(eval-when-compile (require 'cl))
(put 'parse-time-syntax 'char-table-extra-slots 0)
(defvar parse-time-syntax (make-char-table 'parse-time-syntax))
(defvar parse-time-digits (make-char-table 'parse-time-syntax))
(defvar elt)
(defvar val)
(unless (aref parse-time-digits ?0)
(loop for i from ?0 to ?9
do (set-char-table-range parse-time-digits i (- i ?0))))
(unless (aref parse-time-syntax ?0)
(loop for i from ?0 to ?9
do (set-char-table-range parse-time-syntax i ?0))
(loop for i from ?A to ?Z
do (set-char-table-range parse-time-syntax i ?A))
(loop for i from ?a to ?z
do (set-char-table-range parse-time-syntax i ?a))
(set-char-table-range parse-time-syntax ?+ 1)
(set-char-table-range parse-time-syntax ?- -1)
(set-char-table-range parse-time-syntax ?: ?d)
)
(defsubst digit-char-p (char)
(aref parse-time-digits char))
(defsubst parse-time-string-chars (char)
(aref parse-time-syntax char))
(put 'parse-error 'error-conditions '(parse-error error))
(put 'parse-error 'error-message "Parsing error")
(defsubst parse-integer (string &optional start end)
"[CL] Parse and return the integer in STRING, or nil if none."
(let ((integer 0)
(digit 0)
(index (or start 0))
(end (or end (length string))))
(when (< index end)
(let ((sign (aref string index)))
(if (or (eq sign ?+) (eq sign ?-))
(setq sign (parse-time-string-chars sign)
index (1+ index))
(setq sign 1))
(while (and (< index end)
(setq digit (digit-char-p (aref string index))))
(setq integer (+ (* integer 10) digit)
index (1+ index)))
(if (/= index end)
(signal 'parse-error `("not an integer" ,(substring string (or start 0) end)))
(* sign integer))))))
(defun parse-time-tokenize (string)
"Tokenize STRING into substrings."
(let ((start nil)
(end (length string))
(all-digits nil)
(list ())
(index 0)
(c nil))
(while (< index end)
(while (and (< index end) (not (setq c (parse-time-string-chars (aref string index)))))
(incf index))
(setq start index all-digits (eq c ?0))
(while (and (< (incf index) end) (setq c (parse-time-string-chars (aref string index))))
(setq all-digits (and all-digits (eq c ?0))))
(if (<= index end)
(push (if all-digits (parse-integer string start index)
(substring string start index))
list)))
(nreverse list)))
(defvar parse-time-months '(("Jan" . 1) ("Feb" . 2) ("Mar" . 3)
("Apr" . 4) ("May" . 5) ("Jun" . 6)
("Jul" . 7) ("Aug" . 8) ("Sep" . 9)
("Oct" . 10) ("Nov" . 11) ("Dec" . 12)))
(defvar parse-time-weekdays '(("Sun" . 0) ("Mon" . 1) ("Tue" . 2)
("Wed" . 3) ("Thu" . 4) ("Fri" . 5) ("Sat" . 6)))
(defvar parse-time-zoneinfo `(("Z" 0) ("UT" 0) ("GMT" 0)
("PST" ,(* -8 3600)) ("PDT" ,(* -7 3600) t)
("MST" ,(* -7 3600)) ("MDT" ,(* -6 3600) t)
("CST" ,(* -6 3600)) ("CDT" ,(* -5 3600) t)
("EST" ,(* -5 3600)) ("EDT" ,(* -4 3600) t))
"(zoneinfo seconds-off daylight-savings-time-p)")
(defvar parse-time-rules
`(((6) parse-time-weekdays)
((3) (1 31))
((4) parse-time-months)
((5) (1970 2038))
((2 1 0)
,#'(lambda () (and (stringp elt)
(= (length elt) 8)
(= (aref elt 2) ?:)
(= (aref elt 5) ?:)))
[0 2] [3 5] [6 8])
((8 7) parse-time-zoneinfo
,#'(lambda () (car val))
,#'(lambda () (cadr val)))
((8)
,#'(lambda ()
(and (stringp elt)
(= 5 (length elt))
(or (= (aref elt 0) ?+) (= (aref elt 0) ?-))))
,#'(lambda () (* 60 (+ (parse-integer elt 3 5)
(* 60 (parse-integer elt 1 3)))
(if (= (aref elt 0) ?-) -1 1))))
((5 4 3)
,#'(lambda () (and (stringp elt) (= (length elt) 10) (= (aref elt 4) ?-) (= (aref elt 7) ?-)))
[0 4] [5 7] [8 10])
((2 1)
,#'(lambda () (and (stringp elt) (= (length elt) 5) (= (aref elt 2) ?:)))
[0 2] [3 5])
((5) (70 99) ,#'(lambda () (+ 1900 elt))))
"(slots predicate extractor...)")
(defun parse-time-string (string)
"Parse the time-string STRING into (SEC MIN HOUR DAY MON YEAR DOW DST TZ).
The values are identical to those of `decode-time', but any values that are
unknown are returned as nil."
(let ((time (list nil nil nil nil nil nil nil nil nil nil))
(temp (parse-time-tokenize string)))
(while temp
(let ((elt (pop temp))
(rules parse-time-rules)
(exit nil))
(while (and (not (null rules)) (not exit))
(let* ((rule (pop rules))
(slots (pop rule))
(predicate (pop rule))
(val))
(if (and (not (nth (car slots) time)) (setq val (cond ((and (consp predicate)
(not (eq (car predicate) 'lambda)))
(and (numberp elt)
(<= (car predicate) elt)
(<= elt (cadr predicate))
elt))
((symbolp predicate)
(cdr (assoc elt (symbol-value predicate))))
((funcall predicate)))))
(progn
(setq exit t)
(while slots
(let ((new-val (and rule
(let ((this (pop rule)))
(if (vectorp this)
(parse-integer elt (aref this 0) (aref this 1))
(funcall this))))))
(rplaca (nthcdr (pop slots) time) (or new-val val))))))))))
time))
(provide 'parse-time)