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- /*
- *
- * Copyright (c) 1998-2002
- * John Maddock
- *
- * Use, modification and distribution are subject to the
- * Boost Software License, Version 1.0. (See accompanying file
- * LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- *
- */
- /*
- * LOCATION: see http://www.boost.org for most recent version.
- * FILE regex_grep_example_3.cpp
- * VERSION see <boost/version.hpp>
- * DESCRIPTION: regex_grep example 3: searches a cpp file for class definitions,
- * using a bound member function callback.
- */
- #include <boost/regex.hpp>
- #include <string>
- #include <map>
- #include <functional>
- #include <boost/detail/workaround.hpp>
- // purpose:
- // takes the contents of a file in the form of a string
- // and searches for all the C++ class definitions, storing
- // their locations in a map of strings/int's
- typedef std::map<std::string, std::string::difference_type, std::less<std::string> > map_type;
- const char* re =
- // possibly leading whitespace:
- "^[[:space:]]*"
- // possible template declaration:
- "(template[[:space:]]*<[^;:{]+>[[:space:]]*)?"
- // class or struct:
- "(class|struct)[[:space:]]*"
- // leading declspec macros etc:
- "("
- "\\<\\w+\\>"
- "("
- "[[:blank:]]*\\([^)]*\\)"
- ")?"
- "[[:space:]]*"
- ")*"
- // the class name
- "(\\<\\w*\\>)[[:space:]]*"
- // template specialisation parameters
- "(<[^;:{]+>)?[[:space:]]*"
- // terminate in { or :
- "(\\{|:[^;\\{()]*\\{)";
- class class_index
- {
- boost::regex expression;
- map_type index;
- std::string::const_iterator base;
- bool grep_callback(boost::match_results<std::string::const_iterator> what);
- public:
- map_type& get_map() { return index; }
- void IndexClasses(const std::string& file);
- class_index()
- : expression(re) {}
- };
- bool class_index::grep_callback(boost::match_results<std::string::const_iterator> what)
- {
- // what[0] contains the whole string
- // what[5] contains the class name.
- // what[6] contains the template specialisation if any.
- // add class name and position to map:
- index[std::string(what[5].first, what[5].second) + std::string(what[6].first, what[6].second)] =
- what[5].first - base;
- return true;
- }
- void class_index::IndexClasses(const std::string& file)
- {
- std::string::const_iterator start, end;
- start = file.begin();
- end = file.end();
- base = start;
- #if BOOST_WORKAROUND(_MSC_VER, < 1300) && !defined(_STLP_VERSION)
- boost::regex_grep(std::bind1st(std::mem_fun1(&class_index::grep_callback), this),
- start,
- end,
- expression);
- #elif defined(BOOST_NO_CXX98_BINDERS)
- boost::regex_grep(std::bind(&class_index::grep_callback, this, std::placeholders::_1),
- start,
- end,
- expression);
- #else
- boost::regex_grep(std::bind1st(std::mem_fun(&class_index::grep_callback), this),
- start,
- end,
- expression);
- #endif
- }
- #include <fstream>
- #include <iostream>
- using namespace std;
- void load_file(std::string& s, std::istream& is)
- {
- s.erase();
- if(is.bad()) return;
- s.reserve(static_cast<std::string::size_type>(is.rdbuf()->in_avail()));
- char c;
- while(is.get(c))
- {
- if(s.capacity() == s.size())
- s.reserve(s.capacity() * 3);
- s.append(1, c);
- }
- }
- int main(int argc, const char** argv)
- {
- std::string text;
- for(int i = 1; i < argc; ++i)
- {
- cout << "Processing file " << argv[i] << endl;
- std::ifstream fs(argv[i]);
- load_file(text, fs);
- fs.close();
- class_index idx;
- idx.IndexClasses(text);
- cout << idx.get_map().size() << " matches found" << endl;
- map_type::iterator c, d;
- c = idx.get_map().begin();
- d = idx.get_map().end();
- while(c != d)
- {
- cout << "class \"" << (*c).first << "\" found at index: " << (*c).second << endl;
- ++c;
- }
- }
- return 0;
- }
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