ob-calc.el 3.27 KB
Newer Older
Carsten Dominik's avatar
Carsten Dominik committed
1 2
;;; ob-calc.el --- org-babel functions for calc code evaluation

3
;; Copyright (C) 2010  Free Software Foundation, Inc
Carsten Dominik's avatar
Carsten Dominik committed
4 5 6 7

;; Author: Eric Schulte
;; Keywords: literate programming, reproducible research
;; Homepage: http://orgmode.org
8
;; Version: 7.7
Carsten Dominik's avatar
Carsten Dominik committed
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

;; 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 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
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;; Org-Babel support for evaluating calc code

;;; Code:
(require 'ob)
(require 'calc)
32 33
(require 'calc-store)
(unless (featurep 'xemacs) (require 'calc-trail))
Carsten Dominik's avatar
Carsten Dominik committed
34 35 36 37 38 39 40 41 42 43
(eval-when-compile (require 'ob-comint))

(defvar org-babel-default-header-args:calc nil
  "Default arguments for evaluating an calc source block.")

(defun org-babel-expand-body:calc (body params)
  "Expand BODY according to PARAMS, return the expanded body." body)

(defun org-babel-execute:calc (body params)
  "Execute a block of calc code with Babel."
Carsten Dominik's avatar
Carsten Dominik committed
44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71
  (unless (get-buffer "*Calculator*")
    (save-window-excursion (calc) (calc-quit)))
  (let* ((vars (mapcar #'cdr (org-babel-get-header params :var)))
	 (var-syms (mapcar #'car vars))
	 (var-names (mapcar #'symbol-name var-syms)))
    (mapc
     (lambda (pair)
       (calc-push-list (list (cdr pair)))
       (calc-store-into (car pair)))
     vars)
    (mapc
     (lambda (line)
       (when (> (length line) 0)
	 (cond
	  ;; simple variable name
	  ((member line var-names) (calc-recall (intern line)))
	  ;; stack operation
	  ((string= "'" (substring line 0 1))
	   (funcall (lookup-key calc-mode-map (substring line 1)) nil))
	  ;; complex expression
	  (t
	   (calc-push-list
	    (list ((lambda (res)
		     (cond
		      ((numberp res) res)
		      ((math-read-number res) (math-read-number res))
		      ((listp res) (error "calc error \"%s\" on input \"%s\""
					  (cadr res) line))
72 73 74 75 76 77 78 79 80 81
		      (t (replace-regexp-in-string
			  "'\\[" "["
			  (calc-eval
			   (math-evaluate-expr
			    ;; resolve user variables, calc built in
			    ;; variables are handled automatically
			    ;; upstream by calc
			    (mapcar #'ob-calc-maybe-resolve-var
				    ;; parse line into calc objects
				    (car (math-read-exprs line)))))))))
Carsten Dominik's avatar
Carsten Dominik committed
82 83 84
		   (calc-eval line))))))))
     (mapcar #'org-babel-trim
	     (split-string (org-babel-expand-body:calc body params) "[\n\r]"))))
Carsten Dominik's avatar
Carsten Dominik committed
85
  (save-excursion
Carsten Dominik's avatar
Carsten Dominik committed
86 87
    (with-current-buffer (get-buffer "*Calculator*")
      (calc-eval (calc-top 1)))))
Carsten Dominik's avatar
Carsten Dominik committed
88

89 90 91 92 93 94 95 96 97 98 99
(defvar var-syms) ; Dynamically scoped from org-babel-execute:calc
(defun ob-calc-maybe-resolve-var (el)
  (if (consp el)
      (if (and (equal 'var (car el)) (member (cadr el) var-syms))
	  (progn
	    (calc-recall (cadr el))
	    (prog1 (calc-top 1)
	      (calc-pop 1)))
	(mapcar #'ob-calc-maybe-resolve-var el))
    el))

Carsten Dominik's avatar
Carsten Dominik committed
100 101
(provide 'ob-calc)

102
;; arch-tag: 5c57a3b7-5818-4c6c-acda-7a94831a6449
Carsten Dominik's avatar
Carsten Dominik committed
103 104

;;; ob-calc.el ends here