forked from boostorg/regex
Add module support and tests. (#174)
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139
test/module/regex_search_example.cpp
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139
test/module/regex_search_example.cpp
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/*
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*
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* Copyright (c) 1998-2022
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* John Maddock
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*
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* Use, modification and distribution are subject to the
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* Boost Software License, Version 1.0. (See accompanying file
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* LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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*
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*/
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/*
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* LOCATION: see http://www.boost.org for most recent version.
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* FILE regex_search_example.cpp
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* VERSION see <boost/version.hpp>
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* DESCRIPTION: regex_search example: searches a cpp file for class definitions.
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*/
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#if (defined(__cpp_lib_modules) || (defined(_MSC_FULL_VER) && (_MSC_FULL_VER >= 193833135))) && !defined(TEST_HEADERS)
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import std;
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#elif defined(MSVC_EXPERIMENTAL_STD_MODULE) && !defined(TEST_HEADERS)
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import std.core;
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#else
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#include <string>
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#include <map>
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#include <iostream>
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#include <fstream>
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#endif
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#ifdef TEST_HEADERS
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#include <boost/regex.hpp>
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#else
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import boost.regex;
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#endif
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// purpose:
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// takes the contents of a file in the form of a string
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// and searches for all the C++ class definitions, storing
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// their locations in a map of strings/int's
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typedef std::map<std::string, std::string::difference_type, std::less<std::string> > map_type;
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const char* re =
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// possibly leading whitespace:
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"^[[:space:]]*"
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// possible template declaration:
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"(template[[:space:]]*<[^;:{]+>[[:space:]]*)?"
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// class or struct:
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"(class|struct)[[:space:]]*"
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// leading declspec macros etc:
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"("
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"\\<\\w+\\>"
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"("
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"[[:blank:]]*\\([^)]*\\)"
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")?"
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"[[:space:]]*"
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")*"
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// the class name
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"(\\<\\w*\\>)[[:space:]]*"
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// template specialisation parameters
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"(<[^;:{]+>)?[[:space:]]*"
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// terminate in { or :
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"(\\{|:[^;\\{()]*\\{)";
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boost::regex expression(re);
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void IndexClasses(map_type& m, const std::string& file)
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{
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std::string::const_iterator start, end;
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start = file.begin();
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end = file.end();
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boost::match_results<std::string::const_iterator> what;
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boost::match_flag_type flags = boost::match_default;
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while(boost::regex_search(start, end, what, expression, flags))
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{
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// what[0] contains the whole string
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// what[5] contains the class name.
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// what[6] contains the template specialisation if any.
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// add class name and position to map:
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m[std::string(what[5].first, what[5].second) + std::string(what[6].first, what[6].second)] =
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what[5].first - file.begin();
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// update search position:
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start = what[0].second;
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// update flags:
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flags |= boost::match_prev_avail;
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flags |= boost::match_not_bob;
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}
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}
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using namespace std;
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void load_file(std::string& s, std::istream& is)
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{
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s.erase();
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if(is.bad()) return;
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s.reserve(static_cast<std::string::size_type>(is.rdbuf()->in_avail()));
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char c;
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while(is.get(c))
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{
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if(s.capacity() == s.size())
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s.reserve(s.capacity() * 3);
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s.append(1, c);
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}
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}
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int main(int argc, const char** argv)
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{
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std::string text;
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for(int i = 1; i < argc; ++i)
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{
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cout << "Processing file " << argv[i] << endl;
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map_type m;
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std::ifstream fs(argv[i]);
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load_file(text, fs);
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fs.close();
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IndexClasses(m, text);
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cout << m.size() << " matches found" << endl;
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map_type::iterator c, d;
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c = m.begin();
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d = m.end();
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while(c != d)
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{
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cout << "class \"" << (*c).first << "\" found at index: " << (*c).second << endl;
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++c;
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}
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}
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return 0;
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}
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