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|
;;; ob-perl.el --- Babel Functions for Perl -*- lexical-binding: t; -*-
;; Copyright (C) 2009-2019 Free Software Foundation, Inc.
;; Authors: Dan Davison
;; Eric Schulte
;; Keywords: literate programming, reproducible research
;; Homepage: https://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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Org-Babel support for evaluating perl source code.
;;; Code:
(require 'ob)
(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 (assq :session params)))
(result-params (cdr (assq :result-params params)))
(result-type (cdr (assq :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 result-params)
(org-babel-pick-name
(cdr (assq :colname-names params)) (cdr (assq :colnames params)))
(org-babel-pick-name
(cdr (assq :rowname-names params)) (cdr (assq :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)
(org-babel-perl--var-to-perl (cdr pair) (car pair)))
(org-babel--get-vars params)))
;; helper functions
(defvar org-babel-perl-var-wrap "q(%s)"
"Wrapper for variables inserted into Perl code.")
(defvar org-babel-perl--lvl)
(defun org-babel-perl--var-to-perl (var &optional varn)
"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 varn
(let ((org-babel-perl--lvl 0) (lvar (listp var)))
(concat "my $" (symbol-name varn) "=" (when lvar "\n")
(org-babel-perl--var-to-perl var)
";\n"))
(let ((prefix (make-string (* 2 org-babel-perl--lvl) ?\ )))
(concat prefix
(if (listp var)
(let ((org-babel-perl--lvl (1+ org-babel-perl--lvl)))
(concat "[\n"
(mapconcat #'org-babel-perl--var-to-perl var "")
prefix "]"))
(format "q(%s)" var))
(unless (zerop org-babel-perl--lvl) ",\n")))))
(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 "{
my $babel_sub = sub {
%s
};
open my $BOH, qq(>%s) or die qq(Perl: Could not open output file.$/);
my $rv = &$babel_sub();
my $rt = ref $rv;
select $BOH;
if (qq(ARRAY) eq $rt) {
local $\\=$/;
local $,=qq(\t);
foreach my $rv ( @$rv ) {
my $rt = ref $rv;
if (qq(ARRAY) eq $rt) {
print @$rv;
} else {
print $rv;
}
}
} else {
print $rv;
}
}")
(defvar org-babel-perl-preface nil)
(defvar org-babel-perl-pp-wrapper-method
nil)
(defun org-babel-perl-evaluate (session ibody &optional result-type result-params)
"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"))
(let* ((body (concat org-babel-perl-preface ibody))
(tmp-file (org-babel-temp-file "perl-"))
(tmp-babel-file (org-babel-process-file-name
tmp-file 'noquote)))
(let ((results
(pcase result-type
(`output
(with-temp-file tmp-file
(insert
(org-babel-eval org-babel-perl-command body))
(buffer-string)))
(`value
(org-babel-eval org-babel-perl-command
(format org-babel-perl-wrapper-method
body tmp-babel-file))))))
(when results
(org-babel-result-cond result-params
(org-babel-eval-read-file tmp-file)
(org-babel-import-elisp-from-file tmp-file '(16)))))))
(provide 'ob-perl)
;;; ob-perl.el ends here
|
