;;; time-date.el --- Date and time handling functions
-;; Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
+
+;; Copyright (C) 1998-2014 Free Software Foundation, Inc.
;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; Masanobu Umeda <umerin@mse.kyutech.ac.jp>
;; This file is part of GNU Emacs.
-;; GNU Emacs is free software; you can redistribute it and/or modify
+;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
-;; the Free Software Foundation; either version 2, or (at your option)
-;; any later version.
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
;; GNU Emacs 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 the
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs; see the file COPYING. If not, write to the
-;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
+;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
+;; Time values come in several formats. The oldest format is a cons
+;; cell of the form (HIGH . LOW). This format is obsolete, but still
+;; supported. The other formats are the lists (HIGH LOW), (HIGH LOW
+;; USEC), and (HIGH LOW USEC PSEC). These formats specify the time
+;; value equal to HIGH * 2^16 + LOW + USEC * 10^-6 + PSEC * 10^-12
+;; seconds, where missing components are treated as zero. HIGH can be
+;; negative, either because the value is a time difference, or because
+;; the machine supports negative time stamps that fall before the epoch.
+;; The macro `with-decoded-time-value' and the function
+;; `encode-time-value' make it easier to deal with these formats.
+;; See `time-subtract' for an example of how to use them.
+
;;; Code:
-(require 'parse-time)
+(defmacro with-decoded-time-value (varlist &rest body)
+ "Decode a time value and bind it according to VARLIST, then eval BODY.
+
+The value of the last form in BODY is returned.
+
+Each element of the list VARLIST is a list of the form
+\(HIGH-SYMBOL LOW-SYMBOL MICRO-SYMBOL [PICO-SYMBOL [TYPE-SYMBOL]] TIME-VALUE).
+The time value TIME-VALUE is decoded and the result it bound to
+the symbols HIGH-SYMBOL, LOW-SYMBOL and MICRO-SYMBOL.
+The optional PICO-SYMBOL is bound to the picoseconds part.
+
+The optional TYPE-SYMBOL is bound to the type of the time value.
+Type 0 is the cons cell (HIGH . LOW), type 1 is the list (HIGH
+LOW), type 2 is the list (HIGH LOW MICRO), and type 3 is the
+list (HIGH LOW MICRO PICO)."
+ (declare (indent 1)
+ (debug ((&rest (symbolp symbolp symbolp &or [symbolp form] form))
+ body)))
+ (if varlist
+ (let* ((elt (pop varlist))
+ (high (pop elt))
+ (low (pop elt))
+ (micro (pop elt))
+ (pico (unless (<= (length elt) 2)
+ (pop elt)))
+ (type (unless (eq (length elt) 1)
+ (pop elt)))
+ (time-value (car elt))
+ (gensym (make-symbol "time")))
+ `(let* ,(append `((,gensym ,time-value)
+ (,high (pop ,gensym))
+ ,low ,micro)
+ (when pico `(,pico))
+ (when type `(,type)))
+ (if (consp ,gensym)
+ (progn
+ (setq ,low (pop ,gensym))
+ (if ,gensym
+ (progn
+ (setq ,micro (car ,gensym))
+ ,(cond (pico
+ `(if (cdr ,gensym)
+ ,(append `(setq ,pico (cadr ,gensym))
+ (when type `(,type 3)))
+ ,(append `(setq ,pico 0)
+ (when type `(,type 2)))))
+ (type
+ `(setq type 2))))
+ ,(append `(setq ,micro 0)
+ (when pico `(,pico 0))
+ (when type `(,type 1)))))
+ ,(append `(setq ,low ,gensym ,micro 0)
+ (when pico `(,pico 0))
+ (when type `(,type 0))))
+ (with-decoded-time-value ,varlist ,@body)))
+ `(progn ,@body)))
+(defun encode-time-value (high low micro pico &optional type)
+ "Encode HIGH, LOW, MICRO, and PICO into a time value of type TYPE.
+Type 0 is the cons cell (HIGH . LOW), type 1 is the list (HIGH LOW),
+type 2 is (HIGH LOW MICRO), and type 3 is (HIGH LOW MICRO PICO).
+
+For backward compatibility, if only four arguments are given,
+it is assumed that PICO was omitted and should be treated as zero."
+ (cond
+ ((eq type 0) (cons high low))
+ ((eq type 1) (list high low))
+ ((eq type 2) (list high low micro))
+ ((eq type 3) (list high low micro pico))
+ ((null type) (encode-time-value high low micro 0 pico))))
+
+(autoload 'parse-time-string "parse-time")
(autoload 'timezone-make-date-arpa-standard "timezone")
;;;###autoload
+;; `parse-time-string' isn't sufficiently general or robust. It fails
+;; to grok some of the formats that timezone does (e.g. dodgy
+;; post-2000 stuff from some Elms) and either fails or returns bogus
+;; values. timezone-make-date-arpa-standard should help.
(defun date-to-time (date)
- "Convert DATE into time."
+ "Parse a string DATE that represents a date-time and return a time value.
+If DATE lacks timezone information, GMT is assumed."
(condition-case ()
- (apply 'encode-time
- (parse-time-string
- ;; `parse-time-string' isn't sufficiently general or
- ;; robust. It fails to grok some of the formats that
- ;; timzeone does (e.g. dodgy post-2000 stuff from some
- ;; Elms) and either fails or returns bogus values. Lars
- ;; reverted this change, but that loses non-trivially
- ;; often for me. -- fx
- (timezone-make-date-arpa-standard date)))
- (error (error "Invalid date: %s" date))))
-
-(defun time-to-seconds (time)
- "Convert TIME to a floating point number."
- (+ (* (car time) 65536.0)
- (cadr time)
- (/ (or (nth 2 time) 0) 1000000.0)))
+ (apply 'encode-time (parse-time-string date))
+ (error (condition-case ()
+ (apply 'encode-time
+ (parse-time-string
+ (timezone-make-date-arpa-standard date)))
+ (error (error "Invalid date: %s" date))))))
+
+;; Bit of a mess. Emacs has float-time since at least 21.1.
+;; This file is synced to Gnus, and XEmacs packages may have been written
+;; using time-to-seconds from the Gnus library.
+;;;###autoload(if (or (featurep 'emacs)
+;;;###autoload (and (fboundp 'float-time)
+;;;###autoload (subrp (symbol-function 'float-time))))
+;;;###autoload (defalias 'time-to-seconds 'float-time)
+;;;###autoload (autoload 'time-to-seconds "time-date"))
+
+(eval-when-compile
+ (or (featurep 'emacs)
+ (and (fboundp 'float-time)
+ (subrp (symbol-function 'float-time)))
+ (defun time-to-seconds (time)
+ "Convert time value TIME to a floating point number."
+ (with-decoded-time-value ((high low micro pico type time))
+ (+ (* 1.0 high 65536)
+ low
+ (/ (+ (* micro 1e6) pico) 1e12))))))
+;;;###autoload
(defun seconds-to-time (seconds)
- "Convert SECONDS (a floating point number) to an Emacs time structure."
- (list (floor seconds 65536)
- (floor (mod seconds 65536))
- (floor (* (- seconds (ffloor seconds)) 1000000))))
+ "Convert SECONDS (a floating point number) to a time value."
+ (let* ((usec (* 1000000 (mod seconds 1)))
+ (ps (round (* 1000000 (mod usec 1))))
+ (us (floor usec))
+ (lo (floor (mod seconds 65536)))
+ (hi (floor seconds 65536)))
+ (if (eq ps 1000000)
+ (progn
+ (setq ps 0)
+ (setq us (1+ us))
+ (if (eq us 1000000)
+ (progn
+ (setq us 0)
+ (setq lo (1+ lo))
+ (if (eq lo 65536)
+ (progn
+ (setq lo 0)
+ (setq hi (1+ hi))))))))
+ (list hi lo us ps)))
+;;;###autoload
(defun time-less-p (t1 t2)
- "Say whether time T1 is less than time T2."
- (or (< (car t1) (car t2))
- (and (= (car t1) (car t2))
- (< (nth 1 t1) (nth 1 t2)))))
+ "Return non-nil if time value T1 is earlier than time value T2."
+ (with-decoded-time-value ((high1 low1 micro1 pico1 type1 t1)
+ (high2 low2 micro2 pico2 type2 t2))
+ (or (< high1 high2)
+ (and (= high1 high2)
+ (or (< low1 low2)
+ (and (= low1 low2)
+ (or (< micro1 micro2)
+ (and (= micro1 micro2)
+ (< pico1 pico2)))))))))
+;;;###autoload
(defun days-to-time (days)
- "Convert DAYS into time."
+ "Convert DAYS into a time value."
(let* ((seconds (* 1.0 days 60 60 24))
- (rest (expt 2 16))
- (ms (condition-case nil (floor (/ seconds rest))
- (range-error (expt 2 16)))))
- (list ms (condition-case nil (round (- seconds (* ms rest)))
- (range-error (expt 2 16))))))
+ (high (condition-case nil (floor (/ seconds 65536))
+ (range-error most-positive-fixnum))))
+ (list high (condition-case nil (floor (- seconds (* 1.0 high 65536)))
+ (range-error 65535)))))
+;;;###autoload
(defun time-since (time)
- "Return the time since TIME, which is either an internal time or a date."
+ "Return the time elapsed since TIME.
+TIME should be either a time value or a date-time string."
(when (stringp time)
;; Convert date strings to internal time.
(setq time (date-to-time time)))
- (let* ((current (current-time))
- (rest (when (< (nth 1 current) (nth 1 time))
- (expt 2 16))))
- (list (- (+ (car current) (if rest -1 0)) (car time))
- (- (+ (or rest 0) (nth 1 current)) (nth 1 time)))))
-
-(defun subtract-time (t1 t2)
- "Subtract two internal times."
- (let ((borrow (< (cadr t1) (cadr t2))))
- (list (- (car t1) (car t2) (if borrow 1 0))
- (- (+ (if borrow 65536 0) (cadr t1)) (cadr t2)))))
+ (time-subtract (current-time) time))
+;;;###autoload
+(defalias 'subtract-time 'time-subtract)
+
+;;;###autoload
+(defun time-subtract (t1 t2)
+ "Subtract two time values, T1 minus T2.
+Return the difference in the format of a time value."
+ (with-decoded-time-value ((high low micro pico type t1)
+ (high2 low2 micro2 pico2 type2 t2))
+ (setq high (- high high2)
+ low (- low low2)
+ micro (- micro micro2)
+ pico (- pico pico2)
+ type (max type type2))
+ (when (< pico 0)
+ (setq micro (1- micro)
+ pico (+ pico 1000000)))
+ (when (< micro 0)
+ (setq low (1- low)
+ micro (+ micro 1000000)))
+ (when (< low 0)
+ (setq high (1- high)
+ low (+ low 65536)))
+ (encode-time-value high low micro pico type)))
+
+;;;###autoload
+(defun time-add (t1 t2)
+ "Add two time values T1 and T2. One should represent a time difference."
+ (with-decoded-time-value ((high low micro pico type t1)
+ (high2 low2 micro2 pico2 type2 t2))
+ (setq high (+ high high2)
+ low (+ low low2)
+ micro (+ micro micro2)
+ pico (+ pico pico2)
+ type (max type type2))
+ (when (>= pico 1000000)
+ (setq micro (1+ micro)
+ pico (- pico 1000000)))
+ (when (>= micro 1000000)
+ (setq low (1+ low)
+ micro (- micro 1000000)))
+ (when (>= low 65536)
+ (setq high (1+ high)
+ low (- low 65536)))
+ (encode-time-value high low micro pico type)))
+
+;;;###autoload
(defun date-to-day (date)
- "Return the number of days between year 1 and DATE."
+ "Return the number of days between year 1 and DATE.
+DATE should be a date-time string."
(time-to-days (date-to-time date)))
+;;;###autoload
(defun days-between (date1 date2)
- "Return the number of days between DATE1 and DATE2."
+ "Return the number of days between DATE1 and DATE2.
+DATE1 and DATE2 should be date-time strings."
(- (date-to-day date1) (date-to-day date2)))
+;;;###autoload
(defun date-leap-year-p (year)
"Return t if YEAR is a leap year."
(or (and (zerop (% year 4))
(not (zerop (% year 100))))
(zerop (% year 400))))
+;;;###autoload
(defun time-to-day-in-year (time)
- "Return the day number within the year of the date month/day/year."
+ "Return the day number within the year corresponding to TIME."
(let* ((tim (decode-time time))
(month (nth 4 tim))
(day (nth 3 tim))
(setq day-of-year (1+ day-of-year))))
day-of-year))
+;;;###autoload
(defun time-to-days (time)
"The number of days between the Gregorian date 0001-12-31bce and TIME.
+TIME should be a time value.
The Gregorian date Sunday, December 31, 1bce is imaginary."
(let* ((tim (decode-time time))
- (month (nth 4 tim))
- (day (nth 3 tim))
(year (nth 5 tim)))
(+ (time-to-day-in-year time) ; Days this year
(* 365 (1- year)) ; + Days in prior years
(- (/ (1- year) 100)) ; - century years
(/ (1- year) 400)))) ; + Gregorian leap years
+(defun time-to-number-of-days (time)
+ "Return the number of days represented by TIME.
+Returns a floating point number."
+ (/ (funcall (eval-when-compile
+ (if (or (featurep 'emacs)
+ (and (fboundp 'float-time)
+ (subrp (symbol-function 'float-time))))
+ 'float-time
+ 'time-to-seconds)) time) (* 60 60 24)))
+
;;;###autoload
(defun safe-date-to-time (date)
- "Parse DATE and return a time structure.
-If DATE is malformed, a zero time will be returned."
+ "Parse a string DATE that represents a date-time and return a time value.
+If DATE is malformed, return a time value of zeros."
(condition-case ()
(date-to-time date)
(error '(0 0))))
+\f
+;;;###autoload
+(defun format-seconds (string seconds)
+ "Use format control STRING to format the number SECONDS.
+The valid format specifiers are:
+%y is the number of (365-day) years.
+%d is the number of days.
+%h is the number of hours.
+%m is the number of minutes.
+%s is the number of seconds.
+%z is a non-printing control flag (see below).
+%% is a literal \"%\".
+
+Upper-case specifiers are followed by the unit-name (e.g. \"years\").
+Lower-case specifiers return only the unit.
+
+\"%\" may be followed by a number specifying a width, with an
+optional leading \".\" for zero-padding. For example, \"%.3Y\" will
+return something of the form \"001 year\".
+
+The \"%z\" specifier does not print anything. When it is used, specifiers
+must be given in order of decreasing size. To the left of \"%z\", nothing
+is output until the first non-zero unit is encountered.
+
+This function does not work for SECONDS greater than `most-positive-fixnum'."
+ (let ((start 0)
+ (units '(("y" "year" 31536000)
+ ("d" "day" 86400)
+ ("h" "hour" 3600)
+ ("m" "minute" 60)
+ ("s" "second" 1)
+ ("z")))
+ (case-fold-search t)
+ spec match usedunits zeroflag larger prev name unit num zeropos)
+ (while (string-match "%\\.?[0-9]*\\(.\\)" string start)
+ (setq start (match-end 0)
+ spec (match-string 1 string))
+ (unless (string-equal spec "%")
+ (or (setq match (assoc (downcase spec) units))
+ (error "Bad format specifier: `%s'" spec))
+ (if (assoc (downcase spec) usedunits)
+ (error "Multiple instances of specifier: `%s'" spec))
+ (if (string-equal (car match) "z")
+ (setq zeroflag t)
+ (unless larger
+ (setq unit (nth 2 match)
+ larger (and prev (> unit prev))
+ prev unit)))
+ (push match usedunits)))
+ (and zeroflag larger
+ (error "Units are not in decreasing order of size"))
+ (dolist (u units)
+ (setq spec (car u)
+ name (cadr u)
+ unit (nth 2 u))
+ (when (string-match (format "%%\\(\\.?[0-9]+\\)?\\(%s\\)" spec) string)
+ (if (string-equal spec "z") ; must be last in units
+ (setq string
+ (replace-regexp-in-string
+ "%z" ""
+ (substring string (min (or zeropos (match-end 0))
+ (match-beginning 0)))))
+ ;; Cf article-make-date-line in gnus-art.
+ (setq num (floor seconds unit)
+ seconds (- seconds (* num unit)))
+ ;; Start position of the first non-zero unit.
+ (or zeropos
+ (setq zeropos (unless (zerop num) (match-beginning 0))))
+ (setq string
+ (replace-match
+ (format (concat "%" (match-string 1 string) "d%s") num
+ (if (string-equal (match-string 2 string) spec)
+ "" ; lower-case, no unit-name
+ (format " %s%s" name
+ (if (= num 1) "" "s"))))
+ t t string))))))
+ (replace-regexp-in-string "%%" "%" string))
+
+(defvar seconds-to-string
+ (list (list 1 "ms" 0.001)
+ (list 100 "s" 1)
+ (list (* 60 100) "m" 60.0)
+ (list (* 3600 30) "h" 3600.0)
+ (list (* 3600 24 400) "d" (* 3600.0 24.0))
+ (list nil "y" (* 365.25 24 3600)))
+ "Formatting used by the function `seconds-to-string'.")
+;;;###autoload
+(defun seconds-to-string (delay)
+ "Convert the time interval in seconds to a short string."
+ (cond ((> 0 delay) (concat "-" (seconds-to-string (- delay))))
+ ((= 0 delay) "0s")
+ (t (let ((sts seconds-to-string) here)
+ (while (and (car (setq here (pop sts)))
+ (<= (car here) delay)))
+ (concat (format "%.2f" (/ delay (car (cddr here)))) (cadr here))))))
+
(provide 'time-date)
;;; time-date.el ends here
projects / gnus / blobdiff