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| Original file line number | Diff line number | Diff line change |
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| // Copyright (c) 2007-2017 Hartmut Kaiser | ||
| // | ||
| // Distributed under 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) | ||
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| #if !defined(HPX_UTIL_REGEX_FROM_PATTERN_DEC_13_2017_1016AM) | ||
| #define HPX_UTIL_REGEX_FROM_PATTERN_DEC_13_2017_1016AM | ||
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| #include <hpx/config.hpp> | ||
| #include <hpx/error_code.hpp> | ||
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| #include <string> | ||
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| namespace hpx { namespace util | ||
| { | ||
| HPX_EXPORT std::string regex_from_pattern(std::string const& pattern, | ||
| error_code& ec = throws); | ||
| }} | ||
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| #endif |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| // Copyright (c) 2007-2017 Hartmut Kaiser | ||
| // | ||
| // Distributed under 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) | ||
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| #include <hpx/config.hpp> | ||
| #include <hpx/error_code.hpp> | ||
| #include <hpx/util/regex_from_pattern.hpp> | ||
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| #include <string> | ||
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| #include <boost/regex.hpp> | ||
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| namespace hpx { namespace util | ||
| { | ||
| namespace detail | ||
| { | ||
| /////////////////////////////////////////////////////////////////////// | ||
| inline std::string | ||
| regex_from_character_set(std::string::const_iterator& it, | ||
| std::string::const_iterator end, error_code& ec) | ||
| { | ||
| std::string::const_iterator start = it; | ||
| std::string result(1, *it); // copy '[' | ||
| if (*++it == '!') { | ||
| result.append(1, '^'); // negated character set | ||
| } | ||
| else if (*it == ']') { | ||
| HPX_THROWS_IF(ec, bad_parameter, "regex_from_character_set", | ||
| "Invalid pattern (empty character set) at: " + | ||
| std::string(start, end)); | ||
| return ""; | ||
| } | ||
| else { | ||
| result.append(1, *it); // append this character | ||
| } | ||
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| // copy while in character set | ||
| while (++it != end) { | ||
| result.append(1, *it); | ||
| if (*it == ']') | ||
| break; | ||
| } | ||
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| if (it == end || *it != ']') { | ||
| HPX_THROWS_IF(ec, bad_parameter, "regex_from_character_set", | ||
| "Invalid pattern (missing closing ']') at: " + | ||
| std::string(start, end)); | ||
| return ""; | ||
| } | ||
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| return result; | ||
| } | ||
| } | ||
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| std::string regex_from_pattern(std::string const& pattern, error_code& ec) | ||
| { | ||
| std::string result; | ||
| std::string::const_iterator end = pattern.end(); | ||
| for (std::string::const_iterator it = pattern.begin(); it != end; ++it) | ||
| { | ||
| char c = *it; | ||
| switch (c) { | ||
| case '*': | ||
| result.append(".*"); | ||
| break; | ||
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| case '?': | ||
| result.append(1, '.'); | ||
| break; | ||
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| case '[': | ||
| { | ||
| std::string r = | ||
| detail::regex_from_character_set(it, end, ec); | ||
| if (ec) return ""; | ||
| result.append(r); | ||
| } | ||
| break; | ||
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| case '\\': | ||
| if (++it == end) { | ||
| HPX_THROWS_IF(ec, bad_parameter, | ||
| "regex_from_pattern", | ||
| "Invalid escape sequence at: " + pattern); | ||
| return ""; | ||
| } | ||
| result.append(1, *it); | ||
| break; | ||
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| default: | ||
| result.append(1, c); | ||
| break; | ||
| } | ||
| } | ||
| return result; | ||
| } | ||
| }} |