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+;;; ob-java.el --- org-babel functions for java evaluation -*- lexical-binding: t -*-
+
+;; Copyright (C) 2011-2021 Free Software Foundation, Inc.
+
+;; Authors: Eric Schulte
+;; Dan Davison
+;; Maintainer: Ian Martins <ianxm@jhu.edu>
+;; 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 java source code.
+
+;;; Code:
+(require 'ob)
+
+(defvar org-babel-tangle-lang-exts)
+(add-to-list 'org-babel-tangle-lang-exts '("java" . "java"))
+
+(defvar org-babel-temporary-directory) ; from ob-core
+
+(defvar org-babel-default-header-args:java '((:results . "output")
+ (:dir . "."))
+ "Default header args for java source blocks.
+The docs say functional mode should be the default [1], but
+ob-java didn't originally support functional mode, so we keep
+scripting mode as the default for now to maintain previous
+behavior.
+
+Most languages write tempfiles to babel's temporary directory,
+but ob-java originally had to write them to the current
+directory, so we keep that as the default behavior.
+
+[1] https://orgmode.org/manual/Results-of-Evaluation.html")
+
+(defconst org-babel-header-args:java '((imports . :any))
+ "Java-specific header arguments.")
+
+(defcustom org-babel-java-command "java"
+ "Name of the java command.
+May be either a command in the path, like java or an absolute
+path name, like /usr/local/bin/java. Parameters may be used,
+like java -verbose."
+ :group 'org-babel
+ :package-version '(Org . "9.5")
+ :type 'string)
+
+(defcustom org-babel-java-compiler "javac"
+ "Name of the java compiler.
+May be either a command in the path, like javac or an absolute
+path name, like /usr/local/bin/javac. Parameters may be used,
+like javac -verbose."
+ :group 'org-babel
+ :package-version '(Org . "9.5")
+ :type 'string)
+
+(defcustom org-babel-java-hline-to "null"
+ "Replace hlines in incoming tables with this when translating to java."
+ :group 'org-babel
+ :package-version '(Org . "9.5")
+ :type 'string)
+
+(defcustom org-babel-java-null-to 'hline
+ "Replace `null' in java tables with this before returning."
+ :group 'org-babel
+ :package-version '(Org . "9.5")
+ :type 'symbol)
+
+(defconst org-babel-java--package-re (rx line-start (0+ space) "package"
+ (1+ space) (group (1+ (in alnum ?_ ?.))) ; capture the package name
+ (0+ space) ?\; line-end)
+ "Regexp for the package statement.")
+(defconst org-babel-java--imports-re (rx line-start (0+ space) "import"
+ (opt (1+ space) "static")
+ (1+ space) (group (1+ (in alnum ?_ ?. ?*))) ; capture the fully qualified class name
+ (0+ space) ?\; line-end)
+ "Regexp for import statements.")
+(defconst org-babel-java--class-re (rx line-start (0+ space) (opt (seq "public" (1+ space)))
+ "class" (1+ space)
+ (group (1+ (in alnum ?_))) ; capture the class name
+ (0+ space) ?{)
+ "Regexp for the class declaration.")
+(defconst org-babel-java--main-re
+ (rx line-start (0+ space) "public"
+ (1+ space) "static"
+ (1+ space) "void"
+ (1+ space) "main"
+ (0+ space) ?\(
+ (0+ space) "String"
+ (1+ (in alnum ?_ ?\[ ?\] space)) ; "[] args" or "args[]"
+ ?\)
+ (0+ space) (opt "throws" (1+ (in alnum ?_ ?, ?. space)))
+ ?{)
+ "Regexp for the main method declaration.")
+(defconst org-babel-java--any-method-re
+ (rx line-start
+ (0+ space) (opt (seq (1+ alnum) (1+ space))) ; visibility
+ (opt (seq "static" (1+ space))) ; binding
+ (1+ (in alnum ?_ ?\[ ?\])) ; return type
+ (1+ space) (1+ (in alnum ?_)) ; method name
+ (0+ space) ?\(
+ (0+ (in alnum ?_ ?\[ ?\] ?, space)) ; params
+ ?\)
+ (0+ space) (opt "throws" (1+ (in alnum ?_ ?, ?. space)))
+ ?{)
+ "Regexp for any method.")
+(defconst org-babel-java--result-wrapper "\n public static String __toString(Object val) {
+ if (val instanceof String) {
+ return \"\\\"\" + val + \"\\\"\";
+ } else if (val == null) {
+ return \"null\";
+ } else if (val.getClass().isArray()) {
+ StringBuffer sb = new StringBuffer();
+ Object[] vals = (Object[])val;
+ sb.append(\"[\");
+ for (int ii=0; ii<vals.length; ii++) {
+ sb.append(__toString(vals[ii]));
+ if (ii<vals.length-1)
+ sb.append(\",\");
+ }
+ sb.append(\"]\");
+ return sb.toString();
+ } else if (val instanceof List) {
+ StringBuffer sb = new StringBuffer();
+ List vals = (List)val;
+ sb.append(\"[\");
+ for (int ii=0; ii<vals.size(); ii++) {
+ sb.append(__toString(vals.get(ii)));
+ if (ii<vals.size()-1)
+ sb.append(\",\");
+ }
+ sb.append(\"]\");
+ return sb.toString();
+ } else {
+ return String.valueOf(val);
+ }
+ }
+
+ public static void main(String[] args) throws IOException {
+ BufferedWriter output = new BufferedWriter(new FileWriter(\"%s\"));
+ output.write(__toString(_main(args)));
+ output.close();
+ }"
+ "Code to inject into a class so that we can capture the value it returns.
+This implementation was inspired by ob-python, although not as
+elegant. This modified the source block to write out the value
+it wants to return to a temporary file so that ob-java can read
+it back. The name of the temporary file to write must be
+replaced in this string.")
+
+(defun org-babel-execute:java (body params)
+ "Execute a java source block with BODY code and PARAMS params."
+ (let* (;; allow header overrides
+ (org-babel-java-compiler
+ (or (cdr (assq :javac params))
+ org-babel-java-compiler))
+ (org-babel-java-command
+ (or (cdr (assq :java params))
+ org-babel-java-command))
+ ;; if true, run from babel temp directory
+ (run-from-temp (not (cdr (assq :dir params))))
+ ;; class and package
+ (fullclassname (or (cdr (assq :classname params))
+ (org-babel-java-find-classname body)))
+ ;; just the class name
+ (classname (car (last (split-string fullclassname "\\."))))
+ ;; just the package name
+ (packagename (if (string-match-p "\\." fullclassname)
+ (file-name-base fullclassname)))
+ ;; the base dir that contains the top level package dir
+ (basedir (file-name-as-directory (if run-from-temp
+ (if (file-remote-p default-directory)
+ (concat
+ (file-remote-p default-directory)
+ org-babel-remote-temporary-directory)
+ org-babel-temporary-directory)
+ default-directory)))
+ ;; the dir to write the source file
+ (packagedir (if (and (not run-from-temp) packagename)
+ (file-name-as-directory
+ (concat basedir (replace-regexp-in-string "\\." "/" packagename)))
+ basedir))
+ ;; the filename of the source file
+ (src-file (concat packagedir classname ".java"))
+ ;; compiler flags
+ (cmpflag (or (cdr (assq :cmpflag params)) ""))
+ ;; runtime flags
+ (cmdline (or (cdr (assq :cmdline params)) ""))
+ ;; command line args
+ (cmdargs (or (cdr (assq :cmdargs params)) ""))
+ ;; the command to compile and run
+ (cmd (concat org-babel-java-compiler " " cmpflag " "
+ (org-babel-process-file-name src-file 'noquote)
+ " && " org-babel-java-command
+ " -cp " (org-babel-process-file-name basedir 'noquote)
+ " " cmdline " " (if run-from-temp classname fullclassname)
+ " " cmdargs))
+ ;; header args for result processing
+ (result-type (cdr (assq :result-type params)))
+ (result-params (cdr (assq :result-params params)))
+ (result-file (and (eq result-type 'value)
+ (org-babel-temp-file "java-")))
+ ;; the expanded body of the source block
+ (full-body (org-babel-expand-body:java body params)))
+
+ ;; created package-name directories if missing
+ (unless (or (not packagedir) (file-exists-p packagedir))
+ (make-directory packagedir 'parents))
+
+ ;; write the source file
+ (setq full-body (org-babel-java--expand-for-evaluation
+ full-body run-from-temp result-type result-file))
+ (with-temp-file src-file (insert full-body))
+
+ ;; compile, run, process result
+ (org-babel-reassemble-table
+ (org-babel-java-evaluate cmd result-type result-params result-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))))))
+
+;; helper functions
+
+(defun org-babel-java-find-classname (body)
+ "Try to find fully qualified class name in BODY.
+Look through BODY for the package and class. If found, put them
+together into a fully qualified class name and return. Else just
+return class name. If that isn't found either, default to Main."
+ (let ((package (if (string-match org-babel-java--package-re body)
+ (match-string 1 body)))
+ (class (if (string-match org-babel-java--class-re body)
+ (match-string 1 body))))
+ (or (and package class (concat package "." class))
+ (and class class)
+ (and package (concat package ".Main"))
+ "Main")))
+
+(defun org-babel-java--expand-for-evaluation (body suppress-package-p result-type result-file)
+ "Expand source block for evaluation.
+In order to return a value we have to add a __toString method.
+In order to prevent classes without main methods from erroring we
+add a dummy main method if one is not provided. These
+manipulations are done outside of `org-babel--expand-body' so
+that they are hidden from tangles.
+
+BODY is the file content before instrumentation.
+
+SUPPRESS-PACKAGE-P if true, suppress the package statement.
+
+RESULT-TYPE is taken from params.
+
+RESULT-FILE is the temp file to write the result."
+ (with-temp-buffer
+ (insert body)
+
+ ;; suppress package statement
+ (goto-char (point-min))
+ (when (and suppress-package-p
+ (re-search-forward org-babel-java--package-re nil t))
+ (replace-match ""))
+
+ ;; add a dummy main method if needed
+ (goto-char (point-min))
+ (when (not (re-search-forward org-babel-java--main-re nil t))
+ (org-babel-java--move-past org-babel-java--class-re)
+ (insert "\n public static void main(String[] args) {
+ System.out.print(\"success\");
+ }\n\n"))
+
+ ;; special handling to return value
+ (when (eq result-type 'value)
+ (goto-char (point-min))
+ (org-babel-java--move-past org-babel-java--class-re)
+ (insert (format org-babel-java--result-wrapper
+ (org-babel-process-file-name result-file 'noquote)))
+ (search-forward "public static void main(") ; rename existing main
+ (replace-match "public static Object _main("))
+
+ ;; add imports
+ (org-babel-java--import-maybe "java.util" "List")
+ (org-babel-java--import-maybe "java.util" "Arrays")
+ (org-babel-java--import-maybe "java.io" "BufferedWriter")
+ (org-babel-java--import-maybe "java.io" "FileWriter")
+ (org-babel-java--import-maybe "java.io" "IOException")
+
+ (buffer-string)))
+
+(defun org-babel-java--move-past (re)
+ "Move point past the first occurrence of the given regexp RE."
+ (while (re-search-forward re nil t)
+ (goto-char (1+ (match-end 0)))))
+
+(defun org-babel-java--import-maybe (package class)
+ "Import from PACKAGE the given CLASS if it is used and not already imported."
+ (let (class-found import-found)
+ (goto-char (point-min))
+ (setq class-found (re-search-forward class nil t))
+ (goto-char (point-min))
+ (setq import-found
+ (re-search-forward (concat "^import .*" package ".*\\(?:\\*\\|" class "\\);") nil t))
+ (when (and class-found (not import-found))
+ (org-babel-java--move-past org-babel-java--package-re)
+ (insert (concat "import " package "." class ";\n")))))
+
+(defun org-babel-expand-body:java (body params)
+ "Expand BODY with PARAMS.
+BODY could be a few statements, or could include a full class
+definition specifying package, imports, and class. Because we
+allow this flexibility in what the source block can contain, it
+is simplest to expand the code block from the inside out."
+ (let* ((fullclassname (or (cdr (assq :classname params)) ; class and package
+ (org-babel-java-find-classname body)))
+ (classname (car (last (split-string fullclassname "\\.")))) ; just class name
+ (packagename (if (string-match-p "\\." fullclassname) ; just package name
+ (file-name-base fullclassname)))
+ (var-lines (org-babel-variable-assignments:java params))
+ (imports-val (assq :imports params))
+ (imports (if imports-val
+ (split-string (org-babel-read (cdr imports-val) nil) " ")
+ nil)))
+ (with-temp-buffer
+ (insert body)
+
+ ;; wrap main. If there are methods defined, but no main method
+ ;; and no class, wrap everything in a generic main method.
+ (goto-char (point-min))
+ (when (and (not (re-search-forward org-babel-java--main-re nil t))
+ (not (re-search-forward org-babel-java--any-method-re nil t)))
+ (org-babel-java--move-past org-babel-java--package-re) ; if package is defined, move past it
+ (org-babel-java--move-past org-babel-java--imports-re) ; if imports are defined, move past them
+ (insert "public static void main(String[] args) {\n")
+ (indent-code-rigidly (point) (point-max) 4)
+ (goto-char (point-max))
+ (insert "\n}"))
+
+ ;; wrap class. If there's no class, wrap everything in a
+ ;; generic class.
+ (goto-char (point-min))
+ (when (not (re-search-forward org-babel-java--class-re nil t))
+ (org-babel-java--move-past org-babel-java--package-re) ; if package is defined, move past it
+ (org-babel-java--move-past org-babel-java--imports-re) ; if imports are defined, move past them
+ (insert (concat "\npublic class " (file-name-base classname) " {\n"))
+ (indent-code-rigidly (point) (point-max) 4)
+ (goto-char (point-max))
+ (insert "\n}"))
+ (goto-char (point-min))
+
+ ;; insert variables from source block headers
+ (when var-lines
+ (goto-char (point-min))
+ (org-babel-java--move-past org-babel-java--class-re) ; move inside class
+ (insert (mapconcat 'identity var-lines "\n"))
+ (insert "\n"))
+
+ ;; add imports from source block headers
+ (when imports
+ (goto-char (point-min))
+ (org-babel-java--move-past org-babel-java--package-re) ; if package is defined, move past it
+ (insert (mapconcat (lambda (package) (concat "import " package ";")) imports "\n") "\n"))
+
+ ;; add package at the top
+ (goto-char (point-min))
+ (when (and packagename (not (re-search-forward org-babel-java--package-re nil t)))
+ (insert (concat "package " packagename ";\n")))
+
+ ;; return expanded body
+ (buffer-string))))
+
+(defun org-babel-variable-assignments:java (params)
+ "Return a list of java statements assigning the block's variables.
+variables are contained in PARAMS."
+ (mapcar
+ (lambda (pair)
+ (let* ((type-data (org-babel-java-val-to-type (cdr pair)))
+ (basetype (car type-data))
+ (var-to-java (lambda (var) (funcall #'org-babel-java-var-to-java var basetype))))
+ (format " static %s %s = %s;"
+ (cdr type-data) ; type
+ (car pair) ; name
+ (funcall var-to-java (cdr pair))))) ; value
+ (org-babel--get-vars params)))
+
+(defun org-babel-java-var-to-java (var basetype)
+ "Convert an elisp value to a java variable.
+Convert an elisp value, VAR, of type BASETYPE into a string of
+java source code specifying a variable of the same value."
+ (cond ((and (sequencep var) (not (stringp var)))
+ (let ((var-to-java (lambda (var) (funcall #'org-babel-java-var-to-java var basetype))))
+ (concat "Arrays.asList(" (mapconcat var-to-java var ", ") ")")))
+ ((eq var 'hline) org-babel-java-hline-to)
+ ((eq basetype 'integerp) (format "%d" var))
+ ((eq basetype 'floatp) (format "%f" var))
+ ((eq basetype 'stringp) (if (and (stringp var) (string-match-p ".\n+." var))
+ (error "Java does not support multiline string literals")
+ (format "\"%s\"" var)))))
+
+(defun org-babel-java-val-to-type (val)
+ "Determine the type of VAL.
+Return (BASETYPE . LISTTYPE), where BASETYPE is a symbol
+representing the type of the individual items in VAL, and
+LISTTYPE is a string name of the type parameter for a container
+for BASETYPE items."
+ (let* ((basetype (org-babel-java-val-to-base-type val))
+ (basetype-str (pcase basetype
+ (`integerp "Integer")
+ (`floatp "Double")
+ (`stringp "String")
+ (_ (error "Unknown type %S" basetype)))))
+ (cond
+ ((and (listp val) (listp (car val))) ; a table
+ (cons basetype (format "List<List<%s>>" basetype-str)))
+ ((or (listp val) (vectorp val)) ; a list declared in the source block header
+ (cons basetype (format "List<%s>" basetype-str)))
+ (t ; return base type
+ (cons basetype basetype-str)))))
+
+(defun org-babel-java-val-to-base-type (val)
+ "Determine the base type of VAL.
+VAL may be
+`integerp' if all base values are integers
+`floatp' if all base values are either floating points or integers
+`stringp' otherwise."
+ (cond
+ ((integerp val) 'integerp)
+ ((floatp val) 'floatp)
+ ((or (listp val) (vectorp val))
+ (let ((type nil))
+ (mapc (lambda (v)
+ (pcase (org-babel-java-val-to-base-type v)
+ (`stringp (setq type 'stringp))
+ (`floatp
+ (when (or (not type) (eq type 'integerp))
+ (setq type 'floatp)))
+ (`integerp
+ (unless type (setq type 'integerp)))))
+ val)
+ type))
+ (t 'stringp)))
+
+(defun org-babel-java-table-or-string (results)
+ "Convert RESULTS into an appropriate elisp value.
+If the results look like a list or vector, then convert them into an
+Emacs-lisp table, otherwise return the results as a string."
+ (let ((res (org-babel-script-escape results)))
+ (if (listp res)
+ (mapcar (lambda (el) (if (eq 'null el)
+ org-babel-java-null-to
+ el))
+ res)
+ res)))
+
+(defun org-babel-java-evaluate (cmd result-type result-params result-file)
+ "Evaluate using an external java process.
+CMD the command to execute.
+
+If RESULT-TYPE equals `output' then return standard output as a
+string. If RESULT-TYPE equals `value' then return the value
+returned by the source block, as elisp.
+
+RESULT-PARAMS input params used to format the response.
+
+RESULT-FILE filename of the tempfile to store the returned value in
+for `value' RESULT-TYPE. Not used for `output' RESULT-TYPE."
+ (let ((raw (pcase result-type
+ (`output (org-babel-eval cmd ""))
+ (`value (org-babel-eval cmd "")
+ (org-babel-eval-read-file result-file)))))
+ (org-babel-result-cond result-params raw
+ (org-babel-java-table-or-string raw))))
+
+(provide 'ob-java)
+
+;;; ob-java.el ends here
generated by cgit v1.2.1 (git 2.18.0) at 2024-09-19 23:58:34 +0000