lisp/ob-J.el

   1 ;;; ob-J.el --- Babel Functions for J                -*- lexical-binding: t; -*-
   2
   3 ;; Copyright (C) 2011-2017 Free Software Foundation, Inc.
   4
   5 ;; Author: Oleh Krehel
   6 ;; Keywords: literate programming, reproducible research
   7 ;; Homepage: http://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 ;; Org-Babel support for evaluating J code.
  27 ;;
  28 ;; Session interaction depends on `j-console' from package `j-mode'
  29 ;; (available in MELPA).
  30
  31 ;;; Code:
  32 \f
  33 (require 'ob)
  34
  35 (declare-function org-trim "org" (s &optional keep-lead))
  36 (declare-function j-console-ensure-session "ext:j-console" ())
  37
  38 (defcustom org-babel-J-command "jconsole"
  39   "Command to call J."
  40   :group 'org-babel
  41   :version "26.1"
  42   :package-version '(Org . "9.0")
  43   :type 'string)
  44
  45 (defun org-babel-expand-body:J (body _params &optional _processed-params)
  46   "Expand BODY according to PARAMS, return the expanded body.
  47 PROCESSED-PARAMS isn't used yet."
  48   (org-babel-J-interleave-echos-except-functions body))
  49
  50 (defun org-babel-J-interleave-echos (body)
  51   "Interleave echo',' between each source line of BODY."
  52   (mapconcat #'identity (split-string body "\n") "\necho','\n"))
  53
  54 (defun org-babel-J-interleave-echos-except-functions (body)
  55   "Interleave echo',' between source lines of BODY that aren't functions."
  56   (if (obj-string-match-m "\\(?:^\\|\n\\)[^\n]*\\(?:0\\|1\\|2\\|3\\|4\\|dyad\\) : 0\n.*\n)\\(?:\n\\|$\\)" body)
  57       (let ((s1 (substring body 0 (match-beginning 0)))
  58             (s2 (match-string 0 body))
  59             (s3 (substring body (match-end 0))))
  60         (concat
  61          (if (string= s1 "")
  62              ""
  63            (concat (org-babel-J-interleave-echos s1)
  64                    "\necho','\n"))
  65          s2
  66          "\necho','\n"
  67          (org-babel-J-interleave-echos-except-functions s3)))
  68     (org-babel-J-interleave-echos body)))
  69
  70 (defalias 'org-babel-execute:j 'org-babel-execute:J)
  71
  72 (defun org-babel-execute:J (body params)
  73   "Execute a block of J code BODY.
  74 PARAMS are given by org-babel.
  75 This function is called by `org-babel-execute-src-block'"
  76   (message "executing J source code block")
  77   (let* ((processed-params (org-babel-process-params params))
  78          (sessionp (cdr (assq :session params)))
  79          (full-body (org-babel-expand-body:J
  80                      body params processed-params))
  81          (tmp-script-file (org-babel-temp-file "J-src")))
  82     (org-babel-j-initiate-session sessionp)
  83     (org-babel-J-strip-whitespace
  84      (if (string= sessionp "none")
  85          (progn
  86            (with-temp-file tmp-script-file
  87              (insert full-body))
  88            (org-babel-eval (format "%s < %s" org-babel-J-command tmp-script-file) ""))
  89        (org-babel-J-eval-string full-body)))))
  90
  91 (defun org-babel-J-eval-string (str)
  92   "Sends STR to the `j-console-cmd' session and executes it."
  93   (let ((session (j-console-ensure-session)))
  94     (with-current-buffer (process-buffer session)
  95       (goto-char (point-max))
  96       (insert (format "\n%s\n" str))
  97       (let ((beg (point)))
  98         (comint-send-input)
  99         (sit-for .1)
 100         (buffer-substring-no-properties
 101          beg (point-max))))))
 102
 103 (defun org-babel-J-strip-whitespace (str)
 104   "Remove whitespace from jconsole output STR."
 105   (mapconcat
 106    #'identity
 107    (delete "" (mapcar
 108                #'org-babel-J-print-block
 109                (split-string str "^ *,\n" t)))
 110    "\n\n"))
 111
 112 (defun obj-get-string-alignment (str)
 113   "Return a number to describe STR alignment.
 114 STR represents a table.
 115 Positive/negative/zero result means right/left/undetermined.
 116 Don't trust first line."
 117   (let* ((str (org-trim str))
 118          (lines (split-string str "\n" t))
 119          n1 n2)
 120     (cond ((<= (length lines) 1)
 121            0)
 122           ((= (length lines) 2)
 123            ;; numbers are right-aligned
 124            (if (and
 125                 (numberp (read (car lines)))
 126                 (numberp (read (cadr lines)))
 127                 (setq n1 (obj-match-second-space-right (nth 0 lines)))
 128                 (setq n2 (obj-match-second-space-right (nth 1 lines))))
 129                n2
 130              0))
 131           ((not (obj-match-second-space-left (nth 0 lines)))
 132            0)
 133           ((and
 134             (setq n1 (obj-match-second-space-left (nth 1 lines)))
 135             (setq n2 (obj-match-second-space-left (nth 2 lines)))
 136             (= n1 n2))
 137            n1)
 138           ((and
 139             (setq n1 (obj-match-second-space-right (nth 1 lines)))
 140             (setq n2 (obj-match-second-space-right (nth 2 lines)))
 141             (= n1 n2))
 142            (- n1))
 143           (t 0))))
 144
 145 (defun org-babel-J-print-block (x)
 146   "Prettify jconsole output X."
 147   (let* ((x (org-trim x))
 148          (a (obj-get-string-alignment x))
 149          (lines (split-string x "\n" t))
 150          b)
 151     (cond ((< a 0)
 152            (setq b (obj-match-second-space-right (nth 0 lines)))
 153            (concat (make-string (+ a b) ? ) x))
 154           ((> a 0)
 155            (setq b (obj-match-second-space-left (nth 0 lines)))
 156            (concat (make-string (- a b) ? ) x))
 157           (t x))))
 158
 159 (defun obj-match-second-space-left (s)
 160   "Return position of leftmost space in second space block of S or nil."
 161   (and (string-match "^ *[^ ]+\\( \\)" s)
 162        (match-beginning 1)))
 163
 164 (defun obj-match-second-space-right (s)
 165   "Return position of rightmost space in second space block of S or nil."
 166   (and (string-match "^ *[^ ]+ *\\( \\)[^ ]" s)
 167        (match-beginning 1)))
 168
 169 (defun obj-string-match-m (regexp string &optional start)
 170   "Call (string-match REGEXP STRING START).
 171 REGEXP is modified so that .* matches newlines as well."
 172   (string-match
 173    (replace-regexp-in-string "\\.\\*" "[\0-\377[:nonascii:]]*" regexp)
 174    string
 175    start))
 176
 177 (defun org-babel-j-initiate-session (&optional session)
 178   "Initiate a J session.
 179 SESSION is a parameter given by org-babel."
 180   (unless (string= session "none")
 181     (require 'j-console)
 182     (j-console-ensure-session)))
 183
 184 (provide 'ob-J)
 185
 186 ;;; ob-J.el ends here