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;;; ob-calc.el --- Babel Functions for Calc -*- lexical-binding: t; -*-
;; Copyright (C) 2010-2020 Free Software Foundation, Inc.
;; Author: Eric Schulte
;; Keywords: literate programming, reproducible research
;; Homepage: https://orgmode.org
;; 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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Org-Babel support for evaluating calc code
;;; Code:
(require 'ob)
(require 'org-macs)
(require 'calc)
(require 'calc-trail)
(require 'calc-store)
(declare-function calc-store-into "calc-store" (&optional var))
(declare-function calc-recall "calc-store" (&optional var))
(declare-function math-evaluate-expr "calc-ext" (x))
(defvar org-babel-default-header-args:calc nil
"Default arguments for evaluating a calc source block.")
(defun org-babel-expand-body:calc (body _params)
"Expand BODY according to PARAMS, return the expanded body." body)
(defvar org--var-syms) ; Dynamically scoped from org-babel-execute:calc
(defun org-babel-execute:calc (body params)
"Execute a block of calc code with Babel."
(unless (get-buffer "*Calculator*")
(save-window-excursion (calc) (calc-quit)))
(let* ((vars (org-babel--get-vars params))
(org--var-syms (mapcar #'car vars))
(var-names (mapcar #'symbol-name org--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 (let ((res (calc-eval line)))
(cond
((numberp res) res)
((math-read-number res) (math-read-number res))
((listp res) (error "Calc error \"%s\" on input \"%s\""
(cadr res) line))
(t (replace-regexp-in-string
"'" ""
(calc-eval
(math-evaluate-expr
;; resolve user variables, calc built in
;; variables are handled automatically
;; upstream by calc
(mapcar #'org-babel-calc-maybe-resolve-var
;; parse line into calc objects
(car (math-read-exprs line)))))))))
))))))
(mapcar #'org-trim
(split-string (org-babel-expand-body:calc body params) "[\n\r]"))))
(save-excursion
(with-current-buffer (get-buffer "*Calculator*")
(prog1
(calc-eval (calc-top 1))
(calc-pop 1)))))
(defun org-babel-calc-maybe-resolve-var (el)
(if (consp el)
(if (and (eq 'var (car el)) (member (cadr el) org--var-syms))
(progn
(calc-recall (cadr el))
(prog1 (calc-top 1)
(calc-pop 1)))
(mapcar #'org-babel-calc-maybe-resolve-var el))
el))
(provide 'ob-calc)
;;; ob-calc.el ends here
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