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annotate include/llvm/Support/LineIterator.h @ 121:803732b1fca8

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LLVM 5.0
author kono
date Fri, 27 Oct 2017 17:07:41 +0900
parents 60c9769439b8
children c2174574ed3a
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1 //===- LineIterator.h - Iterator to read a text buffer's lines --*- C++ -*-===//
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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
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10 #ifndef LLVM_SUPPORT_LINEITERATOR_H
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11 #define LLVM_SUPPORT_LINEITERATOR_H
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12
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13 #include "llvm/ADT/StringRef.h"
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14 #include "llvm/Support/DataTypes.h"
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15 #include <iterator>
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16
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17 namespace llvm {
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18
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19 class MemoryBuffer;
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20
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21 /// \brief A forward iterator which reads text lines from a buffer.
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22 ///
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23 /// This class provides a forward iterator interface for reading one line at
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24 /// a time from a buffer. When default constructed the iterator will be the
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25 /// "end" iterator.
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26 ///
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27 /// The iterator is aware of what line number it is currently processing. It
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28 /// strips blank lines by default, and comment lines given a comment-starting
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29 /// character.
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30 ///
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31 /// Note that this iterator requires the buffer to be nul terminated.
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32 class line_iterator
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33 : public std::iterator<std::forward_iterator_tag, StringRef> {
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34 const MemoryBuffer *Buffer;
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35 char CommentMarker;
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36 bool SkipBlanks;
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37
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38 unsigned LineNumber;
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39 StringRef CurrentLine;
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40
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41 public:
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42 /// \brief Default construct an "end" iterator.
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43 line_iterator() : Buffer(nullptr) {}
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44
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45 /// \brief Construct a new iterator around some memory buffer.
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46 explicit line_iterator(const MemoryBuffer &Buffer, bool SkipBlanks = true,
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47 char CommentMarker = '\0');
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49 /// \brief Return true if we've reached EOF or are an "end" iterator.
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50 bool is_at_eof() const { return !Buffer; }
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52 /// \brief Return true if we're an "end" iterator or have reached EOF.
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53 bool is_at_end() const { return is_at_eof(); }
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55 /// \brief Return the current line number. May return any number at EOF.
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56 int64_t line_number() const { return LineNumber; }
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57
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58 /// \brief Advance to the next (non-empty, non-comment) line.
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59 line_iterator &operator++() {
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60 advance();
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61 return *this;
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62 }
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63 line_iterator operator++(int) {
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64 line_iterator tmp(*this);
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65 advance();
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66 return tmp;
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67 }
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68
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69 /// \brief Get the current line as a \c StringRef.
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70 StringRef operator*() const { return CurrentLine; }
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71 const StringRef *operator->() const { return &CurrentLine; }
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72
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73 friend bool operator==(const line_iterator &LHS, const line_iterator &RHS) {
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74 return LHS.Buffer == RHS.Buffer &&
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75 LHS.CurrentLine.begin() == RHS.CurrentLine.begin();
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76 }
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78 friend bool operator!=(const line_iterator &LHS, const line_iterator &RHS) {
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79 return !(LHS == RHS);
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80 }
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81
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82 private:
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83 /// \brief Advance the iterator to the next line.
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84 void advance();
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85 };
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86 }
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87
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88 #endif