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119 lines
5.5 KiB
C++
119 lines
5.5 KiB
C++
//
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// DateTimeParser.h
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//
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// $Id: //poco/1.4/Foundation/include/Poco/DateTimeParser.h#1 $
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//
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// Library: Foundation
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// Package: DateTime
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// Module: DateTimeParser
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//
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// Definition of the DateTimeParser class.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Foundation_DateTimeParser_INCLUDED
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#define Foundation_DateTimeParser_INCLUDED
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#include "Poco/Foundation.h"
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#include "Poco/DateTime.h"
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namespace Poco {
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class Foundation_API DateTimeParser
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/// This class provides a method for parsing dates and times
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/// from strings. All parsing methods do their best to
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/// parse a meaningful result, even from malformed input
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/// strings.
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///
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/// The returned DateTime will always contain a time in the same
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/// timezone as the time in the string. Call DateTime::makeUTC()
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/// with the timeZoneDifferential returned by parse() to convert
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/// the DateTime to UTC.
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///
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/// Note: When parsing a time in 12-hour (AM/PM) format, the hour
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/// (%h) must be parsed before the AM/PM designator (%a, %A),
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/// otherwise the AM/PM designator will be ignored.
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///
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/// See the DateTimeFormatter class for a list of supported format specifiers.
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/// In addition to the format specifiers supported by DateTimeFormatter, an
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/// additional specifier is supported: %r will parse a year given by either
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/// two or four digits. Years 69-00 are interpreted in the 20th century
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/// (1969-2000), years 01-68 in the 21th century (2001-2068).
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///
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/// Note that in the current implementation all characters other than format specifiers in
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/// the format string are ignored/not matched against the date/time string. This may
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/// lead to non-error results even with nonsense input strings.
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/// This may change in a future version to a more strict behavior.
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/// If more strict format validation of date/time strings is required, a regular
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/// expression could be used for initial validation, before passing the string
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/// to DateTimeParser.
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{
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public:
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static void parse(const std::string& fmt, const std::string& str, DateTime& dateTime, int& timeZoneDifferential);
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/// Parses a date and time in the given format from the given string.
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/// Throws a SyntaxException if the string cannot be successfully parsed.
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/// Please see DateTimeFormatter::format() for a description of the format string.
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/// Class DateTimeFormat defines format strings for various standard date/time formats.
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static DateTime parse(const std::string& fmt, const std::string& str, int& timeZoneDifferential);
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/// Parses a date and time in the given format from the given string.
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/// Throws a SyntaxException if the string cannot be successfully parsed.
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/// Please see DateTimeFormatter::format() for a description of the format string.
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/// Class DateTimeFormat defines format strings for various standard date/time formats.
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static bool tryParse(const std::string& fmt, const std::string& str, DateTime& dateTime, int& timeZoneDifferential);
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/// Parses a date and time in the given format from the given string.
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/// Returns true if the string has been successfully parsed, false otherwise.
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/// Please see DateTimeFormatter::format() for a description of the format string.
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/// Class DateTimeFormat defines format strings for various standard date/time formats.
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static void parse(const std::string& str, DateTime& dateTime, int& timeZoneDifferential);
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/// Parses a date and time from the given dateTime string. Before parsing, the method
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/// examines the dateTime string for a known date/time format.
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/// Throws a SyntaxException if the string cannot be successfully parsed.
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/// Please see DateTimeFormatter::format() for a description of the format string.
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/// Class DateTimeFormat defines format strings for various standard date/time formats.
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static DateTime parse(const std::string& str, int& timeZoneDifferential);
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/// Parses a date and time from the given dateTime string. Before parsing, the method
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/// examines the dateTime string for a known date/time format.
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/// Please see DateTimeFormatter::format() for a description of the format string.
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/// Class DateTimeFormat defines format strings for various standard date/time formats.
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static bool tryParse(const std::string& str, DateTime& dateTime, int& timeZoneDifferential);
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/// Parses a date and time from the given dateTime string. Before parsing, the method
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/// examines the dateTime string for a known date/time format.
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/// Please see DateTimeFormatter::format() for a description of the format string.
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/// Class DateTimeFormat defines format strings for various standard date/time formats.
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static int parseMonth(std::string::const_iterator& it, const std::string::const_iterator& end);
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/// Tries to interpret the given range as a month name. The range must be at least
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/// three characters long.
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/// Returns the month number (1 .. 12) if the month name is valid. Otherwise throws
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/// a SyntaxException.
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static int parseDayOfWeek(std::string::const_iterator& it, const std::string::const_iterator& end);
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/// Tries to interpret the given range as a weekday name. The range must be at least
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/// three characters long.
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/// Returns the weekday number (0 .. 6, where 0 = Sunday, 1 = Monday, etc.) if the
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/// weekday name is valid. Otherwise throws a SyntaxException.
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protected:
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static int parseTZD(std::string::const_iterator& it, const std::string::const_iterator& end);
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static int parseAMPM(std::string::const_iterator& it, const std::string::const_iterator& end, int hour);
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};
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} // namespace Poco
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#endif // Foundation_DateTimeParser_INCLUDED
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