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Remove tinyxml2 dependency.

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gm 2016-06-25 17:33:55 +12:00 committed by Howard Hinnant
parent 33cdfc6485
commit d252405747
1 changed files with 150 additions and 33 deletions
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183
tz.cpp
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@ -84,7 +84,6 @@
#include <memory>
#include <sstream>
#include <string>
#include <tuple>
#include <vector>
#include <sys/stat.h>
@ -123,13 +122,7 @@
#include <curl/curl.h>
#endif
#if TIMEZONE_MAPPING
// See comments in tz.h regarding the XML mapping file.
#include "tinyxml2.h"
#endif
#if _WIN32
static CONSTDATA char folder_delimiter = '\\';
namespace
@ -352,36 +345,160 @@ get_download_mapping_file(const std::string& version)
return file;
}
// Parse this XML file:
// http://unicode.org/repos/cldr/trunk/common/supplemental/windowsZones.xml
// The parsing method is designed to be simple and quick. It is not overly
// forgiving of change but it should diagnose basic format issues.
// See timezone_mapping structure for more info.
static
std::vector<date::detail::timezone_mapping>
load_zone_mappings_from_xml_file(const std::string& input_path)
std::vector<detail::timezone_mapping>
load_timezone_mappings_from_xml_file(const std::string& input_path)
{
using tinyxml2::XMLDocument;
std::vector<date::detail::timezone_mapping> zone_map_list;
XMLDocument doc;
std::size_t line_num = 0;
std::vector<detail::timezone_mapping> mappings;
std::string line;
auto result = doc.LoadFile(input_path.c_str());
if (result != tinyxml2::XML_SUCCESS)
std::ifstream is(input_path);
if (!is.is_open())
{
std::string msg = "Could not load the timezone mapping file at \"";
// We don't emit file exceptions because that's an implementation detail.
std::string msg = "Error opening time zone mapping file \"";
msg += input_path;
msg += '\"';
msg += "\".";
throw std::runtime_error(msg);
}
auto supplementalData = doc.FirstChildElement("supplementalData");
auto windowsZones = supplementalData->FirstChildElement("windowsZones");
auto mapTimeZones = windowsZones->FirstChildElement("mapTimezones");
for (auto mapZone = mapTimeZones->FirstChildElement("mapZone");
mapZone != nullptr; mapZone = mapZone->NextSiblingElement())
auto error = [&input_path, &line_num](const char* info)
{
auto other = mapZone->Attribute("other");
auto territory = mapZone->Attribute("territory");
auto type = mapZone->Attribute("type");
zone_map_list.emplace_back(other, territory, type);
std::string msg = "Error loading time zone mapping file \"";
msg += input_path;
msg += "\" at line ";
msg += std::to_string(line_num);
msg += ": ";
msg += info;
throw std::runtime_error(msg);
};
// [optional space]a="b"
auto read_attribute = [&line_num, &line, &error]
(const char* name, std::string& value, std::size_t startPos)
->std::size_t
{
value.clear();
// Skip leading space before attribute name.
std::size_t spos = line.find_first_not_of(' ', startPos);
if (spos == std::string::npos)
spos = startPos;
// Assume everything up to next = is the attribute name
// and that an = will always delimit that.
std::size_t epos = line.find('=', spos);
if (epos == std::string::npos)
error("Expected \'=\' right after attribute name.");
std::size_t name_len = epos - spos;
// Expect the name we find matches the name we expect.
if (line.compare(spos, name_len, name) != 0)
{
std::string msg;
msg = "Expected attribute name \'";
msg += name;
msg += "\' around position ";
msg += std::to_string(spos);
msg += " but found something else.";
error(msg.c_str());
}
++epos; // Skip the '=' that is after the attribute name.
spos = epos;
if (spos < line.length() && line[spos] == '\"')
++spos; // Skip the quote that is before the attribute value.
else
{
std::string msg = "Expected '\"' to begin value of attribute \'";
msg += name;
msg += "\'.";
error(msg.c_str());
}
epos = line.find('\"', spos);
if (epos == std::string::npos)
{
std::string msg = "Expected '\"' to end value of attribute \'";
msg += name;
msg += "\'.";
error(msg.c_str());
}
// Extract everything in between the quotes. Note no escaping is done.
std::size_t value_len = epos - spos;
value.assign(line, spos, value_len);
++epos; // Skip the quote that is after the attribute value;
return epos;
};
// Quick but not overly forgiving XML mapping file processing.
bool mapTimezonesOpenTagFound = false;
bool mapTimezonesCloseTagFound = false;
bool mapZoneOpenTagFound = false;
bool mapTZoneCloseTagFound = false;
std::size_t mapZonePos = std::string::npos;
std::size_t mapTimezonesPos = std::string::npos;
CONSTDATA char mapTimeZonesOpeningTag[] = { "<mapTimezones " };
CONSTDATA char mapZoneOpeningTag[] = { "<mapZone " };
CONSTDATA std::size_t mapZoneOpeningTagLen = sizeof(mapZoneOpeningTag) /
sizeof(mapZoneOpeningTag[0]) - 1;
while (!mapTimezonesOpenTagFound)
{
std::getline(is, line);
++line_num;
if (is.eof())
{
// If there is no mapTimezones tag is it an error?
// Perhaps if there are no mapZone mappings it might be ok for
// its parent mapTimezones element to be missing?
// We treat this as an error though on the assumption that if there
// really are no mappings we should still get a mapTimezones parent
// element but no mapZone elements inside. Assuming we must
// find something will hopefully at least catch more drastic formatting
// changes or errors than if we don't do this and assume nothing found.
error("Expected a mapTimezones opening tag.");
}
mapTimezonesPos = line.find(mapTimeZonesOpeningTag);
mapTimezonesOpenTagFound = (mapTimezonesPos != std::string::npos);
}
return zone_map_list;
// NOTE: We could extract the version info that follows the opening
// mapTimezones tag and compare that to the version of other data we have.
// I would have expected them to be kept in synch but testing has shown
// it is typically does not match anyway. So what's the point?
while (!mapTimezonesCloseTagFound)
{
std::getline(is, line);
++line_num;
if (is.eof())
error("Expected a mapTimezones closing tag.");
if (line.empty())
continue;
mapZonePos = line.find(mapZoneOpeningTag);
if (mapZonePos != std::string::npos)
{
mapZonePos += mapZoneOpeningTagLen;
detail::timezone_mapping zm{};
std::size_t pos = read_attribute("other", zm.other, mapZonePos);
pos = read_attribute("territory", zm.territory, pos);
read_attribute("type", zm.type, pos);
mappings.push_back(std::move(zm));
continue;
}
mapTimezonesPos = line.find("</mapTimezones>");
mapTimezonesCloseTagFound = (mapTimezonesPos != std::string::npos);
if (!mapTimezonesCloseTagFound)
{
std::size_t commentPos = line.find("<!--");
if (commentPos == std::string::npos)
error("Unexpected mapping record found. A xml mapZone or comment "
"attribute or mapTimezones closing tag was expected.");
}
}
is.close();
return mappings;
}
static
@ -2231,7 +2348,7 @@ remove_folder_and_subfolders(const std::string& folder)
std::string filename;
struct stat statbuf;
size_t folder_len = folder.length();
std::size_t folder_len = folder.length();
struct dirent* p = nullptr;
closedir_ptr d(opendir(folder.c_str()));
@ -2242,9 +2359,9 @@ remove_folder_and_subfolders(const std::string& folder)
continue;
// + 2 for path delimiter and nul terminator.
size_t buf_len = folder_len + strlen(p->d_name) + 2;
std::size_t buf_len = folder_len + strlen(p->d_name) + 2;
filename.resize(buf_len);
size_t path_len = static_cast<size_t>(
std::size_t path_len = static_cast<std::size_t>(
snprintf(&filename[0], buf_len, "%s/%s", folder.c_str(), p->d_name));
assert(path_len == buf_len - 1);
filename.resize(path_len);
@ -2715,7 +2832,7 @@ init_tzdb()
#if TIMEZONE_MAPPING
std::string mapping_file = path + "windowsZones.xml";
db.mappings = load_zone_mappings_from_xml_file(mapping_file);
db.mappings = load_timezone_mappings_from_xml_file(mapping_file);
sort_zone_mappings(db.mappings);
get_windows_timezone_info(db.native_zones);
#endif // TIMEZONE_MAPPING
@ -2942,8 +3059,8 @@ current_zone()
throw std::runtime_error("readlink failure");
result.resize(sz);
const char zonepath[] = "/usr/share/zoneinfo/";
const size_t zonepath_len = sizeof(zonepath)/sizeof(zonepath[0])-1;
const size_t pos = result.find(zonepath);
const std::size_t zonepath_len = sizeof(zonepath)/sizeof(zonepath[0])-1;
const std::size_t pos = result.find(zonepath);
if (pos != result.npos)
result.erase(0, zonepath_len+pos);
return locate_zone(result);