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;;; ob-C.el --- org-babel functions for C and similar languages
;; Copyright (C) 2010-2017 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:
(eval-when-compile
(require 'cl))
(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 language -- 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 language -- 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
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