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1 | /* |
2 | * | |
3 | * Copyright (c) 1998-2002 | |
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_grep_example_1.cpp | |
15 | * VERSION see <boost/version.hpp> | |
16 | * DESCRIPTION: regex_grep example 1: searches a cpp file for class definitions. | |
17 | */ | |
18 | ||
b32b8144 | 19 | #include <boost/regex.hpp> |
7c673cae FG |
20 | #include <string> |
21 | #include <map> | |
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22 | |
23 | // purpose: | |
24 | // takes the contents of a file in the form of a string | |
25 | // and searches for all the C++ class definitions, storing | |
26 | // their locations in a map of strings/int's | |
27 | ||
28 | typedef std::map<std::string, std::string::difference_type, std::less<std::string> > map_type; | |
29 | ||
30 | const char* re = | |
31 | // possibly leading whitespace: | |
32 | "^[[:space:]]*" | |
33 | // possible template declaration: | |
34 | "(template[[:space:]]*<[^;:{]+>[[:space:]]*)?" | |
35 | // class or struct: | |
36 | "(class|struct)[[:space:]]*" | |
37 | // leading declspec macros etc: | |
38 | "(" | |
39 | "\\<\\w+\\>" | |
40 | "(" | |
41 | "[[:blank:]]*\\([^)]*\\)" | |
42 | ")?" | |
43 | "[[:space:]]*" | |
44 | ")*" | |
45 | // the class name | |
46 | "(\\<\\w*\\>)[[:space:]]*" | |
47 | // template specialisation parameters | |
48 | "(<[^;:{]+>)?[[:space:]]*" | |
49 | // terminate in { or : | |
50 | "(\\{|:[^;\\{()]*\\{)"; | |
51 | ||
52 | boost::regex expression(re); | |
53 | ||
54 | class IndexClassesPred | |
55 | { | |
56 | map_type& m; | |
57 | std::string::const_iterator base; | |
58 | public: | |
59 | IndexClassesPred(map_type& a, std::string::const_iterator b) : m(a), base(b) {} | |
60 | bool operator()(const boost::match_results<std::string::const_iterator>& what) | |
61 | { | |
62 | // what[0] contains the whole string | |
63 | // what[5] contains the class name. | |
64 | // what[6] contains the template specialisation if any. | |
65 | // add class name and position to map: | |
66 | m[std::string(what[5].first, what[5].second) + std::string(what[6].first, what[6].second)] = | |
67 | what[5].first - base; | |
68 | return true; | |
69 | } | |
70 | private: | |
71 | IndexClassesPred& operator=(const IndexClassesPred&); | |
72 | }; | |
73 | ||
74 | void IndexClasses(map_type& m, const std::string& file) | |
75 | { | |
76 | std::string::const_iterator start, end; | |
77 | start = file.begin(); | |
78 | end = file.end(); | |
79 | boost::regex_grep(IndexClassesPred(m, start), start, end, expression); | |
80 | } | |
81 | ||
82 | ||
83 | #include <fstream> | |
84 | #include <iostream> | |
85 | ||
86 | using namespace std; | |
87 | ||
88 | void load_file(std::string& s, std::istream& is) | |
89 | { | |
90 | s.erase(); | |
91 | if(is.bad()) return; | |
92 | s.reserve(static_cast<std::string::size_type>(is.rdbuf()->in_avail())); | |
93 | char c; | |
94 | while(is.get(c)) | |
95 | { | |
96 | if(s.capacity() == s.size()) | |
97 | s.reserve(s.capacity() * 3); | |
98 | s.append(1, c); | |
99 | } | |
100 | } | |
101 | ||
102 | int main(int argc, const char** argv) | |
103 | { | |
104 | std::string text; | |
105 | for(int i = 1; i < argc; ++i) | |
106 | { | |
107 | cout << "Processing file " << argv[i] << endl; | |
108 | map_type m; | |
109 | std::ifstream fs(argv[i]); | |
110 | load_file(text, fs); | |
111 | fs.close(); | |
112 | IndexClasses(m, text); | |
113 | cout << m.size() << " matches found" << endl; | |
114 | map_type::iterator c, d; | |
115 | c = m.begin(); | |
116 | d = m.end(); | |
117 | while(c != d) | |
118 | { | |
119 | cout << "class \"" << (*c).first << "\" found at index: " << (*c).second << endl; | |
120 | ++c; | |
121 | } | |
122 | } | |
123 | return 0; | |
124 | } | |
125 | ||
126 | ||
127 | ||
128 | ||
129 | ||
130 | ||
131 |