When using GCC4.8, use manual lexical analysis instead of regular expressions.

This commit is contained in:
RonxBulld 2021-04-22 18:16:15 +08:00
parent e01352fabe
commit 07c6eb5d42

View File

@ -33,13 +33,23 @@ THE SOFTWARE.
#include <list>
#include <map>
#include <memory>
#include <regex>
#include <sstream>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
#include <algorithm>
#if defined(__GNUC__)
# if (__GNUC__ * 10 + __GNUC_MINOR__) < 49
# define NO_REGEX
# endif
#endif
#ifndef NO_REGEX
# include <regex>
#endif // NO_REGEX
#ifdef __cpp_lib_optional
#include <optional>
@ -519,6 +529,7 @@ namespace cxxopts
namespace values
{
#ifndef NO_REGEX
namespace
{
std::basic_regex<char> integer_pattern
@ -528,6 +539,7 @@ namespace cxxopts
std::basic_regex<char> falsy_pattern
("(f|F)(alse)?|0");
} // namespace
#endif // NO_REGEX
namespace detail
{
@ -595,6 +607,34 @@ namespace cxxopts
void
integer_parser(const std::string& text, T& value)
{
#ifdef NO_REGEX
if (text.empty()) {
throw_or_mimic<argument_incorrect_type>(text);
}
String part[3];
const char *pdata = text.c_str();
if (*pdata == '-') {
pdata += 1;
part[0] = "-";
}
if (strncmp(pdata, "0x", 2) == 0) {
pdata += 2;
part[1] = "0x";
}
if (*pdata != '\0') {
part[2] = String(pdata);
} else {
throw_or_mimic<argument_incorrect_type>(text);
}
using US = typename std::make_unsigned<T>::type;
constexpr bool is_signed = std::numeric_limits<T>::is_signed;
const bool negative = part[0].length() > 0;
const uint8_t base = part[1].length() > 0 ? 16 : 10;
String value_match = part[2];
auto begin_it = value_match.begin();
auto end_it = value_match.end();
#else
std::smatch match;
std::regex_match(text, match, integer_pattern);
@ -616,10 +656,13 @@ namespace cxxopts
const uint8_t base = match.length(2) > 0 ? 16 : 10;
auto value_match = match[3];
auto &begin_it = value_match.first;
auto &end_it = value_match.second;
#endif // NO_REGEX
US result = 0;
for (auto iter = value_match.first; iter != value_match.second; ++iter)
for (auto iter = begin_it; iter != end_it; ++iter)
{
US digit = 0;
@ -731,8 +774,21 @@ namespace cxxopts
void
parse_value(const std::string& text, bool& value)
{
#ifdef NO_REGEX
String result;
const char *pdata = text.c_str();
if (*pdata == 't' || *pdata == 'T') {
pdata += 1;
if (strncmp(pdata, "rue\0", 4) == 0) {
result = text;
}
} else if (strncmp(pdata, "1\0", 2) == 0) {
result = text;
}
#else
std::smatch result;
std::regex_match(text, result, truthy_pattern);
#endif
if (!result.empty())
{
@ -740,7 +796,19 @@ namespace cxxopts
return;
}
#ifdef NO_REGEX
pdata = text.c_str();
if (*pdata == 'f' || *pdata == 'F') {
pdata += 1;
if (strncmp(pdata, "alse\0", 5) == 0) {
result = text;
}
} else if (strncmp(pdata, "0\0", 2) == 0) {
result = text;
}
#else
std::regex_match(text, result, falsy_pattern);
#endif
if (!result.empty())
{
value = false;
@ -1579,11 +1647,13 @@ namespace cxxopts
constexpr size_t OPTION_LONGEST = 30;
constexpr size_t OPTION_DESC_GAP = 2;
#ifndef NO_REGEX
std::basic_regex<char> option_matcher
("--([[:alnum:]][-_[:alnum:]]+)(=(.*))?|-([[:alnum:]]+)");
std::basic_regex<char> option_specifier
("(([[:alnum:]]),)?[ ]*([[:alnum:]][-_[:alnum:]]*)?");
#endif // NO_REGEX
String
format_option
@ -1794,6 +1864,27 @@ OptionAdder::operator()
std::string arg_help
)
{
#ifdef NO_REGEX
String result[4];
const char *pdata = opts.c_str();
if (isalnum(*pdata) && *(pdata + 1) == ',') {
result[2] = String(1, *pdata);
pdata += 2;
}
while (*pdata == ' ') { pdata += 1; }
if (isalnum(*pdata)) {
const char *store = pdata;
pdata += 1;
while (isalnum(*pdata) || *pdata == '-' || *pdata == '_') {
pdata += 1;
}
if (*pdata == '\0') {
result[3] = String(store, pdata - store);
} else {
throw_or_mimic<invalid_option_format_error>(opts);
}
}
#else
std::match_results<const char*> result;
std::regex_match(opts.c_str(), result, option_specifier);
@ -1802,6 +1893,8 @@ OptionAdder::operator()
throw_or_mimic<invalid_option_format_error>(opts);
}
#endif
const auto& short_match = result[2];
const auto& long_match = result[3];
@ -1813,6 +1906,20 @@ OptionAdder::operator()
throw_or_mimic<invalid_option_format_error>(opts);
}
#ifdef NO_REGEX
auto option_names = []
(
const String &short_,
const String &long_
)
{
if (long_.length() == 1)
{
return std::make_tuple(long_, short_);
}
return std::make_tuple(short_, long_);
}(short_match, long_match);
#else
auto option_names = []
(
const std::sub_match<const char*>& short_,
@ -1825,6 +1932,7 @@ OptionAdder::operator()
}
return std::make_tuple(short_.str(), long_.str());
}(short_match, long_match);
#endif
m_options.add_option
(
@ -1986,11 +2094,47 @@ OptionParser::parse(int argc, const char* const* argv)
++current;
break;
}
#ifdef NO_REGEX
String result[5];
const char *pdata = argv[current];
bool matched = false;
if (strncmp(pdata, "--", 2) == 0) {
pdata += 2;
if (isalnum(*pdata)) {
result[1].push_back(*pdata);
pdata += 1;
while (isalnum(*pdata) || *pdata == '-' || *pdata == '_') {
result[1].push_back(*pdata);
pdata += 1;
}
if (result[1].length() > 1) {
if (*pdata == '=') {
result[2] = String(pdata);
pdata += 1;
if (*pdata != '\0') {
result[3] = String(pdata);
}
matched = true;
} else if (*pdata == '\0') {
matched = true;
}
}
}
} else if (strncmp(pdata, "-", 1) == 0) {
pdata += 1;
while (isalnum(*pdata)) {
result[4].push_back(*pdata);
pdata += 1;
}
matched = !result[4].empty() && *pdata == '\0';
}
#else
std::match_results<const char*> result;
std::regex_match(argv[current], result, option_matcher);
const bool matched = !result.empty();
#endif
if (result.empty())
if (!matched)
{
//not a flag
@ -2381,4 +2525,6 @@ Options::group_help(const std::string& group) const
} // namespace cxxopts
#undef NO_REGEX
#endif //CXXOPTS_HPP_INCLUDED