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Merge pull request #54 from gmcode/master

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mapping file suggested changes.
This commit is contained in:
Howard Hinnant 2016-06-01 11:53:10 -04:00
commit 127ffdb35e
2 changed files with 90 additions and 37 deletions
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19
test/tz_test/validate.cpp
View File

@ -83,8 +83,8 @@ test_info(const date::time_zone* zone, const date::sys_info& info)
}
}
int
main()
void
tzmain()
{
using namespace date;
using namespace std::chrono;
@ -143,3 +143,18 @@ main()
std::cout << '\n';
}
}
int
main()
{
try
{
tzmain();
}
catch(const std::exception& ex)
{
std::cout << "An exception occured: " << ex.what() << std::endl;
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}

106
tz.cpp
View File

@ -50,15 +50,13 @@
#if TIMEZONE_MAPPING
// Timezone mapping maps native (e.g. Windows) timezone names to the "Standard" names
// used by this library.
// The mapping process parses a CSV file of mapping data and uses std::quoted to do that.
// Because std::quoted is a C++14 feature found in <iomanip> any platforms using
// the mapping process require C++14.
// Windows uses the mapping process so C++14 is required on Windows.
// VS2015 supports std::quoted but there is no -std=c++14 flag required to enable it.
// MinGW on Windows also requires the mapping process so -std=c++14 is required
// when using g++ or clang.
// On Linux/Mac, no mapping / CSV file is required so std::quoted and C++14 isn't needed
// and so on these platforms C++11 should work but C++14 is preferred even there too
// The mapping process parses a CSV file of mapping data where each line is of the format:
// "other","territory","type"<newline>
// e.g. "GMT Standard Time", "001", "Europe/London"
// and <newline>
// Windows typically uses CRLF, Linux/Unix/Mac OS use LF, and old Mac's use CR.
// On Linux/Mac, no mapping file is required as that is the native format already.
// C++11 should work but C++14 is preferred even there too
// because the date library in general works better with C++14.
#include <iomanip>
#endif
@ -381,19 +379,30 @@ static const detail::timezone_info* find_native_timezone_by_standard_name(
static std::vector<detail::timezone_mapping>
load_timezone_mappings_from_csv_file(const std::string& input_path)
{
size_t line = 1;
size_t line = 0;
std::vector<detail::timezone_mapping> mappings;
std::ifstream is(input_path, std::ios_base::in | std::ios_base::binary);
std::ifstream is(input_path,
#if _WIN32
std::ios_base::in // open in text mode on Win32, so getline will eat '\n' and '\r\n'
#else
std::ios_base::in | std::ios_base::binary
#endif
);
if (!is.is_open())
{
// We don't emit file exceptions because that's an implementation detail.
std::string msg = "Error opening time zone mapping file: ";
std::string msg = "Error opening time zone mapping file \"";
msg += input_path;
msg += "\".";
throw std::runtime_error(msg);
}
std::stringstream sis;
auto error = [&](const char* info)
{
std::string msg = "Error reading zone mapping file at line ";
std::string msg = "Error reading zone mapping file \"";
msg += input_path;
msg += "\" at line ";
msg += std::to_string(line);
msg += ": ";
msg += info;
@ -403,39 +412,68 @@ load_timezone_mappings_from_csv_file(const std::string& input_path)
auto read_field_delim = [&]()
{
char field_delim;
is.read(&field_delim, 1);
if (is.gcount() != 1 || field_delim != ',')
error("delimiter ',' expected");
sis.read(&field_delim, 1);
if (sis.gcount() != 1 || field_delim != ',')
error("delimiter ',' expected.");
};
std::string copyright;
for (int i = 0; i < 4; ++i)
getline(is, copyright);
bool blank = false;
for (;;)
{
std::getline(is, copyright);
++line; // Make sure our line number is in sync with however many copyright lines we have.
if (is.eof())
break;
if (copyright.empty())
{
--line;
blank = true;
break;
}
}
const int min_copyright_lines = 3;
if (!blank || line < min_copyright_lines)
{
std::string msg = "Expected at least ";
msg += std::to_string(min_copyright_lines);
msg += " lines of copyright notice followed by a blank line.";
error(msg.c_str());
}
++line;
std::string linebuf;
for (;;)
{
detail::timezone_mapping zm{};
std::getline(is, linebuf);
// Stop on error or first blank line.
// linebuf.size() is the length read but it excludes the length of any line delimiter actually read (e.g. LF/CRLF).
// If linebuf.size() is 0 it *might* not mean nothing was read (error) or eof, it could just
// indicate only a line delimiter was read. Use is.eof() to distinquish end of file from a blank line.
if (linebuf.empty()) // on eof linebuf will be empty.
{
if (is.eof())
break;
error("Formatting error. Blank lines not allowed.");
}
sis.clear();
sis.str(linebuf);
char ch;
is.read(&ch, 1);
if (is.eof())
break;
std::getline(is, zm.other, '\"');
sis.read(&ch, 1);
std::getline(sis, zm.other, '\"');
read_field_delim();
is.read(&ch, 1);
std::getline(is, zm.territory, '\"');
sis.read(&ch, 1);
std::getline(sis, zm.territory, '\"');
read_field_delim();
is.read(&ch, 1);
std::getline(is, zm.type, '\"');
is.read(&ch, 1);
if (is.gcount() != 1 || ch != '\n')
error("record delimiter LF expected");
if (is.fail() || is.eof())
error("unexpected end of file, file read error or formatting error.");
sis.read(&ch, 1);
std::getline(sis, zm.type, '\"');
sis.read(&ch, 1);
if (!sis.eof()) // Excess characters? We should have processed all in the line buffer.
error("Formatting error.");
++line;
mappings.push_back(std::move(zm));
}