lisp/ob-forth.el

   1 ;;; ob-forth.el --- Babel Functions for Forth        -*- lexical-binding: t; -*-
   2
   3 ;; Copyright (C) 2014-2019 Free Software Foundation, Inc.
   4
   5 ;; Author: Eric Schulte
   6 ;; Keywords: literate programming, reproducible research, forth
   7 ;; Homepage: https://orgmode.org
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;; Requires the gforth forth compiler and `forth-mode' (see below).
  27 ;; https://www.gnu.org/software/gforth/
  28
  29 ;;; Requirements:
  30
  31 ;; Session evaluation requires the gforth forth compiler as well as
  32 ;; `forth-mode' which is distributed with gforth (in gforth.el).
  33
  34 ;;; Code:
  35 (require 'ob)
  36 (require 'org-macs)
  37
  38 (declare-function forth-proc "ext:gforth" ())
  39
  40 (defvar org-babel-default-header-args:forth '((:session . "yes"))
  41   "Default header arguments for forth code blocks.")
  42
  43 (defun org-babel-execute:forth (body params)
  44   "Execute a block of Forth code with org-babel.
  45 This function is called by `org-babel-execute-src-block'"
  46   (if (string= "none" (cdr (assq :session params)))
  47       (error "Non-session evaluation not supported for Forth code blocks")
  48     (let ((all-results (org-babel-forth-session-execute body params)))
  49       (if (member "output" (cdr (assq :result-params params)))
  50           (mapconcat #'identity all-results "\n")
  51         (car (last all-results))))))
  52
  53 (defun org-babel-forth-session-execute (body params)
  54   (require 'forth-mode)
  55   (let ((proc (forth-proc))
  56         (rx " \\(\n:\\|compiled\n\\|ok\n\\)")
  57         (result-start))
  58     (with-current-buffer (process-buffer (forth-proc))
  59       (mapcar (lambda (line)
  60                 (setq result-start (progn (goto-char (process-mark proc))
  61                                           (point)))
  62                 (comint-send-string proc (concat line "\n"))
  63                 ;; wait for forth to say "ok"
  64                 (while (not (progn (goto-char result-start)
  65                                    (re-search-forward rx nil t)))
  66                   (accept-process-output proc 0.01))
  67                 (let ((case (match-string 1)))
  68                   (cond
  69                    ((string= "ok\n" case)
  70                     ;; Collect intermediate output.
  71                     (buffer-substring (+ result-start 1 (length line))
  72                                       (match-beginning 0)))
  73                    ((string= "compiled\n" case))
  74                    ;; Ignore partial compilation.
  75                    ((string= "\n:" case)
  76                     ;; Report errors.
  77                     (org-babel-eval-error-notify 1
  78                      (buffer-substring
  79                       (+ (match-beginning 0) 1) (point-max))) nil))))
  80               (split-string (org-trim
  81                              (org-babel-expand-body:generic body params))
  82                             "\n"
  83                             'omit-nulls)))))
  84
  85 (provide 'ob-forth)
  86
  87 ;;; ob-forth.el ends here