mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-18 13:42:02 +00:00
118 lines
5.5 KiB
C++
118 lines
5.5 KiB
C++
//
|
|
// DateTimeParser.h
|
|
//
|
|
// Library: Foundation
|
|
// Package: DateTime
|
|
// Module: DateTimeParser
|
|
//
|
|
// Definition of the DateTimeParser class.
|
|
//
|
|
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
|
|
// and Contributors.
|
|
//
|
|
// SPDX-License-Identifier: BSL-1.0
|
|
//
|
|
|
|
|
|
#ifndef Foundation_DateTimeParser_INCLUDED
|
|
#define Foundation_DateTimeParser_INCLUDED
|
|
|
|
|
|
#include "Poco/DateTime.h"
|
|
#include "Poco/Foundation.h"
|
|
|
|
|
|
namespace Poco
|
|
{
|
|
|
|
|
|
class Foundation_API DateTimeParser
|
|
/// This class provides a method for parsing dates and times
|
|
/// from strings. All parsing methods do their best to
|
|
/// parse a meaningful result, even from malformed input
|
|
/// strings.
|
|
///
|
|
/// The returned DateTime will always contain a time in the same
|
|
/// timezone as the time in the string. Call DateTime::makeUTC()
|
|
/// with the timeZoneDifferential returned by parse() to convert
|
|
/// the DateTime to UTC.
|
|
///
|
|
/// Note: When parsing a time in 12-hour (AM/PM) format, the hour
|
|
/// (%h) must be parsed before the AM/PM designator (%a, %A),
|
|
/// otherwise the AM/PM designator will be ignored.
|
|
///
|
|
/// See the DateTimeFormatter class for a list of supported format specifiers.
|
|
/// In addition to the format specifiers supported by DateTimeFormatter, an
|
|
/// additional specifier is supported: %r will parse a year given by either
|
|
/// two or four digits. Years 69-00 are interpreted in the 20th century
|
|
/// (1969-2000), years 01-68 in the 21th century (2001-2068).
|
|
///
|
|
/// Note that in the current implementation all characters other than format specifiers in
|
|
/// the format string are ignored/not matched against the date/time string. This may
|
|
/// lead to non-error results even with nonsense input strings.
|
|
/// This may change in a future version to a more strict behavior.
|
|
/// If more strict format validation of date/time strings is required, a regular
|
|
/// expression could be used for initial validation, before passing the string
|
|
/// to DateTimeParser.
|
|
{
|
|
public:
|
|
static void parse(const std::string & fmt, const std::string & str, DateTime & dateTime, int & timeZoneDifferential);
|
|
/// Parses a date and time in the given format from the given string.
|
|
/// Throws a SyntaxException if the string cannot be successfully parsed.
|
|
/// Please see DateTimeFormatter::format() for a description of the format string.
|
|
/// Class DateTimeFormat defines format strings for various standard date/time formats.
|
|
|
|
static DateTime parse(const std::string & fmt, const std::string & str, int & timeZoneDifferential);
|
|
/// Parses a date and time in the given format from the given string.
|
|
/// Throws a SyntaxException if the string cannot be successfully parsed.
|
|
/// Please see DateTimeFormatter::format() for a description of the format string.
|
|
/// Class DateTimeFormat defines format strings for various standard date/time formats.
|
|
|
|
static bool tryParse(const std::string & fmt, const std::string & str, DateTime & dateTime, int & timeZoneDifferential);
|
|
/// Parses a date and time in the given format from the given string.
|
|
/// Returns true if the string has been successfully parsed, false otherwise.
|
|
/// Please see DateTimeFormatter::format() for a description of the format string.
|
|
/// Class DateTimeFormat defines format strings for various standard date/time formats.
|
|
|
|
static void parse(const std::string & str, DateTime & dateTime, int & timeZoneDifferential);
|
|
/// Parses a date and time from the given dateTime string. Before parsing, the method
|
|
/// examines the dateTime string for a known date/time format.
|
|
/// Throws a SyntaxException if the string cannot be successfully parsed.
|
|
/// Please see DateTimeFormatter::format() for a description of the format string.
|
|
/// Class DateTimeFormat defines format strings for various standard date/time formats.
|
|
|
|
static DateTime parse(const std::string & str, int & timeZoneDifferential);
|
|
/// Parses a date and time from the given dateTime string. Before parsing, the method
|
|
/// examines the dateTime string for a known date/time format.
|
|
/// Please see DateTimeFormatter::format() for a description of the format string.
|
|
/// Class DateTimeFormat defines format strings for various standard date/time formats.
|
|
|
|
static bool tryParse(const std::string & str, DateTime & dateTime, int & timeZoneDifferential);
|
|
/// Parses a date and time from the given dateTime string. Before parsing, the method
|
|
/// examines the dateTime string for a known date/time format.
|
|
/// Please see DateTimeFormatter::format() for a description of the format string.
|
|
/// Class DateTimeFormat defines format strings for various standard date/time formats.
|
|
|
|
static int parseMonth(std::string::const_iterator & it, const std::string::const_iterator & end);
|
|
/// Tries to interpret the given range as a month name. The range must be at least
|
|
/// three characters long.
|
|
/// Returns the month number (1 .. 12) if the month name is valid. Otherwise throws
|
|
/// a SyntaxException.
|
|
|
|
static int parseDayOfWeek(std::string::const_iterator & it, const std::string::const_iterator & end);
|
|
/// Tries to interpret the given range as a weekday name. The range must be at least
|
|
/// three characters long.
|
|
/// Returns the weekday number (0 .. 6, where 0 = Synday, 1 = Monday, etc.) if the
|
|
/// weekday name is valid. Otherwise throws a SyntaxException.
|
|
|
|
protected:
|
|
static int parseTZD(std::string::const_iterator & it, const std::string::const_iterator & end);
|
|
static int parseAMPM(std::string::const_iterator & it, const std::string::const_iterator & end, int hour);
|
|
};
|
|
|
|
|
|
} // namespace Poco
|
|
|
|
|
|
#endif // Foundation_DateTimeParser_INCLUDED
|