lisp/ob-ocaml.el

   1 ;;; ob-ocaml.el --- Babel Functions for Ocaml        -*- lexical-binding: t; -*-
   2
   3 ;; Copyright (C) 2009-2017 Free Software Foundation, Inc.
   4
   5 ;; Author: Eric Schulte
   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 <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;; Org-Babel support for evaluating ocaml source code.  This one will
  27 ;; be sort of tricky because ocaml programs must be compiled before
  28 ;; they can be run, but ocaml code can also be run through an
  29 ;; interactive interpreter.
  30 ;;
  31 ;; For now lets only allow evaluation using the ocaml interpreter.
  32
  33 ;;; Requirements:
  34
  35 ;; - tuareg-mode :: http://www-rocq.inria.fr/~acohen/tuareg/
  36
  37 ;;; Code:
  38 (require 'ob)
  39 (require 'comint)
  40
  41 (declare-function tuareg-run-caml "ext:tuareg" ())
  42 (declare-function tuareg-run-ocaml "ext:tuareg" ())
  43 (declare-function tuareg-interactive-send-input "ext:tuareg" ())
  44 (declare-function org-trim "org" (s &optional keep-lead))
  45
  46 (defvar org-babel-tangle-lang-exts)
  47 (add-to-list 'org-babel-tangle-lang-exts '("ocaml" . "ml"))
  48
  49 (defvar org-babel-default-header-args:ocaml '())
  50
  51 (defvar org-babel-ocaml-eoe-indicator "\"org-babel-ocaml-eoe\";;")
  52 (defvar org-babel-ocaml-eoe-output "org-babel-ocaml-eoe")
  53
  54 (defcustom org-babel-ocaml-command "ocaml"
  55   "Name of the command for executing Ocaml code."
  56   :version "24.4"
  57   :package-version '(Org . "8.0")
  58   :group 'org-babel
  59   :type 'string)
  60
  61 (defun org-babel-execute:ocaml (body params)
  62   "Execute a block of Ocaml code with Babel."
  63   (let* ((full-body (org-babel-expand-body:generic
  64                      body params
  65                      (org-babel-variable-assignments:ocaml params)))
  66          (session (org-babel-prep-session:ocaml
  67                    (cdr (assq :session params)) params))
  68          (raw (org-babel-comint-with-output
  69                   (session org-babel-ocaml-eoe-output nil full-body)
  70                 (insert
  71                  (concat
  72                   (org-babel-chomp full-body) ";;\n"
  73                   org-babel-ocaml-eoe-indicator))
  74                 (tuareg-interactive-send-input)))
  75          (clean
  76           (car (let ((re (regexp-quote org-babel-ocaml-eoe-output)) out)
  77                  (delq nil (mapcar (lambda (line)
  78                                      (if out
  79                                          (progn (setq out nil) line)
  80                                        (when (string-match re line)
  81                                          (progn (setq out t) nil))))
  82                                    (mapcar #'org-trim (reverse raw)))))))
  83          (raw (org-trim clean))
  84          (result-params (cdr (assq :result-params params))))
  85     (string-match
  86      "\\(\\(.*\n\\)*\\)[^:\n]+ : \\([^=\n]+\\) =\\(\n\\| \\)\\(.+\\)$"
  87      raw)
  88     (let ((output (match-string 1 raw))
  89           (type (match-string 3 raw))
  90           (value (match-string 5 raw)))
  91       (org-babel-reassemble-table
  92        (org-babel-result-cond result-params
  93          (cond
  94           ((member "verbatim" result-params) raw)
  95           ((member "output" result-params) output)
  96           (t raw))
  97          (if (and value type)
  98              (org-babel-ocaml-parse-output value type)
  99            raw))
 100        (org-babel-pick-name
 101         (cdr (assq :colname-names params)) (cdr (assq :colnames params)))
 102        (org-babel-pick-name
 103         (cdr (assq :rowname-names params)) (cdr (assq :rownames params)))))))
 104
 105 (defvar tuareg-interactive-buffer-name)
 106 (defun org-babel-prep-session:ocaml (session _params)
 107   "Prepare SESSION according to the header arguments in PARAMS."
 108   (require 'tuareg)
 109   (let ((tuareg-interactive-buffer-name (if (and (not (string= session "none"))
 110                                                  (not (string= session "default"))
 111                                                  (stringp session))
 112                                             session
 113                                           tuareg-interactive-buffer-name)))
 114     (save-window-excursion (if (fboundp 'tuareg-run-process-if-needed)
 115          (tuareg-run-process-if-needed org-babel-ocaml-command)
 116        (tuareg-run-caml)))
 117     (get-buffer tuareg-interactive-buffer-name)))
 118
 119 (defun org-babel-variable-assignments:ocaml (params)
 120   "Return list of ocaml statements assigning the block's variables."
 121   (mapcar
 122    (lambda (pair) (format "let %s = %s;;" (car pair)
 123                           (org-babel-ocaml-elisp-to-ocaml (cdr pair))))
 124    (org-babel--get-vars params)))
 125
 126 (defun org-babel-ocaml-elisp-to-ocaml (val)
 127   "Return a string of ocaml code which evaluates to VAL."
 128   (if (listp val)
 129       (concat "[|" (mapconcat #'org-babel-ocaml-elisp-to-ocaml val "; ") "|]")
 130     (format "%S" val)))
 131
 132 (defun org-babel-ocaml-parse-output (value type)
 133   "Parse VALUE of type TYPE.
 134 VALUE and TYPE are string output from an ocaml process."
 135   (cond
 136    ((string= "string" type)
 137     (org-babel-read value))
 138    ((or (string= "int" type)
 139         (string= "float" type))
 140     (string-to-number value))
 141    ((string-match "list" type)
 142     (org-babel-ocaml-read-list value))
 143    ((string-match "array" type)
 144     (org-babel-ocaml-read-array value))
 145    (t (message "don't recognize type %s" type) value)))
 146
 147 (defun org-babel-ocaml-read-list (results)
 148   "Convert RESULTS into an elisp table or string.
 149 If the results look like a table, then convert them into an
 150 Emacs-lisp table, otherwise return the results as a string."
 151   ;; XXX: This probably does not behave as expected when a semicolon
 152   ;; is in a string in a list.  The same comment applies to
 153   ;; `org-babel-ocaml-read-array' below (with even more failure
 154   ;; modes).
 155   (org-babel-script-escape (replace-regexp-in-string ";" "," results)))
 156
 157 (defun org-babel-ocaml-read-array (results)
 158   "Convert RESULTS into an elisp table or string.
 159 If the results look like a table, then convert them into an
 160 Emacs-lisp table, otherwise return the results as a string."
 161   (org-babel-script-escape
 162    (replace-regexp-in-string
 163     "\\[|" "[" (replace-regexp-in-string
 164                 "|\\]" "]" (replace-regexp-in-string
 165                             "; " "," results)))))
 166
 167 (provide 'ob-ocaml)
 168
 169
 170
 171 ;;; ob-ocaml.el ends here