lisp/ob-C.el

   1 ;;; ob-C.el --- Babel Functions for C and Similar Languages -*- lexical-binding: t; -*-
   2
   3 ;; Copyright (C) 2010-2016 Free Software Foundation, Inc.
   4
   5 ;; Author: Eric Schulte
   6 ;;      Thierry Banel
   7 ;; Keywords: literate programming, reproducible research
   8 ;; Homepage: http://orgmode.org
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  24
  25 ;;; Commentary:
  26
  27 ;; Org-Babel support for evaluating C, C++, D code.
  28 ;;
  29 ;; very limited implementation:
  30 ;; - currently only support :results output
  31 ;; - not much in the way of error feedback
  32
  33 ;;; Code:
  34
  35 (require 'cc-mode)
  36 (require 'ob)
  37
  38
  39 (declare-function org-entry-get "org" (pom property &optional inherit literal-nil))
  40 (declare-function org-remove-indentation "org" (code &optional n))
  41 (declare-function org-trim "org" (s &optional keep-lead))
  42
  43 (defvar org-babel-tangle-lang-exts)
  44 (add-to-list 'org-babel-tangle-lang-exts '("C++" . "cpp"))
  45 (add-to-list 'org-babel-tangle-lang-exts '("D" . "d"))
  46
  47 (defvar org-babel-default-header-args:C '())
  48
  49 (defcustom org-babel-C-compiler "gcc"
  50   "Command used to compile a C source code file into an executable.
  51 May be either a command in the path, like gcc
  52 or an absolute path name, like /usr/local/bin/gcc
  53 parameter may be used, like gcc -v"
  54   :group 'org-babel
  55   :version "24.3"
  56   :type 'string)
  57
  58 (defcustom org-babel-C++-compiler "g++"
  59   "Command used to compile a C++ source code file into an executable.
  60 May be either a command in the path, like g++
  61 or an absolute path name, like /usr/local/bin/g++
  62 parameter may be used, like g++ -v"
  63   :group 'org-babel
  64   :version "24.3"
  65   :type 'string)
  66
  67 (defcustom org-babel-D-compiler "rdmd"
  68   "Command used to compile and execute a D source code file.
  69 May be either a command in the path, like rdmd
  70 or an absolute path name, like /usr/local/bin/rdmd
  71 parameter may be used, like rdmd --chatty"
  72   :group 'org-babel
  73   :version "24.3"
  74   :type 'string)
  75
  76 (defvar org-babel-c-variant nil
  77   "Internal variable used to hold which type of C (e.g. C or C++ or D)
  78 is currently being evaluated.")
  79
  80 (defun org-babel-execute:cpp (body params)
  81   "Execute BODY according to PARAMS.
  82 This function calls `org-babel-execute:C++'."
  83   (org-babel-execute:C++ body params))
  84
  85 (defun org-babel-expand-body:cpp (body params)
  86   "Expand a block of C++ code with org-babel according to its
  87 header arguments."
  88   (org-babel-expand-body:C++ body params))
  89
  90 (defun org-babel-execute:C++ (body params)
  91   "Execute a block of C++ code with org-babel.
  92 This function is called by `org-babel-execute-src-block'."
  93   (let ((org-babel-c-variant 'cpp)) (org-babel-C-execute body params)))
  94
  95 (defun org-babel-expand-body:C++ (body params)
  96   "Expand a block of C++ code with org-babel according to its
  97 header arguments."
  98   (let ((org-babel-c-variant 'cpp)) (org-babel-C-expand-C++ body params)))
  99
 100 (defun org-babel-execute:D (body params)
 101   "Execute a block of D code with org-babel.
 102 This function is called by `org-babel-execute-src-block'."
 103   (let ((org-babel-c-variant 'd)) (org-babel-C-execute body params)))
 104
 105 (defun org-babel-expand-body:D (body params)
 106   "Expand a block of D code with org-babel according to its
 107 header arguments."
 108   (let ((org-babel-c-variant 'd)) (org-babel-C-expand-D body params)))
 109
 110 (defun org-babel-execute:C (body params)
 111   "Execute a block of C code with org-babel.
 112 This function is called by `org-babel-execute-src-block'."
 113   (let ((org-babel-c-variant 'c)) (org-babel-C-execute body params)))
 114
 115 (defun org-babel-expand-body:C (body params)
 116   "Expand a block of C code with org-babel according to its
 117 header arguments."
 118   (let ((org-babel-c-variant 'c)) (org-babel-C-expand-C body params)))
 119
 120 (defun org-babel-C-execute (body params)
 121   "This function should only be called by `org-babel-execute:C'
 122 or `org-babel-execute:C++' or `org-babel-execute:D'."
 123   (let* ((tmp-src-file (org-babel-temp-file
 124                         "C-src-"
 125                         (pcase org-babel-c-variant
 126                           (`c ".c") (`cpp ".cpp") (`d ".d"))))
 127          (tmp-bin-file                  ;not used for D
 128           (org-babel-temp-file "C-bin-" org-babel-exeext))
 129          (cmdline (cdr (assq :cmdline params)))
 130          (cmdline (if cmdline (concat " " cmdline) ""))
 131          (flags (cdr (assq :flags params)))
 132          (flags (mapconcat 'identity
 133                            (if (listp flags) flags (list flags)) " "))
 134          (libs (org-babel-read
 135                 (or (cdr (assq :libs params))
 136                     (org-entry-get nil "libs" t))
 137                 nil))
 138          (libs (mapconcat #'identity
 139                           (if (listp libs) libs (list libs))
 140                           " "))
 141          (full-body
 142           (pcase org-babel-c-variant
 143             (`c (org-babel-C-expand-C body params))
 144             (`cpp (org-babel-C-expand-C++ body params))
 145             (`d (org-babel-C-expand-D body params)))))
 146     (with-temp-file tmp-src-file (insert full-body))
 147     (pcase org-babel-c-variant
 148       ((or `c `cpp)
 149        (org-babel-eval
 150         (format "%s -o %s %s %s %s"
 151                 (pcase org-babel-c-variant
 152                   (`c org-babel-C-compiler)
 153                   (`cpp org-babel-C++-compiler))
 154                 (org-babel-process-file-name tmp-bin-file)
 155                 flags
 156                 (org-babel-process-file-name tmp-src-file)
 157                 libs)
 158         ""))
 159       (`d nil)) ;; no separate compilation for D
 160     (let ((results
 161            (org-babel-eval
 162             (pcase org-babel-c-variant
 163               ((or `c `cpp)
 164                (concat tmp-bin-file cmdline))
 165               (`d
 166                (format "%s %s %s %s"
 167                        org-babel-D-compiler
 168                        flags
 169                        (org-babel-process-file-name tmp-src-file)
 170                        cmdline)))
 171             "")))
 172       (when results
 173         (setq results (org-trim (org-remove-indentation results)))
 174         (org-babel-reassemble-table
 175          (org-babel-result-cond (cdr (assq :result-params params))
 176            (org-babel-read results t)
 177            (let ((tmp-file (org-babel-temp-file "c-")))
 178              (with-temp-file tmp-file (insert results))
 179              (org-babel-import-elisp-from-file tmp-file)))
 180          (org-babel-pick-name
 181           (cdr (assq :colname-names params)) (cdr (assq :colnames params)))
 182          (org-babel-pick-name
 183           (cdr (assq :rowname-names params)) (cdr (assq :rownames params)))))
 184       )))
 185
 186 (defun org-babel-C-expand-C++ (body params)
 187   "Expand a block of C or C++ code with org-babel according to
 188 its header arguments."
 189   (org-babel-C-expand-C body params))
 190
 191 (defun org-babel-C-expand-C (body params)
 192   "Expand a block of C or C++ code with org-babel according to
 193 its header arguments."
 194   (let ((vars (org-babel--get-vars params))
 195         (colnames (cdr (assq :colname-names params)))
 196         (main-p (not (string= (cdr (assq :main params)) "no")))
 197         (includes (org-babel-read
 198                    (or (cdr (assq :includes params))
 199                        (org-entry-get nil "includes" t))
 200                    nil))
 201         (defines (org-babel-read
 202                   (or (cdr (assq :defines params))
 203                       (org-entry-get nil "defines" t))
 204                   nil)))
 205     (when (stringp includes)
 206       (setq includes (split-string includes)))
 207     (when (stringp defines)
 208       (let ((y nil)
 209             (result (list t)))
 210         (dolist (x (split-string defines))
 211           (if (null y)
 212               (setq y x)
 213             (nconc result (list (concat y " " x)))
 214             (setq y nil)))
 215         (setq defines (cdr result))))
 216     (mapconcat 'identity
 217                (list
 218                 ;; includes
 219                 (mapconcat
 220                  (lambda (inc) (format "#include %s" inc))
 221                  includes "\n")
 222                 ;; defines
 223                 (mapconcat
 224                  (lambda (inc) (format "#define %s" inc))
 225                  (if (listp defines) defines (list defines)) "\n")
 226                 ;; variables
 227                 (mapconcat 'org-babel-C-var-to-C vars "\n")
 228                 ;; table sizes
 229                 (mapconcat 'org-babel-C-table-sizes-to-C vars "\n")
 230                 ;; tables headers utility
 231                 (when colnames
 232                   (org-babel-C-utility-header-to-C))
 233                 ;; tables headers
 234                 (mapconcat 'org-babel-C-header-to-C colnames "\n")
 235                 ;; body
 236                 (if main-p
 237                     (org-babel-C-ensure-main-wrap body)
 238                   body) "\n") "\n")))
 239
 240 (defun org-babel-C-expand-D (body params)
 241   "Expand a block of D code with org-babel according to
 242 its header arguments."
 243   (let ((vars (org-babel--get-vars params))
 244         (colnames (cdr (assq :colname-names params)))
 245         (main-p (not (string= (cdr (assq :main params)) "no")))
 246         (imports (or (cdr (assq :imports params))
 247                      (org-babel-read (org-entry-get nil "imports" t)))))
 248     (when (stringp imports)
 249       (setq imports (split-string imports)))
 250     (setq imports (append imports '("std.stdio" "std.conv")))
 251     (mapconcat 'identity
 252                (list
 253                 "module mmm;"
 254                 ;; imports
 255                 (mapconcat
 256                  (lambda (inc) (format "import %s;" inc))
 257                  imports "\n")
 258                 ;; variables
 259                 (mapconcat 'org-babel-C-var-to-C vars "\n")
 260                 ;; table sizes
 261                 (mapconcat 'org-babel-C-table-sizes-to-C vars "\n")
 262                 ;; tables headers utility
 263                 (when colnames
 264                   (org-babel-C-utility-header-to-C))
 265                 ;; tables headers
 266                 (mapconcat 'org-babel-C-header-to-C colnames "\n")
 267                 ;; body
 268                 (if main-p
 269                     (org-babel-C-ensure-main-wrap body)
 270                   body) "\n") "\n")))
 271
 272 (defun org-babel-C-ensure-main-wrap (body)
 273   "Wrap BODY in a \"main\" function call if none exists."
 274   (if (string-match "^[ \t]*[intvod]+[ \t\n\r]*main[ \t]*(.*)" body)
 275       body
 276     (format "int main() {\n%s\nreturn 0;\n}\n" body)))
 277
 278 (defun org-babel-prep-session:C (_session _params)
 279   "This function does nothing as C is a compiled language with no
 280 support for sessions"
 281   (error "C is a compiled languages -- no support for sessions"))
 282
 283 (defun org-babel-load-session:C (_session _body _params)
 284   "This function does nothing as C is a compiled language with no
 285 support for sessions"
 286   (error "C is a compiled languages -- no support for sessions"))
 287
 288 ;; helper functions
 289
 290 (defun org-babel-C-format-val (type val)
 291   "Handle the FORMAT part of TYPE with the data from VAL."
 292   (let ((format-data (cadr type)))
 293     (if (stringp format-data)
 294         (cons "" (format format-data val))
 295       (funcall format-data val))))
 296
 297 (defun org-babel-C-val-to-C-type (val)
 298   "Determine the type of VAL.
 299 Return a list (TYPE-NAME FORMAT).  TYPE-NAME should be the name of the type.
 300 FORMAT can be either a format string or a function which is called with VAL."
 301   (let* ((basetype (org-babel-C-val-to-base-type val))
 302          (type
 303           (pcase basetype
 304             (`integerp '("int" "%d"))
 305             (`floatp '("double" "%f"))
 306             (`stringp
 307              (list
 308               (if (eq org-babel-c-variant 'd) "string" "const char*")
 309               "\"%s\""))
 310             (_ (error "unknown type %S" basetype)))))
 311     (cond
 312      ((integerp val) type) ;; an integer declared in the #+begin_src line
 313      ((floatp val) type) ;; a numeric declared in the #+begin_src line
 314      ((and (listp val) (listp (car val))) ;; a table
 315       `(,(car type)
 316         (lambda (val)
 317           (cons
 318            (format "[%d][%d]" (length val) (length (car val)))
 319            (concat
 320             (if (eq org-babel-c-variant 'd) "[\n" "{\n")
 321             (mapconcat
 322              (lambda (v)
 323                (concat
 324                 (if (eq org-babel-c-variant 'd) " [" " {")
 325                 (mapconcat (lambda (w) (format ,(cadr type) w)) v ",")
 326                 (if (eq org-babel-c-variant 'd) "]" "}")))
 327              val
 328              ",\n")
 329             (if (eq org-babel-c-variant 'd) "\n]" "\n}"))))))
 330      ((or (listp val) (vectorp val)) ;; a list declared in the #+begin_src line
 331       `(,(car type)
 332         (lambda (val)
 333           (cons
 334            (format "[%d]" (length val))
 335            (concat
 336             (if (eq org-babel-c-variant 'd) "[" "{")
 337             (mapconcat (lambda (v) (format ,(cadr type) v)) val ",")
 338             (if (eq org-babel-c-variant 'd) "]" "}"))))))
 339      (t ;; treat unknown types as string
 340       type))))
 341
 342 (defun org-babel-C-val-to-base-type (val)
 343   "Determine the base type of VAL which may be
 344 `integerp' if all base values are integers
 345 `floatp' if all base values are either floating points or integers
 346 `stringp' otherwise."
 347   (cond
 348    ((integerp val) 'integerp)
 349    ((floatp val) 'floatp)
 350    ((or (listp val) (vectorp val))
 351     (let ((type nil))
 352       (mapc (lambda (v)
 353               (pcase (org-babel-C-val-to-base-type v)
 354                 (`stringp (setq type 'stringp))
 355                 (`floatp
 356                  (if (or (not type) (eq type 'integerp))
 357                      (setq type 'floatp)))
 358                 (`integerp
 359                  (unless type (setq type 'integerp)))))
 360             val)
 361       type))
 362    (t 'stringp)))
 363
 364 (defun org-babel-C-var-to-C (pair)
 365   "Convert an elisp val into a string of C code specifying a var
 366 of the same value."
 367   ;; TODO list support
 368   (let ((var (car pair))
 369         (val (cdr pair)))
 370     (when (symbolp val)
 371       (setq val (symbol-name val))
 372       (when (= (length val) 1)
 373         (setq val (string-to-char val))))
 374     (let* ((type-data (org-babel-C-val-to-C-type val))
 375            (type (car type-data))
 376            (formated (org-babel-C-format-val type-data val))
 377            (suffix (car formated))
 378            (data (cdr formated)))
 379       (format "%s %s%s = %s;"
 380               type
 381               var
 382               suffix
 383               data))))
 384
 385 (defun org-babel-C-table-sizes-to-C (pair)
 386   "Create constants of table dimensions, if PAIR is a table."
 387   (when (listp (cdr pair))
 388     (cond
 389      ((listp (cadr pair)) ;; a table
 390       (concat
 391        (format "const int %s_rows = %d;" (car pair) (length (cdr pair)))
 392        "\n"
 393        (format "const int %s_cols = %d;" (car pair) (length (cadr pair)))))
 394      (t ;; a list declared in the #+begin_src line
 395       (format "const int %s_cols = %d;" (car pair) (length (cdr pair)))))))
 396
 397 (defun org-babel-C-utility-header-to-C ()
 398   "Generate a utility function to convert a column name
 399 into a column number."
 400   (pcase org-babel-c-variant
 401     ((or `c `cpp)
 402      "int get_column_num (int nbcols, const char** header, const char* column)
 403 {
 404   int c;
 405   for (c=0; c<nbcols; c++)
 406     if (strcmp(header[c],column)==0)
 407       return c;
 408   return -1;
 409 }
 410 ")
 411     (`d
 412      "int get_column_num (string[] header, string column)
 413 {
 414   foreach (c, h; header)
 415     if (h==column)
 416       return to!int(c);
 417   return -1;
 418 }
 419 ")))
 420
 421 (defun org-babel-C-header-to-C (head)
 422   "Convert an elisp list of header table into a C or D vector
 423 specifying a variable with the name of the table."
 424   (let ((table (car head))
 425         (headers (cdr head)))
 426     (concat
 427      (format
 428       (pcase org-babel-c-variant
 429         ((or `c `cpp) "const char* %s_header[%d] = {%s};")
 430         (`d "string %s_header[%d] = [%s];"))
 431       table
 432       (length headers)
 433       (mapconcat (lambda (h) (format "%S" h)) headers ","))
 434      "\n"
 435      (pcase org-babel-c-variant
 436        ((or `c `cpp)
 437         (format
 438          "const char* %s_h (int row, const char* col) { return %s[row][get_column_num(%d,%s_header,col)]; }"
 439          table table (length headers) table))
 440        (`d
 441         (format
 442          "string %s_h (size_t row, string col) { return %s[row][get_column_num(%s_header,col)]; }"
 443          table table table))))))
 444
 445 (provide 'ob-C)
 446
 447 ;;; ob-C.el ends here