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//
// DateTimeParser.cpp
//
// Library: Foundation
// Package: DateTime
// Module: DateTimeParser
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/DateTimeParser.h"
#include "Poco/DateTimeFormat.h"
#include "Poco/DateTime.h"
#include "Poco/Exception.h"
#include "Poco/Ascii.h"
namespace Poco {
#define SKIP_JUNK() \
while (it != end && !Ascii::isDigit(*it)) ++it
#define SKIP_DIGITS() \
while (it != end && Ascii::isDigit(*it)) ++it
#define PARSE_NUMBER(var) \
while (it != end && Ascii::isDigit(*it)) var = var*10 + ((*it++) - '0')
#define PARSE_NUMBER_N(var, n) \
{ int i = 0; while (i++ < n && it != end && Ascii::isDigit(*it)) var = var*10 + ((*it++) - '0'); }
#define PARSE_FRACTIONAL_N(var, n) \
{ int i = 0; while (i < n && it != end && Ascii::isDigit(*it)) { var = var*10 + ((*it++) - '0'); i++; } while (i++ < n) var *= 10; }
void DateTimeParser::parse(const std::string& fmt, const std::string& str, DateTime& dateTime, int& timeZoneDifferential)
{
if (fmt.empty() || str.empty())
throw SyntaxException("Empty string.");
int year = 0;
int month = 0;
int day = 0;
int hour = 0;
int minute = 0;
int second = 0;
int millis = 0;
int micros = 0;
int tzd = 0;
std::string::const_iterator it = str.begin();
std::string::const_iterator end = str.end();
std::string::const_iterator itf = fmt.begin();
std::string::const_iterator endf = fmt.end();
while (itf != endf && it != end)
{
if (*itf == '%')
{
if (++itf != endf)
{
switch (*itf)
{
case 'w':
case 'W':
while (it != end && Ascii::isSpace(*it)) ++it;
while (it != end && Ascii::isAlpha(*it)) ++it;
break;
case 'b':
case 'B':
month = parseMonth(it, end);
break;
case 'd':
case 'e':
case 'f':
SKIP_JUNK();
PARSE_NUMBER_N(day, 2);
break;
case 'm':
case 'n':
case 'o':
SKIP_JUNK();
PARSE_NUMBER_N(month, 2);
break;
case 'y':
SKIP_JUNK();
PARSE_NUMBER_N(year, 2);
if (year >= 69)
year += 1900;
else
year += 2000;
break;
case 'Y':
SKIP_JUNK();
PARSE_NUMBER_N(year, 4);
break;
case 'r':
SKIP_JUNK();
PARSE_NUMBER(year);
if (year < 1000)
{
if (year >= 69)
year += 1900;
else
year += 2000;
}
break;
case 'H':
case 'h':
SKIP_JUNK();
PARSE_NUMBER_N(hour, 2);
break;
case 'a':
case 'A':
hour = parseAMPM(it, end, hour);
break;
case 'M':
SKIP_JUNK();
PARSE_NUMBER_N(minute, 2);
break;
case 'S':
SKIP_JUNK();
PARSE_NUMBER_N(second, 2);
break;
case 's':
SKIP_JUNK();
PARSE_NUMBER_N(second, 2);
if (it != end && (*it == '.' || *it == ','))
{
++it;
PARSE_FRACTIONAL_N(millis, 3);
PARSE_FRACTIONAL_N(micros, 3);
SKIP_DIGITS();
}
break;
case 'i':
SKIP_JUNK();
PARSE_NUMBER_N(millis, 3);
break;
case 'c':
SKIP_JUNK();
PARSE_NUMBER_N(millis, 1);
millis *= 100;
break;
case 'F':
SKIP_JUNK();
PARSE_FRACTIONAL_N(millis, 3);
PARSE_FRACTIONAL_N(micros, 3);
SKIP_DIGITS();
break;
case 'z':
case 'Z':
tzd = parseTZD(it, end);
break;
}
++itf;
}
}
else ++itf;
}
if (month == 0) month = 1;
if (day == 0) day = 1;
if (DateTime::isValid(year, month, day, hour, minute, second, millis, micros))
dateTime.assign(year, month, day, hour, minute, second, millis, micros);
else
throw SyntaxException("date/time component out of range");
timeZoneDifferential = tzd;
}
DateTime DateTimeParser::parse(const std::string& fmt, const std::string& str, int& timeZoneDifferential)
{
DateTime result;
parse(fmt, str, result, timeZoneDifferential);
return result;
}
bool DateTimeParser::tryParse(const std::string& fmt, const std::string& str, DateTime& dateTime, int& timeZoneDifferential)
{
try
{
parse(fmt, str, dateTime, timeZoneDifferential);
}
catch (Exception&)
{
return false;
}
return true;
}
void DateTimeParser::parse(const std::string& str, DateTime& dateTime, int& timeZoneDifferential)
{
if (!tryParse(str, dateTime, timeZoneDifferential))
throw SyntaxException("Unsupported or invalid date/time format");
}
DateTime DateTimeParser::parse(const std::string& str, int& timeZoneDifferential)
{
DateTime result;
if (tryParse(str, result, timeZoneDifferential))
return result;
else
throw SyntaxException("Unsupported or invalid date/time format");
}
bool DateTimeParser::tryParse(const std::string& str, DateTime& dateTime, int& timeZoneDifferential)
{
if (str.length() < 4) return false;
if (str[3] == ',')
return tryParse("%w, %e %b %r %H:%M:%S %Z", str, dateTime, timeZoneDifferential);
else if (str[3] == ' ')
return tryParse(DateTimeFormat::ASCTIME_FORMAT, str, dateTime, timeZoneDifferential);
else if (str.find(',') < 10)
return tryParse("%W, %e %b %r %H:%M:%S %Z", str, dateTime, timeZoneDifferential);
else if (Ascii::isDigit(str[0]))
{
if (str.find(' ') != std::string::npos || str.length() == 10)
return tryParse(DateTimeFormat::SORTABLE_FORMAT, str, dateTime, timeZoneDifferential);
else if (str.find('.') != std::string::npos || str.find(',') != std::string::npos)
return tryParse(DateTimeFormat::ISO8601_FRAC_FORMAT, str, dateTime, timeZoneDifferential);
else
return tryParse(DateTimeFormat::ISO8601_FORMAT, str, dateTime, timeZoneDifferential);
}
else return false;
}
int DateTimeParser::parseTZD(std::string::const_iterator& it, const std::string::const_iterator& end)
{
struct Zone
{
const char* designator;
int timeZoneDifferential;
};
static Zone zones[] =
{
{"Z", 0},
{"UT", 0},
{"GMT", 0},
{"BST", 1*3600},
{"IST", 1*3600},
{"WET", 0},
{"WEST", 1*3600},
{"CET", 1*3600},
{"CEST", 2*3600},
{"EET", 2*3600},
{"EEST", 3*3600},
{"MSK", 3*3600},
{"MSD", 4*3600},
{"NST", -3*3600-1800},
{"NDT", -2*3600-1800},
{"AST", -4*3600},
{"ADT", -3*3600},
{"EST", -5*3600},
{"EDT", -4*3600},
{"CST", -6*3600},
{"CDT", -5*3600},
{"MST", -7*3600},
{"MDT", -6*3600},
{"PST", -8*3600},
{"PDT", -7*3600},
{"AKST", -9*3600},
{"AKDT", -8*3600},
{"HST", -10*3600},
{"AEST", 10*3600},
{"AEDT", 11*3600},
{"ACST", 9*3600+1800},
{"ACDT", 10*3600+1800},
{"AWST", 8*3600},
{"AWDT", 9*3600}
};
int tzd = 0;
while (it != end && Ascii::isSpace(*it)) ++it;
if (it != end)
{
if (Ascii::isAlpha(*it))
{
std::string designator;
designator += *it++;
if (it != end && Ascii::isAlpha(*it)) designator += *it++;
if (it != end && Ascii::isAlpha(*it)) designator += *it++;
if (it != end && Ascii::isAlpha(*it)) designator += *it++;
for (unsigned i = 0; i < sizeof(zones)/sizeof(Zone); ++i)
{
if (designator == zones[i].designator)
{
tzd = zones[i].timeZoneDifferential;
break;
}
}
}
if (it != end && (*it == '+' || *it == '-'))
{
int sign = *it == '+' ? 1 : -1;
++it;
int hours = 0;
PARSE_NUMBER_N(hours, 2);
if (it != end && *it == ':') ++it;
int minutes = 0;
PARSE_NUMBER_N(minutes, 2);
tzd += sign*(hours*3600 + minutes*60);
}
}
return tzd;
}
int DateTimeParser::parseMonth(std::string::const_iterator& it, const std::string::const_iterator& end)
{
std::string month;
while (it != end && (Ascii::isSpace(*it) || Ascii::isPunct(*it))) ++it;
bool isFirst = true;
while (it != end && Ascii::isAlpha(*it))
{
char ch = (*it++);
if (isFirst)
{
month += static_cast<char>(Ascii::toUpper(ch));
isFirst = false;
}
else month += static_cast<char>(Ascii::toLower(ch));
}
if (month.length() < 3) throw SyntaxException("Month name must be at least three characters long", month);
for (int i = 0; i < 12; ++i)
{
if (DateTimeFormat::MONTH_NAMES[i].find(month) == 0)
return i + 1;
}
throw SyntaxException("Not a valid month name", month);
}
int DateTimeParser::parseDayOfWeek(std::string::const_iterator& it, const std::string::const_iterator& end)
{
std::string dow;
while (it != end && (Ascii::isSpace(*it) || Ascii::isPunct(*it))) ++it;
bool isFirst = true;
while (it != end && Ascii::isAlpha(*it))
{
char ch = (*it++);
if (isFirst)
{
dow += static_cast<char>(Ascii::toUpper(ch));
isFirst = false;
}
else dow += static_cast<char>(Ascii::toLower(ch));
}
if (dow.length() < 3) throw SyntaxException("Weekday name must be at least three characters long", dow);
for (int i = 0; i < 7; ++i)
{
if (DateTimeFormat::WEEKDAY_NAMES[i].find(dow) == 0)
return i;
}
throw SyntaxException("Not a valid weekday name", dow);
}
int DateTimeParser::parseAMPM(std::string::const_iterator& it, const std::string::const_iterator& end, int hour)
{
std::string ampm;
while (it != end && (Ascii::isSpace(*it) || Ascii::isPunct(*it))) ++it;
while (it != end && Ascii::isAlpha(*it))
{
char ch = (*it++);
ampm += static_cast<char>(Ascii::toUpper(ch));
}
if (ampm == "AM")
{
if (hour == 12)
return 0;
else
return hour;
}
else if (ampm == "PM")
{
if (hour < 12)
return hour + 12;
else
return hour;
}
else throw SyntaxException("Not a valid AM/PM designator", ampm);
}
} // namespace Poco
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