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annotate OrthancFramework/Sources/HttpServer/StringMatcher.cpp @ 5342:65d55cc86a41

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author Alain Mazy <am@osimis.io>
date Wed, 28 Jun 2023 11:54:41 +0200
parents 0ea402b4d901
children 48b8dae6dc77
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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) 2017-2023 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2023 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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22
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23
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24 #include "../PrecompiledHeaders.h"
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25 #include "StringMatcher.h"
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26
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27 #include "../OrthancException.h"
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28
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29 #include <boost/algorithm/searching/boyer_moore.hpp>
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30 //#include <boost/algorithm/searching/boyer_moore_horspool.hpp>
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31 //#include <boost/algorithm/searching/knuth_morris_pratt.hpp>
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32
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33 namespace Orthanc
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34 {
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35 class StringMatcher::Search : public boost::noncopyable
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36 {
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37 private:
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38 typedef boost::algorithm::boyer_moore<Iterator> Algorithm;
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39 //typedef boost::algorithm::boyer_moore_horspool<std::string::const_iterator> Algorithm;
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40
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41 Algorithm algorithm_;
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42
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43 public:
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44 // WARNING - The lifetime of "pattern_" must be larger than
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45 // "search_", as the latter internally keeps a pointer to "pattern" (*)
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46 explicit Search(const std::string& pattern) :
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47 algorithm_(pattern.begin(), pattern.end())
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48 {
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49 }
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50
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51 Iterator Apply(Iterator start,
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52 Iterator end) const
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53 {
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54 #if BOOST_VERSION >= 106200
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55 return algorithm_(start, end).first;
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56 #else
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57 return algorithm_(start, end);
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58 #endif
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59 }
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60 };
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61
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62
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63 StringMatcher::StringMatcher(const std::string& pattern) :
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64 pattern_(pattern),
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65 valid_(false)
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66 {
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67 // WARNING - Don't use "pattern" (local variable, will be
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68 // destroyed once exiting the constructor) but "pattern_"
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69 // (variable member, will last as long as the algorithm),
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70 // otherwise lifetime is bad! (*)
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71 search_.reset(new Search(pattern_));
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72 }
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73
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74 const std::string& StringMatcher::GetPattern() const
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75 {
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76 return pattern_;
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77 }
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78
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79 bool StringMatcher::IsValid() const
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80 {
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81 return valid_;
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82 }
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83
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84
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85 bool StringMatcher::Apply(Iterator start,
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86 Iterator end)
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87 {
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88 assert(search_.get() != NULL);
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89 matchBegin_ = search_->Apply(start, end);
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90
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91 if (matchBegin_ == end)
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92 {
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93 valid_ = false;
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94 }
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95 else
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96 {
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97 matchEnd_ = matchBegin_ + pattern_.size();
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98 assert(matchEnd_ <= end);
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99 valid_ = true;
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100 }
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101
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102 return valid_;
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103 }
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104
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105 bool StringMatcher::Apply(const std::string& corpus)
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106 {
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107 return Apply(corpus.begin(), corpus.end());
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108 }
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109
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110
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111 StringMatcher::Iterator StringMatcher::GetMatchBegin() const
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112 {
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113 if (valid_)
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114 {
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115 return matchBegin_;
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116 }
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117 else
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118 {
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119 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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120 }
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121 }
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122
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123
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124 StringMatcher::Iterator StringMatcher::GetMatchEnd() const
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125 {
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126 if (valid_)
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127 {
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128 return matchEnd_;
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129 }
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130 else
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131 {
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132 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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133 }
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134 }
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135
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137 const char* StringMatcher::GetPointerBegin() const
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138 {
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139 return &GetMatchBegin()[0];
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140 }
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143 const char* StringMatcher::GetPointerEnd() const
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144 {
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145 return GetPointerBegin() + pattern_.size();
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146 }
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147 }