1 /*
2 *
3 * Copyright (c) 2003
4 * John Maddock
5 *
6 * Use, modification and distribution are subject to the
7 * Boost Software License, Version 1.0. (See accompanying file
8 * LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
9 *
10 */
11
12 /*
13 * LOCATION: see http://www.boost.org for most recent version.
14 * FILE regex_iterator_example_2.cpp
15 * VERSION see <boost/version.hpp>
16 * DESCRIPTION: regex_iterator example 2: searches a cpp file for class definitions,
17 * using global data.
18 */
19
20 #include <boost/regex.hpp>
21 #include <string>
22 #include <map>
23 #include <fstream>
24 #include <iostream>
25
26 using namespace std;
27
28 // purpose:
29 // takes the contents of a file in the form of a string
30 // and searches for all the C++ class definitions, storing
31 // their locations in a map of strings/int's
32
33 typedef std::map<std::string, std::string::difference_type, std::less<std::string> > map_type;
34
35 const char* re =
36 // possibly leading whitespace:
37 "^[[:space:]]*"
38 // possible template declaration:
39 "(template[[:space:]]*<[^;:{]+>[[:space:]]*)?"
40 // class or struct:
41 "(class|struct)[[:space:]]*"
42 // leading declspec macros etc:
43 "("
44 "\\<\\w+\\>"
45 "("
46 "[[:blank:]]*\\([^)]*\\)"
47 ")?"
48 "[[:space:]]*"
49 ")*"
50 // the class name
51 "(\\<\\w*\\>)[[:space:]]*"
52 // template specialisation parameters
53 "(<[^;:{]+>)?[[:space:]]*"
54 // terminate in { or :
55 "(\\{|:[^;\\{()]*\\{)";
56
57
58 boost::regex expression(re);
59 map_type class_index;
60
regex_callback(const boost::match_results<std::string::const_iterator> & what)61 bool regex_callback(const boost::match_results<std::string::const_iterator>& what)
62 {
63 // what[0] contains the whole string
64 // what[5] contains the class name.
65 // what[6] contains the template specialisation if any.
66 // add class name and position to map:
67 class_index[what[5].str() + what[6].str()] = what.position(5);
68 return true;
69 }
70
load_file(std::string & s,std::istream & is)71 void load_file(std::string& s, std::istream& is)
72 {
73 s.erase();
74 if(is.bad()) return;
75 s.reserve(static_cast<std::string::size_type>(is.rdbuf()->in_avail()));
76 char c;
77 while(is.get(c))
78 {
79 if(s.capacity() == s.size())
80 s.reserve(s.capacity() * 3);
81 s.append(1, c);
82 }
83 }
84
main(int argc,const char ** argv)85 int main(int argc, const char** argv)
86 {
87 std::string text;
88 for(int i = 1; i < argc; ++i)
89 {
90 cout << "Processing file " << argv[i] << endl;
91 std::ifstream fs(argv[i]);
92 load_file(text, fs);
93 fs.close();
94 // construct our iterators:
95 boost::sregex_iterator m1(text.begin(), text.end(), expression);
96 boost::sregex_iterator m2;
97 std::for_each(m1, m2, ®ex_callback);
98 // copy results:
99 cout << class_index.size() << " matches found" << endl;
100 map_type::iterator c, d;
101 c = class_index.begin();
102 d = class_index.end();
103 while(c != d)
104 {
105 cout << "class \"" << (*c).first << "\" found at index: " << (*c).second << endl;
106 ++c;
107 }
108 class_index.erase(class_index.begin(), class_index.end());
109 }
110 return 0;
111 }
112
113
114
115