Xapian::DateRangeProcessor Class Reference

Handle a date range. More...

#include <queryparser.h>

Inheritance diagram for Xapian::DateRangeProcessor:

Public Member Functions
	DateRangeProcessor (Xapian::valueno slot_, unsigned flags_=0, int epoch_year_=1970)
	Constructor.
	DateRangeProcessor (Xapian::valueno slot_, const std::string &str_, unsigned flags_=0, int epoch_year_=1970)
	Constructor.
Xapian::Query	operator() (const std::string &begin, const std::string &end)
	Check for a valid date range.
Public Member Functions inherited from Xapian::RangeProcessor
	RangeProcessor ()
	Default constructor.
	RangeProcessor (Xapian::valueno slot_, const std::string &str_=std::string(), unsigned flags_=0)
	Constructor.
virtual	~RangeProcessor ()
	Destructor.
Xapian::Query	check_range (const std::string &b, const std::string &e)
	Check prefix/suffix on range.
RangeProcessor *	release ()
	Start reference counting this object.
const RangeProcessor *	release () const
	Start reference counting this object.

Additional Inherited Members
Protected Attributes inherited from Xapian::RangeProcessor
Xapian::valueno	slot
	The value slot to process.
std::string	str
	The prefix (or suffix with RP_SUFFIX) string to look for.
unsigned	flags
	Flags.

Detailed Description

Handle a date range.

Begin and end must be dates in a recognised format.

Constructor & Destructor Documentation

DateRangeProcessor() [1/2]

Xapian::DateRangeProcessor::DateRangeProcessor ( Xapian::valueno slot_, unsigned flags_ = 0, int epoch_year_ = 1970 )

inlineexplicit

Constructor.

Parameters

slot_	The value number to return from operator().
flags_	Zero or more of the following flags, combined with bitwise-or: Xapian::RP_DATE_PREFER_MDY - interpret ambiguous dates as month/day/year rather than day/month/year.
epoch_year_	Year to use as the epoch for dates with 2 digit years (default: 1970, so 1/1/69 is 2069 while 1/1/70 is 1970).

DateRangeProcessor() [2/2]

Xapian::DateRangeProcessor::DateRangeProcessor ( Xapian::valueno slot_, const std::string & str_, unsigned flags_ = 0, int epoch_year_ = 1970 )

inline

Constructor.

Parameters

slot_	The value slot number to query.
str_	A prefix or suffix string to look for to recognise values as belonging to this date range (flags_ determines whether this is a prefix or suffix).
flags_	Zero or more of the following flags, combined with bitwise-or: Xapian::RP_SUFFIX - require str_ as a suffix instead of a prefix. Xapian::RP_REPEATED - optionally allow str_ on both ends of the range - e.g. $1..$10 or 5m..50m. By default a prefix is only checked for on the start (e.g. date:1/1/1980..31/12/1989), and a suffix only on the end (e.g. 2..12kg). Xapian::RP_DATE_PREFER_MDY - interpret ambiguous dates as month/day/year rather than day/month/year.
epoch_year_	Year to use as the epoch for dates with 2 digit years (default: 1970, so 1/1/69 is 2069 while 1/1/70 is 1970).

The string supplied in str_ is used by operator() to decide whether the pair of strings supplied to it constitute a valid range. If prefix_ is true, the first value in a range must begin with str_ (and the second value may optionally begin with str_); if prefix_ is false, the second value in a range must end with str_ (and the first value may optionally end with str_).

If str_ is empty then no prefix or suffix is checked for (and Xapian::RP_SUFFIX and Xapian::RP_REPEATED are irrelevant) - anything which looks like a date range will be processed.

Member Function Documentation

operator()()

Xapian::Query Xapian::DateRangeProcessor::operator() ( const std::string & begin, const std::string & end )

virtual

Check for a valid date range.

Parameters

begin	The start of the range as specified in the query string by the user.
end	The end of the range as specified in the query string by the user.

If a prefix or suffix was specified at construction time, that must be present on begin and/or end (taking Xapian::RP_SUFFIX and Xapian::RP_REPEATED into account).

Then if the range looks like a date range, the dates are converted to the format YYYYMMDD and combined into a value range query.

Most numeric date formats are recognised:

• YYYYMMDD - e.g. 20251225..20260214
• YYYY-MM-DD (ISO) - e.g. 2025-12-25..2026-02-14
• month/day/year (US) - e.g. 12/25/2025..2/14/2026
• day/month/year (much of the world) - e.g. 25/12/2025..14/2/2026

The delimiter can be -, / or . for any of the delimited formats, but must be the same within a single date.

Some dates are unfortunately ambiguous and could be in either of the last two formats - for example 2/3/2025 could be March 2nd or February 3rd. The range start is assumed to be before the range end which can resolve some ambiguous cases, but otherwise day/month/year is assumed unless flag Xapian::RP_DATE_PREFER_MDY was specified.

Two digit years can be used with the last two formats - constructor parameter epoch_year_ determines how these are interpreted.

Reimplemented from Xapian::RangeProcessor.

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The documentation for this class was generated from the following file:

• xapian/queryparser.h