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annotate OrthancFramework/Sources/HttpServer/StringMatcher.cpp @ 4201:2d5209153b32

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 17 Sep 2020 08:18:28 +0200
parents bf7b9edf6b81
children b30a8de92ad9
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2020 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Lesser General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Lesser General Public
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18 * License along with this program. If not, see
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19 * <http://www.gnu.org/licenses/>.
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20 **/
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21
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22
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23 #include "../PrecompiledHeaders.h"
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24 #include "StringMatcher.h"
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25
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26 #include "../OrthancException.h"
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27
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28 #include <boost/algorithm/searching/boyer_moore.hpp>
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29 //#include <boost/algorithm/searching/boyer_moore_horspool.hpp>
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30 //#include <boost/algorithm/searching/knuth_morris_pratt.hpp>
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31
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32 namespace Orthanc
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33 {
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34 class StringMatcher::Search
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35 {
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36 private:
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37 typedef boost::algorithm::boyer_moore<Iterator> Algorithm;
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38 //typedef boost::algorithm::boyer_moore_horspool<std::string::const_iterator> Algorithm;
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39
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40 Algorithm algorithm_;
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41
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42 public:
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43 // WARNING - The lifetime of "pattern_" must be larger than
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44 // "search_", as the latter internally keeps a pointer to "pattern" (*)
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45 explicit Search(const std::string& pattern) :
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46 algorithm_(pattern.begin(), pattern.end())
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47 {
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48 }
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49
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50 Iterator Apply(Iterator start,
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51 Iterator end) const
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52 {
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53 #if BOOST_VERSION >= 106200
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54 return algorithm_(start, end).first;
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55 #else
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56 return algorithm_(start, end);
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57 #endif
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58 }
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59 };
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60
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61
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62 StringMatcher::StringMatcher(const std::string& pattern) :
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63 pattern_(pattern),
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64 valid_(false)
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65 {
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66 // WARNING - Don't use "pattern" (local variable, will be
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67 // destroyed once exiting the constructor) but "pattern_"
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68 // (variable member, will last as long as the algorithm),
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69 // otherwise lifetime is bad! (*)
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70 search_.reset(new Search(pattern_));
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71 }
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72
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73
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74 bool StringMatcher::Apply(Iterator start,
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75 Iterator end)
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76 {
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77 assert(search_.get() != NULL);
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78 matchBegin_ = search_->Apply(start, end);
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79
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80 if (matchBegin_ == end)
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81 {
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82 valid_ = false;
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83 }
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84 else
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85 {
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86 matchEnd_ = matchBegin_ + pattern_.size();
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87 assert(matchEnd_ <= end);
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88 valid_ = true;
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89 }
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90
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91 return valid_;
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92 }
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93
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94
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95 StringMatcher::Iterator StringMatcher::GetMatchBegin() const
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96 {
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97 if (valid_)
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98 {
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99 return matchBegin_;
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100 }
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101 else
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102 {
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103 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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104 }
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105 }
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106
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107
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108 StringMatcher::Iterator StringMatcher::GetMatchEnd() const
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109 {
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110 if (valid_)
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111 {
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112 return matchEnd_;
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113 }
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114 else
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115 {
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116 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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117 }
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118 }
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119
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120
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121 const char* StringMatcher::GetPointerBegin() const
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122 {
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123 return &GetMatchBegin()[0];
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124 }
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125
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126
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127 const char* StringMatcher::GetPointerEnd() const
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128 {
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129 return GetPointerBegin() + pattern_.size();
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130 }
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131 }