+++ /dev/null
-;;; parse-time.el --- Parsing time strings
-
-;; Copyright (C) 1996, 2000 by 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., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, 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
-;; valuse 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)
-
-;;; parse-time.el ends here
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