summaryrefslogtreecommitdiff
path: root/lisp/ob-C.el
blob: c460be326f82a8c6d02bfecf248215149eab6e24 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
;;; ob-C.el --- org-babel functions for C and similar languages

;; Copyright (C) 2010-2014 Free Software Foundation, Inc.

;; Author: Eric Schulte
;; Keywords: literate programming, reproducible research
;; Homepage: http://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 <http://www.gnu.org/licenses/>.

;;; Commentary:

;; Org-Babel support for evaluating C code.
;;
;; very limited implementation:
;; - currently only support :results output
;; - not much in the way of error feedback

;;; Code:
(require 'ob)
(require 'cc-mode)

(declare-function org-entry-get "org"
		  (pom property &optional inherit literal-nil))


(defvar org-babel-tangle-lang-exts)
(add-to-list 'org-babel-tangle-lang-exts '("C++" . "cpp"))

(defvar org-babel-default-header-args:C '())

(defvar org-babel-C-compiler "gcc"
  "Command used to compile a C source code file into an
executable.")

(defvar org-babel-C++-compiler "g++"
  "Command used to compile a C++ source code file into an
executable.")

(defvar org-babel-c-variant nil
  "Internal variable used to hold which type of C (e.g. C or C++)
is currently being evaluated.")

(defun org-babel-execute:cpp (body params)
  "Execute BODY according to PARAMS.
This function calls `org-babel-execute:C++'."
  (org-babel-execute:C++ body params))

(defun org-babel-execute:C++ (body params)
  "Execute a block of C++ code with org-babel.
This function is called by `org-babel-execute-src-block'."
  (let ((org-babel-c-variant 'cpp)) (org-babel-C-execute body params)))

(defun org-babel-expand-body:C++ (body params)
  "Expand a block of C++ code with org-babel according to it's
header arguments (calls `org-babel-C-expand')."
  (let ((org-babel-c-variant 'cpp)) (org-babel-C-expand body params)))

(defun org-babel-execute:C (body params)
  "Execute a block of C code with org-babel.
This function is called by `org-babel-execute-src-block'."
  (let ((org-babel-c-variant 'c)) (org-babel-C-execute body params)))

(defun org-babel-expand-body:c (body params)
  "Expand a block of C code with org-babel according to it's
header arguments (calls `org-babel-C-expand')."
  (let ((org-babel-c-variant 'c)) (org-babel-C-expand body params)))

(defun org-babel-C-execute (body params)
  "This function should only be called by `org-babel-execute:C'
or `org-babel-execute:C++'."
  (let* ((tmp-src-file (org-babel-temp-file
			"C-src-"
			(cond
			 ((equal org-babel-c-variant 'c) ".c")
			 ((equal org-babel-c-variant 'cpp) ".cpp"))))
         (tmp-bin-file (org-babel-temp-file "C-bin-" org-babel-exeext))
         (cmdline (cdr (assoc :cmdline params)))
         (flags (cdr (assoc :flags params)))
         (full-body (org-babel-C-expand body params))
         (compile
	  (progn
	    (with-temp-file tmp-src-file (insert full-body))
	    (org-babel-eval
	     (format "%s -o %s %s %s"
		     (cond
		      ((equal org-babel-c-variant 'c) org-babel-C-compiler)
		      ((equal org-babel-c-variant 'cpp) org-babel-C++-compiler))
		     (org-babel-process-file-name tmp-bin-file)
		     (mapconcat 'identity
				(if (listp flags) flags (list flags)) " ")
		     (org-babel-process-file-name tmp-src-file)) ""))))
    (let ((results
           (org-babel-trim
            (org-babel-eval
             (concat tmp-bin-file (if cmdline (concat " " cmdline) "")) ""))))
      (org-babel-reassemble-table
       (org-babel-result-cond (cdr (assoc :result-params params))
	 (org-babel-read results)
         (let ((tmp-file (org-babel-temp-file "c-")))
           (with-temp-file tmp-file (insert results))
           (org-babel-import-elisp-from-file tmp-file)))
       (org-babel-pick-name
        (cdr (assoc :colname-names params)) (cdr (assoc :colnames params)))
       (org-babel-pick-name
        (cdr (assoc :rowname-names params)) (cdr (assoc :rownames params)))))
    ))

(defun org-babel-C-expand (body params)
  "Expand a block of C or C++ code with org-babel according to
it's header arguments."
  (let ((vars (mapcar #'cdr (org-babel-get-header params :var)))
        (main-p (not (string= (cdr (assoc :main params)) "no")))
        (includes (or (cdr (assoc :includes params))
                      (org-babel-read (org-entry-get nil "includes" t))))
        (defines (org-babel-read
                  (or (cdr (assoc :defines params))
                      (org-babel-read (org-entry-get nil "defines" t))))))
    (mapconcat 'identity
	       (list
		;; includes
		(mapconcat
		 (lambda (inc) (format "#include %s" inc))
		 (if (listp includes) includes (list includes)) "\n")
		;; defines
		(mapconcat
		 (lambda (inc) (format "#define %s" inc))
		 (if (listp defines) defines (list defines)) "\n")
		;; variables
		(mapconcat 'org-babel-C-var-to-C vars "\n")
		;; body
		(if main-p
		    (org-babel-C-ensure-main-wrap body)
		  body) "\n") "\n")))

(defun org-babel-C-ensure-main-wrap (body)
  "Wrap BODY in a \"main\" function call if none exists."
  (if (string-match "^[ \t]*[intvod]+[ \t\n\r]*main[ \t]*(.*)" body)
      body
    (format "int main() {\n%s\nreturn 0;\n}\n" body)))

(defun org-babel-prep-session:C (session params)
  "This function does nothing as C is a compiled language with no
support for sessions"
  (error "C is a compiled languages -- no support for sessions"))

(defun org-babel-load-session:C (session body params)
  "This function does nothing as C is a compiled language with no
support for sessions"
  (error "C is a compiled languages -- no support for sessions"))

;; helper functions

(defun org-babel-C-format-val (type val)
  "Handle the FORMAT part of TYPE with the data from VAL."
  (let ((format-data (cadr type)))
    (if (stringp format-data)
	(cons "" (format format-data val))
      (funcall format-data val))))

(defun org-babel-C-val-to-C-type (val)
  "Determine the type of VAL.
Return a list (TYPE-NAME FORMAT).  TYPE-NAME should be the name of the type.
FORMAT can be either a format string or a function which is called with VAL."
  (cond
   ((integerp val) '("int" "%d"))
   ((floatp val) '("double" "%f"))
   ((or (listp val) (vectorp val))
    (lexical-let ((type (org-babel-C-val-to-C-list-type val)))
      (list (car type)
	    (lambda (val)
	      (cons
	       (format "[%d]%s"
		       (length val)
		       (car (org-babel-C-format-val type (elt val 0))))
	       (concat "{ "
		       (mapconcat (lambda (v)
				    (cdr (org-babel-C-format-val type v)))
				  val
				  ", ")
		       " }"))))))
   (t ;; treat unknown types as string
    '("char" (lambda (val)
	       (let ((s (format "%s" val))) ;; convert to string for unknown types
		 (cons (format "[%d]" (1+ (length s)))
		       (concat "\"" s "\""))))))))

(defun org-babel-C-val-to-C-list-type (val)
  "Determine the C array type of a VAL."
  (let (type)
    (mapc
     #'(lambda (i)
	 (let* ((tmp-type (org-babel-C-val-to-C-type i))
		(type-name (car type))
		(tmp-type-name (car tmp-type)))
	   (when (and type (not (string= type-name tmp-type-name)))
	     (if (and (member type-name '("int" "double" "int32_t"))
		      (member tmp-type-name '("int" "double" "int32_t")))
		 (setq tmp-type '("double" "" "%f"))
	       (error "Only homogeneous lists are supported by C.  You can not mix %s and %s"
		      type-name
		      tmp-type-name)))
	   (setq type tmp-type)))
     val)
    type))

(defun org-babel-C-var-to-C (pair)
  "Convert an elisp val into a string of C code specifying a var
of the same value."
  ;; TODO list support
  (let ((var (car pair))
        (val (cdr pair)))
    (when (symbolp val)
      (setq val (symbol-name val))
      (when (= (length val) 1)
        (setq val (string-to-char val))))
    (let* ((type-data (org-babel-C-val-to-C-type val))
	   (type (car type-data))
	   (formated (org-babel-C-format-val type-data val))
	   (suffix (car formated))
	   (data (cdr formated)))
      (format "%s %s%s = %s;"
	      type
	      var
	      suffix
	      data))))

(provide 'ob-C)

;;; ob-C.el ends here