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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_2.cpp | |
15 | * VERSION see <boost/version.hpp> | |
16 | * DESCRIPTION: regex_grep example 2: searches a cpp file for class definitions, | |
17 | * using a global callback function. | |
18 | */ | |
19 | ||
b32b8144 | 20 | #include <boost/regex.hpp> |
7c673cae FG |
21 | #include <string> |
22 | #include <map> | |
23 | #include <boost/regex.hpp> | |
24 | ||
25 | // purpose: | |
26 | // takes the contents of a file in the form of a string | |
27 | // and searches for all the C++ class definitions, storing | |
28 | // their locations in a map of strings/int's | |
29 | ||
30 | typedef std::map<std::string, std::string::difference_type, std::less<std::string> > map_type; | |
31 | ||
32 | const char* re = | |
33 | // possibly leading whitespace: | |
34 | "^[[:space:]]*" | |
35 | // possible template declaration: | |
36 | "(template[[:space:]]*<[^;:{]+>[[:space:]]*)?" | |
37 | // class or struct: | |
38 | "(class|struct)[[:space:]]*" | |
39 | // leading declspec macros etc: | |
40 | "(" | |
41 | "\\<\\w+\\>" | |
42 | "(" | |
43 | "[[:blank:]]*\\([^)]*\\)" | |
44 | ")?" | |
45 | "[[:space:]]*" | |
46 | ")*" | |
47 | // the class name | |
48 | "(\\<\\w*\\>)[[:space:]]*" | |
49 | // template specialisation parameters | |
50 | "(<[^;:{]+>)?[[:space:]]*" | |
51 | // terminate in { or : | |
52 | "(\\{|:[^;\\{()]*\\{)"; | |
53 | ||
54 | ||
55 | boost::regex expression(re); | |
56 | map_type class_index; | |
57 | std::string::const_iterator base; | |
58 | ||
59 | bool grep_callback(const boost::match_results<std::string::const_iterator>& what) | |
60 | { | |
61 | // what[0] contains the whole string | |
62 | // what[5] contains the class name. | |
63 | // what[6] contains the template specialisation if any. | |
64 | // add class name and position to map: | |
65 | class_index[std::string(what[5].first, what[5].second) + std::string(what[6].first, what[6].second)] = | |
66 | what[5].first - base; | |
67 | return true; | |
68 | } | |
69 | ||
70 | void IndexClasses(const std::string& file) | |
71 | { | |
72 | std::string::const_iterator start, end; | |
73 | start = file.begin(); | |
74 | end = file.end(); | |
75 | base = start; | |
76 | boost::regex_grep(grep_callback, start, end, expression); | |
77 | } | |
78 | ||
79 | #include <fstream> | |
80 | #include <iostream> | |
81 | ||
82 | using namespace std; | |
83 | ||
84 | void load_file(std::string& s, std::istream& is) | |
85 | { | |
86 | s.erase(); | |
87 | if(is.bad()) return; | |
88 | s.reserve(static_cast<std::string::size_type>(is.rdbuf()->in_avail())); | |
89 | char c; | |
90 | while(is.get(c)) | |
91 | { | |
92 | if(s.capacity() == s.size()) | |
93 | s.reserve(s.capacity() * 3); | |
94 | s.append(1, c); | |
95 | } | |
96 | } | |
97 | ||
98 | int main(int argc, const char** argv) | |
99 | { | |
100 | std::string text; | |
101 | for(int i = 1; i < argc; ++i) | |
102 | { | |
103 | cout << "Processing file " << argv[i] << endl; | |
104 | std::ifstream fs(argv[i]); | |
105 | load_file(text, fs); | |
106 | fs.close(); | |
107 | IndexClasses(text); | |
108 | cout << class_index.size() << " matches found" << endl; | |
109 | map_type::iterator c, d; | |
110 | c = class_index.begin(); | |
111 | d = class_index.end(); | |
112 | while(c != d) | |
113 | { | |
114 | cout << "class \"" << (*c).first << "\" found at index: " << (*c).second << endl; | |
115 | ++c; | |
116 | } | |
117 | class_index.erase(class_index.begin(), class_index.end()); | |
118 | } | |
119 | return 0; | |
120 | } | |
121 | ||
122 | ||
123 |