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;;; parse-time.el --- Parsing time strings
;; Copyright (C) 1996, 2000, 2001, 2002, 2003, 2004, 2005, 2006
;; Free Software Foundation, Inc.
;; Author: Erik Naggum <erik@naggum.no>
;; Keywords: util
;; This file is part of GNU Emacs.
;; 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.
;; 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
;; 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., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;; With the introduction of the `encode-time', `decode-time', and
;; `format-time-string' functions, dealing with time became simpler in
;; Emacs. However, parsing time strings is still largely a matter of
;; heuristics and no common interface has been designed.
;; `parse-time-string' parses a time in a string and returns a list of 9
;; values, just like `decode-time', where unspecified elements in the
;; string are returned as nil. `encode-time' may be applied on these
;; values to obtain an internal time value.
;;; Code:
(eval-when-compile (require 'cl)) ;and ah ain't kiddin' 'bout it
(defvar parse-time-syntax (make-vector 256 nil))
(defvar parse-time-digits (make-vector 256 nil))
;; Byte-compiler warnings
(defvar elt)
(defvar val)
(unless (aref parse-time-digits ?0)
(loop for i from ?0 to ?9
do (aset parse-time-digits i (- i ?0))))
(unless (aref parse-time-syntax ?0)
(loop for i from ?0 to ?9
do (aset parse-time-syntax i ?0))
(loop for i from ?A to ?Z
do (aset parse-time-syntax i ?A))
(loop for i from ?a to ?z
do (aset parse-time-syntax i ?a))
(aset parse-time-syntax ?+ 1)
(aset parse-time-syntax ?- -1)
(aset 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) ;skip invalid characters
(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) ;scan valid characters
(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) (100 4038))
((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 0)
,#'(lambda () (and (stringp elt) (= (length elt) 5) (= (aref elt 2) ?:)))
[0 2] [3 5] ,#'(lambda () 0))
((2 1 0)
,#'(lambda () (and (stringp elt)
(= (length elt) 4)
(= (aref elt 1) ?:)))
[0 1] [2 4] ,#'(lambda () 0))
((2 1 0)
,#'(lambda () (and (stringp elt)
(= (length elt) 7)
(= (aref elt 1) ?:)))
[0 1] [2 4] [5 7])
((5) (50 110) ,#'(lambda () (+ 1900 elt)))
((5) (0 49) ,#'(lambda () (+ 2000 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))
(temp (parse-time-tokenize (downcase 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))
(when (and (not (nth (car slots) time)) ;not already set
(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)))))
(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)
;;; arch-tag: 07066094-45a8-4c68-b307-86195e2c1103
;;; parse-time.el ends here
|
