| /* |
| * |
| * 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_1.cpp |
| * VERSION see <boost/version.hpp> |
| * DESCRIPTION: regex_grep example 1: searches a cpp file for class definitions. |
| */ |
| |
| #include <string> |
| #include <map> |
| #include <boost/regex.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 : |
| "(\\{|:[^;\\{()]*\\{)"; |
| |
| boost::regex expression(re); |
| |
| class IndexClassesPred |
| { |
| map_type& m; |
| std::string::const_iterator base; |
| public: |
| IndexClassesPred(map_type& a, std::string::const_iterator b) : m(a), base(b) {} |
| bool operator()(const 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: |
| m[std::string(what[5].first, what[5].second) + std::string(what[6].first, what[6].second)] = |
| what[5].first - base; |
| return true; |
| } |
| private: |
| IndexClassesPred& operator=(const IndexClassesPred&); |
| }; |
| |
| void IndexClasses(map_type& m, const std::string& file) |
| { |
| std::string::const_iterator start, end; |
| start = file.begin(); |
| end = file.end(); |
| boost::regex_grep(IndexClassesPred(m, start), start, end, expression); |
| } |
| |
| |
| #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; |
| map_type m; |
| std::ifstream fs(argv[i]); |
| load_file(text, fs); |
| fs.close(); |
| IndexClasses(m, text); |
| cout << m.size() << " matches found" << endl; |
| map_type::iterator c, d; |
| c = m.begin(); |
| d = m.end(); |
| while(c != d) |
| { |
| cout << "class \"" << (*c).first << "\" found at index: " << (*c).second << endl; |
| ++c; |
| } |
| } |
| return 0; |
| } |
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