin() && Prev >= I->Lower) {
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70 DEBUG(llvm::dbgs() << "Upper bound 0x");
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71 DEBUG(llvm::dbgs().write_hex(Prev));
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72 DEBUG(llvm::dbgs() << " should be less than succeeding lower bound 0x");
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73 DEBUG(llvm::dbgs().write_hex(I->Lower) << "\n");
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74 return false;
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75 }
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76 if (I->Upper < I->Lower) {
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77 DEBUG(llvm::dbgs() << "Upper bound 0x");
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78 DEBUG(llvm::dbgs().write_hex(I->Lower));
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79 DEBUG(llvm::dbgs() << " should not be less than lower bound 0x");
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80 DEBUG(llvm::dbgs().write_hex(I->Upper) << "\n");
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81 return false;
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82 }
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83 Prev = I->Upper;
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84 }
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85
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86 return true;
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87 }
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88
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89 const CharRanges Ranges;
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90 };
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91
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92 } // namespace sys
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93 } // namespace llvm
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94
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95
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96 #endif // LLVM_SUPPORT_UNICODECHARRANGES_H