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;;; ob-perl.el --- org-babel functions for perl evaluation
;; Copyright (C) 2009-2012 Free Software Foundation, Inc.
;; Authors: Dan Davison
;; 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 perl source code.
;;; Code:
(require 'ob)
(require 'ob-eval)
(eval-when-compile (require 'cl))
(defvar org-babel-tangle-lang-exts)
(add-to-list 'org-babel-tangle-lang-exts '("perl" . "pl"))
(defvar org-babel-default-header-args:perl '())
(defvar org-babel-perl-command "perl"
"Name of command to use for executing perl code.")
(defun org-babel-execute:perl (body params)
"Execute a block of Perl code with Babel.
This function is called by `org-babel-execute-src-block'."
(let* ((session (cdr (assoc :session params)))
(result-params (cdr (assoc :result-params params)))
(result-type (cdr (assoc :result-type params)))
(full-body (org-babel-expand-body:generic
body params (org-babel-variable-assignments:perl params)))
(session (org-babel-perl-initiate-session session)))
(org-babel-reassemble-table
(org-babel-perl-evaluate session full-body result-type)
(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-prep-session:perl (session params)
"Prepare SESSION according to the header arguments in PARAMS."
(error "Sessions are not supported for Perl"))
(defun org-babel-variable-assignments:perl (params)
"Return list of perl statements assigning the block's variables."
(mapcar
(lambda (pair)
(format "$%s=%s;"
(car pair)
(org-babel-perl-var-to-perl (cdr pair))))
(mapcar #'cdr (org-babel-get-header params :var))))
;; helper functions
(defun org-babel-perl-var-to-perl (var)
"Convert an elisp value to a perl variable.
The elisp value, VAR, is converted to a string of perl source code
specifying a var of the same value."
(if (listp var)
(concat "[" (mapconcat #'org-babel-perl-var-to-perl var ", ") "]")
(format "%S" var)))
(defvar org-babel-perl-buffers '(:default . nil))
(defun org-babel-perl-initiate-session (&optional session params)
"Return nil because sessions are not supported by perl."
nil)
(defvar org-babel-perl-wrapper-method
"
sub main {
%s
}
@r = main;
open(o, \">%s\");
print o join(\"\\n\", @r), \"\\n\"")
(defvar org-babel-perl-pp-wrapper-method
nil)
(defun org-babel-perl-evaluate (session body &optional result-type)
"Pass BODY to the Perl process in SESSION.
If RESULT-TYPE equals 'output then return a list of the outputs
of the statements in BODY, if RESULT-TYPE equals 'value then
return the value of the last statement in BODY, as elisp."
(when session (error "Sessions are not supported for Perl"))
(case result-type
(output (org-babel-eval org-babel-perl-command body))
(value (let ((tmp-file (org-babel-temp-file "perl-")))
(org-babel-eval
org-babel-perl-command
(format org-babel-perl-wrapper-method body
(org-babel-process-file-name tmp-file 'noquote)))
(org-babel-eval-read-file tmp-file)))))
(provide 'ob-perl)
;;; ob-perl.el ends here
|
