lisp/ob-calc.el

   1 ;;; ob-calc.el --- org-babel functions for calc code evaluation
   2
   3 ;; Copyright (C) 2010  Free Software Foundation, Inc
   4
   5 ;; Author: Eric Schulte
   6 ;; Keywords: literate programming, reproducible research
   7 ;; Homepage: http://orgmode.org
   8 ;; Version: 7.4
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  24
  25 ;;; Commentary:
  26
  27 ;; Org-Babel support for evaluating calc code
  28
  29 ;;; Code:
  30 (require 'ob)
  31 (require 'calc)
  32 (require 'calc-store)
  33 (unless (featurep 'xemacs) (require 'calc-trail))
  34 (eval-when-compile (require 'ob-comint))
  35
  36 (defvar org-babel-default-header-args:calc nil
  37   "Default arguments for evaluating an calc source block.")
  38
  39 (defun org-babel-expand-body:calc (body params)
  40   "Expand BODY according to PARAMS, return the expanded body." body)
  41
  42 (defun org-babel-execute:calc (body params)
  43   "Execute a block of calc code with Babel."
  44   (unless (get-buffer "*Calculator*")
  45     (save-window-excursion (calc) (calc-quit)))
  46   (let* ((vars (mapcar #'cdr (org-babel-get-header params :var)))
  47          (var-syms (mapcar #'car vars))
  48          (var-names (mapcar #'symbol-name var-syms)))
  49     (mapc
  50      (lambda (pair)
  51        (calc-push-list (list (cdr pair)))
  52        (calc-store-into (car pair)))
  53      vars)
  54     (mapc
  55      (lambda (line)
  56        (when (> (length line) 0)
  57          (cond
  58           ;; simple variable name
  59           ((member line var-names) (calc-recall (intern line)))
  60           ;; stack operation
  61           ((string= "'" (substring line 0 1))
  62            (funcall (lookup-key calc-mode-map (substring line 1)) nil))
  63           ;; complex expression
  64           (t
  65            (calc-push-list
  66             (list ((lambda (res)
  67                      (cond
  68                       ((numberp res) res)
  69                       ((math-read-number res) (math-read-number res))
  70                       ((listp res) (error "calc error \"%s\" on input \"%s\""
  71                                           (cadr res) line))
  72                       (t (replace-regexp-in-string
  73                           "'\\[" "["
  74                           (calc-eval
  75                            (math-evaluate-expr
  76                             ;; resolve user variables, calc built in
  77                             ;; variables are handled automatically
  78                             ;; upstream by calc
  79                             (mapcar #'ob-calc-maybe-resolve-var
  80                                     ;; parse line into calc objects
  81                                     (car (math-read-exprs line)))))))))
  82                    (calc-eval line))))))))
  83      (mapcar #'org-babel-trim
  84              (split-string (org-babel-expand-body:calc body params) "[\n\r]"))))
  85   (save-excursion
  86     (with-current-buffer (get-buffer "*Calculator*")
  87       (calc-eval (calc-top 1)))))
  88
  89 (defvar var-syms) ; Dynamically scoped from org-babel-execute:calc
  90 (defun ob-calc-maybe-resolve-var (el)
  91   (if (consp el)
  92       (if (and (equal 'var (car el)) (member (cadr el) var-syms))
  93           (progn
  94             (calc-recall (cadr el))
  95             (prog1 (calc-top 1)
  96               (calc-pop 1)))
  97         (mapcar #'ob-calc-maybe-resolve-var el))
  98     el))
  99
 100 (provide 'ob-calc)
 101
 102 ;; arch-tag: 5c57a3b7-5818-4c6c-acda-7a94831a6449
 103
 104 ;;; ob-calc.el ends here