Version 0.2, 2005-12-05, http://www.neilvandyke.org/rfc3339-scm/
by
Neil W. Van Dyke
<neil@neilvandyke.org>
Copyright © 2005 Neil W. Van Dyke. This program is Free
Software; you can redistribute it and/or modify it under the terms of the
GNU Lesser General Public License as published by the Free Software
Foundation; either version 2.1 of the License, or (at your option) any
later version. This program is distributed in the hope that it will be
useful, but without any warranty; without even the implied warranty of
merchantability or fitness for a particular purpose. See
<http://www.gnu.org/copyleft/lesser.html> for details. For
other license options and consulting, contact the author.
The rfc3339.scm package implements parsing, formatting, and simple
validation of RFC3339
date and time format, which is a subset of
ISO 8601, intended for use in Internet protocols.
Note that full Scheme support of ISO 8601 is a very different project of
the author, and not at all the intention of rfc3339.scm.
rfc3339.scm requires R5RS, SRFI-6, SRFI-9, and two particular
regular expression functions. Note that the regular expression functions
in Pregexp 1e9 will not work, but are expected to work in subsequent versions of
Pregexp. Thus far, rfc3339.scm has only been tested under PLT
MzScheme.
rfc3339-record is an abstract data type for the information in an
RFC3339 format time and date. (“rfc3339-string” is used in
identifiers to denote the RFC3339 format as a Scheme string.)
Construct an
rfc3339-recordwith the given field values. Each of year, month, mday, hour, minute, and second is#for a nonnegative integer. secfrac is#for a real number that is greater than or equal to 0.0 and less than 1.0. offsetmin is#for a nonnegative integer. Note that offsetmin represents both the hour and minute components of an RFC3339 string.
Get the respective field value of
rfc3339-recordrec.
Set the respective field value of
rfc3339-recordrec to val.
Yields a list of the
rfc3339-recordrec fields, corresponding to the arguments of themake-rfc3339-recordprocedure.(rfc3339-record->list (make-rfc3339-record 1985 4 12 23 20 50 0.52 0)) => (1985 4 12 23 20 50 0.52 0)
The parsing procedures are for constructing a rfc3339-records,
lists, and vectors from RFC3339 strings. The underlying parser can also
apply a user-supplied closure directly.
Parses RFC3339 string str and applies procedure constructor with the parsed values. The arguments of constructor are the same as those of
make-rfc3339-record.
Yields a list or vector (respectively) from the parsed values of RFC3339 string str. The list and vector elements correspond to the arguments of
make-rfc3339-record.(rfc3339-string->list "1985-04-12T23:20:69.52+5:0") => (1985 4 12 23 20 69 0.52 300) (rfc3339-string->vector "1985-04-12T23:20:69.52+5:0") => #(1985 4 12 23 20 69 0.52 300)
An RFC3339 string format can be obtained from an rfc3339-record.
Write an RFC3339 string format of
rfc3339-recordrec to output port port.
Yield an RFC3339 string format of
rfc3339-recordrec as a Scheme string.
A few procedures are provided for validating rfc3339-records.
Check the respective component of
rfc3339-recordrec for completeness and correctness, yielding#fiff no problems were detected. If explain? is true, then true values of these procedures are lists that “explain” the error detected. For example:(check-rfc3339-record-date (string->rfc3339-record "1999-02") #t) => (missing mday) (check-rfc3339-record-date (string->rfc3339-record "1999-02-29") #t) => (invalid mday 29 (and (integer? mday) (<= 1 mday (month-days year month)))) (check-rfc3339-record-date (string->rfc3339-record "2000-02-29") #t) => #fLeap years are calculated correctly. Leap seconds (61st seconds in minutes) are tolerated in any date and time.
Checks all three components. See
check-rfc3339-record-dateet al.
Yields a true value iff
check-rfc3339-record-fullyields a false value.
rfc3339.scm has no dependency on SRFI-19, but a procedure is
provided for constructing a SRFI-19 date.
Contruct a SRFI-19
datefrom an RFC3339 string, where str is the string, and make-date is the SRFI-19dateconstructor. Applications using SRFI-19 may wish to define anrfc3339-string->dateprocedure:(define (rfc3339-string->date str) (rfc3339-string->srfi19-date/constructor str make-date))
The rfc3339.scm test suite can be enabled by editing the source code
file and loading Testeez.