diff options
Diffstat (limited to 'lisp/ob-processing.el')
| -rw-r--r-- | lisp/ob-processing.el | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/lisp/ob-processing.el b/lisp/ob-processing.el new file mode 100644 index 0000000..d983afe --- /dev/null +++ b/lisp/ob-processing.el @@ -0,0 +1,197 @@ +;;; ob-processing.el --- Babel functions for evaluation of processing + +;; Copyright (C) 2015 Free Software Foundation, Inc. + +;; Author: Jarmo Hurri (adapted from ob-asymptote.el written by 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: + +;; Babel support for evaluating processing source code. +;; +;; This differs from most standard languages in that +;; +;; 1) there is no such thing as a "session" in processing +;; +;; 2) results can only be exported as html; in this case, the +;; processing code is embedded via a file into a javascript block +;; using the processing.js module; the script then draws the +;; resulting output when the web page is viewed in a browser; note +;; that the user is responsible for making sure that processing.js +;; is available on the website +;; +;; 3) it is possible to interactively view the sketch of the +;; Processing code block via Processing 2.0 Emacs mode, using +;; `org-babel-processing-view-sketch'. You can bind this command +;; to, e.g., C-c C-v C-k with +;; +;; (define-key org-babel-map (kbd "C-k") 'org-babel-processing-view-sketch) + + +;;; Requirements: + +;; - processing2-emacs mode :: https://github.com/ptrv/processing2-emacs +;; - Processing.js module :: http://processingjs.org/ + +;;; Code: +(require 'ob) +(require 'sha1) +(eval-when-compile (require 'cl)) + +(declare-function processing-sketch-run "ext:processing-mode" ()) + +(defvar org-babel-temporary-directory) + +(defvar org-babel-tangle-lang-exts) +(add-to-list 'org-babel-tangle-lang-exts '("processing" . "pde")) + +;; Default header tags depend on whether exporting html or not; if not +;; exporting html, then no results are produced; otherwise results are +;; HTML. +(defvar org-babel-default-header-args:processing + '((:results . "html") (:exports . "results")) + "Default arguments when evaluating a Processing source block.") + +(defvar org-babel-processing-processing-js-filename "processing.js" + "Filename of the processing.js file.") + +(defun org-babel-processing-view-sketch () + "Show the sketch of the Processing block under point in an external viewer." + (interactive) + (require 'processing-mode) + (let ((info (org-babel-get-src-block-info))) + (if (string= (nth 0 info) "processing") + (let* ((body (nth 1 info)) + (params (org-babel-process-params (nth 2 info))) + (sketch-code + (org-babel-expand-body:generic + body + params + (org-babel-variable-assignments:processing params)))) + ;; Note: sketch filename can not contain a hyphen, since it + ;; has to be a valid java class name; for this reason + ;; make-temp-file is repeated until no hyphen is in the + ;; name; also sketch dir name must be the same as the + ;; basename of the sketch file. + (let* ((temporary-file-directory org-babel-temporary-directory) + (sketch-dir + (let (sketch-dir-candidate) + (while + (progn + (setq sketch-dir-candidate + (make-temp-file "processing" t)) + (when (org-string-match-p + "-" + (file-name-nondirectory sketch-dir-candidate)) + (delete-directory sketch-dir-candidate) + t))) + sketch-dir-candidate)) + (sketch-filename + (concat sketch-dir + "/" + (file-name-nondirectory sketch-dir) + ".pde"))) + (with-temp-file sketch-filename (insert sketch-code)) + (find-file sketch-filename) + (processing-sketch-run) + (kill-buffer))) + (message "Not inside a Processing source block.")))) + +(defun org-babel-execute:processing (body params) + "Execute a block of Processing code. +This function is called by `org-babel-execute-src-block'." + (let ((sketch-code + (org-babel-expand-body:generic + body + params + (org-babel-variable-assignments:processing params)))) + ;; Results are HTML. + (let ((sketch-canvas-id (concat "ob-" (sha1 sketch-code)))) + (concat "<script src=\"" + org-babel-processing-processing-js-filename + "\"></script>\n <script type=\"text/processing\"" + " data-processing-target=\"" + sketch-canvas-id + "\">\n" + sketch-code + "\n</script> <canvas id=\"" + sketch-canvas-id + "\"></canvas>")))) + +(defun org-babel-prep-session:processing (session params) + "Return an error if the :session header argument is set. +Processing does not support sessions" + (error "Processing does not support sessions")) + +(defun org-babel-variable-assignments:processing (params) + "Return list of processing statements assigning the block's variables." + (mapcar #'org-babel-processing-var-to-processing + (mapcar #'cdr (org-babel-get-header params :var)))) + +(defun org-babel-processing-var-to-processing (pair) + "Convert an elisp value into a Processing variable. +The elisp value PAIR is converted into Processing code specifying +a variable of the same value." + (let ((var (car pair)) + (val (let ((v (cdr pair))) + (if (symbolp v) (symbol-name v) v)))) + (cond + ((integerp val) + (format "int %S=%S;" var val)) + ((floatp val) + (format "float %S=%S;" var val)) + ((stringp val) + (format "String %S=\"%s\";" var val)) + ((and (listp val) (not (listp (car val)))) + (let* ((type (org-babel-processing-define-type val)) + (fmt (if (eq 'String type) "\"%s\"" "%s")) + (vect (mapconcat (lambda (e) (format fmt e)) val ", "))) + (format "%s[] %S={%s};" type var vect))) + ((listp val) + (let* ((type (org-babel-processing-define-type val)) + (fmt (if (eq 'String type) "\"%s\"" "%s")) + (array (mapconcat (lambda (row) + (concat "{" + (mapconcat (lambda (e) (format fmt e)) + row ", ") + "}")) + val ","))) + (format "%S[][] %S={%s};" type var array)))))) + +(defun org-babel-processing-define-type (data) + "Determine type of DATA. + +DATA is a list. Return type as a symbol. + +The type is `String' if any element in DATA is +a string. Otherwise, it is either `float', if some elements are +floats, or `int'." + (let* ((type 'int) + find-type ; For byte-compiler. + (find-type + (lambda (row) + (dolist (e row type) + (cond ((listp e) (setq type (funcall find-type e))) + ((stringp e) (throw 'exit 'String)) + ((floatp e) (setq type 'float))))))) + (catch 'exit (funcall find-type data)))) + +(provide 'ob-processing) + +;;; ob-processing.el ends here |