regex-component-matcher.cpp
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5  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
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21  * @author Yingdi Yu <http://irl.cs.ucla.edu/~yingdi/>
22  */
23 
26 
27 namespace ndn {
28 
30  shared_ptr<RegexBackrefManager> backrefManager,
31  bool isExactMatch)
32  : RegexMatcher(expr, EXPR_COMPONENT, std::move(backrefManager))
33  , m_isExactMatch(isExactMatch)
34 {
35  compile();
36 }
37 
38 void
40 {
41  m_componentRegex.assign(m_expr);
42 
43  m_pseudoMatchers.clear();
44  m_pseudoMatchers.push_back(make_shared<RegexPseudoMatcher>());
45 
46  for (size_t i = 1; i <= m_componentRegex.mark_count(); i++) {
47  m_pseudoMatchers.push_back(make_shared<RegexPseudoMatcher>());
48  m_backrefManager->pushRef(m_pseudoMatchers.back());
49  }
50 }
51 
52 bool
53 RegexComponentMatcher::match(const Name& name, size_t offset, size_t len)
54 {
55  m_matchResult.clear();
56 
57  if (m_expr.empty()) {
58  m_matchResult.push_back(name.get(offset));
59  return true;
60  }
61 
62  if (!m_isExactMatch)
63  NDN_THROW(Error("Non-exact component search is not supported yet"));
64 
65  std::smatch subResult;
66  std::string targetStr = name.get(offset).toUri();
67  if (std::regex_match(targetStr, subResult, m_componentRegex)) {
68  for (size_t i = 1; i <= m_componentRegex.mark_count(); i++) {
69  m_pseudoMatchers[i]->resetMatchResult();
70  m_pseudoMatchers[i]->setMatchResult(subResult[i]);
71  }
72  m_matchResult.push_back(name.get(offset));
73  return true;
74  }
75 
76  return false;
77 }
78 
79 } // namespace ndn
Definition: data.cpp:26
bool match(const Name &name, size_t offset, size_t len=1) override
RegexComponentMatcher(const std::string &expr, shared_ptr< RegexBackrefManager > backrefManager, bool isExactMatch=true)
Create a RegexComponent matcher from expr.
STL namespace.
#define NDN_THROW(e)
Definition: exception.hpp:61
shared_ptr< RegexBackrefManager > m_backrefManager
void toUri(std::ostream &os) const
Write *this to the output stream, escaping characters according to the NDN URI Scheme.
std::vector< name::Component > m_matchResult
Represents an absolute name.
Definition: name.hpp:43
const std::string m_expr
const Component & get(ssize_t i) const
Get the component at the given index.
Definition: name.hpp:157
void compile() override
Compile the regular expression to generate the more matchers when necessary.