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Annotation of OpenXM_contrib/pari-2.2/emacs/with-syntax.el, Revision 1.1.1.1

1.1       noro        1: ;; This file is to be used with pari.el  and with pari-translator.el
                      2: ;; where further explanations may be found. See also the file pariemacs.txt.
                      3:
                      4: ;; Created November 22 1998 by Olivier Ramare (ramare@gat.univ-lille1.fr)
                      5:
                      6: ;; Description:
                      7: ;; A lisp file used in gp-script-mode to use the syntax 'with'.
                      8: ;; See the function 'translate-with for more details.
                      9: ;; To use it in an edited gp-program, introduce the following
                     10: ;; lines in this program:
                     11: ;; /*@
                     12: ;; (load-file "with-syntax.el")
                     13: ;; (setq gp-input-filter-hook (list 'translate))
                     14: ;; */
                     15:
                     16: ;; You should load some general functions for translating,
                     17: ;; and the name below may be different on your system:
                     18: (require 'pari-translator
                     19:   (concat gp-gphelp-dir "pari-translator.el"))
                     20:
                     21: ;; Here is the master function:
                     22: (defun translate nil
                     23:   (gp-translate-on-other-file)
                     24:
                     25:   ;; Now starts the translation:
                     26:   (translate-with)
                     27:   )
                     28:
                     29:
                     30: ;;---------------------
                     31: ;; Translation of with
                     32: ;;---------------------
                     33:
                     34: (defvar translate-with-number 0
                     35:  "The next variable of a `with' function will be replaced by the
                     36: identifier whose name is the concatenation of \"with\" with this
                     37: number.")
                     38:
                     39: (defun translate-with nil
                     40:   "Understand the syntax \"with(foo,to_do)\" in a gp-program, where foo
                     41: is an expression evaluating to a vector, as follows: any subsequent
                     42: dot `.' not preceded by a character of the set []a-zA-Z0-9_] is
                     43: replaced by this evaluation. An auxiliary variable with# is used where
                     44: # is an integer given by the variable 'translate-with-number.
                     45: Imbricated with are allowed and the innermost one has priority. "
                     46:
                     47:   (goto-char (point-max))
                     48:   (while (re-search-backward "\\([^a-zA-Z_0-9]\\|\\`\\)with(" nil t)
                     49:          (goto-char (match-end 0))
                     50:          (let ((father (buffer-substring (point)
                     51:                                          (gp-looking-at-rat-exp)))
                     52:                (replacement
                     53:                  (concat "with" (number-to-string translate-with-number)))
                     54:                (p-end (save-excursion
                     55:                        (forward-char -1) (forward-sexp)
                     56:                        (- (point) 1))))
                     57:               (setq translate-with-number (+ 1 translate-with-number))
                     58:               ;; Erase the command:
                     59:               (forward-char -5)
                     60:               (delete-char (+ 6 (length father)))
                     61:               ;; Insert new variable:
                     62:               (insert (concat replacement "=" father ";\n"))
                     63:               (setq p-end (- p-end
                     64:                              (- (length replacement) 3)))
                     65:               ;; Erase last ):
                     66:               (save-excursion (goto-char p-end) (delete-char 1))
                     67:               ;; Replace proper `.' by new variable:
                     68:               (while (re-search-forward "[^]a-zA-Z0-9_]\\." (- p-end 1) t)
                     69:                      (forward-char -1) (delete-char 1)
                     70:                      (insert replacement)
                     71:                      (setq p-end (+ p-end (- (length replacement) 1)))
                     72:                      (forward-char 1))))
                     73:   ;; Set the counter back to 0 to avoid creating to many
                     74:   ;; variables:
                     75:   (setq translate-with-number 0))
                     76:
                     77:
                     78: ;; with-syntax.el ends here